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    Wyświetlanie 1-3 z 3
    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
    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:
    Environmental changes during the last millennium recorded in subfossil Cladocera, diatoms and sediment geochemistry from Lake El Sol (Central Mexico)
    Autorzy:
    Zawisza, E.
    Cuna, E.
    Caballero, M
    Ruiz-Fernandez, A. C.
    Szeroczyńska, K.
    Woszczyk, W.
    Zawiska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060339.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    crater Nevado de Toluca
    lake sediments
    tropical alpine lake
    palaeolimnology
    last millennium
    Opis:
    High-altitude lakes, which are very sensitive ecosystems and respond rapidly to climatic changes, are one of the best targets for palaeolimnological studies. Here, we present the record of environmental changes over the last millennium that are recorded in the sediments of El Sol, a tropical, high-altitude, volcanic crater lake on the Nevado de Toluca, Central Mexico. Palaeolimnological reconstructions are based on subfossil Cladocera, diatoms, magnetic susceptibility and chemical analysis of the sediments. In general, Cladocera occurring in tropical regions, and especially at high altitude, have been studied very little. Our data indicate that in the sequence studied, the species diversity of subfossil Cladocera is very low. Only four species were recorded, and the assemblage is dominated by littoral species. Two Cladocera taxa, Alona manueli and Ilyocryptus, found at Lake El Sol are endemic. Cladocera, diatoms and the sediment chemistry show changes in Lake El Sol which are mostly related to climate. The most pronounced climatic signal was obtained for the early Little Ice Age (1350–1625 AD). This cold episode was expressed by a reduction in the frequency of zooplankton (individuals/cm2/yr) and diatoms (valves/g of dry sediment) and by changes in the organic carbon content in the sediment. Our results show that human activity was very limited throughout the study period. According to historical data the presence of humans at the lake shore was mostly occasional, usually for ceremonial and ritual purposes, and humans did not have an important influence on the lake ecosystem. Only one period was identified when human activity was important. This period corresponds to the introduction of fish into the lake at the beginning of the 20th century.
    Źródło:
    Geological Quarterly; 2017, 61, 1; 81--90
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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