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Ryan Murray,Segundo Conales Jr.,Gonzalo Araujo,Jessica Labaja,Sally J. Snow,Simon J. Pierce,Angelique Songco,Alessandro Ponzo 국립중앙과학관 2019 Journal of Asia-Pacific Biodiversity Vol.12 No.1
Elasmobranchs are experiencing population declines worldwide because of anthropogenic stressors. Marineprotected areas (MPAs) have been shown to benefit mesopredatory species of shark. The Tubbataha ReefsNatural Park (TRNP) is a United Nations Educational, Scientific and Cultural Organization World Heritage Siteand the largest no-take MPA in the Philippines, yet information on the current status of elasmobranchs in thepark is limited. Here, we investigate the abundance and biodiversity of elasmobranchs in TRNP using underwater visual census (UVC) and baited remote underwater video (BRUV) surveys. Twenty UVC wereconducted in May 2015 (n ¼ 10) and June 2016 (n ¼ 10), documenting eight species of elasmobranchs with anaverage density of 7.18 sharks ha-1 for both years. A total of 113 successful BRUV surveys were conducted inTRNP between MarcheJune 2015 (n ¼ 47) and AprileJune 2016 (n ¼ 66). The BRUV surveys recorded 14species with an average catch per unit effort of 2.09 elasmobranchs per hour for both years. Both surveymethods report some of the highest densities of the grey reef shark Carcharhinus amblyrhynchos and thewhitetip reef shark Triaenodon obesus documented worldwide. This study underlines the importance of large,well-managed MPAs such as TRNP for the conservation of reef-associated elasmobranchs.