Hexanchus griseus is a globally distributed deep-water shark species. It inhabits tropical and temperate waters throughout the world, including the Mediterranean Sea where it is by-caught by small-scale fisheries in the region. In this study, we analysed the genetic variation of H. griseus specimens collected from different areas within and outside the Mediterranean region, to assess its genetic connectivity. The mitochondrial DNA (mtDNA) sequence analysed in this study ranged from cytochrome b to 16S rRNA genes including the control region, the 12S rRNA gene and the interspersed tRNA genes in the region, covering a total of 3731 to 3914 nucleotides. Results have shown that this species exhibits geographically distinct maternal lineages, indicating population structure along geographical ranges. These findings reveal population subdivisions not only between the Pacific Ocean and the Atlantic Ocean, but also within the oceans and on a smaller scale within the Mediterranean Sea. This highlights the need to consider each population subdivision separately when designing management plans for the conservation of this species.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.margen.2017.05.012 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
The bluntnose sixgill shark () is a wide-ranged deep-water shark species found off continental and insular shelves. Despite its global distribution, little is known about the reproductive ecology of the species, particularly with regard to the location and timing of important phenological events such as mating and pupping. In this study, we report the landing of a neonate individual from an artisanal fishing camp in Baja California Sur, Mexico.
View Article and Find Full Text PDFUnique hepatic maternal transfer pattern of trace metals and perfluoroalkyl substances (PFAS) in a bluntnose sixgill shark (Hexanchus griseus).
Chemosphere
July 2024
Applied Environmental Research Laboratories (AERL), Department of Chemistry, Vancouver Island University, Nanaimo, V9R 5S5, British Columbia, Canada; Department of Chemistry, University of Victoria, Victoria, V8P 5C2, British Columbia, Canada. Electronic address:
The fate and distribution of environmental contaminants includes bioaccumulation within marine organisms. A deceased 4-m long adult female bluntnose sixgill shark, pregnant with 72 pups, was recovered from Coles Bay on Vancouver Island, BC, Canada in 2019. This specimen provided a unique opportunity to examine maternal transfer of contaminants in a yolk-sac viviparous shark species.
View Article and Find Full Text PDFIntegrative taxonomy of metazoan parasites of the bluntnose sixgill shark Hexanchus griseus (Bonnaterre, 1788) in the Mediterranean Sea, with the resurrection of Grillotia acanthoscolex Rees, 1944 (Cestoda: Trypanorhyncha).
J Fish Biol
June 2024
Department of Integrative Marine Ecology, Stazione Zoologica Anton Dohrn, Naples, Italy.
Appropriate diagnoses of parasites of apex marine predators are crucial to understand their biodiversity, host specificity, biogeography, and life cycles. Such diagnoses are also informative of ecological and biological characteristics of both host and environment in which the hosts and their parasites live. We here (i) investigate the parasite fauna of a bluntnose sixgill shark Hexanchus griseus (Bonnaterre, 1788) obtained from the Gulf of Naples (Tyrrhenian Sea), (ii) characterize molecularly all its metazoan parasites, and (iii) resurrect and report the main morphological features and phylogenetic position of Grillotia acanthoscolex, a cestode species previously synonymized with Grillotia adenoplusia.
View Article and Find Full Text PDFHelminths of the Bluntnose Sixgill Shark, (Bonnaterre, 1788), from the Strait of Messina (Sicily, Southern Italy).
Animals (Basel)
July 2023
Department of Veterinary Sciences, University of Messina, 98168 Messina, Italy.
Bluntnose sixgill shark, (Bonnaterre, 1788), is a little-known elasmobranch in the Mediterranean Sea. Given the lack of information about , the aim of our study was to describe the helminth fauna of this species. In March 2023, one juvenile female specimen was found off the coast of Messina (Italy) and referred by the Italian Coast Guard to our laboratory for necropsy and parasitological evaluation.
View Article and Find Full Text PDFDistribution and New Records of the Bluntnose Sixgill Shark, (Hexanchiformes: Hexanchidae), from the Tropical Southwestern Atlantic.
Animals (Basel)
December 2022
Departamento de Pesca e Aquicultura, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, Universidade Federal Rural de Pernambuco-UFRPE, Recife 52171-900, Brazil.
The bluntnose sixgill shark, , is a widely distributed demersal species found in tropical and temperate waters of the Pacific, Atlantic, and Indian Oceans, inhabiting continental shelves and slopes, islands, and mid-ocean ridges at depths ranging from 200 to 1100 m. In the Southwestern Atlantic, this species has been recorded from northeastern to southern Brazil, Argentina, and Uruguay. Despite this, the known distribution of this species in the Southwestern Atlantic is very patchy and, in some cases, still mostly ignored in the literature, such as in northeastern Brazil.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!