Limited diversity in natal origins of immature anadromous fish during ocean residency
Walther, Benjamin D.
Thorrold, Simon R.
MetadataShow full item record
Variable migration patterns can play a significant role in promoting diverse life history traits among populations. However, population and stage specific movement patterns are generally unknown yet crucial aspects of life history strategies in many highly migratory species. We used a natural tag approach using geochemical signatures in otoliths to identify natal origins of one-year-old anadromous American shad (Alosa sapidissima) during ocean residency. Otolith signatures of migrants were compared to a database of baseline signatures from 20 source populations throughout their spawning range. Samples were dominated by fish from only two rivers, while all other potential source populations were nearly or completely absent. These data support the hypothesis that American shad exhibit diverse migratory behaviors and immature individuals from populations throughout the native range do not all mix on northern summer feeding grounds. Rather, our results suggest populations of anadromous fish are distributed heterogeneously at sea in the first year of life and thus may encounter different ocean conditions at a critical early life history stage.
Author Posting. © The Authors, 2009. This is the author's version of the work. It is posted here by permission of NRC Research Press for personal use, not for redistribution. The definitive version was published in Canadian Journal of Fisheries and Aquatic Sciences. 67 (2010): 1699-1707, doi:10.1139/F10-086.
Showing items related by title, author, creator and subject.
Walther, Benjamin D.; Thorrold, Simon R.; Olney, John E. (American Fisheries Society, 2008-01-03)Population connectivity is a critical component in the life history dynamics of anadromous fishes and in the persistence of local populations. We used geochemical signatures in the otoliths of American shad Alosa sapidissima ...
Mather, Martha E.; Finn, John T.; Ferry, Kristen H.; Deegan, Linda A.; Nelson, Gary A. (U.S. Dept. of Commerce, NOAA NMFS, 2009-07)For most migratory fish, little is known about the location and size of foraging areas or how long individuals remain in foraging areas, even though these attributes may affect their growth, survival, and impact on ...
Markov Chain Monte Carlo methods for assigning larvae to natal sites using natural geochemical tags White, J. Wilson; Standish, Julie D.; Thorrold, Simon R.; Warner, Robert R. (Ecological Society of America, 2008-12)Geochemical signatures deposited in otoliths are a potentially powerful means of identifying the origin and dispersal history of fish. However, current analytical methods for assigning natal origins of fish in mixed-stock ...