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354 results for “Elasmobranchs”
Figure 2 from: Zaragoza-Tapia F, Pulido-Flores G, Gardner SL, Monks S (2020) Host relationships and geographic distribution of species of Acanthobothrium Blanchard, 1848 (Onchoproteocephalidea, Onchobothriidae) in elasmobranchs: a metadata analysis. ZooKeys 940: 1-49. https://doi.org/10.3897/zookeys.940.46352
Figure 2 Families of sharks: A number of species of sharks per family B number of species of sharks parasitized by species of Acanthobothrium. Note: The first number within parentheses corresponds to the number of species of shark that have been reported as hosts of Acanthobothrium and the second is the number of species that have been described from that Family C percentage of species of shark reported to be parasitized within the total number of families of sharks- note: Red color = parasitized; Blue color = not parasitized.
Figures 11-12 from: Reis M, Figueira WF (2020) Age, growth and reproductive biology of two endemic demersal bycatch elasmobranchs: Trygonorrhina fasciata and Dentiraja australis (Chondrichthyes: Rhinopristiformes, Rajiformes) from Eastern Australia. Zoologia 37: 1-12. https://doi.org/10.3897/zoologia.37.e49318
Figures 11-12 Monthly averages (±SE) of marginal increments from sections of vertebral centra of Trygonorrhina fasciata (11) and Dentiraja australis (12). The values indicate the number of sampled individuals.
Figure 2 from: Reis M, Figueira WF (2020) Age, growth and reproductive biology of two endemic demersal bycatch elasmobranchs: Trygonorrhina fasciata and Dentiraja australis (Chondrichthyes: Rhinopristiformes, Rajiformes) from Eastern Australia. Zoologia 37: 1-12. https://doi.org/10.3897/zoologia.37.e49318
Figure 2 Photos of vertebrae section of Trygonorrhina fasciata (left, sampling code AP085 – 632 mm TL) and Dentiraja australis (right, sampling code 053 – 328 mm DW). White dots indicated by arrows show birth mark (BM), while the remaining highlight the growth opaque bands and the bar indicate vertebral radius (VR).
Figures 25-26 from: Reis M, Figueira WF (2020) Age, growth and reproductive biology of two endemic demersal bycatch elasmobranchs: Trygonorrhina fasciata and Dentiraja australis (Chondrichthyes: Rhinopristiformes, Rajiformes) from Eastern Australia. Zoologia 37: 1-12. https://doi.org/10.3897/zoologia.37.e49318
Figures 25-26 Ratio of females in each reproduction stage per month and season in the available samples of Trygonorrhina fasciata (25) and Dentiraja australis (26).
Figures 9-10 from: Reis M, Figueira WF (2020) Age, growth and reproductive biology of two endemic demersal bycatch elasmobranchs: Trygonorrhina fasciata and Dentiraja australis (Chondrichthyes: Rhinopristiformes, Rajiformes) from Eastern Australia. Zoologia 37: 1-12. https://doi.org/10.3897/zoologia.37.e49318
Figures 9-10 Von Bertalanffy growth curve for Trygonorrhina fasciata (9) and for Dentiraja australis (10). The line is the adjusted VBGM.
Figures 5-6 from: Reis M, Figueira WF (2020) Age, growth and reproductive biology of two endemic demersal bycatch elasmobranchs: Trygonorrhina fasciata and Dentiraja australis (Chondrichthyes: Rhinopristiformes, Rajiformes) from Eastern Australia. Zoologia 37: 1-12. https://doi.org/10.3897/zoologia.37.e49318
Figures 5-6 Length-weight relationship for males (black dots) and females (white dots) using total length for Trygonorrhina fasciata (5) and using disc width for Dentiraja australis (6).
Figure 1 from: Reis M, Figueira WF (2020) Age, growth and reproductive biology of two endemic demersal bycatch elasmobranchs: Trygonorrhina fasciata and Dentiraja australis (Chondrichthyes: Rhinopristiformes, Rajiformes) from Eastern Australia. Zoologia 37: 1-12. https://doi.org/10.3897/zoologia.37.e49318
Figure 1 Map of Australia (a), New South Wales (b) and the upper central New South Wales coast (c) with landing locations of sampled individuals of Trygonorrhina fasciata and the Dentiraja australis.
Figures 7-8 from: Reis M, Figueira WF (2020) Age, growth and reproductive biology of two endemic demersal bycatch elasmobranchs: Trygonorrhina fasciata and Dentiraja australis (Chondrichthyes: Rhinopristiformes, Rajiformes) from Eastern Australia. Zoologia 37: 1-12. https://doi.org/10.3897/zoologia.37.e49318
Figures 7-8 Relationship between vertebral radius (mm) and total length (cm) with 95% confidence of Trygonorrhina fasciata (7) and for Dentiraja australis (8).
