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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 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.Item Green Turtle, Chelonia mydas in the Island of Poilão, Bolama-Bijagós Archipelago, Guinea-Bissau, West Africa(1998) FORTES, O; PIRES, A.J; BELLINI, CThe Bijagós Archipelago consists of approximately 80 islands, of which only 21 are permanently inhabited, and is located between 10o 43' - 11o 40' N and 15o 20' - 17o 00' E, occupying an area of approximately 11 000 km2 (Fig. 1). Sand banks and mud flats make up a large part of the area. In April 1996, the Bijagós Biosphere Reserve was created to protect the unique natural resources, biodiversity and high natural productivity of the region. The Reserve allows for sustainable development and the integration of the Bijagós community with the environment.- The Interplay of Homing and Dispersal in Green Turtles: A Focus on the Southwestern Atlantic(Journal of Heredity, 2012-10-08) NARO-MACIEL, E; BONDIOLI, A.C.V; MARTIN, M; ALMEIDA, A.P; BAPTISTOTTE, C; BELLINI, C; MARCOVALDI, M.A; SANTOS, A.J.B; AMATO, GCurrent understanding of spatial ecology is insufficient in many threatened marine species, failing to provide a solid basis for conservation and management. To address this issue for globally endangered green turtles, we investigated their population distribution by sequencing a mitochondrial control region segment from the Rocas Atoll courtship area (n = 30 males) and four feeding grounds (FGs) in Brazil (n = 397), and compared our findings to published data (nnesting = 1205; nfeeding = 1587). At Rocas Atoll, the first Atlantic courtship area sequenced to date, we found males were differentiated from local juveniles but not from nesting females. In combination with tag data, this indicates possible male philopatry. The most common haplotypes detected at the study sites were CMA-08 and CMA-05, and significant temporal variation was not revealed. Although feeding grounds were differentiated overall, intra-regional structure was less pronounced. Ascension was the primary natal source of the study FGs, with Surinam and Trindade as secondary sources. The study clarified the primary connectivity between Trindade and Brazil. Possible linkages to African populations were considered, but there was insufficient resolution to conclusively determine this connection. The distribution of FG haplotype lineages was nonrandom and indicative of regional clustering. The study investigated impacts of population size, geographic distance, ocean currents, and juvenile natal homing on connectivity, addressed calls for increased genetic sampling in the southwestern Atlantic, and provided data important for conservation of globally endangered green turtles.
Item Avaliação do Estado de Conservação da Tartaruga Marinha Chelonia mydas (Linnaeus, 1758) no Brasil.(2011-01-27) ALMEIDA, A. de P; SANTOS, A. J. B; THOMÉ, J. C. A; BELLINI, C; BAPTISTOTTE, C; MARCOVALDI, M. Â; SANTOS, A. S. dos; LOPEZ, Milagros