Sharks caught in the protective gill nets off Natal, South Africa. 2. The great white shark<i>Carcharodon carcharias</i>(Linnaeus)

Cliff, Geremy; Dudley, Sheldon F.; Davis, B. N. K.

doi:10.2989/02577618909504556

Cited by 120 publications

(100 citation statements)

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“…Nevertheless, Fergusson [11] suggests some seasonality of white sharks, catch data indicating movement into cooler northern areas (the Adriatic) from the south (Tunisia and Sicilian Channel) in summer months. Consistent with this, high summer sea surface temperature (SST) of approximately 268C (close to the species's upper limit [42]) in the Red Sea and adjacent waters, and a lack of confirmed sightings, suggests this area acts as a thermal barrier, making a Lessepsian migration route less likely. So, what mechanism can be invoked to explain the anomalous presence of these haplotypes?…”

Section: Discussionmentioning

confidence: 84%

Antipodean white sharks on a Mediterranean walkabout? Historical dispersal leads to genetic discontinuity and an endangered anomalous population

et al. 2010

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The provenance of white sharks (Carcharodon carcharias) in the Mediterranean is both a conundrum and an important conservation issue. Considering this species's propensity for natal philopatry, any evidence that the Mediterranean stock has little or no contemporary immigration from the Atlantic would suggest that it is extraordinarily vulnerable. To address this issue we sequenced the mitochondrial control region of four rare Mediterranean white sharks. Unexpectedly, the juvenile sequences were identical although collected at different locations and times, showing little genetic differentiation from Indo-Pacific lineages, but strong separation from geographically closer Atlantic/western Indian Ocean haplotypes. Historical long-distance dispersal (probably a consequence of navigational error during past climatic oscillations) and potential founder effects are invoked to explain the anomalous relationships of this isolated 'sink' population, highlighting the present vulnerability of its nursery grounds.

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Section: Discussionmentioning

confidence: 84%

Antipodean white sharks on a Mediterranean walkabout? Historical dispersal leads to genetic discontinuity and an endangered anomalous population

et al. 2010

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“…Casey & Pratt (1985) noted that the 15°C value is an important threshold for great white shark movements in the western North Atlantic, and Cliff et al (1989) considered that the 26°C isotherm was at the upper range of tolerance for this species. Accordingly, white sharks are more common when water temperature is over 14-15°C in the Monterey bay in California (Compagno, 1984).…”

Section: Habitat and Distribution Of Carcharodon Carchariasmentioning

confidence: 99%

Causes and contrasts in current and past distribution of the white shark (Lamniformes: Carcharodon carcharias) off southeastern South America

Cione¹,

Barla²

2008

MACN

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Abstract:The great white shark is a cosmopolitan temperate marine species which is rare in Argentina, Uruguay, and Brazil today. Several publications include the white shark as inhabiting Patagonian waters. However, there is no recent or fossil record of the white shark south of S 38° 30´ in the southwestern Atlantic. A tooth found in Quaternary sediments at Pehuencó (S 38° 56´), southern Buenos Aires province, is the southernmost occurrence of the species in the southwestern Atlantic. The occurrence of C. carcharias in the Buenos Aires province is another confirmation that the Argentine biogeographic province extends to the south of the Río de la Plata. The present extremely scarce record indicates that there are not permanent living populations in the South American Atlantic coast but occasional transient individuals. However, the abundant fossil and archaeological record suggests that it was much more common in southwestern Atlantic during the late Pleistocene and Holocene than today. This drop in abundance is here mostly attributed to the massive extermination of pinnipeds and cetaceans during the XIX th and XX th centuries. Patagonian waters, where marine mammals are relatively abundant even today, might be too cold for the species which is mostly encountered between 15-23°C. Besides, another important predator, the killer whale, which also feeds on marine mammals, is frequently found in these waters. Consequently, available evidence suggests that unrestricted hunting of pinnipeds and cetaceans also decimated another animal, a fish. Keywords:Carcharodon carcharias, white shark, Argentina, Atlantic, pinniped, cetacean, biogeography. Resumen: Causas y contrastes en la distribución presente y pasada del tiburón blanco (Lamniformes:Carcharodon carcharias) costa afuera de Sud América sudoriental. El tiburón blanco es una especie cosmopolita en mares templados y que es rara actualmente en Argentina, Uruguay y Brasil. Varias publicaciones incluyen a tiburón blanco como habitando aguas patagónicas. Sin embargo, no hay registro actual o fósil al sur de S 38° 30´ en el Atlántico sudoccidental. Un diente hallado en sedimentos cuaternarios en Pehuencó (S 38°5 6'), sur de la provincia de Buenos Aires es el registro más austral en el Atlántico sudoccidental. El registro actual de C. carcharias en la provincia de Buenos Aires es otra confirmación de que la provincia biogeográfica Argentina se extiende al sur del Río de la Plata. El extremadamente escaso registro actual indica que no hay poblaciones permanentes en la costa atlántica sudamericana sino individuos aislados. Sin embargo, el abundante registro fósil y arqueológico sugiere que fue mucho más común durante el Pleistoceno tardío y el Holoceno. La disminución de la abundancia es aquí principalmente atribuida al exterminio masivo de pinípedos y cetáceos en los siglos XIX th y XX. th Las aguas patagónicas, donde todavía hay abundancia de mamíferos marinos podrían ser demasiado frías para la especie, que es más frecuente entre 15° y 23 °C. Por otra parte, la orca, que ...

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“…Cliff et al (1989) identified two relatively uniform temperature zones on the netted coast, Richards Bay to Park Rynie forming a warm, northern region and St Michaels-on-Sea to Mzamba a cool, southern region. Based on %F values, T. delagoa was the most important prey in sharks from the warmer, northern region (Table III).…”

Section: Regional and Seasonal Variation In Dietmentioning

confidence: 99%

Sharks caught in the protective gill nets off Natal, South Africa. 7. The blacktip sharkCarcharhinus limbatus(Valenciennes)

Dudley¹,

Cliff²

1993

South African Journal of Marine Science

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Sharks caught in the protective gill nets off Natal, South Africa. 2. The great white sharkCarcharodon carcharias(Linnaeus)

Cited by 120 publications

References 1 publication

Antipodean white sharks on a Mediterranean walkabout? Historical dispersal leads to genetic discontinuity and an endangered anomalous population

Antipodean white sharks on a Mediterranean walkabout? Historical dispersal leads to genetic discontinuity and an endangered anomalous population

Causes and contrasts in current and past distribution of the white shark (Lamniformes: Carcharodon carcharias) off southeastern South America

Sharks caught in the protective gill nets off Natal, South Africa. 7. The blacktip sharkCarcharhinus limbatus(Valenciennes)

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