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Rice is commonly cultivated under irrigated conditions, servingas artificial wetlands for many plant and animal species(FAO, 2004a; Fasola and Ruiz, 1996). As in other complex andmultifunctional wetlands, the hydrological regime plays a keyrole in the ecology of these agroecosystems (Bambaradeniyaand Amarasinghe, 2003). The source and frequency of irrigationdirectly affects the ecology and biodiversity of rice cultivations.The source of water determines both the physiochemical characteristicsand the composition of aquatic biota. The duration,regularity and predictability of rice field flooding have effects onthe temporal variation of the water depth (volume) and chemistry,
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