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Bioenergetics of the Southern Brook Lamprey, Ichthyomyzon gagei

F. W. H. Beamish and M. Legrow
Journal of Animal Ecology
Vol. 52, No. 2 (Jun., 1983), pp. 575-590
DOI: 10.2307/4573
Stable URL: http://www.jstor.org/stable/4573
Page Count: 16
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Bioenergetics of the Southern Brook Lamprey, Ichthyomyzon gagei
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Abstract

(1) Large fluctuations in proximate composition and energy content of the southern brook lamprey, Ichthyomyzon gagei Hubbs & Trautman, at various stages in the life cycle have been related to the animal's trophic status and reproduction. Protein and lipid were catabolized, the latter to a greater extent, during post-larval development. During the 8 month non-trophic interval which followed the commencement of metamorphosis, lipid and protein were reduced to approximately 7 and 45% of the absolute quantities present in pre-metamorphosing animals. The energy content of the liver and gonad was much greater in females than in males during the later stages of metamorphosis and the adult interval. (2) Metabolic rate, calculated from changes in energy content, increased throughout the post-larval interval. In spawning animals metabolic rate was approximately four times higher than in early metamorphosing lampreys. Metabolic compensation among lampreys from vastly different temperature regimes was suggested, due to a remarkable similarity in lipid accumulation immediately prior to the commencement of metamorphosis.

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