期刊
MARINE MAMMAL SCIENCE
卷 29, 期 2, 页码 293-311出版社
WILEY
DOI: 10.1111/j.1748-7692.2012.00571.x
关键词
population parameters; mark-recapture models; abundance; survival rates; temporary emigration; Tursiops truncatus; robust design
资金
- CNPq (National Counsel of Technological and Scientific Development)
- FAPESC (Fundacao de Apoio a Pesquisa Cientifica do Estado de Santa Catarina)
- FBPN (Fundacao O Boticario de Protecao a Natureza)
- Cetacean Society International
- Idea Wild
A subgroup of a population of Tursiops truncatus in southern Brazil is known for a cooperative behavior with artisanal fishermen whereby the dolphins shoal fish towards net-casting fishermen. Combining photo-identification data collected between September 2007 and 2009 with mark-recapture and Pollock's robust design models, we assessed abundance within seasons and survival and temporary emigration rates of dolphins between seasons. We also reanalyzed a previous data set collected during 19891991, and Cormack-Jolly-Seber models were applied to estimate survival rates for each of the study periods. The abundance of marked cooperative dolphins varied between seasons from 18 (CI: 1724) to 21 (CI: 2024). The total abundance varied from 59 in the winter of 2008 (CI: 4972) to 50 in the autumn of 2009 (CI: 4062). The annual adult survival was estimated to be 0.917 (CI: 0.8760.961), close to that estimated from data collected in the 1990s (0.941; CI: 0.8880.998). The emigration probability was low (0.031; CI: 0.0110.084) and different capture probabilities between the cooperative and noncooperative dolphins indicated a degree of behavioral segregation. The precision of our estimates is likely to provide sufficient power to detect population change, but we recommend a precautionary management approach to protect this vulnerable dolphin community and its unique cooperative feeding tradition.
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