Journal
JOURNAL OF LIMNOLOGY
Volume 70, Issue 2, Pages 255-262Publisher
PAGEPRESS PUBL
DOI: 10.4081/jlimnol.2011.255
Keywords
aquatic environments; Crustacea; diapause; subfossils; eutrophication; pollution
Categories
Funding
- Academy of Finland
- Kone Foundation
Ask authors/readers for more resources
To investigate the extent to which anthropogenic perturbations such as eutrophication and trace metal pollution (i.e.. environmental stress sensu dun, 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 Hamptrask 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 Lehmalampi, showed no radical changes in sexual reproduction over the two-millennium long sediment record. We conclude that chydorids may use sexual reproduction as a strategy for overcoming unexpected environmental stresses.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available