Effects of food availability and age on the reproductive effort of the apple snail, Pomacea canaliculata (Gastropoda: Ampullariidae)
2002
Estoy, G.F. Jr (Philippine Rice Research Inst., Munoz, Nueva Ecija (Philippines). Crop Protection Div.) Yusa, Y. | Wada, T. | Sakurai, H. | Tsuchida, K.
The effects of food availability and age on the reproductive traits of Pomacea canaliculata were determined in snails fed at three food levels under laboratory conditions (14L:10D; 25C). In males, copulation frequency tended to increase with age, while food availability did not affect copulation frequency, In females, spawn production was lower in food-limited conditions, but current or weight-specific reproductive effort (RE) did not differ among food levels. The weight-specific RE and spawn frequency of the well-specific RE and sprawn frequency of the well-fed females decreased with age, but their current RE increased with age. Plasticity in the life history, which accompanies changes in RE, also aids this snail to adopt to various environments
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