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    Wyświetlanie 1-23 z 23
    Tytuł:
    The Jurassic-Cretaceous boundary in Boreal Russia : radiolarian and calcareous dinoflagellate potential biomarkers
    Autorzy:
    Vishnevskaya, V. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060606.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Tithonian stages
    Berriasian stages
    radiolarians
    calcareous dinoflagellates
    Tethys
    boreal
    Volgian
    Opis:
    The International Berriasian Working Group (ISCS) suggested primary and secondary marker “datums” to fix the basal Berriasian boundary and thus to detine the Jurassic-Cretaceous boundary (Wimbledon et al., 2011, 2013). Two primary markers Calpionella, as well as calcareous nannoplankton, are practically unknown in the Boreal Realm. Testing and calibration of these markers, as well as of fossils of radiolarians and other signals, in the most complete sections, were declared as an important task for the near future. In the Tethys, the Jurassic-Cretaceous boundary based on radiolarians falls inside zone UAZ 13 of Baumgartner et al. (1995), whereas in the palaeo-Pacific it corresponds to the boundary between zones 4 and 5 of Pessagno et al. (2009), and in boreal Siberia it probably falls between the biohorizons of Parvicingula haeckeli and P. khabakovi. The radiolarian events at the Jurassic-Cretaceous boundary in the boreal successions of Russia can be proposed to be used as an additional biomarker to help develop new integrated boundary criteria. Thus, as the first appearance of the zonal species Calpionella alpina, which defines the Jurassic and Cretaceous boundary, coincides with the first occurrence of the calcareous dinocyst zonal species Stomiosphaerina proxima (Reháková, 2000), it is logical to propose a calcareous dinoflagellate, widely represented in the Upper Jurassic-Lower Cretaceous Bazhenovo Formation of Siberia, as a secondary marker.
    Źródło:
    Geological Quarterly; 2017, 61, 3; 641--654
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The succession of ammonites of the genus Amoeboceras in the Upper Oxfordian – Kimmeridgian of the Nordvik section in northern Siberia
    Autorzy:
    Rogov, M.
    Wierzbowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061366.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ammonites
    Jurassic
    Oxfordian
    Kimmeridgian
    biostratigraphy
    Boreal Province
    correlation
    paleobiogeography
    Opis:
    A collection of ammonites of the genus Amoeboceras located carefully in the section of Nordvik Peninsula in northern Siberia has enabled recognition of the standard Boreal ammonite zones of the Upper Oxfordian and Kimmeridgian. The recognition of the standard Amoeboceras zones, well known in NW Europe and the Barents Sea area, in northern Siberia indicates the uniform character of the Late Oxfordian and Kimmeridgian ammonite faunas across the whole Boreal Province. Some comments on the occurrence of Boreal oppeliids of the genus Suboxydiscites in the studied section are also given.
    Źródło:
    Volumina Jurassica; 2009, 7, 1; 147-156
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Borealny Bolków. Nowe badania obozowisk mezolitycznych nad jeziorem Świdwie
    Autorzy:
    Galiński, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1023955.pdf
    Data publikacji:
    2015-01-01
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Boreal
    Mesolithic
    Bolków
    Polska
    camps
    Maglemose culture
    flint tools
    bone harpoons
    Opis:
    New research of the Mesolithic camps in Bolków on Świdwie lake provided rich archaeological evidence, including that related to the oldest settlement of the Maglemose culture. The assemblages appeared in Świdwie lake area around 8800/8700 BP and they suggest connection with western Jutland.
    Źródło:
    Folia Praehistorica Posnaniensia; 2015, 20; 127-151
    0239-8524
    2450-5846
    Pojawia się w:
    Folia Praehistorica Posnaniensia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of forest clear cuts on plant–pollinator interactions: the case of three ericaceous subshrubs in Lithuanian pine forests
    Wpływ zrębów zupełnych na interakcje roślina–zapylacz: przypadek trzech krzewinek z rodziny wrzosowatych w litewskich borach sosnowych
    Autorzy:
    Daubaras, Remigijus
    Cesoniene, Laima
    Zych, Marcin
    Tamutis, Vytautas
    Stakėnas, Vidas
    Powiązania:
    https://bibliotekanauki.pl/articles/1631308.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    biodiversity
    boreal forest
    Calluna
    Ericaceae
    forest management
    Pinus
    sylvestris
    pollination
    Vaccinium
    Opis:
    Managed boreal pine forests are subject to regular clear cuts causing significant disturbances to these ecosystems. It is believed that, to some extent, they resemble natural cycles of forest growth, decline, and regeneration and can benefit, e.g., mutualistic relations among plants and pollinators. To study the impact of forest management (clear cuts) on pollinator visitation, we focused on three ericaceous plant species, Vaccinium myrtillus, V. vitis-idaea, and Calluna vulgaris, common elements of pine forest understory. Our observations, conducted in Lithuania, showed that there are no differences among control mature stands and clear cut areas in terms of visitation frequency for all three studied species. However, at least for C. vulgaris, a shift toward fly visits was observed in the clear cut site, showing that open areas are preferred habitats for these insects. Ants constituted an important share of visitors to flowers of V. myrtillus and C. vulgaris, suggesting their important role in reproduction of these plant species.