Figures 3-4 from: Reis M, Figueira WF (2020) Age, growth and reproductive biology of two endemic demersal bycatch elasmobranchs: Trygonorrhina fasciata and Dentiraja australis (Chondrichthyes: Rhinopristiformes, Rajiformes) from Eastern Australia. Zoologia 37: 1-12. https://doi.org/10.3897/zoologia.37.e49318
Figures 3-4 Linear relationship between Total Length (Lt) and Disc Width (DW) for Trygonorrhina fasciata (3) and Dentiraja australis (4). Black dots (males) and white dots (females).
Figures 19-24 from: Reis M, Figueira WF (2020) Age, growth and reproductive biology of two endemic demersal bycatch elasmobranchs: Trygonorrhina fasciata and Dentiraja australis (Chondrichthyes: Rhinopristiformes, Rajiformes) from Eastern Australia. Zoologia 37: 1-12. https://doi.org/10.3897/zoologia.37.e49318
Figures 19-24 Hepatosomatic index (19–21) and gonadosomatic index (22–24) with standard error (±2 SE) for sampled specimens of Dentiraja australis. Results of HSI considering both sexes (19), females only (20) and males only (21) and GSI considering both sexes (22), females only (23) and males only (24).
Figures 13-18 from: Reis M, Figueira WF (2020) Age, growth and reproductive biology of two endemic demersal bycatch elasmobranchs: Trygonorrhina fasciata and Dentiraja australis (Chondrichthyes: Rhinopristiformes, Rajiformes) from Eastern Australia. Zoologia 37: 1-12. https://doi.org/10.3897/zoologia.37.e49318
Figures 13-18 Hepatosomatic index (13–15) and gonadosomatic index (16–18) with standard error (±2 SE) for sampled specimens of Trygonorrhina fasciata. Results of HSI considering both sexes (13), females only (14) and males only (15) and GSI considering both sexes (16), females only (17) and males only (18).
FIGURE 14 in New records of elasmobranchs in the Bay of Bengal, Bangladesh: further taxonomic research is essential
FIGURE 14. Dorsal image of Narcine sp. from a commercial scale vessel in Chattogram.
FIGURE 11 in New records of elasmobranchs in the Bay of Bengal, Bangladesh: further taxonomic research is essential
FIGURE 11. Dorsal image of Urogymnus granulatus from Cox's Bazar.
FIGURE 6 in New records of elasmobranchs in the Bay of Bengal, Bangladesh: further taxonomic research is essential
FIGURE 6. Dorsal image of Pateobatis jenkinsii from St. Martin's Island.
Elasmobranch diversity across a remote coral reef atoll revealed through environmental DNA metabarcoding
<p><span><span><span><span><span><span><span><span><span><span><span>As elasmobranchs are becoming increasingly threatened, efficient methods for monitoring the distribution and diversity of elasmobranch populations are required. Environmental DNA (eDNA) metabarcoding is an increasingly applied technique that enables mass identification of entire communities and is an effective method for the detection of rare and elusive species. We performed an eDNA metabarcoding survey for fish communities around a coral reef atoll in the Chagos Archipelago and assessed the diversity and distribution of elasmobranch species detected within these communities. Our eDNA survey detected 353 amplicon sequence variants (ASVs) attributed to fishes, 12 of which were elasmobranchs. There were no differences in fish communities based on the presence and absence of ASVs between sample depth (surface and 40m) or sampling habitat, but communities based on read abundance were significantly different between habitats. The dominant elasmobranch species were grey reef (<i>Carcharhinus amblyrhynchos</i>) and silvertip (<i>C. albimarginatus</i>) sharks, and elasmobranch communities were significantly different between sampling depth and habitat. Overall, we find that eDNA metabarcoding can be used to reveal the diversity of elasmobranchs within broader taxonomic assays, but further research and development of targeted metabarcoding primers may be required before it can be integrated into a toolkit for monitoring these species.</span></span></span></span></span></span></span></span></span></span></span></p>
Figure 2. A in Elasmobranch diversity across a remote coral reef atoll revealed through environmental DNA metabarcoding
Figure 2. A, taxonomic breakdown of eDNA reads by class in water samples collected around Diego Garcia atoll in September 2019. In each case, the fraction of the water column sampled is denoted by the colour key displayed below each bar. B, principal coordinate analysis (PCoA) of read abundance of all fish and elasmobranch ASVs per sample based on Bray–Curtis similarity. C, PCoA of read abundance of elasmobranch ASVs per sample based on Bray–Curtis similarity. Site numbers refer to the sites described in Figure 1.
