Trophic ecology of Pacific salmon (<Emphasis Type="Italic">Oncorhynchus</Emphasis> spp.) in the ocean: a synthesis of stable isotope research |
| |
Authors: | Susan P Johnson Daniel E Schindler |
| |
Institution: | (1) School of Aquatic and Fisheries Sciences, University of Washington, Box 355020, Seattle, WA 98195, USA |
| |
Abstract: | Increasing interest in the marine trophic dynamics of Pacific salmon has been motivated by the recognition of their sensitivity
to changing climate and to the competitive effects of hatchery fish on wild stocks. It has become more common to use stable
isotopes to supplement traditional diet studies of salmon in the ocean; however, there have been no integrated syntheses of
these data to determine whether stable isotope analyses support the existing conventional wisdom of feeding strategies of
the Pacific salmon. We performed a meta-analysis of stable isotope data to examine the extent of trophic partitioning among
five species of Pacific salmon during their marine lives. Pink, sockeye, and chum salmon showed very high overlap in resource
use and there was no consistent evidence for chum relying on alternative food webs dominated by gelatinous zooplankton. δ15N showed that Chinook and coho salmon fed at trophic levels higher than the other three species. In addition, these two species
were distinctly enriched in 13C, suggesting more extensive use of coastal food webs compared to the more depleted (pelagic) signatures of pink, sockeye,
and chum salmon. This paper presents the first synthesis of stable isotope work on Pacific salmon and provides δ15N and δ13C values applicable to research on the fate of the marine derived nutrients these organisms transport to freshwater and riparian
ecosystems. |
| |
Keywords: | Trophic partitioning Spatial partitioning Carbon Nitrogen Meta-analysis Stable isotope |
本文献已被 SpringerLink 等数据库收录! |
|