    Gospodarcze drzewostany sosnowe strefy borealnej są obiektem częstych zabiegów leśnych, m.in. zrębów zupełnych, powodujących znaczące zaburzenia w tych ekosystemach. Sądzi się, że do pewnego stopnia zabiegi takie przypominają naturalne cykle wzrostu, rozpadu i regeneracji lasu i mogą pozytywnie wpływać na przykład na mutualistyczne związki pomiędzy roślinami i ich zapylaczami. Aby zbadać wpływ gospodarki leśnej (zrębów zupełnych) na odwiedziny zapylaczy skupiliśmy się na trzech gatunkach krzewinek z rodziny wrzosowatych: Vaccinium myrtillus, V. vitis-idaea i Calluna vulgaris, będących częstymi składnikami runa borów sosnowych. Nasze obserwacje, prowadzone na Litwie, generalnie nie wykazały istotnych różnic w zakresie częstości wizyt owadów na kwiatach trzech badanych gatunków roślin w obu siedliskach: dojrzałym lesie i zrębach. W przypadku C. vulgaris na siedlisku zrębowym zanotowano jednak wzrost liczebności muchówek, co może wskazywać na preferencje tych owadów w stosunku do terenów otwartych. Istotna część odwiedzin na kwiatach V. myrtillus i C. vulgaris dokonywana była przez mrówki, co sugeruje, że owady te mogą mieć wpływ na reprodukcję badanych roślin.
    Źródło:
    Acta Agrobotanica; 2017, 70, 1
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calcareous nannofossil biostratigraphy and sedimentary environment of Valanginian–Hauterivian rhythmites (Silesian Nappe, Polish Carpathians)
    Autorzy:
    Kędzierski, M.
    Ochabska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/191763.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    calcareous nannofossils
    biostratigraphy
    Lower Cretaceous
    Silesian Nappe
    Polish Carpathians
    Tethyan-Boreal influences
    Opis:
    The results of semi-quantitative and qualitative studies of nannofossil assemblages in dark to light grey, rhythmically bedded, calcareous mudstones of the Upper Cieszyn Beds, Silesian Nappe of the Outer Carpathians are presented. The vertical variation in the carbonate content of these mudstones and changes in the composition of nannofossil assemblages, as well as the Shannon diversity index (SI), result from humid-arid climate changes, driving the trophic conditions of surface waters and nannoplankton biocalcification. These changes were control- led by the variable influences of both the Tethyan and Boreal provinces. The light grey mudstones were deposited during the dominance of warm waters from the Tethyan realm and some nannoconids, typical of the warm, stratified water of lower palaeolatitudes, occur here. The dark grey mudstones represent influences of the Boreal province, indicated by the appearance of Crucibiscutum sp. and a generally higher biodiversity demonstrated by SI. Climatic changes affected the stratification of surface water, expressed also by different linear fits for pairs of SI, Watznaueria barnesiae and Rhagodiscus asper. On the basis of the presence of Eiffellithus striatus, E. windii and signals of both Tethyan and Boreal influences. the section studied represents the uppermost Valanginian– lowermost Hauterivian boundary interval, i.e., the upper part of the BC5/BC6 nannofossil zones, related to the furcillata-radiatus ammonite zones.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2012, 82, 3; 225--237
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thinning effects on stand formation and modifications of a young pine/birch forest: a boreal zone case study
    Autorzy:
    Nakvasina, Elena Nikolaevna
    Voevodkina, Alexandra Viktorovna
    Volkov, Alexey Gennadievich
    Zakharov, Andrey Yurievich
    Koptev, Sergey Viktorovich
    Minin, Nicolai Stepanovich
    Powiązania:
    https://bibliotekanauki.pl/articles/2042461.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    strip cutting method
    boreal forest
    ecological interactions
    forest understory vegetation
    soil properties
    Opis:
    Thinning of young forests attracts the attention of scientists despite the long-term commercial effect. However, these researches are scarce. Therefore, it is important to study experiments with a long history. The aim of our study is to investigate the impact of thinning carried out in young pine/birch boreal forests on stand formation, natural regeneration, ground cover and properties of the soil layers in stands. We investigated three types of thinning in young pine/birch forests. In one plot of the initial stand, thinning was performed in two stages with a time interval of 27 years; in the first stage, thinning intensity was 75% of stems, while in the second stage, thinning intensity was 30%. In two other plots, thinning was performed in one stage at a stand age of 13 years, with thinning intensities of 76 and 84%. At the stand age of 72 years (2017), integrated studies of the silvicultural and ecological states were carried out. All thinned plots had developed into pure pine stands with 28–53% thicker stems, 12–18% higher trees and a growing stock 55–92% higher compared to the un-thinned reference stand. The most pronounced differences were observed for Option 1. With thinning, forest type changed to red whortleberry type, while the un-thinned reference site developed into a blueberry type forest. Thinning in young pine/birch stands results in the formation of pure pine stands. The associated modification of environmental properties changed the composition and density of the ground cover and some properties of the upper soil layers. Two-stage thinning had the least impacts; this approach can be used to produce stands with high commercial value. It is especially recommended for young pine/birch forests in the northern taiga.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2019, 61, 3; 197-210
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nutrient characteristics and proline accumulation in relation to Picea abies status on drained peat soils
    Autorzy:
    Cekstere, G.
    Osvalde, A.
    Snepsts, G.
