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Wyświetlanie 1-5 z 5
Tytuł:
The influence of variability of water resources in lowland forests on selected parameters describing the condition of trees
Autorzy:
Tyszka, J.
Stolarek, A.
Fronczak, E.
Powiązania:
https://bibliotekanauki.pl/articles/11996.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
variability
water resource
lowland forest
climatic function
hydrological function
selected parameter
tree condition
periodical change
stand condition
extreme climate
water condition
river list
habitat condition
tree stand
Opis:
The influence of water conditions on the condition and growth of tree stands has been analysed in the context of the climatic and hydrological functions forest plays. Long observational series obtained for precipitation, outflow and depths below the surface of the water table have been put together with measured increases in the breast-height diameters of Scots pines and the severity of crown defoliation observable in selected tree species growing on the Polish Lowland, in order to determine the overall scope to the reaction stand condition manifests in the face of ongoing variability of water conditions within forest. An overall improvement in the condition of stands over the last 20 years does not disguise several-year cyclicity to changes capable of shaping the situation, i.a. departures from long-term mean values for precipitation totals and groundwater levels. The condition of stands is seen to worsen in both dry and wet years. Analysis of the degree to which pine, spruce and broadleaved stands experience defoliation points to spruce stands responding most to extreme hydro-climatic conditions. Extreme situations as regards water resources were seen to involve a response over two-year time intervals in the case of coniferous stands. Unsurprisingly, optimal growing-season (June-September) precipitation totals correspond with long-term average figures, while being slightly higher for spruce (at 384 mm), than for Scots pine or broadleaved species (375 mm). The relationships reported gain confirmation in analysis of periodic change in breast-height diameter increments characterising Scots pines, whose growth is seen to depend closely, not only on precipitation, but also above all on the depth of the water table in the summer half-year. Optimal depths of the water table proved to be different, being around 20 cm below ground in the case of marshy coniferous forest, 80 cm in wet habitats, and 135 cm in fresh habitats. Depending on the possibilities for water to soak into the rooting zone of trees there were even twofold differences in measured growth increments in Scots pine (as the dominant species in Poland’s lowland habitats). The maintenance of stable water conditions (as the most variable environmental factor in forest) should be an overriding aim of management activity in this habitat. When account is taken of the influence of the state of water resources on biomass production, and then on the intensity of evapotranspiration and the absorption of carbon dioxide from the atmosphere, it is seen how important it is to achieve improvements in water conditions in forests, as such an important factor in combating climate change.
Źródło:
Papers on Global Change; 2014, 21
2300-8121
1730-802X
Pojawia się w:
Papers on Global Change
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molluscs of the Krutynia River (Masurian Lakeland)
Autorzy:
Jakubik, B.
Lewandowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/83073.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
mollusc
Krutynia River
Mazurian Lakeland
long-term change
river
snail
bivalve
species list
shell
gastropoda
Bivalvia
Opis:
Studies on molluscs of the Krutynia River (Masurian Lakeland) carried out in 2008-2009 (July) revealed the presence of 38 species (21 species of snails and 17 species of bivalves). The number of species per site ranged from 4 (middle section) to 27 (mouth section of the river). Snails Bithynia tentaculata, Viviparus contectus, Radix balthica and bivalves Sphaerium corneum, Dreissena polymorpha, Anodonta anatina, Unio pictorum and U. tumidus were found along the whole river course. The highest densities that locally reached 200 indiv./m2 were noted for Theodoxus fluviatilis and the largest biomass of over 2.5 kg/m2 – for the unionid bivalves, mainly for Unio tumidus.
Źródło:
Folia Malacologica; 2011, 19, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The species richness of the flora of selected sections of the Mietiułka River in the Polesie National Park
Bogactwo gatunkowe flory wybranych fragmentów rzeki Mietiułki w Poleskim Parku Narodowym
Autorzy:
Pogorzelec, M.
Powiązania:
https://bibliotekanauki.pl/articles/28606.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
vascular flora
species richness
flora
Mietiulka River
Polesie National Park
watercourse
species composition
species list
Opis:
The aim of the study was to conduct an environmental evaluation of 6 selected sections of the improved Mietiułka River, which included an inventory and analysis of the vascular flora associated directly with this watercourse. The results of the study have shown that the flora of the study area is diverse in taxonomic, syntaxonomic and ecological terms, and that it comprises both typical aquatic plants and species characteristic of the habitats surrounding the river. In the flora found in the study sectors, a total of 114 vascular plant species was identified, which come from 42 botanical families, 15 syntaxonomic classes and belong to different ecological groups. Hemicryptophytes, spontaneophytes, species neutral to continentality as well as species included in the phytochorion with boreal elements: Euro-Siberian subelement, were clearly predominant in the species composition of the flora of all the study sectors. The macrophytes commonly found in Poland had the largest proportion. One species with a small number of stands in the country – water dropwort (Oenanthe fistulosa) – as well as two species threatened with extinction, Sagittaria sagittifolia and Hypochoeris glabra, were recorded.
