Keywords :
Enhydris subtaeniata; Barbonymus gonionotus
บทคัดย่อ :
Enhydris subtaeniata belongs to the Homalopsidae, rear-fanged, aquatic snakes that occur widely throughout much of South Asia. However, E. subtaeniata is restricted to the Korat Basin and surounding Mekong River drainages (Lukoschek et al. 2011. Ecol.Evol. 1:330-342). It inhabits muddy freshwater habitats including agricultural wetlands and primarily preys upon frogs and fish (Karns et al. 2005. Trop. Nat. Hist. 5:73-90). However, the species of prey consumed by E. subtaeniata and its predation behavior remains scarcely documented. Here we document a predation attempt made by E. subtaeniatas on a Barbonymus gonionotus (Silver Barb). At 0137 h on 26 November 2016 (14.3052(degrees)N, 101.5798(degrees)E, WGS 84; 266 m elev.), we observed an adult E. subtaeniatas (total length = 626 cm; 192.6 g) consuming a juvenile B. gonionotus (lateral length = 9.6 cm) on the muddy bank of a shallow flowing stream. The surrounding riparian habitat contained large boulders, bamboo stands, isolated mature evergreen trees, and dense herbaceous vegetation. This riparian corridor forms a tributary of the Mun Drainage within an agricultural portion of the Sakaerat Biosphere Reserve, Thailand. The stream had an ephemeral flow, regulated for agricultural activities and seasonal retention by a large dam, approximately 2 km upstream. The E. subtaeniata had partially swallowed the B. gonionotus by the time of our encounter. The snake remained motionless until capture and subsequently regurgitated its prey. Barbonymus gonionotus are commonly stocked in flooded rice paddies, and serve as a major food source for people in the region. During processing, we identified three large, mid-body boli, which had likely been consumed just prior to the E. subtaeniatas capture.
เอกสารอ้างอิง :
Knierim, T., Barnes C., Strine., Suwanwaree., Farren (2017) Natural history notes. Society for the study of amphibians and reptiles, 48, 407.
