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29 results for “Dipturus”
Population and seascape genomics of a critically endangered benthic elasmobranch, the blue skate Dipturus batis
<p>The blue skate (<em>Dipturus batis</em>) has a patchy distribution across the North-East Atlantic Ocean, largely restricted to occidental seas around the British Isles following fisheries-induced population declines and extirpations. The viability of remnant populations remains uncertain, and could be impacted by continued fishing and bycatch pressure and the projected impacts of climate change. We genotyped 503 samples of D. batis, obtained opportunistically from the widest available geographic range, across 6,350 single nucleotide polymorphisms (SNPs) using a reduced-representation sequencing approach. Genotypes were used to assess the species' contemporary population structure, estimate effective population sizes, and identify putative signals of selection in relation to environmental variables using a seascape genomics approach. We identified genetic discontinuities between inshore (British Isles) and offshore (Rockall and Faroe Island) populations, with differentiation most pronounced across the deep waters of the Rockall Trough. Effective population sizes were largest in the Celtic Sea and Rockall, but low enough to be of potential conservation concern among Scottish and Faroese sites. Among the 21 candidate SNPs under positive selection was one significantly correlated with environmental variables predicted to be affected by climate change, including bottom temperature, salinity, and pH. The paucity of well annotated elasmobranch genomes precluded us from identifying a putative function for this SNP. Nevertheless, our findings suggest that climate change could inflict a strong selective force upon remnant populations of D. batis, further constraining its already restricted habitat. Furthermore, the results provide fundamental insights on the distribution, behaviour, and evolutionary biology of D. batis in the North-East Atlantic that will be useful for the establishment of conservation actions for this and other critically endangered elasmobranchs.</p>
Population and seascape genomics of a critically endangered benthic elasmobranch, the blue skate Dipturus batis
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FIGURE 3 in Morphological and molecular evidence for a new species of longnose skate (Rajiformes: Rajidae: Dipturus) from Argentinean waters based on DNA barcoding
FIGURE 3. Geographic distribution of Dipturus argentinensis n. sp. based on material collected. Symbols represent more than one capture. Star indicates original locality of holotype.
FIGURE 2 in Morphological and molecular evidence for a new species of longnose skate (Rajiformes: Rajidae: Dipturus) from Argentinean waters based on DNA barcoding
FIGURE 2. Tail thorns of Dipturus argentinensis n. sp., immature male paratype (INIDEP 797, 617 mm TL) (A), Dipturus chilensis, immature female (INIDEP 547, 715 mm TL) (B), and Dipturus trachyderma, immature male (INIDEP 789, 1211 mm TL) (C).
FIGURE 1. Dipturus argentinensis n in Morphological and molecular evidence for a new species of longnose skate (Rajiformes: Rajidae: Dipturus) from Argentinean waters based on DNA barcoding
FIGURE 1. Dipturus argentinensis n. sp., holotype, INIDEP 793, 765 mm TL, juvenile male, off central Patagonian shelf, Argentina. a–dorsal view; b– ventral view.
FIGURE 10 in Dipturus amphispinus sp. nov., a new longsnout skate (Rajoidei: Rajidae) from the Philippines
FIGURE 10. Pelvic girdle of Dipturus amphispinus sp. nov: A, adolescent male holotype (PNM 15178, 657 mm TL), B, adult male paratype (CSIRO H 7416–01, 621 mm TL). Drawn from radiographs. Abbreviations: ilp—iliac process; obt—obturator foramina, prep—pre-pelvic process.
FIGURE 9 in Dipturus amphispinus sp. nov., a new longsnout skate (Rajoidei: Rajidae) from the Philippines
FIGURE 9. Lateral view of right clasper of Dipturus amphispinus sp. nov: adult male paratype (CSIRO H 7416–01, 621 mm TL, preserved). Abbreviations: cf—cleft, dl—distal lobe, hp—hypopyle, rh—rhipidion, sl—slit, st—sentinel, sh—shield, sp—spike.
FIGURE 8 in Dipturus amphispinus sp. nov., a new longsnout skate (Rajoidei: Rajidae) from the Philippines
FIGURE 8. Lateral view of dorsal and caudal fins of Dipturus amphispinus sp. nov., adolescent male holotype (PNM 15178, 657 mm TL, preserved).
FIGURE 11 in Dipturus amphispinus sp. nov., a new longsnout skate (Rajoidei: Rajidae) from the Philippines
FIGURE 11. Map of the collection sites of Dipturus amphispinus sp. nov near the Sulu Sea in the central/southern Philippines. Holotype—purple star; paratypes—purple dots; non-types (from image only)—red dot.
