Open AccessIsolation by oceanic distance and spatial genetic structure in an overharvested international fishery
Author(s) -
Truelove Nathan K.,
Box Stephen J.,
Aiken Karl A.,
BlytheMallett Azra,
Boman Erik M.,
Booker Catherine J.,
Byfield Tamsen T.,
Cox Courtney E.,
Davis Martha H.,
Delgado Gabriel A.,
Glazer Bob A.,
Griffiths Sarah M.,
KitsonWalters Kimani,
Kough Andy S.,
Pérez Enríquez Ricardo,
Preziosi Richard F.,
Roy Marcia E.,
SeguraGarcía Iris,
Webber Mona K.,
Stoner Allan W.
Publication year - 2017
Publication title -
diversity and distributions
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.918
H-Index - 118
eISSN - 1472-4642
pISSN - 1366-9516
DOI - 10.1111/ddi.12626
Subject(s) - isolation by distance , panmixia , genetic structure , gene flow , geography , population , genetic diversity , ecology , geographical distance , fishery , caribbean region , fisheries management , biology , fishing , latin americans , demography , linguistics , philosophy , sociology
Aim A detailed understanding of spatial genetic structure ( SGS ) and the factors driving contemporary patterns of gene flow and genetic diversity are fundamental for developing conservation and management plans for marine fisheries. We performed a detailed study of SGS and genetic diversity throughout the overharvested queen conch ( Lobatus gigas ) fishery. Caribbean countries were presented as major populations to examine transboundary patterns of population differentiation. Location Nineteen locations in the greater Caribbean from Anguilla, the Bahamas, Belize, Caribbean Netherlands, Honduras, Jamaica, Mexico, Turks and Caicos, and the USA . Methods We genotyped 643 individuals with nine microsatellites. Population genetic and multivariate analyses characterized SGS . We tested the alternate hypotheses: (1) SGS is randomly distributed in space or (2) pairwise genetic structure among sites is correlated with oceanic distance ( IBOD ). Results Our study found that L. gigas does not form a single panmictic population in the greater Caribbean. Significant levels of genetic differentiation were identified between Caribbean countries ( F CT = 0.011; p = .0001), within Caribbean countries ( F SC = 0.003; p = .001), and among sites irrespective of geographic location ( F ST = 0.013; p = .0001). Gene flow across the greater Caribbean was constrained by oceanic distance ( p = .0009; Mantel r = .40), which acted to isolate local populations. Main conclusions Gene flow over the spatial scale of the entire Caribbean basin is constrained by oceanic distance, which may impede the natural recovery of overfished L. gigas populations. Our results suggest a careful blend of local and international management will be required to ensure long‐term sustainability for the species.