Skip Navigation

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (58)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by Lauridsen, T.
Right arrow Articles by Sønergaard, M.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Lauridsen, T.
Right arrow Articles by Sønergaard, M.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 12 | PAGES 2283-2294 | 1996
© Oxford University Press

research-article

The importance of macrophyte bed size for cladoceran composition and horizontal migration in a shallow lake

Torben Lauridsen, Leif Junge Pedersen, Erik Jeppesen and Martin Sønergaard

National Environmental Research Institute; Department of Lake and Estuarine Ecology Vejlsøvej 25, PO Box 314, DK-8600 Silkeborg, Denmark

Received on July 24, 1995; accepted on July 11, 1996 Cladoceran composition and diel horizontal migration were studied in 2, 10 and 25 m diameter macrophyte exclosures established in the littoral zone of shallow Lake Stigsholm, Denmark. The exclosures were protected from waterfowl grazing, but open to fish. The macrophyte community cornprized Potwnogeton pectinatus, Potamogeton pusillus and Callitriche hemaphroditica. Cladocerans were sampled randomly every third hour inside and outside the macrophyte exclosures during a 24 h period. In the 2m exclosure, the pelagic species Ceriodaphnia spp. and Bosmina spp. dominated during the day, mean density being as high as 3430 indiv. l–1 During the night, density decreased to 10–20% of the daytime density thus indicating diel horizontal migration. In the 10 and 25 m exciosures, the daytime mean density of Ceriodaphnia spp. was 865 and 202 indiv. l–1, respectively, and did not decrease at night. In contrast to the pelagic species, the density of macrophyte-associated species tended to be higher in the 10 and 25 m exclosure than in the 2 m exclosure. In the daytime, Eurycercus lamellatus density in the 2, 10 and 25 rn macrophyte exclosures was 7, 28 and 16 indiv. l–1 respectively, while that of Simocephalus vetulus was 11, 171 and 92 mdiv. l–1, respectively. There was no thy-night difference in the density of macrophyte-associated species. We conclude that cladoceran community composition varies with macrophyte bed size, and that the edge zone between the bed and open water is an important daytime refuge for potentially migrating pelagic cladocerans.


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?




Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.