Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/143692
Title: INVESTIGATING THE ENVIRONMENTAL PARAMETERS OF BITHYNIA SNAILS, THE INTERMEDIATE HOST FOR OPISTHORCHIS VIVERRINI, IN RAIN-FED AND IRRIGATED AREAS IN NORTHEAST THAILAND
Authors: Lee Kai Ling Kaylene
Keywords: Opisthorchis viverrini, Bithynia siamensis goniomphalos, irrigation, rain-fed, abiotic environmental parameters, biotic species interactions
Issue Date: 2015
Citation: Lee Kai Ling Kaylene (2015). INVESTIGATING THE ENVIRONMENTAL PARAMETERS OF BITHYNIA SNAILS, THE INTERMEDIATE HOST FOR OPISTHORCHIS VIVERRINI, IN RAIN-FED AND IRRIGATED AREAS IN NORTHEAST THAILAND. ScholarBank@NUS Repository.
Abstract: Northeast Thailand, Isaan, has one of the highest Opisthorchis viverrini prevalence rates in the world prompting epidemiology and landscape ecological studies in that region. The freshwater snail, specifically the Bithynia siamensis goniomphalos, has been identified to be an intermediate host for O. viverrini. Due to the unreliable rainfall in Isaan, the Thai government has been introducing irrigation schemes to increase agricultural yield and reduce poverty. However, with the construction of more irrigation infrastructure, this can potentially increase Bithynia s. goniomphalos snails, thereby increasing the prevalence of O. viverrini. Current landscape ecological studies concerning Bithynia s. goniomphalos are limited to water quality and soil properties. Furthermore, research comparing rain-fed and irrigated areas in Isaan is rudimentary. This study aimed to investigate the environmental parameters of Bithynia siamensis goniomphalos and its population dynamics in rain-fed and irrigated areas in Isaan. Variations in water quality, soil properties, water depth and macrophyte characteristics were examined across five provinces in Isaan in June and September 2014. Statistical analyses revealed that exchangeable calcium and water depth were statistically significantly related to the abundance of Bithynia s. goniomphalos and diversity of snails respectively. Negative correlation was found between Bithynia s. goniomphalos and Filopaludina (S.) martensi martensi, suggesting interspecies competition. The comparison between irrigated and rain-fed areas revealed that population dynamics between rain-fed and irrigated areas differed with larger number of Bithynia s. goniomphalos found in irrigated areas and irrigation structures. This study highlights that the understanding of the complex interplay of abiotic environmental variables and biotic interaction is essential when determining the landscape ecology of Bithynia s. goniomphalos. Furthermore, this study emphasises the importance of considering ecological impact concerning O. viverrini and Bithynia s. goniomphalos before the construction irrigation networks.
URI: http://scholarbank.nus.edu.sg/handle/10635/143692
Appears in Collections:Bachelor's Theses (Restricted)

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