Evidence for Niche Differences in Sympatric Populations of Cerastoderma edule and C. lamarcki

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Abstract
Yearly growth rates of a single year class of coexisting cockles C. (Cardium) edule (L.) and C. lamarcki (Reeve) show interspecific differences. Differences in habitat conditions influence growth rates of the 2 spp. differently at the 2 Danish fjord localities compared. At the Aggersborg locality, the 2 spp. grow at similar rates; habitat conditions at the Langerak locality cause faster growth of C. edule, but slower growth of C. lamarcki. Habitat niche dimensions of the 2 spp. are demonstrated to be different.