Differences in properties in respirational physiology among some chironomid species of the genus Polypedilum

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  • Polypedilum 属ユスリカ数種の呼吸生理学的特性の違い

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Abstract

Five chironomid species of the genus Polypedilum were examined for their larval oxygen consumption rates, survival in anaerobic conditions, and contents and compositions of Hb by laboratory experiments. They showed different respirational properties in accordance with their respective habitat conditions. The mean oxygen consumption rate was the highest for P. masudai, an oligotrophic lake species, and the lowest for P. nubifer, an eutrophic lake species. The mean survival rate of P. asakawaense, another species from oligotrophic waters, was decreased to about 10% within 10hrs after anaerobic exposure whereas that of P. nubifer remained about 15% even 40hrs after exposure. Fifty % survival time was the longest for P. nubifer and the shortest for P. asakawaense. P. masudai had a similar Hb pattern to P. japonicum in PAGE. None of the other 3 species showed a similar pattern to the former two species, and remarkable differences were observed among the 3 species. Some Hb bands were common to two to all species whereas some were specific to a particular species. Hb contents under the rearing condition of 0.4% milk-containing agar were about twice and 1.4 times higher than those under the condition of 0.08% milk for P. asakawaense and for P. nubifer, respectively. Hb content under the condition of 2% milk was lower than those under the conditions of 0.08 and 0.4% milk for P. cultellatum. Some Hb bands appeared with the increase of milk content for all 3 species examined, suggesting their roles in an efficient transportation of oxygen molecules from oxygen-poor environments.

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