Abstract:
:A laboratory experiment was conducted to determine whether the sea star Asterias forbesi and the naticid gastropod Euspira heros feed on surfclams, Spisula solidissima, in an additive or non-additive manner. Predators were allowed to feed on clams with conspecifics and in the presence of the other predator species. Clam mortality (measured as the rate of decline of clam number) and predator feeding rates were noted. To determine the effects of temperature on interactions among the predators, the experiment was conducted at three different temperatures. At all temperatures, feeding rate of each predator was not affected by the presence of the other species, and clam mortality in the presence of both predators was predictable from mortality in the presence of a single predator species. These additive interactions are most likely a result of habitat partitioning between the predators, with naticid snails being infaunal and sea stars being epifaunal. Previous studies in a variety of systems show no clear pattern of occurrence of non-additive interactions. Relatively small differences in predator or prey behavior may be responsible for the presence or absence of non-additive interactions.
journal_name
Oecologiajournal_title
Oecologiaauthors
Weissberger EJdoi
10.1007/s004420050808subject
Has Abstractpub_date
1999-05-01 00:00:00pages
461-466issue
3eissn
0029-8549issn
1432-1939pii
10.1007/s004420050808journal_volume
119pub_type
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