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Previous issue date: 2010-03-19 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / Four areas are known as of frequent usage by Guiana dolphins (Sotalia guianensis) in the south coast of Rio Grande do Norte state, northeast Brazil: Tabatinga, Pipa, Lagoa de Guara?ras and Baia Formosa. This extension of 40 km of shoreline is under increasing anthropogenic impacts due to continuous development of the coastal areas and vessel traffic. The objective of this study was to investigate aspects of population biology and habitat use of the population of Sotalia guianensis in the south coast of Rio Grande do Norte. It was applied the photo-identification technique and posterior methods of capture-recapture for population estimation (POPAN extension in MARK). The distribution, movement and site fidelity of the
dolphins were analyzed trough the geographic information system (GIS) and group characteristics and behavior trough non-parametric statistics. Field work was conducted on
board a 10m motor vessel from March 2008 to March 2009. Photo-identification effort was 329h with 113h of direct observation of the dolphins. The population estimatives for each
area: Tabatinga: 75 (63-92); Pipa 105 (88-129); Lagoa de Guara?ras: 27 (18-54) e Baia Formosa: 112 (89-129) individuals. Total population estimative was: 223 (192 a 297). High
site fidelity was detected for only part of the population (<15%) as low site fidelity and transients individuals were also detected (>20%). It was observed frequent movements
between Tabatinga, Lagoa de Guara?ras and Pipa, but not Ba?a Formosa. This suggests a division in two communities along this shore extension: one in Pipa and other in Ba?a Formosa. Group size was small, most groups with up to 10 dolphins. The areas were use intensively, only in Lagoa de Guara?ras dolphins were not seen in all field trips. Lagoa de Guara?ras is an area used by small groups exclusively for foraging. In Tabatinga and Pipa
dolphins concentrated close to the shore, in the inner sector of the area and the main activity is also foraging. Significant larger groups were seen in socializing behavior but there was no
difference in group size between the inner and external sectors of the area. The presence of calves and juveniles were significant greater in the inner areas of Tabatinga and Pipa,
confirming the hypothesis that these beaches are also used for parental care. In Baia Formosa dolphins concentrated in the outer sector and foraging was also predominant. Significant
larger groups were seen in the outer sector, mainly engaged in mixed behaviors of travel/foraging, possibly in some kind of group foraging. Calves and juveniles were significant more present in the outer sector where group size was also larger. In general there was no difference in area usage and period of the day. Sotalia guianensis has characteristics that make the species vulnerable to human activities such as small population concentrated in patches of suitable habitats restrict to coastal areas. We hope that this study bring new information for the species and help for the adequate management of the area in order to assure the presence of the dolphins as well as its behavior pattern and gene flow betweencommunities. / Quatro ?reas s?o conhecidas como de freq?ente uso pelo boto-cinza (Sotalia guianensis) no litoral sul do Rio Grande do Norte: Tabatinga, Pipa, Lagoa de Guara?ras e Ba?a Formosa. Esta
extens?o de 40km de costa est? sob crescente impacto antr?pico devido ao aumento de constru??es e tr?fego de embarca??es. Este estudo teve por objetivos investigar aspectos populacionais e o uso do h?bitat de uma popula??o de Sotalia guianensis no litoral sul do Rio Grande do Norte. Foi empregada a t?cnica de foto-identifica??o e posteriormente m?todos de captura-recaptura para as estimativas populacionais (extens?o POPAN do programa MARK). A movimenta??o e grau de fidelidade dos indiv?duos foram investigados utilizando sistema de informa??o geogr?fica e an?lises estat?sticas n?o param?tricas. As coletas de campo foram realizadas a bordo de uma embarca??o entre mar?o de 2008 a mar?o de 2009. No total foram 329h de esfor?o de foto-identifica??o e 113h de esfor?o efetivo nas quatro ?reas estudadas. As estimativas foram: Tabatinga: 75 (63-92); Pipa 105 (88-129); Lagoa de Guara?ras: 27 (18-54) e Ba?a Formosa: 112 (89-129) indiv?duos. A popula??o total estimada foi: 223 (192 a 297). A fidelidade a ?rea foi alta por apenas parte da popula??o (<15%), sendo tamb?m observados indiv?duos de fidelidade baixa e transientes (>20%). Foi constatada grande movimenta??o de indiv?duos das ?reas de Tabatinga, Lagoa de Guara?ras e Pipa, mas n?o de Ba?a Formosa, o que sugere uma divis?o de duas comunidades diferentes ao longo do litoral uma em Pipa e outra em Ba?a Formosa. O tamanho dos grupos foi pequeno, com grupos mais freq?entes at? 10 animais. O forrageio foi predominante e os animais usaram a ?rea intensivamente, apenas na Lagoa de Guara?ras os indiv?duos n?o foram vistos todos os dias. A Lagoa de Guara?ras ? um local exclusivo de forrageio de grupos pequenos. Grupos maiores foram visto fora da lagoa, pr?ximo ? entrada. Em Pipa e Tabatinga os animais se concentraram nas enseadas,
principalmente em forrageio. Grupos maiores foram vistos em socializa??o, mas n?o houve diferen?as no tamanho dos grupos quando comparado as enseadas com setores mais externos.
J? em Ba?a Formosa os animais se concentraram mais no setor externo. Nestas ?reas os grupos maiores estavam engajados em comportamentos de deslocamento e forrageio. A presen?a de imaturos foi maior nas enseadas em Tabatinga e Pipa, confirmando a sugest?o destas enseadas serem importante para o cuidado parental. No geral, n?o houve diferen?as
quanto ao per?odo do dia que os animais usaram os diferentes setores das ?reas. Sotalia guianensis apresenta v?rias caracter?sticas que a tornam vulner?vel, como pequenas
popula??es concentradas em manchas de h?bitat favor?vel ao longo da costa. Espera-se que os dados deste trabalho, al?m de oferecer novas informa??es para o conhecimento te?rico da
esp?cie, sirvam de subs?dios para um manejo adequado da ?rea no sentido de assegurar a perman?ncia dos animais na ?rea, seu padr?o comportamental natural e o fluxo gen?tico entre
as comunidades
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/17301 |
| Date | 19 March 2010 |
| Creators | Paro, Alexandre Douglas |
| Contributors | CPF:90501420444, http://lattes.cnpq.br/6566269393468726, Lodi, Liliane Ferreira, CPF:90800915704, http://lattes.cnpq.br/0158188163167191, Chellappa, Sathyabama, CPF:15644812472, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4787789Y9, Ferreira, Renata Gon?alves |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Psicobiologia, UFRN, BR, Estudos de Comportamento; Psicologia Fisiol?gica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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