Navegando por Autor "CASTILHOS, J. C."
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Item Nesting biology and conservation of the olive ridley sea turtle (Lepidochelys olivacea) in Brazil, 1991/1992 to 2002/2003(2007-05-08) SILVA, A. C. C. D.; CASTILHOS, J. C.; LOPEZ, G. G.; BARATA, P. C. R.This article presents biological data and an assessment of the conservation of the olive ridley sea turtle (Lepidochelys olivacea) population nesting in the States of Sergipe and Bahia, north-eastern Brazil, between 1991/1992 and 2002/2003. Projeto TAMAR-IBAMA (the Brazilian Sea Turtle Conservation Programme) maintains seven field stations in that region to monitor nesting activity over 339 km of beach. An increasing trend was observed in the estimated number of nests per nesting season: from 252 nests in 1991/1992 to 2606 in 2002/2003, an approximately 10-fold increase in 11 years. The available data and biological knowledge suggest that TAMAR’s conservation efforts may have contributed to the significant increase in olive ridley nesting in Sergipe and Bahia; that increase is not only of regional importance, but also of significance at the western Atlantic levelItem 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 Strong site fidelity and longer interesting interval for solitary nesting olive ridley sea turtles in Brazil(2012-01-29) MATOS, L.; SILVA, A. C. C. D.; CASTILHOS, J. C.; WEBER, M. I.; SOARES, L. S.; VICENTE, L.Olive ridley sea turtles display two different types of nesting behavior: in arribada (synchronous mass nesting) or solitarily. Contrarily to arribadas, little has been published about solitary nesters. This study aimed to expand the knowledge on internesting interval and site fidelity of solitary nesting olive ridleys and to test a possible devel opment of arribada nesting behavior. Data were collected in Sergipe (Brazil) over 125 km of beach from 10º30/S/ 36º23'W to 11º26'S/37º19'W, between nesting seasons 2004/2005 and 2006/2007. From 962 tagged females, 173 were seen renesting. The average internesting interval found was longer (22.35 ± 7.01 days) than previously described, which might relate to lower water temperatures during the internesting period. Olive ridleys at Sergipe showed high nesting site fidelity, with consecutive nesting events occurring in close proximity, non-randomly and dependently of previous events. Most of the consecutive nests were separated by 4.06–5.59 km. Development of arribada nesting behavior was not confirmedItem Using stranding data as a key to mitigate threats at one of the largest olive ridley rookery in the south atlantic(2018) CASTILHOS, J. C.; GOLDBERG, D. W.; GIFFONI, B. B.; WEBER, M. I.; OLIVEIRA, F. L. C.; FONSECA, E. L.; SILVA, A. C. C. D.; MELO, A. C. C.; ABREU, J. A. G.; SANTOS, E. A. P.; TOGNIN, F.; NILLIN, J.