Journal
FRESHWATER BIOLOGY
Volume 47, Issue 10, Pages 1866-1878Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-2427.2002.00934.x
Keywords
calcium content; crustacea; Daphnia; softwater; zooplankton
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1. The occurrence and species composition of crustacean zooplankton in Norwegian lakes was related to ambient Ca concentrations, pH, total phosphorus and chlorophyll a , and to the presence/absence of other zooplankters and a planktivorous fish (roach: Rutilus rutilus). 2. Ambient Ca concentrations appeared to influence the distribution of Daphnia species: Daphnia longispina often occurred in Ca-rich lakes with low fish-predation pressure while the smaller Daphnia cristata often occurred in opposite conditions. 3. Body Ca contents were measured in zooplankters from a wide range of localities, to examine Ca requirements and thus the potential for Ca-limitation of common species. 4. All Daphnia species had relatively high specific Ca contents [ranging from 0.8 to 4.4% Ca dry weight (DW) (-1)] compared with other cladocerans and also copepods (ranging from 0.1 to 0.4% Ca DW-1). Within the Daphnia genus, the specific Ca content increased with increasing body size of the species, and thus the large-bodied species had especially high Ca demands. 5. Because of their high Ca demands, species of Daphnia could be competitively disadvantaged in softwater lakes relative to less Ca-demanding species.
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