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Research Paper | August 1, 2018

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Benthic marine gastropods and bivalves on the intertidal zones of Butuan Bay, Agusan del Norte, Northeastern Mindanao, Philippines

Arieyl C. Jamodiong, Maria Lourdes Dorothy G. Lacuna

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J. Bio. Env. Sci.13(2), 128-140, August 2018


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Benthic molluscs inhabiting the intertidal zones have always been vulnerable to anthropogenic activities, most specifically the edible ones, because they are often harvested as sources of food and additional income. Due to this, there is a dire need in monitoring and obtaining information regarding the diversity, abundance and distribution of intertidal molluscs in Butuan Bay, Philippines. Assessments were done using the transect-quadrat methods. Twenty seven molluscan species were identified, with 11 species classified under Class Bivalvia, while 16 species are categorized as Class Gastropoda. All identified bivalves were edible, while only 4 of the gastropod species were of commercial value. Results of the diversity profiles and abundance showed station 3 to be highly diverse and abundant, although half of the population were considered non-edible. On the contrary, low species diversity and low abundance were observed in stations 1 and 2. It is suggested that heavy anthropogenic activities may be responsible for the dominance of non-edible molluscs assemblage in station 3, whereas the impact of uncontrolled gleaning activities may result to low species diversity in stations 1 and 2. The spatial distribution of each mollusc species exhibits preference to a specific stratum in the intertidal zones of the 3 sampling stations and it is believed that this may be related to their mode of feeding.


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