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Wyświetlanie 1-15 z 39
Tytuł:
Ewolucja środowiska w rynnie jeziora Jasień w obrazie palinologicznym i zmian fauny Cladocera
Environmental change in the Jasień Lake trough as revealed by palynology and Cladocera faunal change
Autorzy:
Miotk-Szpiganowicz, G.
Niska, M.
Powiązania:
https://bibliotekanauki.pl/articles/294308.pdf
Data publikacji:
2008
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
paleolimnologia
analiza pyłkowa
analiza Cladocera
palaeolimnology
palynological analysis
Cladocera analysis
Opis:
Na obszarze rynny jeziora Jasień zlokalizowano cztery stanowiska, dla których wykonano analizę palinologiczną i analizę szczątków Cladocera. Celem badań było odtworzenie przemian środowiska przyrodniczego na tym terenie. Rdzenie, z których pobrano próby do analiz, składały się głównie z osadów typu gytia i torf. Próbki do analiz wykonywano według standardowych procedur. Do obróbki danych liczbowych wykorzystywano program POLPAL. Otrzymane wyniki palinologiczne umożliwiły odtworzenie historii roślinności badanego terenu począwszy od okresu borealnego, a analiza szczątków Cladocera dostarczyła informacji o fazach rozwoju części zbiornika jeziornego Obrowo Duże.
In order to reconstruct the environmental history of the Jasień Lake trough, pollen analysis and an analysis of Cladocera remains have been simultaneously carried out. Sediments for pollen research have been collected in the bay section of the Jasień Lake and in the Obrowo Małe peat bog. Cladocera remains have been sampled in two sites within a peat bog adjacent to the Obrowe Duże Lake. Preparation of samples for both analyses followed standard procedures. Numerical data have been elaborated using the POLPAL software. The results of the palynological study have allowed to decipher vegetation history since the Boreal period. The peat bog of Obrowo Małe began to form at the onset of the Atlantic period. Cladocera remains yielded information about phases of water body evolution in the part of the Obrowo Duże Lake, which subject to silting transformed into a low-level valley bog, and then into a transitional peat bog. Pollen and Cladocera analyses have been carried out on material collected at dissimilar sites, which practically excludes the possibility of correlation of results and allowed one only to reconstruct the major hydrological changes, common for the entire region. In the latest Holocene, in the Jasień Lake trough a trend towards water level decrease is observed due to both climatic and human impact. Further changes included the rise of trophic level in the lake and vegetation succession onto the shallower parts of the lake.
Źródło:
Landform Analysis; 2008, 7; 102-112
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The long-lasting resistence of diapausing eggs from Arctic Cladocera frozen at 18°C
Autorzy:
Meijering, Meertinus P.D.
Powiązania:
https://bibliotekanauki.pl/articles/2052078.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Cladocera
diapausing eggs
Źródło:
Polish Polar Research; 2003, 24, 2; 167-172
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Younger Dryas climatic reconstructions in central Poland
Autorzy:
Pawłowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/139212.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Younger Dryas
cladocera
temperature
oxbow lake
climate
młodszy dryas
Cladocera
temperatura
starorzecze
klimat
Opis:
Cladoceran-based paleotemperature estimates for the Younger Dryas for ten sections of paleo-oxbow lakes, valley mires, and lacustrine sediments from central Poland are presented, and their potential usefulness to climatostratigraphy is described. Most of the changes observed in the cladoceran assemblages are responses to climate changes. The cladoceran-based temperature reconstructions reflect cold conditions during the Younger Dryas (YD) and allow a division of this period into two phases: an older colder phase, between 12,800 and 12,000 cal yrs BP, and a younger, warmer phase, between ca. 12,000 and 11,500 cal yrs BP. The geomorphological features of the study sites and local environmental forces are also taken into consideration. The cladoceran-inferred summer temperature estimates from all of the study sites correspond closely with the available climate reconstruction for the YD in central Europe.
Źródło:
Acta Geologica Polonica; 2017, 67, 4; 567-584
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Description of subfossil post-abdomen and post-abdominal claw of Ceriodaphnia (Cladocera, Daphniidae)
Autorzy:
Nevalainen, Liisa
Powiązania:
https://bibliotekanauki.pl/articles/2026911.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cladocera
Ceriodaphnia
subfossil remains
identification
Opis:
Cladoceran remains preserve selectively in lake sediments. Possibly all Cladocera species leave at least some identifiable remains in lake sediments. Exosceletal body parts of families Chydoridae and Bosminidae preserve best but other families are only variably represented in sediments by their outer body parts. Identification of all possible remains helps to achieve more precise palaeolimnological reconstruction of past ecosystems by Cladocera analysis. This article describes, together with photograph and line drawing the subfossil post-abdomen and post-abdominal claw of Ceriodaphnia, previously not widely identified.
