caa a22 4500 445893524 CHVBK 20180317145624.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10750-010-0531-1 doi (NATIONALLICENCE)springer-10.1007/s10750-010-0531-1 Does oxygen availability regulate sexual reproduction in local populations of the littoral cladoceran Alonella nana ? [Elektronische Daten] [Liisa Nevalainen, Kaarina Sarmaja-Korjonen, Tomi Luoto, Seija Kultti] We investigated sexual reproduction patterns of a ubiquitous littoral cladoceran Alonella nana (Anomopoda, Chydoridae), using ecological and paleoecological approaches to clarify the forcing mechanisms behind its sexual reproduction. Contemporary sampling of A. nana populations in two environmentally different lakes showed abundant sexual reproduction in the lake with eutrophic, oxygen-deficient conditions and scarce gamogenesis in the oligotrophic, well-oxygenated lake. Sediment core studies from the same lakes indicated that comparable sexual reproduction patterns had prevailed for many centuries. However, in eutrophic Lake Hampträsk, A. nana increased its sexual reproduction from 1700ad onward, consistently with decreasing trend in chironomid-inferred oxygen. The core samples, together with a surface sediment dataset of 25 lakes from southern and central Finland, showed a negative correlation between ephippia of A. nana and winter oxygen, although the surface sediment data per se did not show any significant correlation. When the dataset was scaled locally to include lakes in close proximity in southern Finland, the correlation became clearer. The results imply that the spatial and temporal variations in sexual reproduction of A. nana populations may partly be explained by differences in oxygen levels. Springer Science+Business Media B.V., 2010 Alonella nana nationallicence Chydorids nationallicence Diapause nationallicence Finland nationallicence Paleoecology nationallicence Nevalainen Liisa Institute for Limnology, Austrian Academy of Sciences, Mondseestrasse 9, 5310, Mondsee, Austria aut Sarmaja-Korjonen Kaarina Department of Geosciences and Geography, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland aut Luoto Tomi Institute for Limnology, Austrian Academy of Sciences, Mondseestrasse 9, 5310, Mondsee, Austria aut Kultti Seija Department of Geosciences and Geography, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland aut Hydrobiologia Springer Netherlands 661/1(2011-02-01), 463-468 0018-8158 661:1<463 2011 661 10750 https://doi.org/10.1007/s10750-010-0531-1 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-010-0531-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Nevalainen Liisa Institute for Limnology, Austrian Academy of Sciences, Mondseestrasse 9, 5310, Mondsee, Austria aut NATIONALLICENCE 700 1- Sarmaja-Korjonen Kaarina Department of Geosciences and Geography, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland aut NATIONALLICENCE 700 1- Luoto Tomi Institute for Limnology, Austrian Academy of Sciences, Mondseestrasse 9, 5310, Mondsee, Austria aut NATIONALLICENCE 700 1- Kultti Seija Department of Geosciences and Geography, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 661/1(2011-02-01), 463-468 0018-8158 661:1<463 2011 661 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer