Abstract
In conjunction with experiments to evaluate water drainage as a control method for the rice water weevil, Lissorhoptrus oryzophilus Kuschel, studies were performed to compare the abundance and species composition of aquatic arthropods in two sets of continuously flooded and temporarily drained but reflooded rice, Oryza sativa L., paddies. A total of 1,736 individuals representing 22 arthropod taxa was collected. Few differences in abundance were detected; however, Notonecta spp. were significantly more abundant in reflooded paddies. Percentage similarity (PS) between paired treatments was >0.50 on all but one date; relatively high PS values on the first sampling dates suggest that the aquatic arthropod community is able to recover rapidly following reflooding. Several taxa appear to possess traits that enhance survival in a rice paddy subjected to temporary drainage. Implications are discussed for the wide-scale use of drainage on California rice acreage.
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