Population genetics of the nurse shark (Ginglymostoma cirratum) in the western Atlantic

Karl, Stephen A.; Castro, Alessandra Maia de; Garla, Ricardo C.

doi:10.1007/s00227-011-1828-y

Cited by 54 publications

(56 citation statements)

References 45 publications

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“…The nurse shark (Ginglymastoma cirratum) is another common shallow water benthic elasmobranch with both mainland and offshore island populations. Analysis of nurse shark population structure has revealed pronounced divergence between mainland and island populations, suggesting that deep water is indeed acting as a barrier to dispersal (Karl et al, 2011). This supports our hypothesis that leopard sharks will have significant structuring between mainland and island populations.…”

Section: Introductionsupporting

confidence: 81%

Genetic structure of leopard shark (Triakis semifasciata) populations along the Pacific coast of North America

Barker

2015

Journal of Experimental Marine Biology and Ecology

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Section: Introductionsupporting

confidence: 81%

Genetic structure of leopard shark (Triakis semifasciata) populations along the Pacific coast of North America

Barker

2015

Journal of Experimental Marine Biology and Ecology

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“…In contrast, in the western Mediterranean there was significant divergence between the sample collections from the Balearic Islands and the Algerian Basin (F ST = 0.032), which are o300 km apart but are separated by the Balearic Abyssal Plain. The effect of deep marine basins as a barrier to dispersal has also been demonstrated for other demersal chondrichthyans, such as the nurse shark, between the Brazilian coast and the offshore islands (Karl et al, 2012), and the thornback ray, between the European continental shelf and the Azores (Chevolot et al, 2006).…”

Section: Discussionmentioning

confidence: 76%

“…For example, large, oceanodromous species, such as the shortfin mako, Isurus oxyrinchus (Schrey and Heist, 2003) and the basking shark, Cetorhinus maximus (Hoelzel et al, 2006), exhibited genetic homogeneity across ocean basins. On the other hand, strong genetic structure was observed in less vagile, demersal species, such as the nurse shark, Ginglymostoma cirratum (Karl et al, 2012) and the whitetip reef shark, Triaenodon obesus (Whitney et al, 2012). Nonetheless, strong genetic structure has been reported even in highly vagile species, being attributed either to site fidelity, as for the sandbar shark, Carcharhinus plumbeus (Portnoy et al, 2010) or to environmental barriers, as for the spiny dogfish Squalus acanthias (Verissimo et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Strong population genetic structure and contrasting demographic histories for the small-spotted catshark (Scyliorhinus canicula) in the Mediterranean Sea

et al. 2014

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Coastal and demersal chondrichthyans, such as the small-spotted catshark, are expected to exhibit genetic differentiation in areas of complex geomorphology like the Mediterranean Basin because of their limited dispersal ability. To test this hypothesis, we used a fragment of the mitochondrial cytochrome c oxidase subunit I gene and 12 nuclear microsatellite loci in order to investigate the genetic structure and historical demography of this species, and to identify potential barriers to gene flow. Samples were collected from the Balearic Islands, the Algerian Basin, the Ionian Sea, the Corinthian Gulf and various locations across the Aegean Sea. Additional sequences from the Atlantic and the Levantine Basin retrieved from GenBank were included in the mitochondrial DNA analysis. Both mitochondrial and nuclear microsatellite DNA data revealed a strong genetic subdivision, mainly between the western and eastern Mediterranean, whereas the Levantine Basin shared haplotypes with both areas. The geographic isolation of the Mediterranean basins seems to enforce the population genetic differentiation of the species, with the deep sea acting as a strong barrier to its dispersal. Contrasting historical demographic patterns were also observed in different parts of the species' distribution, most notably a population growth trend in the western Mediterranean/ Atlantic area and a slight decreasing one in the Aegean Sea. The different effects of the Pleistocene glacial periods on the habitat availability may explain the contrasting demographic patterns observed. The current findings suggest that the smallspotted catshark exhibits several genetic stocks in the Mediterranean, although further study is needed.

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“…brevipinna is unprecedented among sharks, with comparable signals more commonly associated with taxa such as humans [2] and teleost fishes [6,97,98]. Evidence for population expansion has, however, been presented for some shark species through analyses of mismatch distributions [8,99], star-like haplotype networks [40,100,101], or combinations of the latter two supported by neutrality indices [102,103]. …”

Section: Discussionmentioning

confidence: 99%

Population Expansion and Genetic Structure in Carcharhinus brevipinna in the Southern Indo-Pacific

et al. 2013

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BackgroundQuantifying genetic diversity and metapopulation structure provides insights into the evolutionary history of a species and helps develop appropriate management strategies. We provide the first assessment of genetic structure in spinner sharks (Carcharhinus brevipinna), a large cosmopolitan carcharhinid, sampled from eastern and northern Australia and South Africa.Methods and FindingsSequencing of the mitochondrial DNA NADH dehydrogenase subunit 4 gene for 430 individuals revealed 37 haplotypes and moderately high haplotype diversity (h = 0.6770 ±0.025). While two metrics of genetic divergence (ΦST and F ST) revealed somewhat different results, subdivision was detected between South Africa and all Australian locations (pairwise ΦST, range 0.02717–0.03508, p values ≤ 0.0013; pairwise F ST South Africa vs New South Wales = 0.04056, p = 0.0008). Evidence for fine-scale genetic structuring was also detected along Australia’s east coast (pairwise ΦST = 0.01328, p < 0.015), and between south-eastern and northern locations (pairwise ΦST = 0.00669, p < 0.04).ConclusionsThe Indian Ocean represents a robust barrier to contemporary gene flow in C. brevipinna between Australia and South Africa. Gene flow also appears restricted along a continuous continental margin in this species, with data tentatively suggesting the delineation of two management units within Australian waters. Further sampling, however, is required for a more robust evaluation of the latter finding. Evidence indicates that all sampled populations were shaped by a substantial demographic expansion event, with the resultant high genetic diversity being cause for optimism when considering conservation of this commercially-targeted species in the southern Indo-Pacific.

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Population genetics of the nurse shark (Ginglymostoma cirratum) in the western Atlantic

Cited by 54 publications

References 45 publications

Genetic structure of leopard shark (Triakis semifasciata) populations along the Pacific coast of North America

Genetic structure of leopard shark (Triakis semifasciata) populations along the Pacific coast of North America

Strong population genetic structure and contrasting demographic histories for the small-spotted catshark (Scyliorhinus canicula) in the Mediterranean Sea

Population Expansion and Genetic Structure in Carcharhinus brevipinna in the Southern Indo-Pacific

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