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URI permanente desta comunidadehttps://bdc.icmbio.gov.br/handle/cecav/1402
Centro Nacional de Pesquisa e Conservação de Tartarugas Marinhas e da Biodiversidade Marinha do Leste
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Resultados da Pesquisa
Item Satellite-tracking Reveals Multiple Foraging Strategies and Threats for Olive ridley Turtles in Brazil(2011-12-20) SILVA, A. C. C. D.; dos SANTOS, E. A. P.; OLIVEIRA, F. L. C.; WEBER, M. I.; BATISTA, J. A. F.; SERAFINI, T. Z.; CASTILHOS, J. C.The state of Sergipe in northeastern Brazil is the largest nesting area for olive ridley turtles along this nation’s coast, and constitutes a major rookery in the western Atlantic as well. Conservation efforts with a focus on nesting activities have been implemented there since 1982, but little is known about other aspects of the life cycle, specifically post-nesting movements of females and the locations of foraging grounds. To address this issue, satellite transmitters were deployed on 10 females that nested between February and April 2006. The turtles were monitored for an average of 113 d (range: 14 to 297 d), and an average movement of 1669 km (range: 407 to 4265 km) was recorded. Of the 10 turtles monitored, 6 moved along the Brazilian continental shelf to neritic foraging areas. Five of these turtles utilized foraging areas along the northern and northeastern coasts of Brazil, while one foraged along the southeastern coastline. Two females were tracked to equatorial oceanic waters, with one first moving to an inshore foraging site where she remained for 34 d before migrating to oceanic waters off the Brazilian coast. Signal transmission of 3 of the 10 turtles tracked ceased during their post-nesting migrations, preventing identification of their feeding areas. Olive ridley turtles nesting on the coast of Sergipe displayed a range of post-nesting movements including to coastal sites along the continental shelf as well as offshore oceanic areas. Inter-nesting habitats, migration routes and foraging grounds showed great overlap with a variety of coastal fisheries, as well as with longline fishing in oceanic waters, a key consideration for developing conservation strategies for this species in the western Atlantic.Item Satellite-tracked movements of female Dermochelys coriacea from southeastern Brazil(2011-10-21) ALMEIDA, A. P.; ECKERT, S. A.; BRUNO, S. C.; SCALFONI, J. T.; Giffoni, B.; LÓPEZ-MENDILAHARSU, M.; THOMÉ, J. C. A.Four female leatherback sea turtles Dermochelys coriacea were satellite tracked from the southeastern coast of Brazil (3 from nesting beaches in the state of Espírito Santo, and 1 recovered from a driftnet off the coast of the state of São Paulo), representing the first study of movements of leatherbacks nesting on Brazilian grounds. The results suggest that during the internesting period, leatherbacks may disperse up to 160 km from the nesting beach using an area of 4400 km2. Tracking also revealed shared feeding areas in southern South America, comprising Brazilian, Uruguayan, and Argentinean waters, and highlighted important interactions with fish eries along nesting, migratory, and feeding habitats. The presence in migratory/foraging areas of turtles from at least 2 different nesting populations from both sides of the South Atlantic Ocean supports the concept that management efforts for this species must incorporate a broad regional perspective.Item Sattelite-tracking of female loggerhead turtles highlights fidelity behavior in northeastern Brazil(2010-08-11) Marcovaldi, Maria Ângela; Lopez, Gustave G.; Soares, Luciano S.; Lima, Eduardo H. S. M.; Thomé, João C. A.; Almeida, Antonio P.ABSTRACT: We studied inter- and postnesting movements in the major loggerhead Caretta caretta nesting population in Brazil. Ten breeding females were satellite-tracked from nesting grounds in the state of Bahia, northeastern Brazil, for up to 1284 d. Eight females stayed in the nesting area after deployment, showing fidelity between internesting home ranges and nesting locations, even at a local scale. During postnesting movements, all of the turtles migrated to the northern coast of Brazil to individual foraging areas on the continental shelf. Distances between nesting and foraging areas reached up to 2400 km, and migration lasted from 28 to 47 d. Five females were tracked during subsequent breeding migrations to the nesting area at different remigration intervals of 2 or 3 yr. Females were also tracked during a second postnesting migration back to foraging areas, and these showed strong fidelity to foraging grounds. Movements to and from foraging grounds occurred along the shelf, clearly delineating a migratory corridor. The northern coast of Brazil, specifically the coast of the state of Ceará, is an important foraging ground for loggerheads nesting along the northern coast of Bahia.Item Satellite-tracked Movements of Female Dermochelys coriacea From Southeastern Brazil(Endangered Species Research, 2011-10-21) ALMEIDA, A. P; ECKERT, S. A; BRUNO, S. C; SCALFONI, J. T; Giffoni, B; LÓPEZ-MENDILAHARSU, M.; THOMÉ, J. C. AFour female leatherback sea turtles Dermochelys coriacea were satellite tracked from the southeastern coast of Brazil (3 from nesting beaches in the state of Espírito Santo, and 1 recovered from a driftnet off the coast of the state of São Paulo), representing the first study of movements of leatherbacks nesting on Brazilian grounds. The results suggest that during the internesting period, leatherbacks may disperse up to 160 km from the nesting beach using an area of 4400 km2 . Tracking also revealed shared feeding areas in southern South America, comprising Brazilian, Uruguayan, and Argentinean waters, and highlighted important interactions with fish eries along nesting, migratory, and feeding habitats. The presence in migratory/foraging areas of turtles from at least 2 different nesting populations from both sides of the South Atlantic Ocean supports the concept that management efforts for this species must incorporate a broad regional perspective.