    Laivins, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078188.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Norway spruce
    crown status
    soil and foliar analysis
    proline
    sub-boreal zone
    Opis:
    Monocultures of Norway spruce widely used for afforestation of drained peat soils often have low productivity and decline in vitality. The research aim was to elucidate: (1) imbalances in the nutrient status of soil and plants in relation to Norway spruce crown status and annual increment on drained peat soil in the sub-boreal zone; (2) the suitability of using proline accumulation as a biomarker for Norway spruce vitality and stress in nutrient imbalance conditions. The study was conducted at five forest (Oxalidosa turf. mel.) sites in Latvia, each containing trees with different crown condition status. Chemical analyses of soil and spruce needles, assessment of tree crown vitality and annual increment measurements were done. Our results revealed serious disturbances in the supply of nutrients, which is an important factor in the decline of Norway spruce in monoculture stands on drained peat soils. Deficiency of K, Fe, Cu, B, N and P was found in the current year needles for all trees, but in damaged trees (≥61% defoliation, ≥61% discoloration) Zn deficiency was also found. For 2-year-old needles, deficiency of K, P, S, Zn, and Cu was found in all trees, additionally, deficiency of Fe was found in healthy and medium damaged trees (26–60% defoliation, 21–60% discoloration), and N deficiency was found for medium damaged and damaged trees. Thus, K, Cu, B, Fe concentrations had significant negative correlations with crown status parameters – defoliation, discoloration, and density. K and B deficiency could play the most significant causal role in decreased stem increment. The results revealed that the stress amino-acid proline is a reliable biomarker, having a significant relationship with spruce crown condition parameters, annual increment and nutrient status in needles – low levels of K, Fe, S, Cu, B, N. The increase in proline content in spruce needles was pronounced in moderately damaged trees, indicating the potential for the use of proline accumulation as early stress indicator for spruce. Therefore, further studies on the identification of early stress and factors affecting nutrient uptake and accumulation in needles are particularly valuable for evaluation of stand management options before significant decline of spruce stands.
    Źródło:
    Dendrobiology; 2020, 84; 94-108
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A precise ammonite biostratigraphy through the Kimmeridgian-Volgian boundary beds in the Gorodischi section (Middle Volga area, Russia), and the base of the Volgian Stage in its type area
    Autorzy:
    Rogov, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061372.pdf
    Data publikacji:
    2010
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Kimmeridgian/Volgian boundary
    Volgian SSSP
    ammonite faunal horizons
    Boreal-Tethyan correlation
    Opis:
    A detailed study of the ammonite faunal horizons of the uppermost Kimmeridgian–Lower Volgian of the Middle Volga area (Russia) was undertaken at the most complete and well-known Gorodischi section. This section shows a complete transition from the Kimmeridgian to the Volgian and is a possible SSSP candidate for the Volgian Stage. Sixteen faunal horizons have been established between the top of the Eudoxus Zone and the top of the Lower Volgian. Revised descriptions of existing horizons (especially in the Kimmeridgian) are given and description of new horizons: cf. anglicum, aff. rebholzi, zeissi, ilowaiskii, cf. praecursor, sokolovi, pavida, “Franconites”. Oscillations in the ratios of ammonites with different affinities from horizon to horizon reflect short-term changes in the climate and/or palaeogeography. The presence of ammonites with Submediterranean affinities throughout the studied interval enables correlations to be made with the Tethyan ammonite succession. The evolution of the eudemic Subboreal lineage of Sarmatisphinctes has been analysed, and a succession of species through the complete Autissiodorensis Zone has been recognised. This comprises, in ascending order, S. cf./aff. subborealis, S. subborealis, S. zeissi, S. fallax and S. ilowaiskii. Two of the species described, Sarmatisphinctes zeissi and S. ilowaiskii, are new.
    Źródło:
    Volumina Jurassica; 2010, 8, 1; 103-130
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Middle Oxfordian to lowermost Kimmeridgian ammonite succession at Mikhalenino (Kostroma District) of the Russian Platform, and its stratigraphical and palaeobiogeographicai importance
    Autorzy:
    Głowniak, E.
    Kiselev, D.
    Rogov, M.
    Wierzbowski, A.
    Wright, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061380.pdf
    Data publikacji:
    2010
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ammonites
    biostratigraphy
    Boreal zonation
    Subboreal zonation
    Submediterranean zonation
    correlation
    Oxfordian/Kimmeridgian boundary
    Opis:
    The Mikhalenino section on the Russian Platform has yielded numerous ammonites from the Middle and Upper Oxfordian and lowermost Kimmeridgian, collected bed by bed. The ammonites belong mostly to the Boreal family Cardioceratidae, but also to the Subboreal family Aulacostephanidae; additionally at some levels there were collected various Submediterranean ammonites (Perisphinctidae, Oppeliidae and Aspidoceratidae). The co-occurrence of ammonites representative of different faunal provinces makes possible recognition of the Boreal, Subboreal, and partly also Submediterranean standard zonations. In consequence, it is possible to make a close correlation between these zonal schemes. The Oxfordian/Kimmeridgian boundary at the Pseudocordata/Baylei zonal boundary of the Subboreal zonal scheme corresponds precisely to the Rosenkrantzi/Bauhini zonal boundary. This boundary of the stages defined well faunistically in the Flodigarry section (Isle of Skye, Scotland) and proposed as a candidate for the uniform Oxfordian/Kimmeridgian boundary, can be also recognized in the Russian section studied. The boundary can be traced in the Mikhalenino section using the same criteria as used at Staffin: the appearance of the first representatives of Pictonia [M]–Prorasenia [m] (Subboreal), and the first appearance of Amoeboceras (Plasmatites) (Boreal). This indicates the large correlation potential of the boundary defined in this way. The research on the Mikhalenino section has provided the new palaeontological findings described in this study. These include the first discovery in the territory of the Russian Platform of ammonites of the genera/subgenera Decipia, Vineta and Pomerania (Pachypictonia). Two new species: Decipia (?) kostromensis sp. nov., and Pictonia mesezhnikovi n. sp. are described.