Źródło:
Acta Agrobotanica; 2010, 63, 2
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitive species in a bad habitat – species richness of ichthyofauna in the strongly anthropogenically transformed Uszwica River (southern Poland)
Autorzy:
Klich, Mariusz
Klich, Sabina
Powiązania:
https://bibliotekanauki.pl/articles/1402394.pdf
Data publikacji:
2020
Wydawca:
Państwowa Wyższa Szkoła Zawodowa w Tarnowie
Tematy:
Uszwica river
ichthyofauna
anthropopressure
protected species
red list of fish
red list of lampreys
rzeka Uszwica
ichtiofauna
antropopresja
gatunek chroniony
czerwona lista ryb
czerwona lista minogów
Opis:
The Uszwica River is a 67 km long right-bank submountain tributary of the Vistula. From the beginning of the 20th century the Uszwica was subjected to strong anthropopressure. The water course was disrupted at km 37+300 with a 5.3-meter-high dam in the town of Brzesko. Strong pollution of water in this town and numerous hydrotechnical alterations along almost the entire course of the river have negative influence on the river habitats. Despite this, the Uszwica is characterized by relatively rich ichthyofauna composed of 26 species, including 6 species which are legally protected in Poland and 7 species regarded threatened according to the Polish Red List of fish and lampreys[1]. The composition of ichthyofauna was determined on the basis of electrofishing along the entire river in 2004 and 2015, and on selected reaches in 2014 and 2018. The results show that even heavily anthropogenically transformed rivers may provide habitats for threatened fish species and should not be excluded from nature protection plans and projects.
Rzeka Uszwica to prawobrzeżny podgórski dopływ Wisły o długości 67 km. Od początków XX. wieku Uszwica podlega silnej antropopresji: przegrodzeniu w połowie jej biegu w km 37+300 zaporą o wysokości 5,3 metra w miejscowości Brzesko oraz silnym zanieczyszczeniu wody w tej miejscowości, a także licznym regulacjom na niemal całym biegu rzeki. Pomimo tego rzeka charakteryzuje się bogatą ichtiofauną reprezentowaną przez 26 gatunków, w tym 6 gatunków prawnie chronionych w Polsce oraz 10 gatunków wrażliwych i zagrożonych wg kategorii czerwonej listy ryb i minogów Polsce. Stan ichtiofauny określono na podstawie elektropołowów ryb przeprowadzonych na całej długości rzeki w latach 2004 i 2015 oraz na wybranych odcinkach w roku 2014 i 2018. Wyniki badań wskazują na to, że nawet rzeki uznane za silnie przekształcone antropogenicznie mogą stanowić siedlisko dla cennych przyrodniczo gatunków ryb i nie powinny być pomijane w planach i projektach dotyczących ochrony przyrody.
Źródło:
Science, Technology and Innovation; 2020, 9, 2; 46-55
2544-9125
Pojawia się w:
Science, Technology and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diversity of aquatic malacofauna of temporary water bodies within the lower Bug River floodplain
Autorzy:
Jurkiewicz-Karnkowska, E.
Powiązania:
https://bibliotekanauki.pl/articles/83766.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
diversity
aquatic malacofauna
malacofauna
temporary water body
water body
Bug River
flood plain
mollusc
aquatic mollusc zob.water mollusc
gastropod
water mollusc
species composition
species richness
Polska
species list
occurrence
Opis:
This study analyses the composition, species richness and diversity (H’) of aquatic molluscan communities in temporary water bodies within the valley of the lower Bug River in eastern Poland. The investigations were carried out in 2007–2009 within the section of the valley located between 190th and 50th km of the river course in 50 water bodies. Relatively rich and diverse malacofauna was found in the investigated habitats: 32 snail species and 6 bivalve species. Species diversity (H’) in individual water bodies ranged from 0.44 to 3.48. About 40% of all mollusc species showed frequencies of _10%. Dominance patterns varied much among the water bodies. Mollusc abundance ranged from 20 to over 1,800 indiv./m2. Considerable species richness and diversity were found both within the active floodplain and the former one. This was probably related to the long duration of many of the investigated water bodies, as well as their periodical hydrological connectivity with permanent ones or river channel. From 9 to 12 samples should be enough to compile representative species list of molluscs inhabiting temporary water bodies, but as many as 28–40 samples would be necessary to obtain complete dataset.
Źródło:
Folia Malacologica; 2011, 19, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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