Snapshot sample of gastropods and bacterial antagonistic activity in areas of a mangrove ecosystem prone to disturbance from the Iloilo River, Iloilo, Philippines

Wennamae P. Tupas

Department of Sciences, College of Arts and Sciences, Western Institute of Technology, Philippines

Froilyne Ernestine C. Estrobo

Department of Sciences, College of Arts and Sciences, Western Institute of Technology, Philippines

Aze M. Tabiano

Department of Sciences, College of Arts and Sciences, Western Institute of Technology, Philippines

Joswa G. Billonid

Department of Biology, College of Arts, Sciences, and Education, University of San Agustin, Philippines

Cindy D. Armada

Institute of Fish Processing Technology, College of Fisheries and Ocean Sciences, University of the Philippines Visayas, Philippines

Rhyxy Anthony G. Mamon

Department of Sciences, College of Arts and Sciences, Western Institute of Technology, Philippines

DOI: https://doi.org/10.14456/apst.2025.28

Keywords: Rapid assessment Antagonistic activity Mangrove-associated Gastropods Mangrove ecosystem

Abstract

Mangrove ecosystems and their macro and microorganisms are particularly vulnerable to anthropogenic activities. Using a snapshot sampling strategy, this study assessed mangrove-associated gastropods and used the agar plug method to screen the antagonism of bacterial isolates against Escherichia coli ATCC 25922 and Staphylococcus aureus ATCC 25923 from a mangrove ecosystem most prone to human disturbance at the Iloilo River, Iloilo, Philippines. The present study recorded largely consistent physicochemical parameters (water and soil) with pre-existing data for this area and documented the presence of four gastropod taxa: Cerithidea sp., Chicoreus sp., Littoraria sp., and Nerita sp. The results also showed that two bacterial isolates (Soil Isolate 10 and Mangrove Isolate 1) had antagonistic activity against S. aureus ATCC 25923, and four isolates (Mangrove-Isolate 1, Soil Isolate 8, Gastropod Isolate 8, and Mangrove Isolate 15) had antagonistic activity against E. coli ATCC 25922. The researchers hypothesize that anthropogenic activities lead to increased rates of antagonistic relationships in the microbiota, but a comparative study is needed to confirm this. The work presented herein offers a preliminary baseline both for monitoring mangrove-associated gastropods along the Iloilo River, and for screening the antagonistic activities of bacteria in this human-perturbed mangrove ecosystem.

How to Cite

Tupas, W. P. ., Estrobo, F. E. C. ., Tabiano, A. M. ., Billonid, J. G. ., Armada, C. D. ., & Mamon, R. A. G. . (2025). Snapshot sample of gastropods and bacterial antagonistic activity in areas of a mangrove ecosystem prone to disturbance from the Iloilo River, Iloilo, Philippines. Asia-Pacific Journal of Science and Technology, 30(02), APST–30. https://doi.org/10.14456/apst.2025.28

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