TAMAR
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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13 resultados
Resultados da Pesquisa
Item Internesting intervals of hawksbill turtles through satellite tracking using gps reveals residence fidelity(2019) BELLINI, C.; SANTOS, E.A.P; RAMOS, R.; MARCOVALDI, M. A; SANTOS, A. J. BItem Deeper mitochondrial sequencing reveals cryptic diversity and structure in Brazilian green turtle rookeries.(Chelonian Conservation and Biology, 2015) SHAMBLIN, B. M; DUTTON, P. H; BJORNDAL, K. A; BOLTEN, A. B; NARO-MACIEL, E; SANTOS, A. J. B; BELLINI, C; BAPTISTOTTE, C; MARCOVALDI, M. A; NAIRN, C. JGenetic markers are often used to designate population units for management and conservation, but widespread sharing of mitochondrial DNA control-region haplotypes defined from short (, 500 base-pair [bp]) sequences often limits inferences of population connectivity in marine turtles. Haplotype CM-A8, defined from 490-bp sequences, dominated the haplotype profiles of the 3 major green turtle (Chelonia mydas) rookeries in Brazil. Previous analyses based on 490-bp haplotypes did not detect differentiation between the northern rookeries of Atol das Rocas and Fernando de Norohna, but did indicate differentiation of the northern rookeries from Trindade Island in the south. We reexamined the stock structure of the Brazilian green turtle rookeries using 817-bp control region and mitochondrial short tandem repeat (mtSTR) sequences. Nine 490-bp haplotypes were subdivided into 41 haplotypes by combining 817-bp and mtSTR sequences. Eight of the 14 CM-A8 turtles from Fernando de Noronha carried mtSTR haplotypes that were not detected in the larger rookeries. Pairwise exact tests indicated that the northern Brazilian green turtle rookeries of the Rocas Atoll and Fernando de Noronha are discrete populations with respect to female natal homing. Moreover, several apparently endemic markers in the 3 Brazilian green turtle nesting populations should improve resolution of future mixedstock analyses. Comparable data are needed from green turtle rookeries in the central and eastern Atlantic to assess structure and connectivity at the ocean basin scale.- Avaliação dos encalhes de tartarugas marinhas: um indicador estratégico para a conservação.(2013) GOLDBERG, D. W; PIRES, T. T; CASTILHOS, J. C; MARCOVALDI, M. A; LOPEZ, G. G; LIMA, E. P; BAPTISTOTTE, C
- Anthropogenic threats to the sea turtle populations along the Brazilian coast.(2012) BAPTISTOTTE, C; LOPEZ, G. G; REITH, D; SANTOS, M. R; BOLDRIN, M. A; WERNECK, M .R; BECKER, H; GOLDBERG, D. W; STAHELIN, G. D; MARCOVALDI, M. A; PIRES, T
- Not just another mixed stock analysis: green turtles of Espírito Santo, Brazil.(2010) NARO-MACIEL, E; MARTIN, M; BONDIOLI, A. C. V; ALMEIDA, A. P; TOREZANI, E; BAPTISTOTTE, C; MARCOVALDI, M. A; AMATO, G; DE SALLE, RIn the Southwestern Atlantic Ocean, sea turtles are exposed to myriad threats including disease, fisheries bycatch, and industrial or coastal development, but protected by effective conservation organizations. In Espirito Santo, Brazil, green turtles (Chelonia mydas) with relatively high incidence of fibropapillomatosis tumors routinely strand in the vicinity of the state capital, Vitória, a highly urbanized area that encompasses the effluent discharge channel of a local steel plant. This is also a particularly interesting population because of its relative proximity to the regionally important Trindade Island rookery, whose feeding grounds have not been convincingly identified to date. To investigate the population distribution of the at-risk turtles, we sequenced a segment of the mitochondrial control region (862 bp; n = 132). Eight mtDNA haplotypes were revealed, of which the most common were CMA-08 and CMA-05. Haplotypes CMA-06 and CMA-09 were each found in six individuals, and rare haplotypes CMA-03, CMA-10, CMA-23, and CMA-32 were also detected. Two kinds of "many-to-many" mixed stock analyses were carried out, taking into account or alternately disregarding source nesting population size. The same approach was taken with traditional MSAS ("one-to-many"), and the main differences between the "one-to-many" and "many-to-many" results are reported. The analyses that included population size and all available data were most consistent with expectations. We recommend caution when employing different mixed stock analysis methods, and emphasize the importance of exploring alternate ways of investigating the origins of mixed stocks, including modeling approaches. These data will provide insight into population isolation and conservation priorities necessary to establish whether areas should be managed as independent units or as regional populations, and will clarify questions of scale in conservation and management, providing a scientific basis for conservation prioritization.
Item Intervalos internidais de tartarugas-de-pente (Eretmochelys imbricata) por telemetria satelital(2018) BELLINI, C.; SANTOS E. A. P.; RAMOS, R.; MARCOVALDI, M. A; SANTOS, A. J. B.Item Home range for hawksbill turtles in Brazil: new insights through satellite telemetry(2018) BELLINI, C.; SANTOS E. A. P.; RAMOS, R.; MARCOVALDI, M. A; SANTOS, A. J. B.Item An overview of Projeto TAMAR-IBAMA'S activities in relation to the incidental capture of sea turtles in the Brazilian fisheries.(2002) THOMÉ, J. C. A; MARCOVALDI, M. A; MARCOVALDI DEI, G. G; BELLINI, C; GALLO, B. M. G; LIMA, E. H. S. M; SILVA DA, A. C. C. D; SALES, G.; BARATA, P. C. RProjeto TAMAR-IBAMA, the Brazilian Sea Turtle Conservation Program, is a network of 20 conservation stations that together protect over 1,000 km of Brazilian coastline on the mainland and on three oceanic islands. TAMAR was created in 1980, and initially focused its efforts on nesting beaches. Since 1990, a significant proportion of TAMAR's field activities have been focused on sea turtle feeding areas. Five species of sea turtles are found and nest in Brazil: the green turtle (Chelonia mydas, CM), the loggerhead (Caretta caretta, CC), the hawksbill (Eretmochelys imbricata, El), the olive ridley (Lepidochelys olivacea, LO) and the leatherback (Dermochelys coriacea, DC). Several nesting beaches and feeding areas are located near important fishing and/or shrimping grounds, where sizeable industrial fishing fleets operate. Moreover, artisanal fishing is a key livelihood for many coastal communities. Therefore, there is significant interaction between sea turtles and fishing gear around those areas, and the successful conservation of sea turtles by TAMAR must also involve actions to reduce incidental captures of sea turtles in fishing activities. Furthermore, since 1998 TAMAR has been collecting data on the level of sea turtle capture by the pelagic longline fishery off the Brazilian coast, which is a new frontier for conservation activities. Different actions have been implemented by TAMAR in each region in Brazil, depending on local conditions and available funds. Here, we present an overview of TAMAR's activities regarding the incidental capture of sea turtles by Brazilian fisheries.Item Hawksbill turtles in Brazil(2006-04) MARCOVALDI, M. A; THOMÉ, J. C; LOPEZ, G. G; SOARES, L. SItem Evaluation of interaction between sea turtles and pelagic longline fisheries in Brazil(2007-02) MARCOVALDI, M. A; SALES, G; THOME, J. C. A; SILVA, A. C. C. D; GIFFONI, B. B