Low genetic diversity and population structure of the narrownose shark (Mustelus schmitti)

Pereyra, Silvana; García, Graciela; Miller, Philip; Oviedo, Sebastián; Domingo, Andrés

doi:10.1016/j.fishres.2010.09.022

Cited by 32 publications

(32 citation statements)

References 44 publications

(50 reference statements)

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“…Values below branch nodes refer to highest posterior probability of occurrence for clades. The bar below summarize the time-scale divergence dates assuming a synonymous, per-site divergence rate of 0.0414/million years according to Pereyra et al (2010). results presented here indicate that M. schmitti exists as a single demographic unit in the Río de la Plata and its Maritime Front.…”

Section: Endemics Benthic and Pelagic Coastal Sharksmentioning

confidence: 77%

“…This species is distributed from Río de Janeiro (Brazil) to Patagonia in Argentina (Chiaramonte & Pettovello, 2000). Pereyra et al (2010) have used mitochondrial cyt-b gene sequences to examine the genetic structure of the narrownose smooth-hound populations within the Río de la Plata and its Maritime Front in the SW Atlantic Ocean. They found no evidence for genetic structure in the analyzed samples.…”

Section: Endemics Benthic and Pelagic Coastal Sharksmentioning

confidence: 99%

See 1 more Smart Citation

Phylogeography from South-Western Atlantic Ocean: Challenges for the Southern Hemisphere

García¹

2012

Current Topics in Phylogenetics and Phylogeography of Terrestrial and Aquatic Systems

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Section: Endemics Benthic and Pelagic Coastal Sharksmentioning

confidence: 77%

Section: Endemics Benthic and Pelagic Coastal Sharksmentioning

confidence: 99%

Phylogeography from South-Western Atlantic Ocean: Challenges for the Southern Hemisphere

García¹

2012

Current Topics in Phylogenetics and Phylogeography of Terrestrial and Aquatic Systems

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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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“…The marine fauna of the shallow coastal waters and species dependent on estuaries were affected by the sea level variations, when estuarine habitats would have virtually disappeared and coastal habitats would be restricted to small enclaves, with many populations being eliminated (Grant & Bowen, 2006). Especially in temperate southwestern Atlantic variations in sea level has been recognized as the principal factor determining habitat modifications, with coastal species being fragmented on the continental shelf of South America (Sprechmann, 1978), with marked effects on the historical demography of estuarine and coastal marine fish species (Beheregaray et al, 2002;García et al, 2008García et al, , 2011, resulting in the successive expansion and retraction of populations, associated with fluctuations in climate (Anderson, 2007;Garcia et al, 2008;Pereira et al, 2009;Pereyra et al, 2010;Fernández Iriarte et al, 2011). However, comparative analyses of the southwestern Atlantic cannot provide an evaluation of the effects of Quaternary changes in sea level on the northern and northeastern Brazilian coast.…”

Section: Discussionmentioning

confidence: 99%

Early Pleistocene lineages of Bagre bagre (Linnaeus, 1766) (Siluriformes: Ariidae), from the Atlantic coast of South America, with insights into the demography and biogeography of the species

et al. 2016

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Coastal and marine environments are characterized by a lack of evident physical barriers or geographic isolation, and it may be difficult to understand how divergence can arise and be sustained in marine environments. The identification of 'soft' barriers is a crucial step towards the understanding of gene flow in marine environments. The marine catfishes of the family Ariidae are a demersal group with restricted migratory behavior, no pelagic larval stages, and mechanisms of larval retention, representing a potentially useful model for the understanding of historical processes of allopatric speciation in the marine environment. In the present study, two lineages of the Coco sea catfish, Bagre bagre, were recognized from their complete segregation at both mitochondrial and morphological levels. One lineage is distributed between Venezuela and the northern coast of Brazil, including the semiarid northeast coast, while the second lineage is found on the eastern coast of Brazil, including the humid northeast coast. Based on distribution area, habitats preference, and genetic variability, inferences are made in relation to biogeography and demography of lineages in Atlantic coast of South America.Ambientes marinhos costeiros são caracterizados pela falta de barreiras físicas evidentes e ausência de isolamento geográfico, sendo difícil compreender como diferentes linhagens podem surgir e ser mantidas nestes ambientes. A identificação de barreiras permeáveis é um passo importante para a compreensão do fluxo gênico em ambientes marinhos. Os bagres marinhos da família Ariidae são um grupo demersal, com mecanismos de retenção larval e sem comportamento migratório ou estágio larval pelágico, representando um grupo potencialmente útil para a compreensão de processos históricos de especiação alopátrica no ambiente marinho. No presente estudo, duas linhagens do bandeirado ou bagre de fita, Bagre bagre, são reconhecidas com base na completa segregação mitocondrial e morfológica. Uma linhagem é encontrada da Venezuela à costa norte do Brasil, incluindo a costa nordeste semi-árida, enquanto a segunda linhagem é encontrada na costa leste e sudeste do Brasil, incluindo a costa nordeste úmida. Com base na área de distribuição, habitat preferencial e a variabilidade genética, inferências são feitas em relação à biogeografia e demografia das duas linhagens na costa do Atlântico da América do Sul.

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Low genetic diversity and population structure of the narrownose shark (Mustelus schmitti)

Cited by 32 publications

References 44 publications

Phylogeography from South-Western Atlantic Ocean: Challenges for the Southern Hemisphere

Phylogeography from South-Western Atlantic Ocean: Challenges for the Southern Hemisphere

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

Early Pleistocene lineages of Bagre bagre (Linnaeus, 1766) (Siluriformes: Ariidae), from the Atlantic coast of South America, with insights into the demography and biogeography of the species

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