日本産ユスリカ種間の実験室内受精卵採取条件の違いについて

概要

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Conditions of illumination and space required for mating and oviposition were listed for 28 species of chironomids based on laboratory experiments. Among these, eight species involving Cricotopus sylvestris and Propsilocerus akamusi were stenogamous, and fertillized egg masses were easily obtained in a small container (<9 cm in height) without any regular illumination cycles. Fertilized eggs of Chironomus javanus, C. kiiensis, C. okinawanus, Pentapedilum sordens, Polypedilum nubifer and Tanytarsus oyamai were obtained in a little larger container (<30 cm in height) without any illumination cycles. Those of Dicrotendipes enteromorphae and Kiefferulus glauciventris were obtained in the same container as C. javanus under a regular illumination cycle and shading by skylight narrowing. Those of C. circumdatus, C. yoshimatsui, D. lobiger, D. septemmaculatus, Nilodorum tainanus, Parachironomus arcuatus and Polypedilum nubeculosum were obtained in a small cage (134 cm in height) under the same luminous conditions as D. enteromorphae. Those of C. nippodorsalis, C. nipponensis and C. salinarius were obtained in a large cage (182 cm in height) under the same luminous conditions as D. enteromorphae. Those of C. flaviplumus and Polypedilum cultellatum were obtained in a small cage under a regular illumination cycle and shading by putting white acryl plates on the skylight.
2003-03-15