Źródło:
Studia Quaternaria; 2007, 24; 65-67
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Air temperature and water level inferences from northeastern Lapland (69°N) since the Little Ice Age
Autorzy:
Luoto, Tomi P.
Kivilä, E. Henriikka
Kotrys, Bartosz
Płóciennik, Mateusz
Rantala, Marttiina V.
Nevalainen, Liisa
Powiązania:
https://bibliotekanauki.pl/articles/2041809.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
paleoclimate
precipitation
temperature
Chironomidae
Cladocera
Źródło:
Polish Polar Research; 2020, 41, 1; 23-40
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Findings of Alona protzi Hartwig 1900 (Branchiopoda: Anomopoda. Chydoridae) in Finland
Autorzy:
Nykänen, Mirva
Sarmaja-Korjonen, Kaarina
Powiązania:
https://bibliotekanauki.pl/articles/2026957.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cladocera
Alona protzi
biogeography
ecology
Finland
Opis:
Alona protzi is a rare spe cies of Cla do cera, oc cur ring in lake lit to ral through out Europe. How ever, lit tle is known about this ani mal, and so far it has not been in cluded in pro vi sional lists of spe cies found in Fin land. In this short re port we pres ent our find ings of Alona protzi, both re cent and sub fos sil ma te rial, as well as one pre vi ous, un pub lished finding site of the spe cies in Fin land. We found three sub fos sil shells of this spe cies in the bot tom sedi ments of two lakes. In a third lake we found in tact ani mals, an ephip pial fe male and a male, while sam pling stony bot tom of lake lit to ral.
Źródło:
Studia Quaternaria; 2007, 24; 73-77
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cercopagis pengoi (Cladocera) conquered the southern Baltic Sea
Autorzy:
Zmudzinski, L.
Powiązania:
https://bibliotekanauki.pl/articles/85031.pdf
Data publikacji:
1998
Wydawca:
Akademia Pomorska w Słupsku
Tematy:
Cercopagis pengoi
Cladocera
Baltic Sea
water flea
Opis:
The Ponto-Caspian cladocera Cercopagis pengoi invaded the Baltic Sea in 1992. For the first time it was recorded in the Gulf of Riga and three years later it appeared in the Gulf of Finland. In the summer of 1999 it had been also found in huge numbers in shallow areas (0.5 - 10 m) of the Gulf of Gdańsk.
Źródło:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline; 1998, 02
1643-0115
Pojawia się w:
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Palaeohydrological aspect of transformation of lakes into peat bogs during Middle Holocene on the basis of Cladocera analysis in the northern Poland
Autorzy:
Szeroczyńska, Krystyna
Gąsiorowski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2027409.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cladocera remains
fossil lakes
Middle Holocene
palaeohydrology
Opis:
Cladocera are a group of water animals, which are strongly dependent on environmental conditions. The ratio of planktonie to littoral Cladocera species is a widely used tool in palaeohydrological reconstruction of lakes' water level changes. Interpretation of this ratio is still unclear and requires further evidence. The simplest indicator of water level, which can be used in tracing lake-peat bog transitions, is the presence or absence of Cladocera and the character of its disappearance. In general, two models of Cladocera decline are observed. The first model is characterized by a very abrupt disappearance of all species, whereas the second one. with an intermediate stage, is characterized by domination of specific species. These two models are related to different types of terminal history of the water body. Even after a total disappearance of water in the peat bogs, there were episodes of some pioneer cladoceran species presence, correlated with periods of humid climate.
Źródło:
Studia Quaternaria; 2002; 55-60
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fossil Cladocera re mains in the Eemian sediments – preservation, frequency and dominant species
Autorzy:
Niska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2027074.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cladocera analysis
palaeocology
Eemian Interglacial
Early Vistulian
Polska
Opis:
This pa per pres ents the re sults of fos sil Cladocera anal y sis us ing ma te rial ob tained from seven palaeolakes of the Eemian inter gla cial lo cated in Po land. The main aim of this study was to in ves ti gate the state of pres er va tion and diver sity of spe cies in the Eemian Cladocera. The stud ied Eemian lakes were formed at the end of the Wartanian Gla ciation in tun nel and ket tle holes. They had pre served a con tin u ous re cord of en vi ron men tal changes through out the Eemian inter gla cial, un til the Vistulian Gla ci ation. Cladocera fos sils found in Eemian sed i ments were thin ner and had a more dam aged struc ture than fos sils from the Ho lo cene. Low de gree of fos sil pres er va tion forced to de velop an al terna tive method for prep a ra tion of the fos sils for the mi cro scopic anal y sis. Cladocera spe cies found in the ex am inedpalaeolakes cor re sponded to the pres ent-day spe cies in hab it ing Po land and Cen tral and North ern Eu rope. The changes in species composition resulting from climate changes corresponded to the current geographic distribution of Cladocera. De spite the poor con di tion of the ob tained fos sil re mains, the re sults showed that cladoceran fos sils in sed i ments of palaeolakes may be used in the re con struc tion of en vi ron men tal con di tions from the pe riod pre ced ing the last gla ci ation.
