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7 results for “Carcharodon carcharias”
Fig. 9. Centra from extant Carcharodon carcharias Linnaeus, 1758 in Vertebral morphology, dentition, age, growth, and ecology of the large lamniform shark Cardabiodon ricki
Fig. 9. Centra from extant Carcharodon carcharias Linnaeus, 1758 (A) and Cetorhinus maximus Gunnerus, 1765 (B, C). A. Centrum, LACM I-35875- 1, in anterior (A 1), left lateral (A 2), posterior (A 3), dorsal (A 4), and ventral (A 5) views. B. Partial centrum (LACM I-35593-1a) in transverse section (B 1) posterior (B 2), left lateral (B 3), and dorsal (B 4) views. C. Partial centrum (LACM I-35593-1b) in left lateral (C 1), ventral (C 2), and one-half hemi-section (C ) views.
CBS Miami video of Great White Shark, Carcharodon carcharias, off Islamorada, Florida Keys (April 16, 2016)
<p>Video of first record of the Great White Shark, <em>Carcharodon carcharias</em>, on Alligator Reef, Florida Keys, USA: CBS Miami</p> <p>included in:</p> <p>Estape C.J., Morgan Estape, A. & Starck, W.A. (2020) The fishes of Alligator Reef and environs in the Florida Keys: a 2020 update. <em>Journal of the Ocean Science Foundation</em>, 36, 16–19.</p> <p> </p>
Data from: Genetic diversity of white sharks, Carcharodon carcharias, in the northwest Atlantic and southern Africa
The white shark, Carcharodon carcharias, is both one of the largest apex predators in the world and among the most heavily protected marine fish. Population genetic diversity is in part shaped by recent demographic history and can thus provide information complementary to more traditional population assessments, which are difficult to obtain for white sharks and have at times been controversial. Here, we use the mitochondrial control region and 14 nuclear-encoded microsatellite loci to assess white shark genetic diversity in 2 regions: the Northwest Atlantic (NWA, N = 35) and southern Africa (SA, N = 131). We find that these 2 regions harbor genetically distinct white shark populations (Φ ST = 0.10, P < 0.00001; microsatellite F ST = 0.1057, P < 0.021). M-ratios were low and indicative of a genetic bottleneck in the NWA (M-ratio = 0.71, P < 0.004) but not SA (M-ratio = 0.85, P = 0.39). This is consistent with other evidence showing a steep population decline occurring in the mid to late 20th century in the NWA, whereas the SA population appears to have been relatively stable. Estimates of effective population size ranged from 22.6 to 66.3 (NWA) and 188 to 1998.3 (SA) and evidence of inbreeding was found (primarily in NWA). Overall, our findings indicate that white population dynamics within NWA and SA are determined more by intrinsic reproduction than immigration and there is genetic evidence of a population decline in the NWA, further justifying the strong domestic protective measures that have been taken for this species in this region. Our study also highlights how assessment of genetic diversity can complement other sources of information to better understand the status of threatened marine fish populations.
Data from: Mitochondrial genetic structure and matrilineal origin of white sharks, Carcharodon carcharias, in the Northeastern Pacific: implications for their conservation
White sharks (Carcharodon carcharias, WS henceforth) are globally and regionally threatened. Understanding their patterns of abundance and connectivity, as they relate to habitat use, is central for delineating conservation units and identifying priority areas for conservation. We analyzed mitochondrial data to test the congruence between patterns of genetic connectivity and of individual movements in the Northeastern Pacific (NEP) and to trace the matrilineal origin of immature WS from coastal California and Baja California to adult aggregation areas. We analyzed 186 mitochondrial control region sequences from sharks sampled in Central California (CC; n = 61), Southern California Bight (SCB; n = 25), Baja California Pacific coast (BCPC; n = 9), Bahía Vizcaíno (BV; n = 39), Guadalupe Island (GI; n = 45), and the Gulf of California (GC; n = 7). Significant mitochondrial differentiation between adult aggregation areas (CC, GI) revealed two reproductive populations in the NEP. We found general concordance between movement patterns of young and adult WS with genetic results. Young sharks from coastal California and Baja California were more likely born from females from GI. Mitochondrial differentiation of young-of-the-year from SCB and BV suggests philopatry to nursery areas in females from GI. These results provide a genetic basis of female reproductive behavior at a regional scale and point to a preponderance of sharks from GI in the use of the sampled coastal region as pupping habitat. These findings should be considered in Mexican and US management and conservation strategies of the WS NEP population.
Data from: Genetic diversity of white sharks, Carcharodon carcharias, in the northwest Atlantic and southern Africa
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Data from: Mitochondrial genetic structure and matrilineal origin of white sharks, Carcharodon carcharias, in the Northeastern Pacific: implications for their conservation
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Implications of life history uncertainty when evaluating status in the Northwest Atlantic population of white shark (Carcharodon carcharias)
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