Environmental DNA (eDNA) metabarcoding and fish visual census reveals the first record of Doboatherina magnidentata in the Philippines

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JOHN ARLU BAUTISTA
JANECE JEAN MANUBAG
NANETTE HOPE SUMAYA
JOEY GENEVIEVE MARTINEZ
SHARON ROSE TABUGO

Abstract


Abstract. Bautista JA, Manubag JJ, Sumaya NH, Martinez JG, Tabugo SR. 2023. Environmental DNA (eDNA) metabarcoding and fish visual census reveals the first record of Doboatherina magnidentatain the PhilippinesBiodiversitas 24: 3063-3072Biodiversity monitoring is the cornerstone for conserving marine fish species. However, classical methods, like the Fish Visual Census (FVC), are often limited due to sampling difficulties, the occurrence of rare and cryptic organisms, and reliance on a taxonomic expert for species identification. Recently, environmental DNA (eDNA) metabarcoding has been suggested as a non-invasive, powerful tool for biomonitoring. This study evaluates the eDNA approach as complementary tool for the FVC data in species detection and identification of important marine fishes from the marine sanctuary of Dalipuga, Iligan City, Philippines. The findings obtained through the eDNA approach provide insights into identifying significant fish species. Notably, the presence of the Hippocampus kuda Bleeker, 1852 (yellow seahorse), categorized as a vulnerable and threatened species, was detected. Additionally, the study identified Herklotsichthys quadrimaculatus Rüppell, 1837 (bluestripe herring), a native species to the Philippines that may pose potential risks to humans and the ecological balance. Furthermore, two demersal fish species, namely Large-scale whiting (Sillaginops macrolepis Bleeker, 1858) and Large-scale mullet (Planiliza macrolepis Smith, 1846), were also detected. The eDNA approach also delineated the morphologically cryptic fishes from Scaridae (parrotfishes) and Mugilidae (mullet fish) taxa to the species level. The highlight of this study was the detectionof the new Indo-pacific atherinomorine fish species Doboatherina magnidentata, which to the best of our knowledge, was the first record in the Philippine marine waters. Despite the efficiency of the eDNA metabarcoding in fish species detection and identification, the viability of eDNA in the marine environment and biases of the primer limit this method. Thus, the classical method must complement the molecular approach for better taxonomic resolution and community analysis. Future studies were also recommended to use a multigene eDNA approach to improve taxonomic sensitivity and reduce primer biases.


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Author Biographies

JOHN ARLU BAUTISTA, Department of Biological Sciences, Mindanao State University-Iligan Institute of Technology. Andres Bonifacio Avenue, Tibanga, 9200 Iligan City, Philippines

Graduate Student

JANECE JEAN MANUBAG, Local Government Unit of Iligan City. Buhanginan Hills, Palao, 9200 Iligan City, Philippines

Freelancer Biologist, Volunteer for the Local Government Unit of Iligan City (LGU-Iligan)

NANETTE HOPE SUMAYA, Department of Biological Sciences, Mindanao State University-Iligan Institute of Technology. Andres Bonifacio Avenue, Tibanga, 9200 Iligan City, Philippines

Associate Professor, Department of Biological Sciences, Mindanao State University-Iligan Institute of Technology, Iligan City, 9200 Philippines

JOEY GENEVIEVE MARTINEZ, Department of Biological Sciences, Mindanao State University-Iligan Institute of Technology. Andres Bonifacio Avenue, Tibanga, 9200 Iligan City, Philippines

Professor

Department of Biological Sciences, Mindanao State University-Iligan Institute of Technology, Iligan City, 9200 Philippines

SHARON ROSE TABUGO, Department of Biological Sciences, Mindanao State University-Iligan Institute of Technology. Andres Bonifacio Avenue, Tibanga, 9200 Iligan City, Philippines

Professor

Department of Biological Sciences, Mindanao State University-Iligan Institute of Technology, Iligan City, 9200 Philippines;

Molecular Systematics and Conservation Genomics Laboratory, Center for Biodiversity Studies and Conservation (CBSC), Premier Research Institute of Science and Mathematics (PRISM), MSU-Iligan Institute of Technology, Iligan City, 9200 Philippines

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