黄蜻稚虫对大鳞副泥鳅仔稚鱼的捕食强度及其捕食选择性

摘要

This study was conducted to determine the predation intensity of Pantala flavescens nymph on Paramisgurnus dabryanus (5, 15, 25, 35 days after hatching, DAH) and the prey selection of the libellula nymph on loach larvae , chironomus larvae, and tubificidae.The results showed that both the instar of libellula nymph and the size of loach were related to the predation intensity of the libellula nymph on Chinese loach .The predation intensity of 9 ~12 instar libellula larvae on P.dabryanus was significantly stronger than that of 5 ~8 instar larvae.P.dabryanus at 25 DAH couldn′t be cap-tured and eaten by libellula larvae less than 5 ~8 instar, and P.dabryanus at 35 DAH couldn′t be captured and eaten by libellula larvae less than 9 ~12 instar.The feeding rates of 5 ~8 instar libellula larvae on 5 and 15 DAH loach showed no significant difference, and the feed rates of 9 ~12 instar libellula larvae on 5, 15, and 25 DAH loach showed no signifi-cant difference.P.flavescens nymph could prey on P.dabryanus, chironomus larvae, and tubificidae, with the preference in the order of chironomus larvae >tubificidae >P.dabryanus.%研究了不同龄期黄蜻（Pantala flavescens）稚虫对4种规格（5、15、25、35日龄）大鳞副泥鳅（Paramisgurnus dabryanus）的捕食强度以及黄蜻稚虫对大鳞副泥鳅、摇蚊幼虫和水蚯蚓的捕食选择性。结果表明，黄蜻稚虫对大鳞副泥鳅的捕食强度与稚虫龄期和大鳞副泥鳅日龄均相关，9～12龄期稚虫对大鳞副泥鳅的捕食强度显著高于5～8龄期稚虫。当大鳞副泥鳅达到25日龄后，5～8龄期稚虫不再捕食；当大鳞副泥鳅达到35日龄后，9～12龄期稚虫不再捕食。5～8龄期稚虫对5、15日龄大鳞副泥鳅的摄食率无显著差异，9～12龄期稚虫对5、15、25日龄大鳞副泥鳅的摄食率也无显著差异。黄蜻稚虫对三种饵料均能捕食，对摇蚊幼虫的选择指数最高，其次是水蚯蚓，对大鳞副泥鳅的选择指数最低。