Idea paper: Effects of gonad type and body mass on the time required for sex change in fishes

Soma Tokunaga; Tatsuru Kadota; Yuuki Y. WatanabeTetsuo KuwamuraYuuki Kawabata

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Idea paper: Effects of gonad type and body mass on the time required for sex change in fishes

机译：Idea paper: Effects of gonad type and body mass on the time required for sex change in fishes

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Sex change is a well-known phenomenon in teleost fishes, and it takes several days to a few months depending on the species and direction of sex change. However, the underlying factors influencing the time required for sex change (T_S) remain unclear. Given that the time for producing a new gonad largely determines T_S, the gonad type (i.e., whether fish retain the gonad of opposite sex or not [delimited or non-delimited]) and metabolic rate may affect T_S. This study sought to test two hypotheses: (1) the delimited gonad shortens T_S and (2) T_S scales with mass~(0.1-0.2), because the metabolic scaling exponent (β) in fishes is 0.8-0.9 and biological times scale with mass~(1-β) in general. We compiled data on T_S for 12 female-to-male and 14 male-to-female sex-changing species from the literature. Results of individual examinations of the effects of gonad type and mass were consistent with our hypotheses. However, upon simultaneous examination of the effects of gonad type and mass, these effects became unclear because of their strong multicollinearity. The compiled data for delimited and non-delimited gonads were biased toward the smaller and larger species, respectively, precluding us from being able to statistically distinguish between these effects. Small species with non-delimited gonads and large species with delimited gonads exist; however, their T_S has not been measured with high temporal resolution thus far. Therefore, additional experiments on these species are required to statistically distinguish between, as well as to better understand, the effects of gonad type and mass on T_S.

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《Ecological research》 |2022年第4期|490-494|共5页
作者
Soma Tokunaga; Tatsuru Kadota; Yuuki Y. WatanabeTetsuo KuwamuraYuuki Kawabata;
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作者单位

Faculty of Fisheries, Nagasaki University, Nagasaki, Japan, Department of Polar Science, SOKENDAI (The Graduate University for Advanced Studies), Tokyo, Japan;

Nagasaki Field Station, Fisheries Technology Institute, Japan Fisheries Research and Education Agency, Nagasaki, Japan;

Department of Polar Science, SOKENDAI (The Graduate University for Advanced Studies), Tokyo, Japan, National Institute of Polar Research, Tokyo, JapanSchool of International Liberal Studies, Chukyo University, Nagoya, Japan, Institute for Research in Social Science, Advanced Collaborative Research Organization of Chukyo University, Nagoya, JapanGraduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki, Japan;

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experiment; ideas for fundamental questions; individual; scaling; sequential hermaphrodites;

Idea paper: Effects of gonad type and body mass on the time required for sex change in fishes

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