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First assessment of passive acoustics as a tool to monitor the endangered Mediterranean monk seal in the Madeira Archipelago (Portugal)
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Resumo(s)
1. The rarest seal and the world's most endangered pinniped species, the
Mediterranean monk seal (Monachus monachus), has a small and isolated
population in the Madeira Archipelago (Portugal). This species tends to be
extremely wary of humans and, therefore, very difficult to approach and study.
2. Passive acoustic monitoring (PAM) is a non-invasive, cost-effective tool that can
be a valuable complement for the traditional monitoring methods, providing
insight for effective conservation of the seal in the Madeira Archipelago.
3. In this pilot study, custom-designed autonomous underwater recorders were
deployed in two marine protected areas (Garajau Partial Nature Reserve and the
Desertas Islands Nature Reserve) to assess the potential of PAM to detect and
monitor this elusive and endangered species in the Madeira Archipelago.
4. Two call types putatively produced by M. monachus were detected in a subsample
of audio files recorded over a 3-month acoustic deployment; these call types
share similarities with the /growl/ and /hiccup/ recently described for M.
monachus in a Mediterranean population. The most common sound type detected
was the low-frequency growl. No obvious pattern was found in the abundance of
sounds according to sampling date, and no significant difference was found in the
abundance of sounds in different periods of the day.
5. The ability to detect the species' underwater vocalizations with PAM opens the
possibility of future monitoring plans based on data obtained from audio
recordings. These data can provide relevant information for conservation, namely,
on the presence and abundance of the seals.
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Citação
Muñoz-Duque, S., Vieira, M., Fonseca, P.J., Quintella, B., Charrier, I., Monteiro, J.G. et al. (2024). First assessment of passive acoustics as a tool to monitor the endangered Mediterranean monk seal in the Madeira Archipelago (Portugal). Aquatic Conservation: Marine and Freshwater Ecosystems, 34(2), e4100. https://doi.org/10.1002/aqc.4100
Editora
Wiley