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SC/69B/SH/09Rev1
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Resource ID
22152
Access
Open
Document Number
SC/69B/SH/09Rev1
Full Title
Assessing movement rates of Southwest Atlantic southern right whales between Argentina and Brazil
Author
Macarena Agrelo, Justin Cooke, Olivier Gimenez, Karina Groch, Carina Mar n, Eduardo P. Renault-Braga, Mariano Sironi, Juan Pablo Torres-Florez, Florencia Vilches and Victoria Rowntree
Authors Summary
Updates have been added.
Publisher
IWC
Publication Year
2024
Abstract
The population of Southern Right Whales (SRWs) in the Southwest (SW) Atlantic has been
monitored separately for decades in their breeding areas of Argentina and Brazil. Recent evidence
has shown matches in individually photo-identified whales between Pen nsula Vald s, Argentina,
and southern Brazil. The present analysis aims to evaluate the dispersion of SRW individuals
between the two main breeding areas in the SW Atlantic. Applying multi-state capture-recapture
models to data from the consolidation of photo-identification catalogues of female SRWs between
1997 and 2017, we estimated movement rates between Argentina and Brazil and vice versa. By
using a subset of data, we investigated the influence of biological hypotheses, such as densitydependent
processes, breeding success, and gull harassment, on movement probabilities. Our
results reinforce the importance of combining data from Argentina and Brazil to adequately
evaluate the population size and trends of the entire population of SW Atlantic SRWs.