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First assessment of passive acoustics as a tool to monitor the endangered Mediterranean monk seal in the Madeira Archipelago (Portugal)
Munoz-Duque, S.; Vieira, M.; Fonseca, P.J.; Quintella, B.; Charrier, I.; Monteiro, J.G.; Fernandez, M.; Silva, R.; Amorim, M.C.P. (2024). First assessment of passive acoustics as a tool to monitor the endangered Mediterranean monk seal in the Madeira Archipelago (Portugal). Aquat. Conserv. 34(2): e4100. https://dx.doi.org/10.1002/aqc.4100
In: Aquatic Conservation: Marine and Freshwater Ecosystems. Wiley: Chichester; New York . ISSN 1052-7613; e-ISSN 1099-0755
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoorden
    Monachus monachus (Hermann, 1779) [WoRMS]; Pinnipedia [WoRMS]
    Marien/Kust
Author keywords
    conservation; Lobo-Marinho; Mediterranean monk seal; passive acoustic monitoring; Pinnipedia; underwater vocalization
Auteurs  Top 
  • Muñoz-Duque, S.
  • Vieira, M.
  • Fonseca, P.J.
  • Quintella, B.
  • Charrier, I.
  • Monteiro, J.G.
  • Fernandez, M.
  • Silva, R.
  • Amorim, M.C.P.
Abstract
    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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