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SC/69B/SM/09
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Resource ID
22169
Access
Open
Document Number
SC/69B/SM/09
Full Title
ABUNDANCE ESTIMATES AND MORTALITY OF FRANCISCANA DOLPHINS IN THE FRANCISCANA MANAGEMENT AREA BABITONGA, SOUTH OF BRAZIL
Author
Cremer, M. J.; Sucunza, F.; Maieski, K.; Gurgel, R. M.; Moreira, J. M. N.; Teixeira, G.; Ruthes, A. M.; Vieira, J.; Holz, A. C.; Dotto, A. C.; Castilho, P. V.; Paitach, R. L.
Authors Summary
The first abundance estimates for the Franciscana Management Area Babitonga - FMA Babitonga was conducted for the period of 2000 to 2003, resulting in 50 individuals (CI = 28-89; CV = 0.30). Around ten years later, a new estimation for the same general region was presented but for a different survey area, making estimates non-comparable (n = 53 individuals; CV = 0.22). Considering the growing anthropic pressure in the area, the objective of this work was to analyze the status of this population, presenting a new abundance estimate, after 12 years, and the profile of individuals found dead within the bay over 21 years (2001 to 2021). It is clear that FMA Babitonga is certainly the smallest population of franciscana dolphins in the world, and there are signs that it is declining. Despite the uncertainty associated with the new abundance computed in this study, the mortality that has been recorded over the last 21 years strongly indicates the possibility of decline.
Publisher
IWC
Publication Year
2024
Abstract
This paper present a new abundance estimate for franciscana dolphins in FMA Babitonga, after 12 years, and the profile of individuals found dead within the bay over 21 years (2001 to 2021).