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    Wyświetlanie 1-6 z 6
    Tytuł:
    The significance of subfossil Cladocera in stratigraphy of Late Glacial and Holocene
    Autorzy:
    Szeroczyńska, Krystyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2027068.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stratigraphy
    “ecostratigraphy” – biostratigraphy
    climate
    lakes
    lacustrine sediments
    subfossil Cladocera
    Opis:
    This pa per pres ents dis cus sion on the re sults of sub fos sil Cla do cera analy ses from five lakes in Po land (Przedni Staw Lake, Per es pilno Lake, Gooeci¹¿ Lake, Imio³ki- fossil lake and Os trow ite Lake). The Cla do cera are rep re sented in sediments by re mains of plank tonic (Bos mini dae, Daph ni dae) and lit to ral (Chy do ri dae) forms. Cla do ceran as sem blage phases (“ecos tra tigra phy”) were de ter mined on the ba sis of changes in domi nance of in di ca tor spe cies and past ecologi cal con di tions were re con structed. The re sults are be ing dis cussed from the view point of cli mate change and anthro po genic ac tiv ity and their role in the lake evo lu tion. Moreo ver, an at tempt to use the cla do ceran phases for stra tigraphic di vi sion of the Late Gla cial and Holo cene was made. Dur ing the Bøl ling/Al lerød in ter sta dial, dis tin guished on the ba sis of pol len analy sis, Cla do cera in di cated short phase of bad con di tion (dry or cold?), proba bly as the Old Dryas cli mate re sults. The be gin ning of Holo cene is char ac ter ized, in moun tain and low land lakes, by high in -crease in the number of spe cies and speci mens of Cla do cera. This de scribed clear warm ing and marked the bound ary Late Gla cial/Holo cene. It was in di cated that the “ecos tra tigra phy” based on Cla do cera can be use ful for cli ma to stratigra phy, if cli mate was the ma jor fac tor con trol ling the de vel op ment of fresh wa ter lakes.
    Źródło:
    Studia Quaternaria; 2006, 23; 37-45
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Warunki ekologiczne rozwoju późnovistuliańskiego zbiornika Koźmin Las w świetle analizy Cladocera
    Ecological conditions of the small Late Vistulian pond of Koźmin Las site in the light of Cladocera analysis
    Autorzy:
    Pawłowski, Dominik
    Powiązania:
    https://bibliotekanauki.pl/articles/578365.pdf
    Data publikacji:
    2014
    Wydawca:
    Łódzkie Towarzystwo Naukowe
    Tematy:
    dolina Warty
    subfosylne szczątki Cladocera
    młodszy dryas
    aktywność fluwialna
    powodzie
    klimat
    Warta River valley
    subfossil Cladocera
    Younger Dryas
    fluvial activity
    floods
    climate
    Opis:
    Rezultaty analizy subfosylnych szczątków wioślarek (Cladocera) z profilu osadów organicznych stanowiska Koźmin Las (dolina Warty, Polska Środkowa) pozwoliły przedstawić rekonstrukcję rozwoju opisywanego zbiornika i odnieść je do ak-tywności fluwialnej Warty, szczególnie w okresie młodszego dryasu, pomiędzy 12 900 i 11 600 cal BP. Wyróżniono dwie fazy rozwoju zbiornika. Stwierdzono, że był to płytki zbiornik, o niestabilnych warunkach hydrologicznych. Prawdopodobną przyczyną fluktuacji był zmienny poziom wód gruntowych, powierzchniowych i rzecznych w dolinie Warty. Zmiany we frekwencji Cladocera skorelowano z aktywnością fluwialną rzeki oraz, w szerszym ujęciu, z warunkami klimatycznymi panującymi w młodszym dryasie.
    The sediments from small pond infillings located in the Warta River valley in central Poland was studied by Cladocera analysis in order to examine the response of aquatic ecosystems to environmental changes in the Younger Dryas. Lithological and geochemical records were also used to reconstruct fluvial activity of the Warta River. In the Koźmin Las site development, between ca. 12.900 and 11.600 cal BP, prevailed variable hydrological conditions. Cladocera analysis indicates the presence of shallow pool and partly telmatic conditions. The local processes, such as the influence of the Warta River, habitat modification, macrophyte presence, and eutrophication, were important, but these forces were not only major factors that affect the biota diversity in the Younger Dryas. The observation of changes in the composition and concentration of aquatic communities in the studied pool indicates that the changes also occurred in response to climate changes.
    Źródło:
    Acta Geographica Lodziensia; 2014, 102; 65-70
    0065-1249
    Pojawia się w:
    Acta Geographica Lodziensia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    500 years of ecological changes recorded in subfossil Cladocera in a high-altitude, tropical lake Lago de la Luna, central Mexico
    Autorzy:
    Zawisza, E.
    Caballero, M.
    Ruiz-Fernandez, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027080.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    subfossil Cladocera
    crater Nevado de Toluca
    lake sed i ment
    Opis:
    We pres ent the last 500 years of his tory of a high-al ti tude trop i cal lake Lago de la Luna lo cated at Nevado de Toluca crater, Cen tral Mex ico, based on subfossil Cladocera anal y sis. Through the stud ied sed i men tary se quence only five Cladocera spe cies were pres ent. Cladocera com mu nity was dom i nated by lit to ral spe cies (4) and among them one (Ilyocryptus nevadensis) is en demic. The de tailed anal y sis of the sed i ments (ev ery 1 cm) al lowed us to track con tem - po rary cli ma tic and anthropogenic changes. Our re sults showed that Lago de la Luna is a very sen si tive eco sys tem and has strong re sponse to cli ma tic changes. The most re mark able change in the Cladocera com mu nity was ob served between 1683–1780 yr, which was well cor re lated with the Lit tle Ice Age. PCA re sults im plied that mod ern state of the lake Lago de la Luna is very sim i lar to one 400–500 yr ago. Only one pe riod was iden ti fied when hu man im pact was of im por tance. This pe riod seemed to cor re late with changes in the lake eco sys tem due to fish in tro duc tion in the 1950s.
