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标题：Paleolimnological evidence for increased sexual reproduction in chydorids (Chydoridae, Cladocera) under environmental stress
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作者：Liisa NEVALAINEN ; Tomi P. LUOTO ; Suzanne LEVINE 等
期刊名称：Journal of limnology
印刷版ISSN：1129-5767
电子版ISSN：1723-8633
出版年度：2011
卷号：70
期号：2
页码：255-262
DOI：10.4081/jlimnol.2011.255
出版社：Istituto italiano di idrobiologia
摘要：To investigate the extent to which anthropogenic perturbations such as eutrophication and trace metal pollution (i.e., environmental stress sensu Odum 1985) influence the reproductive modes of cladoceran populations, we analyzed the abundance of subfossils of the chydorids Alonella nana (Baird, 1850) and Alona affinis (Leydig, 1860) in sediment cores from three Finnish lakes.Reconstruction of lakes' pollutant history and the biological response of chydorids indicate that in two of the lakes the proportion of individuals reproducing sexually increased with environmental stressors.More specifically, A.nana responded to eutrophication in Lake Hampträsk with greater production of ephippia, while A.affinis responded to aluminum pollution or acidification in Lake Pieni Majaslampi.In contrast, the reference lake, Lake Iso Lehmälampi, showed no radical changes in sexual reproduction over the twomillennium long sediment record.We conclude that chydorids may use sexual reproduction as a strategy for overcoming unexpected environmental stresses.
关键词：aquatic environments; Crustacea; diapause; subfossils; eutrophication; pollution