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Population fluctuation and dispersion patterns of apple snails, Pomacea spp. (Gastropoda: Ampullariidae) in a rice ecosystem


Gilal, Arfan Ahmed and Muhamad Awang, Rita and Omar, Dzolkhifli and Abd Aziz, Nor Azwady and Gnanasegaram, Manjeri (2016) Population fluctuation and dispersion patterns of apple snails, Pomacea spp. (Gastropoda: Ampullariidae) in a rice ecosystem. Pertanika Journal of Tropical Agricultural Science, 39 (3). pp. 343-357. ISSN 1511-3701; ESSN: 2231-8542


A field study was conducted for two consecutive rice-growing seasons from August, 2013 to May, 2014 to understand the population dynamics of exotic apple snails, Pomacea spp. (Ampullariidae), as affected by ambient weather and aquatic weeds. A one-acre rice field was divided into four blocks and eight samples per block were taken using a 0.5x0.5m quadrat. Collected snails were recorded as numbers of egg clutches, juveniles, adult females and males. Average rainfall, relative humidity, temperature and water pH, along with number of aquatic weeds and seedlings, were also recorded. Results confirmed the presence of only Pomacea maculata. The numbers of egg clutches, juveniles and adults were relatively high during the off-season as compared to the main-season. Meanwhile, relative humidity had a significant effect on the number of egg clutches, and rainfall affected the densities of juveniles and adults. Among the weeds, Limnocharis flava (Alismataceae) had significant effect on the densities of different snail stages. Different stages showed uniform dispersion pattern during both seasons due presumably to continuous availability of water and abundant food. Thus, results obtained could be helpful in understanding the population dynamics of P. maculata and devising appropriate management strategy.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Agriculture
Faculty of Science
Publisher: Universiti Putra Malaysia Press
Keywords: Apple snail; Rice; Weeds; Population fluctuation; Dispersion; Weather; Pomacea
Depositing User: Nabilah Mustapa
Date Deposited: 30 Dec 2016 03:54
Last Modified: 30 Dec 2016 03:54
URI: http://psasir.upm.edu.my/id/eprint/49688
Statistic Details: View Download Statistic

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