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Synthesis toward a global model of metabolism and chemical composition of medusae and ctenophores

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Title: Synthesis toward a global model of metabolism and chemical composition of medusae and ctenophores
Authors: Ikeda, Tsutomu Browse this author →KAKEN DB
Keywords: ammonia excretion
CN composition
O:N ratio
Issue Date: Jul-2014
Publisher: Elsevier
Journal Title: Journal of Experimental Marine Biology and Ecology
Volume: 456
Start Page: 50
End Page: 64
Publisher DOI: 10.1016/j.jembe.2014.03.006
Abstract: Respiration and ammonia excretion data and chemical composition data [water content, ash, carbon (C), nitrogen (N) and C:N ratios] of a total of 28–72 species of hydromedusae, scyphomedusae, siphonophores and ctenophores from various depths of the world's oceans were compiled. Multiple regression analyses revealed that body mass and habitat temperature but habitat depth were significant predictors for respiration and ammonia excretion rates. The scale exponents of body mass (0.66–1.05) and temperature coefficients (1.7–3.1 as Q10) of the empirical regression models varied greatly by the choice of body mass units (DM, C or N). The O:N ratios (median: 15.0) were independent of these parameters. Body C and N compositions (% of DM) decreased with the increase in either DM or habitat temperature, showing a stable C:N ratio of 3.8 (by mass). Comparison of the present results with global-bathymetric features of chaetognaths, copepods, euphausiids and mysids revealed that the medusae and ctenophores are unique in that they maintain high metabolic rates per unit body N, lack significant effects of habitat depth on metabolic rates, have high specific growth rates, and have little accumulation of energy reserves (lipids) in the body.
Type: article (author version)
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 池田 勉

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