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Survival and abundance of short-finned pilot whales in the archipelago of Madeira, NE Atlantic
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Orientador(es)
Resumo(s)
Estimates of population parameters for the short-finned pilot whale, Globicephala
macrorhynchus, are scarce in literature, contributing to an International Union for
Conservation of Nature (IUCN) status of Data Deficient. In this study, photo-identi fication data collected over 7 yr from Madeira were used to estimate for the first time
survivorship, capture probability, and abundance in this species using mark-recap ture methodology. The Cormack-Jolly-Seber model estimated that the adult island associated (i.e., resident and regular visitor) whales had a constant survival rate of
0.960 (95% CI: 0.853–0.990) and an annual capture probability varying between
0.372 (CI: 0.178–0.619) and 0.843 (CI: 0.619–0.947). A parameterization of the
Jolly-Seber model estimated that 140 island-associated whales (CI: 131–151) used
the area throughout the course of the study. Based on a closed population model, the
most precise (lower CV) annual estimate of the total number of pilot whales using
the southern and eastern waters of Madeira (~900 km2
) in a 3 mo period covering
summer/autumn was 334 animals (CI: 260–437). No trend was observed. Despite
including biases, the approach used in this study provided plausible estimates of
population parameters, which can contribute to the regional conservation strategies.
Descrição
Palavras-chave
Globicephala macrorhynchus Heterogeneity Island-associated Mark-recapture Photo-identification Population models Population parameters Transience Madeira (Portugal) . Faculdade de Ciências da Vida
Contexto Educativo
Citação
Alves, F., Dinis, A., Nicolau, C., Ribeiro, C., Kaufmann, M., Fortuna, C., & Freitas, L. (2015). Survival and abundance of short‐finned pilot whales in the archipelago of Madeira, NE Atlantic. Marine Mammal Science, 31(1), 106-121. DOI: 10.1111/mms.12137
Editora
Wiley