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SC/69A/SM/05
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Resource ID
20066
Access
Open
Document Number
SC/69A/SM/05
Full Title
Progress report on the research and conservation of Lahille’s bottlenose dolphins - 2022
Author
Pedro F. Fruet, Fábio G. Daura-Jorge, Paula Laporta, Mariano Coscarella, Els Vermeulen, Paulo H. Ott, Leonardo Berninsone, Rodrigo Cezar Genoves, Ignacio B. Moreno, Mauricio Failla, Paulo A.C. Flores, Miguel Iñíguez, Dan Jacobs Pretto, Rodrigo Macha
Authors Summary
This document report progresses on the actions taken for the research and conservation of Lahille’s dolphin in 2022 in the context of six previous recommendations made by the SC. There were no changes on the conservation status of the subspecies, and little progress was made to update information in Argentina. Enforcement actions to combat illegal fisheries is failing along the distribution of the subspecies. Mortality in coastal beaches of Patos Lagoon (n=8) followed the seasonal pattern of artisanal fisheries effort in the area. Bycatch was also likely in Torres and Tramandaí and zero in Laguna. In Uruguay, dolphins with severe injuries potentially caused by fishing nets has been recorded in recent years. Prevalence of LLD increased from 9% in 2011 to ~19% in 2022 in Laguna, and new cases were recorded for Torres and Tramandaí. An increase trend in the POPs concentration in adult male dolphins from Patos Lagoon was found, with ΣPCB concentrations much above the thresholds established in the literature regarding PCB toxicity. Mark-recapture models in a Robust Design and Multistate frameworks were fitted to data from five sampled sites in Southern Brazil-Uruguay, collected between 2019 and 2022. Survival and abundance estimates are available. A PVA was run under different management scenarios. Current conditions do not seem sustainable in the long-term, predicting the extinction of some local populations and a dramatic reduction of the metapopulation. Using mark-recapture data and PVA, the extinction risk of the Southern Brazil-Uruguay population was assessed against IUCN criteria. Preliminary evaluation suggested CR under sub-criteria C1 and C2ai, which would downgrade the conservation status of Lahille's dolphins from EN to CR in Brazil. Offshore wind farms were identified as a potential new threat to Lahille’s bottlenose dolphin in Brazil
Publisher
IWC
Publication Year
2023