Population structure of a deep-water squaloid shark, the Portuguese dogfish (Centroscymnus coelolepis)

Veríssimo, Ana; McDowell, Jan R.; Graves, John E.

doi:10.1093/icesjms/fsr003

Cited by 42 publications

(45 citation statements)

References 39 publications

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“…Centroscymnus coelolepis, also a benthopelagic shark, does not exhibit any deep genetic break in its Atlantic range [6]. It would be expected that a species sharing with C. crepidater an identical geographic distribution and food regime, would be similarly affected by the oceanic cooling observed during the Miocene, and would also display a deep mtDNA divergence.…”

Section: Discussionmentioning

confidence: 99%

Ancient Divergence in the Trans-Oceanic Deep-Sea Shark Centroscymnus crepidater

et al. 2012

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Unravelling the genetic structure and phylogeographic patterns of deep-sea sharks is particularly challenging given the inherent difficulty in obtaining samples. The deep-sea shark Centroscymnus crepidater is a medium-sized benthopelagic species that exhibits a circumglobal distribution occurring both in the Atlantic and Indo-Pacific Oceans. Contrary to the wealth of phylogeographic studies focused on coastal sharks, the genetic structure of bathyal species remains largely unexplored. We used a fragment of the mitochondrial DNA control region, and microsatellite data, to examine genetic structure in C. crepidater collected from the Atlantic Ocean, Tasman Sea, and southern Pacific Ocean (Chatham Rise). Two deeply divergent (3.1%) mtDNA clades were recovered, with one clade including both Atlantic and Pacific specimens, and the other composed of Atlantic samples with a single specimen from the Pacific (Chatham Rise). Bayesian analyses estimated this splitting in the Miocene at about 15 million years ago. The ancestral C. crepidater lineage was probably widely distributed in the Atlantic and Indo-Pacific Oceans. The oceanic cooling observed during the Miocene due to an Antarctic glaciation and the Tethys closure caused changes in environmental conditions that presumably restricted gene flow between basins. Fluctuations in food resources in the Southern Ocean might have promoted the dispersal of C. crepidater throughout the northern Atlantic where habitat conditions were more suitable during the Miocene. The significant genetic structure revealed by microsatellite data suggests the existence of present-day barriers to gene flow between the Atlantic and Pacific populations most likely due to the influence of the Agulhas Current retroflection on prey movements.

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Section: Discussionmentioning

confidence: 99%

Ancient Divergence in the Trans-Oceanic Deep-Sea Shark Centroscymnus crepidater

et al. 2012

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“…The Portuguese dogfish Centroscymnus coelolepis Barbosa du Bocage & de Brito Capello 1864 showed no evidence of genetic population structure (mtDNA CR and eight microsatellite loci) among collection sites in the eastern Atlantic Ocean. High dispersal potential of this species as well as no major barriers to dispersal within the eastern Atlantic Ocean were thought to explain the lack of differentiation (Veríssimo et al , 2011 a ).…”

Section: Phylogeography and Population Structure In Elasmobranchsmentioning

confidence: 99%

A review of the application of molecular genetics for fisheries management and conservation of sharks and rays

Dudgeon

Blower

Broderick

et al. 2012

Journal of Fish Biology

204

202

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Since the first investigation 25 years ago, the application of genetic tools to address ecological and evolutionary questions in elasmobranch studies has greatly expanded. Major developments in genetic theory as well as in the availability, cost effectiveness and resolution of genetic markers were instrumental for particularly rapid progress over the last 10 years. Genetic studies of elasmobranchs are of direct importance and have application to fisheries management and conservation issues such as the definition of management units and identification of species from fins. In the future, increased application of the most recent and emerging technologies will enable accelerated genetic data production and the development of new markers at reduced costs, paving the way for a paradigm shift from gene to genome-scale research, and more focus on adaptive rather than just neutral variation. Current literature is reviewed in six fields of elasmobranch molecular genetics relevant to fisheries and conservation management (species identification, phylogeography, philopatry, genetic effective population size, molecular evolutionary rate and emerging methods). Where possible, examples from the Indo-Pacific region, which has been underrepresented in previous reviews, are emphasized within a global perspective.

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“…Deep‐water dogfishes are known to segregate by sex, size and reproductive stage across depths and geographic areas (Yano & Tanaka, 1988; Machado & Figueiredo, 2000), and these patterns can be further complicated by seasonal changes (Veríssimo et al , 2011). In order for a population to remain viable, continued breeding success is essential.…”

Section: Introductionmentioning

confidence: 99%

Biological vulnerability of two exploited sharks of the genus Deania (Centrophoridae)

Irvine

Daley

Graham

et al. 2012

Journal of Fish Biology

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Life-history parameters of Deania calcea and Deania quadrispinosa suggested that their productivity was very low. Maturity (L(T50) ) occurs at c. 80% of maximum observed total lengths (L(T) ) for both species and sexes. A large proportion of mature females were neither pre-ovulatory nor pregnant, and the reproductive cycle included a distinct resting phase after pregnancy. For D. calcea, mean ovarian fecundity was 12 and maximum observed litter size was 10 (average of six); D. quadrispinosa averaged 17 pups per litter. Birth L(T) was 28-33 cm for D. calcea and 23-25 cm for D. quadrispinosa. The male and female reproductive cycles were aseasonal, and consequently, the length of the reproductive cycle could not be determined. Preliminary ageing data from dorsal-spine growth bands suggested that female D. calcea lived to 31-36 years and males to 24-32 years. The L(T) -at-age data using external bands on the spines showed maturity occurring at 15·5 years (males) and 21·5 years (females), whereas banding on the internal dentine indicated maturity at 10·5 and 17·5 years for males and females. Thus, a female lifetime of 31-36 years allowed for a maximum of 7 litters if a 2 year cycle is assumed or only five litters with a 3 year cycle, resulting in a lifetime fecundity of only 42 pups (2 year cycle) or even lower (3 year cycle).

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Population structure of a deep-water squaloid shark, the Portuguese dogfish (Centroscymnus coelolepis)

Cited by 42 publications

References 39 publications

Ancient Divergence in the Trans-Oceanic Deep-Sea Shark Centroscymnus crepidater

Ancient Divergence in the Trans-Oceanic Deep-Sea Shark Centroscymnus crepidater

A review of the application of molecular genetics for fisheries management and conservation of sharks and rays

Biological vulnerability of two exploited sharks of the genus Deania (Centrophoridae)

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