Abstract:
:We used carbon and nitrogen stable isotopes from muscle tissues accrued in the ocean to examine whether marine foraging tactics in anadromous sockeye salmon (Oncorhynchus nerka) are linked to their ultimate freshwater life history as adults. Adults from large-bodied populations spawning in deep freshwater habitats had more enriched δ(15)N than individuals from small-bodied populations from shallow streams. Within populations, earlier maturing individuals had higher δ(15)N than older fish. These differences in δ(15)N suggest that the fish with different life histories or spawning habitats in freshwater either fed at different trophic positions or in different habitats in the ocean. We propose that, nested within interspecific diversity in the ecological attributes of salmon, population and life-history diversity in spawning adults is associated with variation in marine foraging tactics. These results further indicate that the trophic diversity of sockeye salmon in the ocean may be linked to trade-offs in ecological and evolutionary constraints they eventually experience as adults in freshwater ecosystems.
journal_name
Biol Lettjournal_title
Biology lettersauthors
Johnson SP,Schindler DEdoi
10.1098/rsbl.2012.0824subject
Has Abstractpub_date
2013-02-23 00:00:00pages
20120824issue
1eissn
1744-9561issn
1744-957Xpii
rsbl.2012.0824journal_volume
9pub_type
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