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Previous issue date: 2008-02-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior-CAPES / This study had two main objectives: assess information about site fidelity and abundance
estimation of Sotalia guianensis in Sepetiba Bay (22o35'S, 44o03'W), State of Rio de Janeiro,
southeastern Brazil. To evaluate site fidelity, we used a photo-identification catalogue from
February 1994 and July 2006, which have 217 identified individual dolphins. Seventy-nine
animals (36.4%) were resighted at least once during the study period, and the average interval
between resightings was 40.6 ? 31.1 months. Large numbers of mother-and-calf pairs were
recorded throughout the 12 years of study, and new individuals were constantly identified in the
area as shown by the photographic records. The results suggest that part of the dolphin population
depends on the habitat provided by Sepetiba Bay for feeding and for the purposes of
reproduction, whilst other members use it only for short periods of time. To estimate the
population size, a new catalogue was made from 14 boat-based surveys from April 2006 to April
2007. We took 9,990 photographs of dolphin and, of these, 2,567 images were of sufficient
quality for analysis. We identified and cataloged 382 dolphins from distinctive nicks and notches
on their dorsal fins. 153 dolphins were photographed on more than one occasion. Estimates of
population size were obtained by using capture-recapture models for closed population. The
resulting estimates, scaled to account the proportion of marked dolphins in the population (0.53),
are 989 animals (IC 95% 965-1057) to Schnabel Estimator; 1060 animals (IC 05% 1004-1117) to
Schumacher-Eschmeyer Estimator; 1043 animals (IC 95% 999-1115) to Model Mt; and 1085
animals (IC 95% 1016-1154) to Model Mth. These results represent the largest population ever
reported to Sotalia guianensis. / Este estudo teve por objetivos principais acessar informa??es a respeito da fidelidade de habitat e
estimar o tamanho da popula??o de Sotalia guianensis da Ba?a de Sepetiba (22?35?S, 44?03?W)
Estado do Rio de Janeiro, sudeste do Brasil. Para verificar a fidelidade de habitat, foi utilizado o
cat?logo de fotografias do per?odo de fevereiro de 1994 a julho de 2006 onde est?o fotoidentificados
217 botos, sendo que 79 destes (36,4%) foram reavistados pelo menos uma vez
durante esses 12 anos e o intervalo m?dio entre reavistagens foi de 40,6 ? 31,1 meses. A presen?a
de pares de m?es-filhotes foi numerosa ao longo do per?odo de estudo e novos indiv?duos foram
constantemente identificados na ?rea. Os resultados sugerem que parte desta popula??o depende
substancialmente do habitat fornecido pela Ba?a de Sepetiba, tanto para alimenta??o quanto para
fins de reprodu??o, apesar de haver indiv?duos que usam menos esta ?rea. Para estimar o
tamanho da popula??o, um novo cat?logo foi iniciado, produzido a partir de 14 sa?das de campo
de Abril de 2006 a Abril de 2007. Foram tomadas 9990 fotografias dos golfinhos, e destas, 2567
imagens eram de qualidade ?tima o suficiente para as an?lises. 382 golfinhos foram identificados
atrav?s de marcas e entalhes em suas nadadeiras dorsais. 153 indiv?duos foram fotografados em
mais de uma ocasi?o. As estimativas populacionais foram obtidas usando modelos de marca??orecaptura
para popula??es fechadas. As estimativas resultantes, calculadas com a propor??o de
animais marcados na popula??o (0,53) foram de 989 animais (IC 95% 965-1057) para o
Estimador de Schnabel; 1060 animais (IC 05% 1004-1117) para o Estimador de Schumacher-
Eschmeyer; 1043 animais (IC 95% 999-1115) para o Modelo Mt; e 1085 animais (IC 95% 1016-
1154) para o Modelo Mth. Esses resultados representam a maior estimativa populacional para
Sotalia guianensis em toda sua ?rea de ocorr?ncia.
| Identifer | oai:union.ndltd.org:IBICT/oai:localhost:jspui/1275 |
| Date | 29 February 2008 |
| Creators | Nery, Mariana Freitas |
| Contributors | Sim?o, Sheila Marino, Andriolo, Artur, Ara?jo, Alexandre Fernandes Bamberg de |
| Publisher | Universidade Federal Rural do Rio de Janeiro, Programa de P?s-Gradua??o em Biologia Animal, UFRRJ, Brasil, Instituto de Ci?ncias Biol?gicas |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Portuguese |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da UFRRJ, instname:Universidade Federal Rural do Rio de Janeiro, instacron:UFRRJ |
| Rights | info:eu-repo/semantics/openAccess |
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