Title

Influence Of Temperature On Site-dependent Predation By A Fish (gasterosteus Aculeatus) And A Jellyfish (aurelia Aurita) On Larval Capelin (mallotus Villosus)

Document Type

Article

Publication Date

12-1-1997

Publication Title

Canadian Journal Of Fisheries And Aquatic Sciences

Department

Biology

Abstract

We compared the size-dependent mortality patterns of newly emerged larval capelin (Mallotus villosus) at three different temperatures (3, 9, and 15 degrees C) when exposed to predation by threespine stickleback (Gasterosteus aculeatus) and moon jellyfish (Aurelia aurita). Controlled experiments were conducted in both microcosms (38 L) and mesocosms (3100 L). Some temperature-related trends were evident in experiments with sticklebacks, but not with jellyfish. Sticklebacks fed selectively on smaller capelin larvae at 15 degrees C, were nonselective at 9 degrees C, and fed on larger larvae at 3 degrees C. There was no prey size selection by A. aurita at any of the temperatures examined. Our findings support the view that the direction and magnitude of size-selective predation vary depending on the predator-prey assemblage and environmental conditions examined.

Volume

54

Issue

12

pp.

2759-2766

ISSN

0706-652X