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Dispersal capacities of anadromous Allis shad population inferred from a coupled genetic and otolith approach.
- Source :
-
Canadian Journal of Fisheries & Aquatic Sciences . Jul2015, Vol. 72 Issue 7, p991-1003. 13p. 1 Color Photograph, 1 Diagram, 5 Charts, 1 Graph. - Publication Year :
- 2015
-
Abstract
- Understanding dispersal capacities for migratory species is crucial for their management. By coupling otolith microchemistry and microsatellite genetic analyses, we provided information on snapshot and long-term dispersal capacity of Allis shad ( Alosa alosa), an anadromous clupeid in decline throughout its distribution range. The allocation of natal origin was obtained from water chemistry and signatures in otoliths of juveniles and spawners within a Bayesian model. The majority of adults were assigned to a source river with high degrees of confidence; only 4% were undetermined. Otolith natal origins were used to define a population baseline by grouping individuals from the same natal river and not from the same sampling location as usually done. While A. alosa exhibited a high level of natal site fidelity, this species showed weak genetic structure, which supported the evidence of a substantial flow of strayers between river basins in the vicinity or at longer distances. However, long distance straying was probable but not frequent. In a context of global change, straying would be a key mechanism to drive dispersal and allow resilience of Allis shad populations. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0706652X
- Volume :
- 72
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Canadian Journal of Fisheries & Aquatic Sciences
- Publication Type :
- Academic Journal
- Accession number :
- 103386438
- Full Text :
- https://doi.org/10.1139/cjfas-2014-0510