    Źródło:
    Volumina Jurassica; 2010, 8, 1; 5-48
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biostratigraphy and palaeoecology of the Dalichai Formation (Lower Cretaceous) based on calcareous nannofossils from the western Alborz Mountains (north-west Iran)
    Autorzy:
    Shiri, Rana
    Hadavi, Fatemeh
    Powiązania:
    https://bibliotekanauki.pl/articles/2060631.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Calcareous nannofossils
    Dalichai Formation
    Guydagh section
    Lower Cretaceous
    Tethyan and Boreal Domain
    western Alborz
    Opis:
    We describe the biostratigraphy and palaeoecology of the Dalichai Formation based on calcareous nannofossils from the Guydagh section in the western Alborz Mountains, north-west Iran. The nannofossils are moderately to well-preserved, and 25 species belonging to 8 genera have been distinguished, representing the Early Berriasian to Late Hauterivian ages according to the CC1-CC4b biozones of Sissingh (1977). The recorded nannofossils are generally Tethyan and cosmopolitan, while the record of Nannoconus inornatus, a Boreal species, at the top of the section reflects the water mass connection between the Boreal and Tethyan domains during the Late Hauterivian. The records of Nannoconus spp., Watznaueria spp., and Rhagodiscus asper show that the sedi mentary basin of the Dalichai Formation was located at low lati tudes of the Tethyan realm with warm surface waters. Palaeoecologically, the findings represent a marine transgression and increasing depth, and the palaeoenvironmental conditions change from low-high mesotrophic (shown by the dominance of W. britannica) to oligotrophic (from the dominance of nannoconids), r- to K-strategy of life (from the dominance of nannoconids), and became increasingly stable (shown by the reduction of W. britannica) towards the top of the section.
    Źródło:
    Geological Quarterly; 2021, 65, 4; 100--110
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Osadnictwo mezolityczne w południowej części Pojezierza Łagowskiego
    Autorzy:
    Sobkowiak-Tabaka, Iwona
    Pyżewicz, Katarzyna
    Okuniewska-Nowaczyk, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/1023880.pdf
    Data publikacji:
    2018-07-31
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    Pojezierze Łagowskie
    Boreal
    Atlantic
    Mesolithic
    Flint working
    Use-wear analysis
    Butchering activities
    Game hunting
    Opis:
    Despite a growing recognition of late Palaeolithic and Mesolithic settlement in recent years, the area of Pojezierze Łagowskie still represents one of less known regions of western Poland, both in terms of Old and Middle Stone Age settlement and reconstruction of of contemporary environmental conditions. The article provides results of technological, typological, functional analyses, as well as that of raw materials used in stone industry of Mesolithic communities occupying sites 13 and 16 in Wilenko. Majority of functional tools is characterised by use-wear traces, which should be interpreted as results of variability of meat, bone, antler, and leather processing activities or game hunting. In the article an attempt has been made to reconstruct environmental conditions, on the basis of the results of pollen analysis.
    Źródło:
    Folia Praehistorica Posnaniensia; 2017, 22; 183-220
    0239-8524
    2450-5846
    Pojawia się w:
    Folia Praehistorica Posnaniensia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sedimentary environments and stratigraphy of the Stipinai Formation (Upper Frasnian, northern Lithuania) : a sedimentary record of sea-level changes in the Main Devonian Field of the East European Platform
    Autorzy:
    Shiri, Rana
    Hadavi, Fatemeh
    Powiązania:
    https://bibliotekanauki.pl/articles/2058678.pdf
    Data publikacji:
    2021
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Calcareous nannofossils
    Dalichai Formation
    Guydagh section
    Lower Cretaceous
    Tethyan and Boreal Domain
    western Alborz
    Opis:
    We describe the biostratigraphy and palaeoecology of the Dalichai Formation based on calcareous nannofossils from the Guydagh section in the western Alborz Mountains, north-west Iran. The nannofossils are moderately to well-preserved, and 25 species belonging to 8 genera have been distinguished, representing the Early Berriasian to Late Hauterivian ages according to the CC1-CC4b biozones of Sissingh (1977). The recorded nannofossils are generally Tethyan and cosmopolitan, while the record of Nannoconus inornatus, a Boreal species, at the top of the section reflects the water mass connection between the Boreal and Tethyan domains during the Late Hauterivian. The records of Nannoconus spp., Watznaueria spp., and Rhagodiscus asper show that the sedimentary basin of the Dalichai Formation was located at low lati tudes of the Tethyan realm with warm surface waters. Palaeoecologically, the findings represent a marine transgression and increasing depth, and the palaeoenvironmental conditions change from low-high mesotrophic (shown by the dominance of W. britannica) to oligotrophic (from the dominance of nannoconids), r- to K-strategy of life (from the dominance of nannoconids), and became increasingly stable (shown by the reduction of W. britannica) towards the top of the section.
    Źródło:
    Geological Quarterly; 2021, 65, 4; 89--99
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biostratigraphy and palaeoenvironmental interpretation of the Dalichai Formation (Lower Cretaceous) in the eastern and central Alborz Mountains (North Iran) based on calcareous nannofossils
    Autorzy:
    Shiri, Rana
    Hadavi, Fatemeh
    Hazaveh, Fereshteh Sajadi
    Powiązania:
    https://bibliotekanauki.pl/articles/2060253.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    biostratigraphy
    palaeoecology
    Dalichai Formation
    Tethyan calcareous nannofossils
    boreal calcareous nannofossils
    eastern Alborz
    central Alborz
    Opis:
    OpracCalcareous nannofossils are described from 4 sections of the Lower Cretaceous Dalichai Formation from the Eastern (Tepal, Talu and Lavan sections) and central Alborz Mountains (Yonjezar section), Iran. Forty-two species belonging to 18 genera have been identified from the 4 sections studied, including 13 species belonging to 8 genera of ascidian didemnids only from the Tepal section. These taxa indicate the CC1-CC5 biozones of Sissingh's (1977) biozonation and an age of Berriasian to Early Barremian. The nannofossils recorded from the Dalichai Formation are generally Tethyan and cosmopolitan, while the presence of some Boreal taxa (Nannoconus abundans and N. borealis) may reflect connection between the Boreal and Tethyan realms in the Early Barremian. The sedimentary basin of the Dalichai Formation of the Tepal, Talu, and Yonjezar sections was located at low latitudes of the Tethyan realm with warm surface water. Also, trends of increasing depth and productivity, of a shift from r-selected to k-selected strategies and of a change from low-to-high mesotrophic to oligotrophic conditions, were deduced. A change from unstable to stable conditions towards the tops of sections is inferred for these localities. Laterally in the Dalichai Basin from the eastern to central Alborz, there was an increase in depth and productivity, and also a trend towards oligotrophic conditions and a dominance of low-stress conditions.owanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).
