Distribution of the reef manta ray Mobula alfredi and the oceanic manta ray Mobula birostris in the Philippines: a collaborative effort for conservation.

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ID: 280803
2023
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Abstract
Little is known about manta ray population size, structure and connectivity in the Philippines. In collaboration with dive operators, non-governmental organizations and authorities, sightings of manta rays were collated into a single national database. Using in-water photographs and videos gathered through citizen science and dedicated research efforts, this study compiled sightings between 2004 and 2020, showing 22 separate sites throughout the archipelago with manta rays present. A total of 392 individual reef manta rays (Mobula alfredi) and 107 oceanic manta rays (Mobula birostris) were identified from the collected footage. Four specific sites in the provinces of Masbate and Palawan together hosted 89% of all identified individuals and accounted for 95% of sightings, highlighting these areas are key aggregation sites. This study also reports the movements of M. birostris within the Philippines, based on photo-identification of three individuals moving 150 km between Cebu and Masbate. Despite the growing number of recreational divers in Daanbantayan and San Jacinto, an 80% decline in M. birostris sightings was observed at these sites. To ensure effective future conservation, it is recommended that efforts focus on the identification and protection of manta ray hotspots and migratory corridors, the creation of a sustainable tourism framework and, most important, the implementation of mitigation strategies to reduce fisheries interactions.
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Authors Rambahiniarison, Joshua;Agustines, Ariana;Alexopoulos, Konstantinos;Araujo, Gonzalo;Armstrong, Asia O;Arnold, Shannon;Barruga, Aldrin;Cañete, Titus;Conales, Segundo;Delijero, Kymry;Enolva, Nonie P;Flam, Anna L;Keane, Eliya;Labaja, Jessica;Legaspi, Christine G;Murie, Calum;Murray, Ryan;Oliver, Simon P;Pierce, Simon J;Ponzo, Alessandro;Rohner, Christoph A;Schifferer, Rosanna;Snow, Sally;Spakowski, Martina;Stevens, Guy M W;Tilgel, Timur;Wong, Jessica N C;Yaptinchay, Arnel Andrew;Barr, Yotam;
Journal Journal of fish biology
Year 2023
DOI
10.1111/jfb.15283
URL
Keywords
conservation management migratory corridors species distribution habitat use photo-identification

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