Pleistocene glaciation events shape genetic structure across the range of the American lobster, <i>Homarus americanus</i>

Kenchington, Ellen; Harding, Gareth; Jones, Mathew W.; Prodöhl, Paulo A.

doi:10.1111/j.1365-294x.2009.04118.x

Cited by 44 publications

(51 citation statements)

References 73 publications

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“…One recent example is the determination of population structure in H. americanus, the nearest relative of H. gammarus. Kenchington et al (2009) used 13 microsatellites to assess population structure in H. americanus, identifying 2 population clusters, divided into the northern and southern portions of the species' range. Since then, Benestan et al (2015) confirmed this broad-scale divergence using > 8000 neutral single nucleotide polymorphisms, but also discovered robust evidence for IBD and hierarchical fine-scale differentiation.…”

Section: Methodological Power and Resolutionmentioning

confidence: 99%

Population genetic structure in European lobsters: implications for connectivity, diversity and hatchery stocking

Ellis¹,

Hodgson²,

Daniels³

et al. 2017

Mar. Ecol. Prog. Ser.

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The European lobster Homarus gammarus is a marine crustacean prized for seafood, but populations across its range are threatened by fishery overexploitation. The species' larval stages are planktonic, suggesting considerable dispersal among populations. The potential threats of overexploitation and erosion of population structure due to hatchery releases or inadvertent introductions make it important to understand the genetic structuring of populations across multiple geographic scales. Here we assess lobster population structure at a fine scale in Cornwall, southwestern UK, where a hatchery-stocking operation introduces cultured individuals into the wild stock, and at a broader European level, in order to compare the spatial scale of hatchery releases with that of population connectivity. Microsatellite genotypes of 24 individuals from each of 13 locations in Cornwall showed no fine-scale population structure across distances of up tõ 230 km. Significant differentiation and isolation by distance were detected at a broader scale, using 300 additional individuals comprising a further 15 European samples. Signals of genetic heterogeneity were evident between an Atlantic cluster and samples from Sweden. Connectivity within the Atlantic and Swedish clusters was high, although evidence for isolation by distance and a transitional zone within the eastern North Sea suggested that direct gene exchange between these stocks is limited and fits a stepping-stone model. We conclude that hatchery-reared lobsters should not be released where broodstock are distantly sourced but, using Cornwall as a case study, microsatellites revealed no evidence that the normal release of hatchery stock exceeds the geographic scale of natural connectivity.

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Section: Methodological Power and Resolutionmentioning

confidence: 99%

Population genetic structure in European lobsters: implications for connectivity, diversity and hatchery stocking

Ellis¹,

Hodgson²,

Daniels³

et al. 2017

Mar. Ecol. Prog. Ser.

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“…Landscape genetic analysis has been increasingly successfully used to identify spatial patterns of genetic structure and possible regions of discontinuous gene flow in both terrestrial and marine studies (Miller et al 2006, Kenchington et al 2009). These analyses are based on statistical procedures that rely primarily on patterns of interindividual genetic and geographical variation (see Manel et al 2003 for a review).…”

Section: Methodsmentioning

confidence: 99%

Understanding marine reserve function in a seascape genetics context: Nucella lapillus in Strangford Lough (Northern Ireland) as an example

McInerney¹,

Allcock²,

Johnson³

et al. 2009

Aquat. Biol.