    Źródło:
    Geological Quarterly; 2020, 64, 3; 641--657
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Aucellina biostratigraphy of the Upper Albian (Early Cretaceous) of the Kirchrode I cored borehole, Hannover-Kirchrode, northern Germany
    Autorzy:
    Wood, C. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/139139.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Early Cretaceous
    Late Albian
    Aucellina
    Kirchrode Marls
    boreal marine environments
    kreda wczesna
    alb
    margle
    środowiska borealne
    Opis:
    The Aucellina biostratigraphy of the Upper Albian Kirchrode Marls Member succession in the Kirchrode I (1/91) cored borehole is described and the fauna illustrated. The borehole commenced at an unknown depth below the Early Cenomanian marls of the Bemerode Member, but higher beds of the Kirchrode Marls and the basal beds of the Bemerode Member were exposed in the Mittellandkanal and its Stichkanal extension at Misburg. The borehole and surface exposures permit a virtually complete Late Albian succession of Aucellina species to be observed. Published Aucellina range data from the borehole are reassessed and it is suggested that the lower part of the recorded range is based partly on misidentifications of fragments of thin-shelled bivalves such as Syncyclonema and Amussium. Aucellina appears in the borehole succession within the upper part of the Callihoplites auritus ammonite Subzone (Mortoniceras inflatum Zone) and continues to the top of the borehole succession within the Preaeschloenbachia briacensis ammonite Subzone (Stoliczkaia spp. Zone). Aucellina from higher in the briacensis Subzone collected from the Misburg Mittellandkanal section are also discussed and illustrated. There is some evidence that Aucellina occurs typically at levels in the borehole containing predominantly Boreal European Province ammonites, supporting the general inference that Aucellina lived in cooler northern waters. In contrast, Aucellina is poorly represented in intervals with Tethyan ammonites and thin-shelled inoceramids (e.g. the Mortoniceras (Durnovarites) perinflatum Subzone, Stoliczkaia spp. Zone). The briacensis Subzone, with an admixture of Tethyan (Stoliczkaia) and Boreal ammonites contains a distinctive, taxonomically highly diverse Aucellina assemblage. Relevant taxonomic research on European Late Albian and Early Cenomanian Aucellina faunas is reviewed. The Late Albian Aucellina succession in the borehole differs from that established from partially correlative successions in England.
    Źródło:
    Acta Geologica Polonica; 2016, 66, 4; 695-708
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ammonites and ammonite stratigraphy of the Bimammatum Zone and lowermost Pianula Zone (Submediterranean Upper Oxfordian) at Bobrowniki and Raciszyn in the Wieluń Upland, central Poland
    Autorzy:
    Wierzbowski, A.
    Głowniak, E.
    Pietras, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061382.pdf
    Data publikacji:
    2010
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ammonites
    taxonomy
    phylogeny
    stratigraphy
    Submediterranean zonalion
    Subboreal/Boreal zonations
    stratigraphical correlation
    Upper Oxfordian
    Lower Kimmeridgian
    Opis:
    An extensive collection of ammonites made bed by bed from sections in the Submediterranean Upper Oxfordian of the Wieluń Upland, Central Poland, is described and used as a basis for a chronostratigraphical interpretation of the deposits. The ammonites are mostly of Submediterranean character and enable the recognition of the Bimammatum Zone, including the Bimammatum and Hauffianum subzones, as well as the lowermost Planula Zone distinguished here as a new biostratigraphical horizon – the matyjai horizon – based on the occurrence of Subnebrodites matyjai Wierzbowski et Głowniak sp. nov. The Submediterranean ammonites are mostly oppeliids with Taramelliceras (Taramelliceras) [M] – Glochiceras (Lingulaticeras) [m] the most numerous, as well as Taramelliceras (Richeiceras) and Taramelliceras (Metahaploceras) [M] – Glochiceras (Coryceras) [m]. The profusion of ammonites of these two groups in the stratigraphical interval studied provides new information on their evolution, and two new oppeliid species, Taramelliceras (Taramelliceras) zelcense Wierzbowski et Głowniak sp. nov. and Glochiceras (Lingulaticeras) bobrownikiense Wierzbowski et Głowniak sp. nov., are described here. Subboreal and Boreal ammonites are not common in these sections, but are nevertheless important for correlation. Subboreal ammonites of the family Aulacostephanidae are represented by the genus Vineta [M], including its newly recognized microconchiate counterpart, Vineta [m], and a newly established genus Vielunia [M] Wierzbowski et Głowniak gen. nov., with type species Vielunia dzalosinensis Wierzbowski et Głowniak sp. nov. The latter genus includes ammonites previously referred in the area of study to Ringsteadia, and with a microconchiate counterpart assigned to Prorasenia [m]. The Boreal ammonites comprise late cardioceratids assigned to Amoeboceras (Plasmatites). These ammonites indicate that the deposits in question from the Submediterranean Bimammatum Zone up to the Planula Zone correlate with the Subboreal and Boreal lowermost Kimmeridgian (Baylei Zone, and Bauhini Zone, respectively).
    Źródło:
    Volumina Jurassica; 2010, 8, 1; 49-102
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Habitat conditions of the endangered species Salix myrtilloides in Eastern Poland
    Autorzy:
    Serafin, A.
