Effective size closely approximates the census size in the heavily exploited western Atlantic population of the sandbar shark, Carcharhinus plumbeus

The sandbar shark, Carcharhinus plumbeus, is a long-lived species with low lifetime fecundity that is heavily fished in the western North Atlantic. Inshore nursery grounds increase survivorship of sandbar shark pups and the principal nurseries are in the mid-Atlantic region. We calculated effective...

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Bibliographic Details
Published in:Conservation genetics Vol. 10; no. 6; pp. 1697 - 1705
Main Authors: Portnoy, David S, McDowell, Jan R, McCandless, Camilla T, Musick, John A, Graves, John E
Format: Journal Article
Language:English
Published: Dordrecht Dordrecht : Springer Netherlands 01.12.2009
Springer Netherlands
Springer Nature B.V
Subjects:
adults
Animal Genetics and Genomics
Animal reproduction
Biodiversity
Biomedical and Life Sciences
Carcharhinus
Census
Conservation Biology/Ecology
Delaware
Ecology
Estimating techniques
Evolutionary Biology
Fecundity
Fish populations
Genotype & phenotype
Life Sciences
mammals
Marine biology
Marine fish
microsatellite repeats
Nursery grounds
Plant Genetics and Genomics
Population number
population size
pups
Research Article
Sand bars
Sharks
survival rate
Virginia
United States > US
Atlantic Ocean
Delaware
Virginia
Microsatellites
Effective population size
Elasmobranchs
Linkage disequilibrium
Temporal method
Effective number of breeders
ISSN:1566-0621, 1572-9737
Online Access:Get full text
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Summary:The sandbar shark, Carcharhinus plumbeus, is a long-lived species with low lifetime fecundity that is heavily fished in the western North Atlantic. Inshore nursery grounds increase survivorship of sandbar shark pups and the principal nurseries are in the mid-Atlantic region. We calculated effective number of breeders (Nb) and effective population size (Ne) for adults utilizing the nursery grounds of the Delaware Bay and the Eastern Shore of Virginia by genotyping 902 animals across five cohorts at eight microsatellite loci. Estimates of Nb and Ne were compared to estimates of census size (Nc) of cohorts obtained from Delaware Bay. The estimated Ne/Nc and Nb/Nc ratios were 0.45 or higher whether the Delaware Bay cohorts were considered as distinct year classes or combined. This is in contrast to estimated Ne/Nc ratios in other exploited marine fishes, which are several orders of magnitude smaller. Instead, the Ne/Nc ratio of sandbar sharks is similar to that found in marine and terrestrial mammals.
Bibliography:http://dx.doi.org/10.1007/s10592-008-9771-2
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ISSN:1566-0621
1572-9737
DOI:10.1007/s10592-008-9771-2