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A conservation priority in the marine environment is the establishment of ecologically coherent reserve networks. Since these networks will integrate existent reserves, an understanding of spatial genetic diversity and genetic connectivities between areas is necessary. Using Strangford Lough marine nature reserve (MNR) as a model, spatial genetic analyses were employed to evaluate the function of the lough. Samples of the marine gastropod Nucella lapillus (L.) from 7 locations in the reserve and adjacent areas were screened at 6 microsatellites. Genetic variation was temporally stable. Significant genetic structuring (F ST = 0.133) was observed among samples. Genetic divergence and isolation by distance indicated reduced gene flow between the marine reserve and coastal samples relative to that between adjacent coastal samples. Partitioning of genetic variation between the reserve and coast was significant (AMOVA, 7.45%, p < 0.005). Samples within the reserve were not homogeneous, and genetic diversity decreased away from the mouth of the lough. Relative genetic isolation and reduced genetic diversity in the reserve may be caused by hydrographic barriers. A cline in genetic structure was observed in the Irish Sea. This is consistent with patterning of gene flow by predominant currents, habitat availability and seasonal oceanographic features. It appears that mesoscale topographic and hydrographic features drive patterns of genetic diversity, and these factors are likely to be important for understanding MNR function. For direct developers lacking a planktonic phase, such as N. lapillus, considerations of the ecological coherence of a network are likely to be highly dependent on the habitat lying outside reserves.

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“…Additionally, Nova Scotia separates warmer shallow waters in the Gulf of St. Lawrence from the cold waters of the Labrador Current, providing refugia for many marine coastal species (Bousfield and Thomas 1975). The boundaries between these biogeographic provinces are filters to gene flow in many western North Atlantic species, including amphipods (Jones 2005; Kelly et al 2006), polychaetes (Jennings et al 2009), and lobster (Kenchington et al 2009) through limits to larval dispersal, recruitment, adult survival, or adult habitat choice. However, despite the apparent strength of these environmental filters, they are largely invisible to others species such as weakfish (Cordes and Graves 2003), bivalves (Dahlgren et al 2000; Hare and Weinberg 2005; Strasser and Barber 2008), and other gastropods (Collin 2001) (see Wares 2002 for review).…”

Section: Introductionmentioning

confidence: 99%

Regional differentiation and post-glacial expansion of the Atlantic silverside, Menidia menidia, an annual fish with high dispersal potential

et al. 2010

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The coastal marine environment of the Northwest Atlantic contains strong environmental gradients that create distinct marine biogeographic provinces by limiting dispersal, recruitment, and survival. This region has also been subjected to numerous Pleistocene glacial cycles, resulting in repeated extirpations and recolonizations in northern populations of marine organisms. In this study, we examined patterns of genetic structure and historical demography in the Atlantic silverside, Menidia menidia, an annual marine fish with high dispersal potential but with well-documented patterns of clinal phenotypic adaptation along the environmental gradients of the Northwest Atlantic. Contrary to previous studies indicating genetic homogeneity that should preclude regional adaptation, results demonstrate subtle but significant (FST = 0.07; P < 0.0001) genetic structure among three phylogeographic regions that partially correspond with biogeographic provinces, suggesting regional limits to gene flow. Tests for non-equilibrium population dynamics and latitudinal patterns in genetic diversity indicate northward population expansion from a single southern refugium following the last glacial maximum, suggesting that phylogeographic and phenotypic patterns have relatively recent origins. The recovery of phylogeographic structure and the partial correspondence of these regions to recognized biogeographic provinces suggest that the environmental gradients that shape biogeographic patterns in the Northwest Atlantic may also limit gene flow in M. menidia, creating phylogeographic structure and contributing to the creation of latitudinal phenotypic clines in this species.Electronic supplementary materialThe online version of this article (doi:10.1007/s00227-010-1577-3) contains supplementary material, which is available to authorized users.

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Pleistocene glaciation events shape genetic structure across the range of the American lobster, Homarus americanus

Cited by 44 publications

References 73 publications

Population genetic structure in European lobsters: implications for connectivity, diversity and hatchery stocking

Population genetic structure in European lobsters: implications for connectivity, diversity and hatchery stocking

Understanding marine reserve function in a seascape genetics context: Nucella lapillus in Strangford Lough (Northern Ireland) as an example

Regional differentiation and post-glacial expansion of the Atlantic silverside, Menidia menidia, an annual fish with high dispersal potential

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