    Pogorzelec, M.
    Banach, B.
    Mielniczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/41037.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    habitat condition
    habitat change
    endangered species
    Salix myrtilloides
    boreal relict
    physicochemical factor
    ecological succession
    Eastern Poland
    Polska
    Opis:
    Changes in habitat conditions in the area of Eastern Poland (Polesie Podlaskie), often associated with anthropopressure, cause a reduction in the number of locations and population size of valuable and rare bog plant species, including a Pleistocene boreal relict, Salix myrtilloides. The aim of this study was to determine the current conditions of occurrence of this species based on the physico-chemical parameters of peatland piezometric groundwater. The results confirm the declining trend in the number of locations and abundance of this species in the past few decades, but at the same time they confirm the wide range of amplitude of the many investigated factors. Among the groundwater parameters studied, the low level of nitrogen fractions, phosphorus fractions, cations, and DOC can be considered to be a set of conditions promoting the preservation of the Salix myrtilloides population. The higher concentrations of phosphates, sulfates, Na, Ca, and Mg as well as higher pH and electrolytic conductivity can be considered to be presumably unfavorable. The lack of significant differences in the values of the piezometric water factors investigated for the sites with different population sizes of the studied species requires the identification of other limiting factors and the implementation of programs for its active protection in Poland.
    Źródło:
    Dendrobiology; 2015, 73
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Foraminiferal assemblages as palaeoenvironmental bioindicators in Late Jurassic epicontinental platforms: Relation with trophic conditions
    Autorzy:
    Reolid, M.
    Nagy, J.
    Rodriguez-Tovar, F.J.
    Oloriz, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/22691.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    foraminiferal assemblage
    paleoenvironmental bioindicator
    Late Jurassic
    epicontinental platform
    trophic condition
    Jurassic
    Foraminifera
    neritic shelf
    Boreal Realm
    Tethys Ocean
    Opis:
    Foraminiferal assemblages from the neritic environment reveal the palaeoecological impact of nutrient types in relation to shore distance and sedimentary setting. Comparatively proximal siliciclastic settings from the Boreal Domain (Brora section, Eastern Scotland) were dominated by inner−shelf primary production in the water column or in sea bottom, while in relatively seawards mixed carbonate−siliciclastic settings from the Western Tethys (Prebetic, Southern Spain), nutrients mainly derived from the inner−shelf source. In both settings, benthic foraminiferal assemblages increased in diversity and proportion of epifauna from eutrophic to oligotrophic conditions. The proximal setting example (Brora Brick Clay Mb.) corresponds to Callovian offshore shelf deposits with a high primary productivity, bottom accumulation of organic matter, and a reduced sedimentation rate for siliciclastics. Eutrophic conditions favoured some infaunal foraminifera. Lately, inner shelf to shoreface transition areas (Fascally Siltstone Mb.), show higher sedimentation rates and turbidity, reducing euphotic−zone range depths and primary production, and then deposits with a lower organic matter content (high−mesotrophic conditions). This determined less agglutinated infaunal foraminifera content and increasing calcitic and aragonitic epifauna, and calcitic opportunists (i.e., Lenticulina). The comparatively distal setting of the Oxfordian example (Prebetic) corresponds to: (i) outer−shelf areas with lower nutrient input (relative oligotrophy) and organic matter accumulation on comparatively firmer substrates (lumpy lithofacies group) showing dominance of calcitic epifaunal foraminifera, and (ii) mid−shelf areas with a higher sedimentation rate and nutrient influx (low−mesotrophic conditions) favouring potentially deep infaunal foraminifers in comparatively unconsolidated and nutrient−rich substrates controlled by instable redox boundary (marl−limestone rhythmite lithofacies).
    Źródło:
    Acta Palaeontologica Polonica; 2008, 53, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proces powstawania subborealnych brzezin bagiennych (thelypterido-betuletum pubescentis czerwiński 1972) na wybranych torfowiskach Niziny Północnopodlaskiej
    Evolution of boreal bog-birch forest (thelypterido-betuletum pubescentis czerwiński 1972) in selected mires of North Podlasie Upland
    Autorzy:
    Matowicka, B.
    Drzymulska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/338962.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    NE Polska
    roślinność subfosylna
    subborealna brzezina bagienna
    torfowiska przejściowe
    boreal bog-birch forest
    NE Poland
    subfossil plant community
    transition mire
    Opis:
    Przedmiotem badań przeprowadzonych w latach 2007-2008 byłproces powstawania subborealnych lasów brzozowych, występujących na chronionych torfowiskach Niziny Północnopodlaskiej. Na podstawie analiz botanicznych szczątków makroskopowych (przebadano 164 próby osadu) odtworzono subfosylne zbiorowiska roślinne, poprzedzające fazę leśną roślinności torfowisk. Sosnowo-brzozowe lasy bagienne występują na średnio głębokich i głębokich torfach (średnio 2,3 m) rzadko podścielonych gytią. W osadach rozpoznano szczątki reprezentujące 51 taksonów różnej rangi. Roślinność subfosylna badanych torfowisk przynależy do czterech klas: Scheuchzerio-Caricetea nigrae, Phragmitetea, Oxycocco-Sphagnetea i Alnetea glutinosae. Zbiorowisko leśno-zaroślowe + turzyce-torfowce, pojawiające się na większości stanowisk, w warstwie stropowej złóż wyraźnie nawiązuje do współczesnego zespołu Thelypterido-Betuletum pubescentis i zawsze występuje w najmłodszym okresie holocenu. W ewolucji roślinności torfowisk rozwój brzezin był związany z występowaniem okresów klimatycznych o zmniejszonej wilgotności.
