Presenter/Author Information

Kathleen P. CieriFollow

Type of Presentation

Snapshot

Session Title

Toxics, Pollutants and Species

Description

Many marine upwelling ecosystems are characterized by low species diversity of the middle tropic level. In wasp-waist systems such as the San Juan Archipelago, forage fishes serve as an important trophic link between zooplankton and apex predators. The Pacific herring and the Pacific sand lance are two important forage fish in this region with different life histories that may influence different feeding ecologies. This study explores the trophic ecology of the Pacific sand lance through diet analysis and observations of diel behavior. Calanoid copepods appear to be the preferred prey item of sand lance, while herring prefer amphipods. Lab and field observations indicate that sand lance are crepuscular feeders. These results further elucidate the strategies Pacific sand lance have developed in order to maximize foraging while minimizing predation risk.

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Diet and Feeding Behavior of Ammodytes personatus and Clupea palasii in the San Juan Archipelago (Fall 2015)

2016SSEC

Many marine upwelling ecosystems are characterized by low species diversity of the middle tropic level. In wasp-waist systems such as the San Juan Archipelago, forage fishes serve as an important trophic link between zooplankton and apex predators. The Pacific herring and the Pacific sand lance are two important forage fish in this region with different life histories that may influence different feeding ecologies. This study explores the trophic ecology of the Pacific sand lance through diet analysis and observations of diel behavior. Calanoid copepods appear to be the preferred prey item of sand lance, while herring prefer amphipods. Lab and field observations indicate that sand lance are crepuscular feeders. These results further elucidate the strategies Pacific sand lance have developed in order to maximize foraging while minimizing predation risk.