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Mark-recapture abundance estimate of tucuxi dolphins (Sotalia fluviatilis) in a lake system of the Central Amazon
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Orientador(es)
Resumo(s)
The tucuxi (Sotalia fluviatilis) is a small dolphin endemic to the Amazon River
basin. Because the abundance and trends are currently unknown for the species, this
study aimed to estimate its abundance in a lake system of the Central Amazon. A total
of 10 two-day sampling periods were carried out from March to June of 2013
throughout a 13.5 km2 area in the Mamiraua Reserve. In the 104 encounters with the
species, a minimum number of 389 dolphins were sighted and photographed, which
allowed the positive identification of 49 individuals. Mark-recapture models were used
to estimate an abundance of 119 individuals (95% CI = 105–150) (corrected for the
proportion of identifiable individuals). This is the first estimation of S. fluviatilis abundance
using mark-recapture analyses and, together with the photo-id catalog made
available, provides a useful reference for future studies regarding tucuxi dolphins.
Descrição
Palavras-chave
Brazilian Amazon Conservation Mamiraua Sustainable Development Reserve Mark-recapture analyses Photo-identification Tucuxi dolphins Varzea forest
Contexto Educativo
Citação
Marine Mammal Science, 32(1), 241–251. doi: 10.1111/mms.12254
Editora
Wiley-Blackwell