    The object of the study carried out between 2007 and 2008 was the process of evolution of boreal bog-birch forest situated on protected mires of North Podlasie Upland. The reconstruction of subfossil plant communities was based on the analysis of peat sediments (164 peat samples were studied). The boreal bog-birch forests are situated on medium-deep and deep peat ca. 2.3 m seldom underlined with gyttja layer. Remains of 51 different plant taxa were identified in the investigated peat sediments. They belonged to four vegetation classes: Scheuchzerio-Caricetea nigrae, Phragmitetea, Oxycocco-Sphagnetea and Alnetea glutinosae. In most locations, in the subsoil layer of peat deposit the forest-brushwood + Carex-Sphagnum community was identified. This subfossil community occurred during the Subboreal and Subatlantic periods and can be related to the contemporary Thelypterido-Betuletum pubescentis. Spreading of bog-birch forest onto mires was related to the occurrence of climatic periods featuring decreased humidity.
    Źródło:
    Woda-Środowisko-Obszary Wiejskie; 2009, 9, 4; 177-185
    1642-8145
    Pojawia się w:
    Woda-Środowisko-Obszary Wiejskie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calcareous nannofossil biostratigraphy and paleogeographic significance in the lower Maastrichtian of the Miechów Trough (southern Poland)
    Autorzy:
    Ciołko, Urszula
    Gaździcka, Elżbieta
    Powiązania:
    https://bibliotekanauki.pl/articles/2172616.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Lower Maastrichtian
    calcareous nannofossil biostratigraphy
    paleoecology
    cooling event
    Boreal province
    Miechów Trough
    mastrycht
    nanoplankton wapienny
    biostratygrafia
    paleoekologia
    prowincja borealna
    niecka miechowska
    Opis:
    Biostratigraphic analysis of calcareous nannofossils from the Pełczyska section in the Miechów Trough (southern Poland) has revealed that the entire section covers the lowermost Maastrichtian. The UC16bTP Tethyan subzone is designated based on the presence of Broinsonia parca constricta Hattner, Wind and Wise, 1980, reworked remains of Uniplanarius trifidus (Stradner) Hattner and Wise in Wind and Wise, 1983 and the simultaneous lack of Eiffellithus eximius (Stover) Perch-Nielsen, 1968. The studied section spans also the interval between the LO of Zeugrhabdotus praesigmoides Burnett, 1997 and the FO of Prediscosphaera mgayae Lees, 2007 (UC16 S3 Boreal subzone). Quantitative analysis of nannofossil assemblages has shown the dominance of cold water species (up to 50%), e.g., Micula decussata Vekshina, 1959, Prediscosphaera spp., Arkhangelskiella spp., Calculites obscurus (Deflandre) Prins and Sissingh in Sissingh, 1977 and Lucianorhabdus cayeuxii Deflandre, 1959. In the early Maastrichtian, the studied area was more influenced by cool water masses from the Boreal Province rather than by warm water from the Tethyan Province. The significant predominance of cold water taxa and the elevated presence of Prediscosphaera cretacea (Arkhangelsky) Gartner, 1968 also supports the hypothesis of climate cooling in the early Maastrichtian.
    Źródło:
    Acta Geologica Polonica; 2022, 72, 3; 331--352
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Bajocian to Kimmeridgian (Middle to Upper Jurassic) ammonite succession at Sentralbanken High (core 7533/3-U-1), Barents Sea, and its stratigraphical and palaeobiogeographical significance
    Autorzy:
    Andrzej, Wierzbowski
    Morten, Smelror
    Powiązania:
    https://bibliotekanauki.pl/articles/2060938.pdf
    Data publikacji:
    2020
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Middle and Upper Jurassic
    ammonites
    Boreal province
    Subboreal province
    correlation
    palaeobiogeography
    Jura środkowa i górna
    amonity
    prowincja borealna
    prowincja subborealna
    korelacja
    paleobiogeografia
    Opis:
    Ammonites recovered from Upper Bajocian to Upper Kimmeridgian strata in a core drilled at Sentralbanken High in the northern Barents Sea are described and chronostratigraphically interpreted. The lower part of the core comprises Upper Bajocian to Upper Callovian deposits of the Fuglen Formation with ammonites of the genus Cranocephalites near the base, and Longaeviceras in the upper part. The overlying Oxfordian to Kimmeridgian deposits of the Hekkingen Formation are thin and condensed. The Hekkingen Formation is dominated by Boreal cardioceratid ammonites (Cardioceras, Amoebites, Euprionoceras, Hoplocardioceras), with numerous Subboreal aulacostephanid ammonites (Rasenia, Zenostephanus) at two levels. The occurrences of Boreal and Subboreal ammonites are discussed in relation to the palaeogeography and fluctuations of ammonite faunas within the Boreal Realm during the Kimmeridgian with special attention to levels rich in Subboreal ammonites whose appearance has been controlled by tectonic and climatic factors. The uppermost part of the succession deposited during a time of maximum flooding in the Late Kimmeridgian is dominated by Boreal ammonites.
    Źródło:
    Volumina Jurassica; 2020, 18, 1; 1--22
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Próba oceny produktywności ekosystemu w warunkach polowych Wielkopolski
    An Attempt to Evaluate the Productivity of Ecosystems Under Field Conditions of Wielkopolska
    Autorzy:
    Kowalska, N.
    Chojnicki, B. H.
    Józefczyk, D.
    Urbaniak, M.
    Juszczak, R.