FIGURE 7 in Dipturus amphispinus sp. nov., a new longsnout skate (Rajoidei: Rajidae) from the Philippines
FIGURE 7. Thorns at midlength of tail in Dipturus amphispinus sp. nov: A, dorsal and B, lateral views of adolescent male holotype (PNM 15178, 657 mm TL, preserved); C, dorsal and D, lateral views of female paratype (SUML MMLM 018, 883 mm TL, preserved).
FIGURE 5 in Dipturus amphispinus sp. nov., a new longsnout skate (Rajoidei: Rajidae) from the Philippines
FIGURE 5. Dipturus amphispinus sp. nov., female paratype (SUML MMLM 018, 883 mm TL, preserved) showing the welldeveloped scapular thorns and the characteristic paired thorns in the lumbar region.
FIGURE 6 in Dipturus amphispinus sp. nov., a new longsnout skate (Rajoidei: Rajidae) from the Philippines
FIGURE 6. Oronasal region of the head of Dipturus amphispinus sp. nov: adolescent male holotype (PNM 15178, 657 mm TL, preserved) showing sensory pores, tooth bands and coloration.
FIGURE 4 in Dipturus amphispinus sp. nov., a new longsnout skate (Rajoidei: Rajidae) from the Philippines
FIGURE 4. Dipturus amphispinus sp. nov., adolescent male holotype (PNM 15178, 657 mm TL, preserved) showing snout, orbito-spiracular and nuchal regions.
FIGURE 3 in Dipturus amphispinus sp. nov., a new longsnout skate (Rajoidei: Rajidae) from the Philippines
FIGURE 3. Radiograph of the head of Dipturus amphispinus sp. nov., adult male paratype (CSIRO H 7416–01, 621 mm TL, preserved).
FIGURE 1 in Dipturus amphispinus sp. nov., a new longsnout skate (Rajoidei: Rajidae) from the Philippines
FIGURE 1. Dipturus amphispinus sp. nov., adolescent male holotype (PNM 15178, 657 mm TL, preserved): A, dorsal surface; B, ventral surface.
FIGURE 2 in Dipturus amphispinus sp. nov., a new longsnout skate (Rajoidei: Rajidae) from the Philippines
FIGURE 2. Dipturus amphispinus sp. nov., female paratype (SUML MMLM 018, 883 mm TL, preserved): A, dorsal surface; B, ventral surface.
FIGURE 3 in Redescription and taxonomic status of Dipturus chilensis (Guichenot, 1848), and description of Dipturus lamillai sp. nov. (Rajiformes: Rajidae), a new species of long-snout skate from the Falkland Islands
FIGURE 3. Adult specimens of Dipturus chilensis: (A, C) Dorsal view of head and oro-nasal area, respectively, of male neotype (MNHNCL ICT 7549; CHL-88). (B, D) Dorsal view of head and oro-nasal area, respectively, of female voucher (MNHNCL ICT 7550; CHL-89).
FIGURE 11 in Redescription and taxonomic status of Dipturus chilensis (Guichenot, 1848), and description of Dipturus lamillai sp. nov. (Rajiformes: Rajidae), a new species of long-snout skate from the Falkland Islands
FIGURE 11. Adult specimen of female paratype (MNHNCL ICT 7532; FA-47) of Dipturus lamillai sp. nov.: Dorsal view of posterior angle of pectoral fins, and anterior and posterior lobes of pelvic fins. Thorns indicated with arrows. clt—caudal-lateral thorns, cct—caudal-central thorns, and ppt—posterior pectoral thorns.
FIGURE 10 in Redescription and taxonomic status of Dipturus chilensis (Guichenot, 1848), and description of Dipturus lamillai sp. nov. (Rajiformes: Rajidae), a new species of long-snout skate from the Falkland Islands
FIGURE 10. Adult specimens of Dipturus lamillai sp. nov.: (A) Dorsal and caudal fins of male holotype (MNHNCL ICT 7531; FA-46). (B) Dorsal and caudal fins of female paratype (MNHNCL ICT 7532; FA-47). (C, D) Left malar and alar thorns of male holotype (MNHNCL ICT 7531; FA-46), respectively.
FIGURE 2 in Redescription and taxonomic status of Dipturus chilensis (Guichenot, 1848), and description of Dipturus lamillai sp. nov. (Rajiformes: Rajidae), a new species of long-snout skate from the Falkland Islands
FIGURE 2. Adult specimens of Dipturus chilensis: (A, C) Dorsal and ventral views of male (CHL-98), respectively. (B, D) Dorsal and ventral view of female voucher (MNHNCL ICT 7550; CHL-89), respectively. Scale-ruler: 15 cm.
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