Figure 1 in Elasmobranch diversity across a remote coral reef atoll revealed through environmental DNA metabarcoding
Figure 1. Location of water sampling sites around Diego Garcia. Triangles represent sampling sites on the outside of the atoll (N = 27), sites where samples were taken at 40 m and the surface (paired) are shown with a dark triangle inside. Circles represent lagoon samples (N = 5). Contour lines show the bottom depth in meters and colours represent the designated habitats around the atoll. Inset shows the location of Diego Garcia with respect to the other atolls in the Chagos Archipelago. Map was made using QGIS v.3.
FIGURE 11. A-C in Diversity and renewal of tropical elasmobranchs around the Middle Eocene Climatic Optimum (MECO) in North Africa: New data from the lagoonal deposits of Djebel el Kébar, Central Tunisia
FIGURE 11. A-C. Ouledia lacuna nov. sp. A.?Anterior tooth KEB 1-180, A1. Occlusal view, A2. Lingual view, A3. Magnificence of crown-root boundary in A2, A4. profile; B.?lateral tooth KEB 1-181, B1. Occlusal view, B2. labial view, C.?Anterior tooth KEB 1-182, C1. Labial view, C2. Basal view; D-H. Pachygymnura attiai nov. gen. D. Anterior tooth KEB 1-183, D1. Lingual view, D2. Occlusal view, D3. Labial view, D4. Basal view; E. Antero-lateral tooth KEB 1-184, E1. Lingual view, E2. Near labial view, F. lateral tooth KEB 1-185, F1. Occlusal view, F2. Profile, F3. Basal view; G. lateral tooth KEB 1-186, G1. Lingual view, G2. Occlusal view; H. Anterior tooth KEB 1-187, H1. Profile, H2. Occlusal view.
FIGURE 7. A-C in Diversity and renewal of tropical elasmobranchs around the Middle Eocene Climatic Optimum (MECO) in North Africa: New data from the lagoonal deposits of Djebel el Kébar, Central Tunisia
FIGURE 7. A-C: Hemipristis curvatus. A. Antero-lateral upper tooth KEB 1-133, A1. Lingual view, A2. Labial view; B. Lateral upper tooth of young specimen KEB 1-134, labial view; C. Anterior lower tooth of young specimen KEB 1-135, labial view; D-E: Moerigaleus sp. D. Lateral upper tooth KEB 1-136, D1. Lingual view, D2. Labial view; E. Lateral upper tooth KEB 1-137, E1. Lingual view, E2. Labial view; F-K: Leptocharias tunisiensis nov. sp. F. (HOLOTYPE) Antero-lateral lower tooth KEB 1-138, F1. Profile, F2. Lingual view, F3. Labial view; G. Antero-lateral upper tooth KEB 1-139, G1. Labial view, G2. Profile, G3. Lingual view; H. Anterro-lateral lower tooth KEB 1-140, labial view; I. Lateral lower tooth KEB 1-141, labial view; J. More lateral tooth KEB 1-142, J1. Labial view, J2. Lingual view, J3 occlusal view; K. Posterior tooth KEB 1-143, K1. Labial view, K2. Lingual view.
FIGURE 5. A-K in Diversity and renewal of tropical elasmobranchs around the Middle Eocene Climatic Optimum (MECO) in North Africa: New data from the lagoonal deposits of Djebel el Kébar, Central Tunisia
FIGURE 5. A-K: Sphyrna guinoti nov. sp. A. Anterior upper tooth KEB 1-109, A1. Labial view, A2. Lingual view; B. Lateral upper tooth KEB 1-110, B1. Labial view, B2. Lingual view; C. Anterior upper tooth KEB 1-111, C1. Lingual view, C2. Labial view; D. Lateral lower tooth KEB 1-112, D1. Labial view, D2. Lingual view; E. lateral upper tooth KEB 1-113, E1. Lingual view, E2. Labial view; F. Lateral upper tooth KEB 1-114, F1. Labial view, F2. Lingual view; G. Posterior upper tooth KEB 1-115, lingual view; H. Anterior lower tooth KEB 1-116, H1. Labial view, H2. Lingual view; I. Antero-lateral lower tooth KEB 1-117, I1. Labial view, I2. Lingual view; J. (HOLOTYPE) Antero-lateral lower tooth KEB 1-118, J1. Labial view, J2. Lingual view; K. Lateral lower tooth KEB 1-119, K1. Labial view, K2. Lingual view.
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