Źródło:
Studia Quaternaria; 2012, 29; 31-43
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of Cladocera communities across a climate gradient in shallow lakes from Croatia to Hungary: a preliminary study
Autorzy:
Kövér, Csilla
Korponai, János
Katalinic, Ana
Bereczki, Csaba
Powiązania:
https://bibliotekanauki.pl/articles/2027088.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Subfossil Cladocera
cli mate change
train ing set
Opis:
Cladocera com mu ni ties in sur face sed i ments of seven lakes were sam pled from the Med i ter ra nean to north Hun gary. Con duc tiv ity, pH, pri mary ions (Ca2+, Mg2+, Na+, K+, Cl–, SO4 2–, HCO3 –, CO3 2–) and macrophyte cov er age were measured as con trib uted en vi ron men tal pa ram e ters for the dis tri bu tion of cladoceran com mu ni ties across the lakes. Thirtytwo cladoceran spe cies were found in the seven lakes. The re corded spe cies have wide tol er ance spec tra, and are able to col o nize very dif fer ent kind of hab i tats. The most com mon and abun dant spe cies were Chydorus sphaericus, Alona rectangula and Bosmina longirostris. Lake area, lat i tude, macrophyte cov er age, pH, con duc tiv ity and hard ness were found to be the most de ter mi nant en vi ron men tal vari ables in the dis tri bu tion of cladoceran spe cies. This study revealed that al though the lakes show a clear sep a ra tion in en vi ron men tal pa ram e ters the com po si tion and dis tri bu tion of Cladoceran com mu ni ties dif fer only slightly across the in ves ti gated geo graph ical gra di ent.
Źródło:
Studia Quaternaria; 2012, 29; 45-52
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isotopic and Cladocera records of climate changes of Early Eemian at Besiekierz (Central Poland)
Autorzy:
Mirosław-Grabowska, J.
Niska, M.
Powiązania:
https://bibliotekanauki.pl/articles/2059552.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Central Poland
palaeoclimate
Eemian Interglacial
cladocera
stable isotopes
Opis:
Results of stable isotope, Cladocera and pollen analyses of lacustrine sediments from Besiekierz (Central Poland) are presented. The Besiekierz palaeolake is located about 25 km north of Łódź (Central Poland) at 130 m a.s.l. The 4 m thick deposits comprise silty sands and clayey silts, overlain by calcareous gyttja and organic silts and peat. Pollen analysis documents that these deposits accumulated during the Eemian Interglacial and the Early Vistulian. Based on the results of stable isotope analyses, nine isotopic horizons (Is) were defined and characterized, and these enabled reconstruction of both climatic and hydrological changes. A positive trend in δ18O values and constant values of δ 13 suggest gradual climatic warming, while constant values of δ 18O and δ 13C indicate stable conditions and/or a fast rate of sedimentation. The fluctuation of isotopic values in the upper part of the succession probably points to a shallowing of the lake due to sedimentary infill. The subfossil cladoceran fauna in the Besiekierz succession is represented by 11 solely littoral species belonging to 3 families. Four zones of Cladocera development were distinguished. The Besiekierz palaeolake was a shallow reservoir. The initial period of its existence probably saw its greatest depth. The Cladocera species present indicate the initial oligotrophic status of the lake and its subsequent increase in trophic status.We compare the results of the isotopic, cladoceran and published palynological analyses, to distinguish and explain the phases of evolution of the lake.
Źródło:
Geological Quarterly; 2005, 49, 1; 67--74
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Description of the subfossil head shield of Alona protzi Hartwig 1900 (Anomopoda, Chydoridae) and the environmental characteristics of its finding sites
Autorzy:
Bjerring, Rikke
Nykänen, Mirva
Sarmaja-Korjonen, Kaarina
Sinev, Artem
Jensen, Karina
Nevalainen, Liisa
Szeroczyńska, Krystyna
Zawisza, Edyta
Powiązania:
https://bibliotekanauki.pl/articles/2026063.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Subfossil Cladocera
Alona protzi
head shield
description
paleolimnology
Opis:
This pa per gives a de scrip tion of the head shield of Alona protzi, a rare spe cies of Cla do cera (wa ter fleas) whose separated head shield has not yet been de scribed in de tail. Sub fos sil head shields of A. protzi were found in sedi ment cores taken from lakes in Den mark, Swe den, Fin land, Es to nia and Po land. De spite the rar ity of the spe cies this sug gests a wide dis tri bu tion of A. protzi in north ern Europe. The ecol ogy of A. protzi is poorly known. The en vi ron mental spec -trum of the find ing sites was wide and ranged from rela tively nu tri ent poor clear wa ter lakes to eutrophic tur bid wa terlakes, in di cat ing that A. protzi is not nar rowly re stricted. Most of the lakes were, how ever, meso- eutrophic with neu tral to high pH, and with a rela tively low abun dance of sub merged mac ro phytes. How ever, we can not ex clude the pos si bility that A. protzi mainly lives in ground wa ter and is only oc ca sion ally trans ported into lakes.
