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.
A deep seismic investigation of the Flemish Cap margin: implications for the origin of deep reflectivity and evidence for asymmetric break-up between Newfoundland and Iberia Hopper, John R.; Funck, Thomas; Tucholke, Brian E.; Louden, Keith E.; Holbrook, W. Steven; Larsen, Hans Christian (Blackwell Publishing, 2006-02-21)Seismic reflection and refraction data were acquired along the southeast margin of Flemish Cap at a position conjugate to drilling and geophysical surveys across the Galicia Bank margin. The data document first-order ...
New criteria for selecting the origin of DNA replication in Wolbachia and closely related bacteria Ioannidis, Panagiotis; Dunning Hotopp, Julie C.; Sapountzis, Panagiotis; Siozios, Stefanos; Tsiamis, Georgios; Bordenstein, Seth R.; Baldo, Laura; Werren, John H.; Bourtzis, Kostas (BioMed Central, 2007-06-20)Background: The annotated genomes of two closely related strains of the intracellular bacterium Wolbachia pipientis have been reported without the identifications of the putative origin of replication (ori). Identifying ...
Nature, origin, transport and deposition of andosol parent material in south-central Chile (36-42°S) Bertrand, Sebastien; Fagel, Nathalie (2007-07)The andosols of south-central Chile (36-42°S) are developed on yellow-brown loams that cover the region with a thickness of several meters. In the literature, several hypotheses concerning the nature, origin, mode of ...