    Źródło:
    Studia Quaternaria; 2012, 29; 23-29
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Subfossil Chydorid taxa and assemblages from lake sediments in Poland and Finland with special reference to climate
    Autorzy:
    Sarmaja-Korjonen, Kaarina
    Szeroczyńska, Krystyna
    Gąsiorowski, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/2027446.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    subfossil Cladocera
    chydorids
    Finnish lakes
    Polish lakes
    climate
    redundancy analysis
    Opis:
    In this study we compared chydorid cladoceran (Chydoridae) taxa and assemblages from sediments of 6 Polish and 6 sq Finnish lakes and investigated if the difference in climate of these two countries can be detected in the cladoceran data. The data were analysed in terms of I) average relative proportions of chydorid taxa during the history of each lake and by 2) redundancy analysis (RDA) to explain the present effect of environmental variables (altitude, area, maximum depth, mean annual temperature, mean summer temperature and length of the growing season) on species abundances. The redundancy analysis (RDA) enabled us to distinguish groups of taxa I) with a high thermal preference 2) associated with small, cold-water lakes and 3) associated with shallow lakes. There are clear differences in the dominant chydorid taxa and in the relative proportions of many other chydorid taxa between the two countries since the end of the last glaciation. Although these differences first of all appear to reflect the climatic difference, the influence of many other environmental factors, controlling the living conditions of particular chydorids have been raised and considered. Further studies with larger data are needed before the role of climate can be reliably separated from other elements of environment.
    Źródło:
    Studia Quaternaria; 2003; 25-34
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Late-Glacial cladoceran succession in three lakes of the Chełm Hills Region ( Łęczna-Włodawa Lake Group, SE Poland)
    Autorzy:
    Suchora, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027077.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Late-Gla cial
    subfossil Cladocera
    Łęczna-Włodawa Lake Group
    Chełm hills
    Opis:
    High res o lu tion stud ies on subfossil Cladocera from three closely lo cated lakes of the Che³m Hills Re gion – Lake S³one, Syczyñskie, and Pniówno, ev i denced a strong zoo plank ton re sponse to the well-known cli ma tic changes of the Late-Gla cial and early-Ho lo cene. The gen eral changes in the cladoceran com mu nity struc ture re sem ble those de - scribed from other Pol ish and Eu ro pean lakes. Cer tain im por tant dif fer ences were iden ti fied, how ever, which can be at trib uted to the pe cu liar ity of the en vi ron men tal con di tions of the re gion, re gard ing: the deep char ac ter of the lakes stud ied al ready in the ini tial phase of their de vel op ment (Older Dryas), an in ten sive eutrophication pro cess in duced by the Alleröd cli mate warm ing with a pe ri od i cal low er ing of the trophic sta tus, and the char ac ter of the Youn ger Dryas cool ing less se vere than in some other re gions. The chro nol ogy of the palaeoenvironmental changes iden ti fied by means of subfossil Cladocera anal y sis was based on the re sults of palaeobotanical anal y sis, and con firmed by ra diocar bon dat ing avail able for two pro files. Tak ing ad van tage of the close lo ca tion of the study sites, their morphometric and geo log i cal sim i lar i ties, and the high res o lu tion of sam pling, an at tempt was made to use cladoceran suc ces sion in or der to es tab lish the strati graphic di vi sion for Lake Pniówno, lack ing palynological and ra dio car bon data.
    Źródło:
    Studia Quaternaria; 2012, 29; 9-21
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Algal and invertebrate microfossil assemblages from lake sediments in the reconstruction of past community dynamics - preliminary information
    Autorzy:
    Antipushina, Z.
    Szeroczyńska, K.
    Zawisza, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027085.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lake sed i ments
    subfossil Cladocera
    subfossil phyto- and zoo-or gan isms
    thanatocoenosis
    Late Ho lo cene
    Opis:
    This pa per fo cuses on the use ful ness of a palaeolimnological method called the joint algological and zoo log i cal anal ysis. The joint algo-zoo log i cal anal y sis in volves count ing all iden ti fi able re mains of the main al gae groups (Bacillariophyta, Cyanophyta, Desmidiales, other Chlorophyta, Trachelomonas sp.) and in ver te brate groups (Cladocera, Ostracoda, Chironomidae, Chaoborus sp., and other in sects, Turbellaria, Bryozoa, Spongia and Testacida) in vol u met ric sam ples. We pres ent re sults from re cent sed i ments of Lake Glubokoe (Mos cow re gion, Rus sia) as an ex am ple of the ap pli ca tion of this method. We re con struct the struc ture of phytoplankton, zoo plank ton and zoobenthos com mu ni ties and their dy nam ics over the last 25 years. Our re sults sup port the va lid ity of this method in the re con struc tion of the struc ture of phyto- and zoo plank ton com mu ni ties and their dy nam ics, in for ma tion that may be lost when car ry ing out sep a rate anal y ses for in di vid ual groups. Sim plic ity is an other ad van tage of this meth od ol ogy.
    Źródło:
    Studia Quaternaria; 2012, 29; 53-58
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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