    Olejnik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819124.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    produktywność ekosystemu
    warunki polowe
    qinghai-tibetan plateau
    carbon dioxide
    alpine meadow
    CO2 exchange
    environmental control
    water vapor
    temperature
    boreal
    fluxes
    forest
    Opis:
    The Eddy Covariance technique has been applied for corn field NEE estimation. The Smith, Michaelis-Menten and Misterlich formulas has been used for calculation of net ecosystem exchange (NEE) values between corn canopy and the atmosphere. These approaches have been applied for estimation of temeparture and radiation modification impact on the corn field productivity. The NEE has been evaluated in the first part of this paper and then the relation of NEE runs and elements that influence the NEE values has been summarized. In another part the analysis of NEE under thermal and radiative conditions has been presented. The Michaelis-Menten model has been found as the most distinct one for the measurements of the relationship. This model indicated that the highest NEE value (NEE = 10.0 µmol m-2 s-1) has been found under combination of the low radiation and high temperature conditions. The lowest value of NEE has been estimated under the highest PPFD and lowest Ta amount. The applied models have confirmed relationship between NEE, PPFD and Ta. All three models confirmed the fact that the lowest ecosystem productivity is found under high radiation input. The accumulated NEE values were compared with the real values according to the Smith, Michaelis-Menten and Misterlich equations. The results of the Michaelis-Menten equation and Misterlich were the most similar to the real cumulative NEE values. The theoretical change of thermal (0.5°C increase) and radiation (4% decrease) resulted in tested higher CO2 sequesteration from the atmosphere.
    Źródło:
    Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 3; 2481-2495
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A boreal ostracod assemblage from the Callovian of the Lukow area, Poland
    Autorzy:
    Olempska, E
    Blaszyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/20975.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Nophrecythere intermedia
    Terquemula lutzei
    ostracod
    locality
    Polska
    Progonocythere callovica
    Ostracoda
    Baltic Sea
    taxonomy
    Jurassic
    Callovian
    Nophrecythere triebeli
    Quenstedtoceras lamberti
    boreal ostracod
    zoogeography
    paleontology
    ostracod fauna
    Lukow area
    Opis:
    Excellently preserved ostracods from large blocks of the late Callovian (Quenstedtoceras lamberti Zone) black clays occurring within glacial drift near Łuków, eastern Poland, are described. Unlike coeval faunas from other localities in Poland, the Łuków ammonite assemblage exhibits boreal affinities. The ostracod fauna broadly resembles those of the British Isles and northwestern Germany, there are also some similarites to Central Russia and northwestern Poland. Seventeen ostracod species are reported, and Schuleridea (Eoschuleridea) lukoviensis sp. n. is proposed. The ostracod assemblage is dominated by large number of specimens of Nophrecythere and Schuleridea (Eoschuleridea). The ostracods are of late Callovian age as indicated by the presence of Nophrecythere triebeli, Progonocythere callovica and advanced evolutionary forms of Nophrecythere intermedia and Terquemula lutzei. The most probable source of the Łuków clay blocks seems to be from the bed of the Baltic Sea north of Gdańsk.
    Kelowejskie kry glacjalne z okolic Łukowa są słynne z wyjątkowo pięknie zachowanych amonitów o aragonitowych ściankach muszli i pustych fragmokonach (Makowski 1952, 1962; Kulicki 1974, 1979; Dzik 1990) oraz wielu innych grup skamieniałości o niespotykanym stanie zachowania. Makrofauna ta zachowana jest w wapiennych konkrecjach występujących wśród czarnych iłów. W iłach z obrzeża konkrecji oraz w próbkach iłów pobranych z płytkich wierceń (Mizerski & Szamałek 1985), stwierdzono występowanie zespołu małżoraczków liczącego 17 gatunków naleążcych do 16 rodzajów. Utworzono jeden nowy gatunek Schuleridea (Eoschuleridea) lukoviensis. Zespół ten potwierdzający późno kelowejski wiek osadów z których zbudowane są kry łukowskie (poziom Quenstedtoceras lamberti) wykazuje duże podobieństwo do późnokelowejskich zespołów małżoraczkowych z północno-zachodnich Niemiec i Wielkiej Brytanii, w mniejszym stopniu do zespołów małżoraczkowych keloweju Centralnej Rosji i północno-zachodniej Polski. Obszarem źródłowym dla kier łukowskich było prawdopodobnie dno Bałtyku na północ od Gdańska: Skorupki małżoraczków cechują się wyjątkowo dobrym stanem zachowania, pozwalającym na obserwacje wielu cech morfologicznych dotychczas słabo poznanych u kelowejskich małżoraczków z innych obszarów Europy. Zespół małżoraczków z kier łukowskich zdominowany jest przez okazy gatunków rodzaju Nopherythere i Schuleridea (Eoschuleridea).
    Źródło:
    Acta Palaeontologica Polonica; 2001, 46, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ warunków siedliskowych na strukturę i zasobność drzewostanów świerkowo-sosnowych w Puszczy Augustowskiej
    Impact of site conditions on the structure and volume of spruce-pine stands in the Augustowska Primeval Forest
    Autorzy:
    Andrzejczyk, T.
    Drozdowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1016334.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    warunki siedliskowe
    hodowla lasu
    lesnictwo
    struktura drzewostanu
    drzewostany swierkowo-sosnowe
    zasobnosc drzewostanu
    Puszcza Augustowska
    norway spruce
    picea abies
    spruce−pine stands
    sub−boreal stands
    age structure
    multi−storeyed structure
    site
    Opis:
    The role of spruce in shaping the structure and volume of pine stands in the Augustowska Primeval Forest (north−eastern Poland) increases with the increase of site fertility. On poor coniferous forest sites, spruce occurs mainly in an understorey and sporadically as an admixture species, whereas on medium−fertile and fertile sites it builds the second storey and occurs in the upper storey accounting for about 30−40% of stand volume. In mature pine stands of the Augustowska Primeval Forest, spruce comes from natural regeneration. Taking into consideration the course of the regeneration process, four types of spruce age structure are distinguished.
    Źródło:
    Sylwan; 2007, 151, 01; 30-40
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-23 z 23

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