Abundance, habitat preference, and ethnobiological assessment of the invasive Golden Apple Snail Pomacea canaliculata (Lamarck, 1822) in selected rice fields in Lanao del Sur, Philippines
DOI:
https://doi.org/10.11609/jott.9923.18.7.29287-29301Keywords:
Cultural intersection, density, farmer perceptions, integrated pest management, invasive alien species, Lincoln–Petersen estimator, mark–recapture, microhabitat, oviposition, physicochemical factorsAbstract
This study assessed the abundance, habitat preference, and ethnobiological impacts of the Golden Apple Snail (GAS) Pomacea canaliculata in selected rice fields in Lanao del Sur, Philippines. Employing the Lincoln-Petersen estimator, the population was estimated at 184 individuals during the initial sampling and increased to approximately 920 in the subsequent period, reflecting a significant rise over time. The combined density of adults and juveniles ranged 0.75–0.96 individuals per m2 in the first period, and 2.00–3.39 individuals per m2 in the second. Adult snails were mostly associated with water and sediment, while juveniles concentrated primarily in sediment. Egg clutch density was higher in the first sampling period (0.30 clutches) compared to the second (0.12 clutches), with leaf sheaths identified as the preferred oviposition site. Water temperature ranged 22.7–27.0 °C, pH 6.83–7.23, relative humidity 83.5–89.2 %, and water depth 4.5–13 cm, indicating that warmer, deeper, and more humid conditions promoted increased activity and abundance. Ethnobiological data revealed that farmers regard GAS as a serious pest that reduces rice yields, threatens livelihoods, and poses health risks, including injuries, pesticide irritation, and schistosomiasis. While traditional methods and synthetic pesticides are used, farmers find these approaches costly, labor-intensive, and only partially effective. Overall, findings highlight that P. canaliculata is an abundant, adaptable invasive species threatening rice agriculture, livelihoods, and public health. This underscores the urgent need for integrated, sustainable, and community-based management strategies.
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