Mollusk Species Diversity in Mangrove Ecosystems of Northern Samar: Basis in the Design of Mangrove Rehabilitation Programs
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Abstract
This study was conducted to assess the mollusks species diversity in the mangrove ecosystems of Northern Samar which included coastline of the University of Eastern Philippines (Study Site I), Brgy. Langob, Laoang, Northern Samar (Study Site II), Sitio Bel-at, Brgy Progress, Biri, Northern Samar (Study Site III) and Lalaguna Mangrove Protected Area in San Isidro, Lavezares, Northern Samar (Study Site IV). In the four (4) study sites, a comprehensive survey revealed the presence of ten (10) distinct mangrove species, which were classified into five (5) diverse families. A remarkable total of 343 individual mangroves were recorded during the study. Forty-nine (49) mollusk species were identified belonging to 17 different families of Class Gastropoda, six (6) families of Class Bivalvia and one (1) of Class Polyplacophora with a total of 935 individuals of mollusks. Shannon diversity indices showed that mangrove species in study site II had a greater diversity index of 1.7109 compared to the other sites that have lesser diversity. Simpson’s species dominance should the highest value of 0.4425 in study site IV. Based also on the Shannon diversity indices, the mollusk highest number of individual species of 2.6341 (29 species) was in study site I which is considered low diversity. The Simpson’s species dominance had the highest value of 0.3349 in study site II, while the species richness had the highest value of 1.773 in study sites III and IV, and species evenness had the highest value of 0.7823 in study site I. Mangrove rehabilitation/restoration program could therefore be implemented by the local government units in Northern Samar and the University of Eastern Philippines.
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References
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