Źródło:
Studia Quaternaria; 2008, 25; 47-53
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unusual stable morphotype of Acroperus harpae (Baird, 1834) from Lake Mývatn, Iceland (Cladocera: Anomopoda: Chydoridae) revealed by palaeolimnological studies
Autorzy:
Sinev, A.Y.
Zawisza, E.
Einarsson, A.
Powiązania:
https://bibliotekanauki.pl/articles/2027090.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Subfossil Cladocera
Acroperus harpae
new macrophototype description
paleolimnology
Opis:
A new un usual morphotype of Acroperus harpae (Baird, 1834) was found in Lake Mývatn and its neigh bour ing Lake Budlungaflói in Ice land. This form, A. harpae f. multidentata is char ac ter ized by a very large head keel and by 5–9 denticles on the posterovental an gle of the valves in stead of 1–3 com mon for A. harpae. The new form did not dif fer from typ i cal A. harpae in the mor phol ogy of the postabdomen, head pores or any ap pend ages. A study of Lake Mývatn sed i ments rev eled that this form ex isted in the lake for at least two thou sand years.
Źródło:
Studia Quaternaria; 2012, 29; 3-7
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Palaeogeographical significance of the Eemian biogenic sediments at Bór site (Warta River valley, Central Poland)
Autorzy:
Petera-Zganiacz, J.
Borówka, R.K.
Forysiak, J.
Miotk-Szpiganowicz, G.
Pawłowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/2060307.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
gyttja
palynology
cladocera
geochemistry
Warta River valley deposits
Opis:
An investigated area is located in the middle reach of the WartaRiver valley. During drillings in the Bór site organic deposits such as detritous calcareous gyttja and calcareous detritous gyttja has been documented in a depth between 14,9 and 16,6 m. The organic deposits are covered by mineral, mostly sandy deposits. The accumulation took place in the small lake formed as an abandoned channel. Palynological analysis led to conclusion that biogenic accumulation began at the end of Wartanian and took place at least to the Eemian Interglacial optimum. Results of palynological, Cladocera and geochemical analysis inform about water level changes and increasing of trophy status of the reservoir. Presence of Mesozoic substratum very close to the palaeolake bottom influenced significantly chemical features of the organic deposits. As Eemian organic deposits are uncommon in the Warta River valley, the Bór site seems important for palaeogeographical reconstructions of the Warta River valley during Eemian Interglacial.
Źródło:
Geological Quarterly; 2013, 57, 4; 687--700
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
First records of Alona werestschagini sinev in Finland - subfossil remains from subarctic lakes
Autorzy:
Sarmaja- Korjonen, Kaarina
Sinev, Artem Yu.
Powiązania:
https://bibliotekanauki.pl/articles/2026066.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Chydorid Cladocera
Alona werestschagini Sinev
palaeolimnology
northern Finnish Lapland
Opis:
Sub fos sil re mains of a new spe cies of Cla do cera (wa ter fleas) of the fam ily Chy do ri dae in Fin land, Alona wer estschagini Si nev, were found in the sedi ments of four lakes above the treeline in north ern most Fin nish Lap land. The remains were found in sur face sedi ments of three lakes and in early Holo cene sedi ments of one lake where the spe cies was a pio neer which soon dis ap peared. The re mains of A. wer est schagini, ex cept the male postab do men, closely re sem ble Alona gut tata. In Eura sia A. wer est schagini has a wide but patchy dis tri bu tion in cold cli mates, sug gest ing that it is a post gla cial rel ict adapted to cold cli mate and oligo trophic lakes. Re cently it has been found also in Nor way and Kola Pen in sula. The early Holo cene finds in di cate that the spe cies spread to north ern most Fin land af ter the re treat of the Scan di na vian Ice Sheet. Since the spe cies has been found in lakes in very se vere con di tions it may be used as a palaeo lim no logi cal in di ca tor in sedi ment stud ies.
Źródło:
Studia Quaternaria; 2008, 25; 43-46
1641-5558
2300-0384
Pojawia się w:
Studia Quaternaria
Dostawca treści:
Biblioteka Nauki
Artykuł
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