Abstract
It has long been believed thatDrosophila larvae feed almost entirely by ingesting yeast and possibly other microorganisms that are associated with fermenting fruits or other vegetable matter. However, we have discovered that the larvae of a number ofDrosophila species can consume such diverse substrates as insect tissues, including the exoskeleton. Experiments reported here, which include raising sterile dechorionated eggs to adulthood on adult carcasses under axenic conditions, show that larvae can consume complex chitinous substrates directly without the assistance of microorganisms. We show thatDrosophila larvae are able externally to digest amylose, cellulose, and chitin, without coming into physical contact with them. We conclude that not only doDrosophila larvae produce enzymes enabling them to digest a wide variety of substrates, but also these enzymes are egested onto the substrates so that at least some digestion, especially of large polymers, takes place externally. Finally, we suggest that the phenomenon of external digestion explains both the previously unexplained massiveness ofDrosophila salivary glands and their chromosomes and the tendency of larvae to cluster, which may also be true of other dipterans.
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Ashburner, M. (1981). Entomophagous and other bizarre Drosophilidae. In Ashburner, M., and Wright, T. (eds.),The Genetics and Biology of Drosophila Academic Press, New York, Vol. 3a, pp. 325–421.
Ashburner, M., and Berendes, H. D. (1978). Puffing of polytene chromosomes. In Ashburner, M., and Wright, T. (eds.),The Genetics and Biology of Drosophila Academic Press, New York, Vol. 2b, pp. 316–397.
Ashburner, M.,et al. (eds.) (1976).The Genetics and Biology of Drosophila Academic Press, New York, Vols. 1a-3e.
Begon, M. (1982). Yeasts and Drosophila. In Ashburner, M., Carson, H. L., and Thompson, J. N. (eds.),The Genetics and Biology of Drosophila Academic Press, New York, Vol. 3b, pp. 345–385.
Berendes, H. D., and Ashburner, M. (1978). The salivary glands. In Ashburner, M., and Wright, T. (eds.),The Genetics and Biology of Drosophila Academic Press, New York, Vol. 2b, pp. 453–499.
Bernfeld, P. (1955). Amylases alpha and beta. In Colowick, S. P., (ed.),Methods in Enzymology Academic Press, New York, Vol. 1, pp. 149–155.
Krafft, K. (1971). Contribution a la biologie et la l'ethologie de'Agelena consociata Denis (araignee sociale du Gabon). III. Etude de experimentale de certains phenomenes sociaux.Biol. Gabon. 71.
Lachaise, J., and Tsacas, L. (1985). Breeding sites in the tropical African Drosophilids. In Ashburner, M., Carson, H. L., and Thompson, J. N. (eds.),The Genetics and Biology of Drosophila Academic Press, New York, 1985, Vol. 3d, pp. 221–333.
Martin, M. M., Kurkor, J. J., Martin, J. S., Lawson, D. L., and Merritt, R. W. (1981). Digestive enzymes of larvae of three species of caddisflies (Trichoptera).Insect Biochem. 11501.
Martin, M. M., Kurkor, J. J., and Martin, J. S. (1985). The digestive enzymes of larvae of the black fly,Prosimulium fuscum.Comp. Biochem. Physiol. 82B37.
O'Brian, S. J., and MacIntyre, R. J. (1978). Biochemistry and specific proteins of Drosophila. In Ashburner, M., and Wright, T. (eds.),The Genetics and Biology of Drosophila Academic Press, New York, Vol. 2a, pp. 396–553.
Rypstra, A. L., and Gregg, T. G. (1986). Facultative carnivory inDrosophila hydei. Dros. Inf. Ser. 63116.
Vonk, H. J., and Western, J. R. H. (1984).Comparative Biochemistry and Physiology of Digestion Academic Press, New York.
Wigglesworth, V. B. (1972).The Principles of Insect Physiology 7th ed., Chapman and Hall, London.
Winicur, S., and Mitchell, H. K. (1974). Chitinase activity during Drosophila development.J. Insect Physiol. 201795.
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This investigation was supported by NIH (AREA) Grant IR 15AG05897.
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Gregg, T.G., McCrate, A., Reveal, G. et al. Insectivory and social digestion inDrosophila . Biochem Genet 28, 197–207 (1990). https://doi.org/10.1007/BF00561337
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DOI: https://doi.org/10.1007/BF00561337