The current status of elasmobranchs: biology, fisheries and conservation

White, William T.; Blaber, S. J. M.; Craig, J. F.

doi:10.1111/j.1095-8649.2012.03268.x

Cited by 19 publications

(9 citation statements)

References 33 publications

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“…Sharks share a number of biological characteristics that make them susceptible to over-utilisation [3], but the status of populations on Chatham Rise is unknown [2], [4]. Of the squaliforme shark species commonly caught by deep water (>400 m) research bottom trawls on Chatham Rise, Proscymnodon plunketi and Dalatias licha are listed by the IUCN as “near threatened”, and Squalus acanthias and Centrophorus squamosus are listed as “vulnerable”; the other seven commonly caught species, Centroscymnus owstoni , Centroselachus crepidater , Deania calcea , Etmopterus baxteri , Etmopterus lucifer , Oxynotus bruniensis and Squalus griffini , are listed as “least concern” or “data deficient”.…”

Section: Introductionmentioning

confidence: 99%

Trophic Interactions and Distribution of Some Squaliforme Sharks, Including New Diet Descriptions for Deania calcea and Squalus acanthias

et al. 2013

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Squaliforme sharks are a common but relatively vulnerable bycatch in many deep water fisheries. Eleven species of squaliforme shark are commonly caught at depths of 200–1200 m on Chatham Rise, New Zealand, and their diversity suggests they might occupy different niches. The diets of 133 Deania calcea and 295 Squalus acanthias were determined from examination of stomach contents. The diet of D. calcea was characterised by mesopelagic fishes, and S. acanthias by benthic to pelagic fishes, but was more adaptive and included likely scavenging. Multivariate analyses found the most important predictors of diet variability in S. acanthias were year, bottom temperature, longitude, and fish weight. The diet of the nine other commonly caught squaliforme sharks was reviewed, and the spatial and depth distribution of all species on Chatham Rise described from research bottom trawl survey catches. The eleven species had a variety of different diets, and depth and location preferences, consistent with niche separation to reduce interspecific competition. Four trophic groups were identified, characterised by: mesopelagic fishes and invertebrates (Centroselachus crepidater, D. calcea, and Etmopterus lucifer); mesopelagic and benthopelagic fishes and invertebrates (Centroscymnus owstoni, Etmopterus baxteri); demersal and benthic fishes (Centrophorus squamosus, Dalatias licha, Proscymnodon plunketi); and a generalist diet of fishes and invertebrates (S. acanthias). The trophic levels of the species in each of the four groups were estimated as 4.18–4.24, 4.20–4.23, 4.24–4.48, and 3.84 respectively. The diet of Oxynotus bruniensis and Squalus griffini are unknown. The different niches occupied by different species are likely to influence their vulnerability to bottom trawl fisheries. Some species may benefit from fisheries through an increased availability of scavenged prey.

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Section: Introductionmentioning

confidence: 99%

Trophic Interactions and Distribution of Some Squaliforme Sharks, Including New Diet Descriptions for Deania calcea and Squalus acanthias

et al. 2013

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“…Chondrichthyan systematics and taxonomy has gone through a recent upsurge in new species discovery [2,3], although a factor that may soon hamper the endeavour of describing Chondrichthyan biodiversity could be the trend towards local extinction of species in this phylum [4]. This is especially crucial in poorly-surveyed, species-rich regions of the world like the Indo-Malay-Papua archipelago [2,5,6], where fishing is mostly unregulated and vulnerable Chondrichthyan populations are unmonitored [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Himantura tutul sp. nov. (Myliobatoidei: Dasyatidae), a new ocellated whipray from the tropical Indo-West Pacific, described from its cytochrome-oxidase I gene sequence

Borsa

Durand

Shen

et al. 2013

Comptes Rendus. Biologies

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It has been previously established that the Leopard Whipray, Himantura leoparda, consists of two genetically isolated, cryptic species, provisionally designated as 'Cluster 1' and 'Cluster 4' (Arlyza et al., Mol. Phylogenet. Evol. 65 (2013) [1]). Here, we show that the two cryptic species differ by the spotting patterns on the dorsal surface of adults: Cluster-4 individuals tend to have larger-ocellated spots, which also more often have a continuous contour than Cluster-1 individuals. We show that H. leoparda's holotype has the typical larger-ocellated spot pattern, designating Cluster 4 as the actual H. leoparda. The other species (Cluster 1) is described as Himantura tutul sp. nov. on the basis of the nucleotide sequence of a 655-base pair fragment of its cytochrome-oxidase I gene (GenBank accession No. JX263335). Nucleotide synapomorphies at this locus clearly distinguish H. tutul sp. nov. from all three other valid species in the H. uarnak species complex, namely H. leoparda, H. uarnak, and H. undulata. H. tutul sp. nov. has a wide distribution in the Indo-West Pacific, from the shores of eastern Africa to the Indo-Malay archipelago. H. leoparda under its new definition has a similarly wide Indo-West Pacific distribution.

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“…Deep-water sharks are widely distributed and can be locally abundant in deep-sea habitats around the world, including in the northern and eastern Gulf of Mexico (Castro, 2011). Though no deep-water fisheries currently exist in the Gulf of Mexico, because sharks possess a number of biological attributes that make them vulnerable to overfishing (White et al, 2012), they could be negatively affected should these activities be initiated (Kyne and Simpfendorfer, 2010). Indeed deep-water sharks tend to be particularly slow to mature and have relatively low reproductive rates and many populations experience intensive harvesting from both directed fisheries and as bycatch (reviewed in Nicholas and Robyn, 2010).…”

Section: Introductionmentioning

confidence: 98%

Trophic interactions of common elasmobranchs in deep-sea communities of the Gulf of Mexico revealed through stable isotope and stomach content analysis

Churchill

Heithaus

Vaudo

et al. 2015

Deep Sea Research Part II: Topical Studies in Oceanography

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The current status of elasmobranchs: biology, fisheries and conservation

Cited by 19 publications

References 33 publications

Trophic Interactions and Distribution of Some Squaliforme Sharks, Including New Diet Descriptions for Deania calcea and Squalus acanthias

Trophic Interactions and Distribution of Some Squaliforme Sharks, Including New Diet Descriptions for Deania calcea and Squalus acanthias

Himantura tutul sp. nov. (Myliobatoidei: Dasyatidae), a new ocellated whipray from the tropical Indo-West Pacific, described from its cytochrome-oxidase I gene sequence

Trophic interactions of common elasmobranchs in deep-sea communities of the Gulf of Mexico revealed through stable isotope and stomach content analysis

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