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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:
    Cenotes - lakes of the Yucatan Peninsula (Mexico)
    Autorzy:
    Szeroczyńska, Krystyna
    Zawisza, Edyta
    Powiązania:
    https://bibliotekanauki.pl/articles/2025766.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cenotes
    Yucatan
    Mex ico
    phytoplankton
    zoo plank ton
    Opis:
    Cenote lakes are nat u ral sink holes or de pres sions re sult ing from the col lapse of lime stone bed rock ex pos ing the ground wa ter un der neath. Thou sands of such lakes are par tic u larly en coun tered on the Yucatan Pen in sula (Mex ico). These lakes were of great sig nif i cance for the Maya cul ture as im por tant re li gious places and pri mary source of drinking wa ter. They per mit ted the sur vival of Ma yan com mu ni ties through dry pe ri ods known as “Maya drought”. Most of the cenote lakes are large open wa ter pools mea sur ing tens of me ters in di am e ter. The ma jor ity of cenotes are smaller shel tered sites. Their wa ters are usu ally very clear and oligotrophic, orig i nat ing from rain wa ter fil ter ing slowly through the ground. The au thors vis ited and col lected zoo plank ton sam ples from eight cenotes in No vem ber 2013, namely: Ik-Kil, Samula, Zaci, X-Kekn, Actum Ha, Cristal, Sian Ka’an, and Chan Chemuxil (transect Merida–Tulum– Cancun). The ana lysed lakes dif fer con sid er ably in mor pho log i cal terms, vary ing from very deep to shal low. Some of them are un der hu man im pact (tour ists). The wa ter sam ples were ana lysed for zoo plank ton con tent, but the phytoplank ton fre quently oc cur ring was also taken into ac count. The ob tained re sults are largely var ied, in di cated big eco -log i cal ver ity among cenotes which de pended on lake age, lo cal iza tion and morphometry. As showed our study Cladocera zoo plank ton was very rare and only pres ent at sev eral sites. Be tween the fauna com mu nity Copepoda and Ostracoda spe cies were the most abun dant. Phytoplankton were pres ent in all stud ied lakes and it sees that played the cen tral role in those eco sys tems.
    Źródło:
    Studia Quaternaria; 2015, 32; 53-57
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    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:
    Initial time of two high altitude crater lakes (nevado de toluca, central mexico) recorded in subfossil cladocera
    Autorzy:
    Szeroczyńska, Krystyna
    Zawisza, Edyta
    Wojewódka, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/2025798.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    crater lakes
    Sol and Luna Lakes
    palaeolimnological studies
    Cladocera and chemical components
    Nevado de Toluca
    Central Mexico
    Opis:
    The ob jec tive of this study was the rec og ni tion and re con struc tion of the or i gin of two high al ti tude lakes and the ecolog i cal con di tions of their early ex is tence based on subfossil Cladocera and chem i cal anal y ses. The study fo cused on the old est lac us trine sed i ments from Lake Sol and Lake Luna, lo cated in the crater of Vol cano Nevado de Toluca (Cen tral Mex ico). The Nevado de Toluca crater de vel oped ap prox i mately 12 ka yr BP. Ac cord ing to the lit er a ture, the vol cano was last ac tive ap prox i mately 3.3 ka yr BP, and the lakes de vel oped af ter that erup tion. The re mains of nine Cladocera spe cies were found in the bot tom sed i ments of both lakes. The most dom i nant taxa were two en demic lit toral spe cies: Alona manueli and Iliocryptus nevadensis. The to tal fre quency of Cladocera spec i mens in both of the sed iment cores was very low. No Cladocera re mains were re corded in the sed i ment layer at depths be tween 123–103 m from Lake Luna. The re sults of the lithological and geo chem i cal anal y ses showed that this sed i ment layer was com posed of allochthonous ma te rial, prob a bly orig i nat ing from slid down from the vol ca nic cone. This was sug gested by the con - tent of sil ica (up to 13%), iron (up to 12%), and ti ta nium (up to 4%). The Cladocera re mains re corded in the bot tom sed i - ments sug gested that both res er voirs de vel oped as fresh wa ter lakes at the be gin ning of the sed i men ta tion. The cal i brated ra dio car bon dates ob tained for the bot tom sam ples were 4040 to 3990 yr BP for Lake Luna (129 cm) and 4485 to 4485 yr BP for Lake Sol (89 cm). The ob tained ages were older than the dates of the last erup tion, which oc curred ap prox i mately 3300 yr BP. This re sult was likely re lated to the type of ra dio car bon dated ma te ri als (charcoals).
    Źródło:
    Studia Quaternaria; 2015, 32; 109-116
    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:
    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
      Wyświetlanie 1-6 z 6

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