Feeding strategy of the night shark (Carcharhinus signatus) and scalloped hammerhead shark (Sphyrna lewini) near seamounts off northeastern Brazil
A total of 425 stomachs of night shark (Carcharhinus signatus), and 98 stomachs of scalloped hammerhead shark (Sphyrna lewini), from longline and surface gillneters near seamounts off northeastern Brazil, were analysed between 1992 and 1999. Both predators prey upon reef and benthopelagic fishes, mi...
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| Format: | Article |
| Language: | English |
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Universidade de São Paulo
2009-06-01
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| Series: | Brazilian Journal of Oceanography |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592009000200002 |
| _version_ | 1828296313175801856 |
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| author | Teodoro Vaske Júnior Carolus Maria Vooren Rosangela Paula Lessa |
| author_facet | Teodoro Vaske Júnior Carolus Maria Vooren Rosangela Paula Lessa |
| author_sort | Teodoro Vaske Júnior |
| collection | DOAJ |
| description | A total of 425 stomachs of night shark (Carcharhinus signatus), and 98 stomachs of scalloped hammerhead shark (Sphyrna lewini), from longline and surface gillneters near seamounts off northeastern Brazil, were analysed between 1992 and 1999. Both predators prey upon reef and benthopelagic fishes, migrant cephalopods and deep water crustaceans, showing similar feeding niches (Schoener Index T=0.75). The great prey richness of the diets may reflect the fact that the marine food web for these species is very extensive in this region. Due to the concentration for feeding of both predators in the seamounts, intense fisheries should be monitored to avoid localised depletions.<br>Um total de 425 estômagos de tubarão-toninha (Carcharhinus signatus) e 98 estômagos de tubarão-martelo-entalhado (Sphyrna lewini), oriundos da pesca de espinhel e pesca com rede de emalhe nas adjacências dos bancos oceânicos do nordeste do Brasil, foi analisado entre 1992 e 1999. Ambas as espécies predam sobre peixes bento-pelágicos e recifais, cefalópodes migradores, e crustáceos de águas profundas, apresentando nichos alimentares similares (Índice de Schoener T=0.75). A alta riqueza de presas nas dietas deve ser um reflexo de que as teias alimentares para estas espécies são consideravelmente longas nessa região. Devido à concentração alimentar de ambos predadores nos bancos oceânicos, a pescaria intensa deve ser monitorada para evitar depleções locais. |
| first_indexed | 2024-04-13T12:09:46Z |
| format | Article |
| id | doaj.art-c82731f8ed8142de960d5a37a3a0f467 |
| institution | Directory Open Access Journal |
| issn | 1679-8759 1982-436X |
| language | English |
| last_indexed | 2024-04-13T12:09:46Z |
| publishDate | 2009-06-01 |
| publisher | Universidade de São Paulo |
| record_format | Article |
| series | Brazilian Journal of Oceanography |
| spelling | doaj.art-c82731f8ed8142de960d5a37a3a0f4672022-12-22T02:47:31ZengUniversidade de São PauloBrazilian Journal of Oceanography1679-87591982-436X2009-06-015729710410.1590/S1679-87592009000200002Feeding strategy of the night shark (Carcharhinus signatus) and scalloped hammerhead shark (Sphyrna lewini) near seamounts off northeastern BrazilTeodoro Vaske JúniorCarolus Maria VoorenRosangela Paula LessaA total of 425 stomachs of night shark (Carcharhinus signatus), and 98 stomachs of scalloped hammerhead shark (Sphyrna lewini), from longline and surface gillneters near seamounts off northeastern Brazil, were analysed between 1992 and 1999. Both predators prey upon reef and benthopelagic fishes, migrant cephalopods and deep water crustaceans, showing similar feeding niches (Schoener Index T=0.75). The great prey richness of the diets may reflect the fact that the marine food web for these species is very extensive in this region. Due to the concentration for feeding of both predators in the seamounts, intense fisheries should be monitored to avoid localised depletions.<br>Um total de 425 estômagos de tubarão-toninha (Carcharhinus signatus) e 98 estômagos de tubarão-martelo-entalhado (Sphyrna lewini), oriundos da pesca de espinhel e pesca com rede de emalhe nas adjacências dos bancos oceânicos do nordeste do Brasil, foi analisado entre 1992 e 1999. Ambas as espécies predam sobre peixes bento-pelágicos e recifais, cefalópodes migradores, e crustáceos de águas profundas, apresentando nichos alimentares similares (Índice de Schoener T=0.75). A alta riqueza de presas nas dietas deve ser um reflexo de que as teias alimentares para estas espécies são consideravelmente longas nessa região. Devido à concentração alimentar de ambos predadores nos bancos oceânicos, a pescaria intensa deve ser monitorada para evitar depleções locais.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592009000200002Agregações alimentaresMontes submarinosCarcharhinus signatusSphyrna lewiniFeeding aggregationsSeamountsCarcharhinus signatusSphyrna lewini |
| spellingShingle | Teodoro Vaske Júnior Carolus Maria Vooren Rosangela Paula Lessa Feeding strategy of the night shark (Carcharhinus signatus) and scalloped hammerhead shark (Sphyrna lewini) near seamounts off northeastern Brazil Brazilian Journal of Oceanography Agregações alimentares Montes submarinos Carcharhinus signatus Sphyrna lewini Feeding aggregations Seamounts Carcharhinus signatus Sphyrna lewini |
| title | Feeding strategy of the night shark (Carcharhinus signatus) and scalloped hammerhead shark (Sphyrna lewini) near seamounts off northeastern Brazil |
| title_full | Feeding strategy of the night shark (Carcharhinus signatus) and scalloped hammerhead shark (Sphyrna lewini) near seamounts off northeastern Brazil |
| title_fullStr | Feeding strategy of the night shark (Carcharhinus signatus) and scalloped hammerhead shark (Sphyrna lewini) near seamounts off northeastern Brazil |
| title_full_unstemmed | Feeding strategy of the night shark (Carcharhinus signatus) and scalloped hammerhead shark (Sphyrna lewini) near seamounts off northeastern Brazil |
| title_short | Feeding strategy of the night shark (Carcharhinus signatus) and scalloped hammerhead shark (Sphyrna lewini) near seamounts off northeastern Brazil |
| title_sort | feeding strategy of the night shark carcharhinus signatus and scalloped hammerhead shark sphyrna lewini near seamounts off northeastern brazil |
| topic | Agregações alimentares Montes submarinos Carcharhinus signatus Sphyrna lewini Feeding aggregations Seamounts Carcharhinus signatus Sphyrna lewini |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-87592009000200002 |
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