Navegando por Autor "WEBER, M. I."
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Item Avaliação da mortalidade da tartaruga marinha Lepidochelys olivacea e de sua relação com atividades de pesca de camarão, região costeira de Sergipe, Brasil(2004-10) SILVA, A. C. C. D. da.; CASTILHOS, J. C. de.; OLIVEIRA, F. L. das C.; WEBER, M. I.; ROCHA, D. A. dos S.Item Identificação de Áreas Críticas para Tartarugas Marinhas e sua Relação com Unidades de Conservação no Brasil(2022-05-31) SANTOS, J. A.; COLMAN, L. P.; SANTOS, A. J. B.; BELLINI, C.; PIZETTA, G. T.; WEBER, M. I.; OLIVEIRA, F. L. C.; RAMOS, R. M. A.; SANTOS, E. A. P.As tartarugas marinhas são animais migratórios e o conhecimento de seus movimentos é vital para a definição de estratégias de manejo. Áreas principais de uso de quatro das cinco espécies que ocorrem no litoral brasileiro, a saber: Caretta caretta, Lepidochelys olivacea, Eretmochelys imbricata e Dermochelys coriacea, foram identificadas através da telemetria por satélite (n = 160 transmissores) e analisadas por meio do método State-Space Model. As áreas principais de uso identificadas corresponderam a 3% da distribuição total e localizaram-se, majoritariamente, na costa do Pará, Ceará e Rio Grande do Norte; ao longo da margem leste da plataforma continental do Nordeste, até Salvador, Bahia; no sul da Bahia e Espírito Santo; na plataforma de São Paulo e no estuário do Rio de la Plata, entre o Uruguai e Argentina. Os movimentos das tartarugas intersectaram 89,6% das unidades de conservação marinhas consideradas (52 das 58 UCs), porém, apenas 21,5% das áreas principais de uso sobrepuseram unidades de conservação (UCs = 15). Dentre estas, se destacam: APA Plataforma Continental do Litoral Norte, APA Costa dos Corais, APA dos Recifes de Corais e a APA Ponta da Baleia – Abrolhos, dada presença de áreas principais, utilizadas por duas ou três espécies. Os resultados evidenciam a importância das unidades de conservação, assim como apontam a necessidade de essas áreas adotarem medidas para a redução de ameaças, em especial a captura incidental por pescarias. Os resultados mostram também potencial para contribuir com análises de impactos ambientais de empreendimentos marinhos, dentro ou fora dos limites de unidades de conservação.Item Nesting biology and conservation of the olive ridley sea turtle (Lepidochelys olivacea) in the State of Sergipe, Brazil, 1990/1991-2000/2001(2002) SILVA, A. C. C. D. da; CASTILHOS DE, J. C.; ROCHA, D. A. S.; OLIVEIRA, F. L. C.; WEBER, M. I.; BARATA, P. C. R.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 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.