Effects of global warming on sex ratios in fishes.

Journal of Fish Biology
Benjamin Geffroy, Claus Wedekind

Abstract

In fishes, sex is determined by genetics, the environment or an interaction of both. Temperature is among the most important environmental factors that can affect sex determination. As a consequence, changes in temperature at critical developmental stages can induce biases in primary sex ratios in some species. However, early sex ratios can also be biased by sex-specific tolerances to environmental stresses that may, in some cases, be amplified by changes in water temperature. Sex-specific reactions to environmental stress have been observed at early larval stages before gonad formation starts. It is therefore necessary to distinguish between temperature effects on sex determination, generally acting through the stress axis or epigenetic mechanisms, and temperature effects on sex-specific mortality. Both are likely to affect sex ratios and hence population dynamics. Moreover, in cases where temperature effects on sex determination lead to genotype-phenotype mismatches, long-term effects on population dynamics are possible, for example temperature-induced masculinization potentially leading to the loss of Y chromosomes or feminization to male-biased operational sex ratios in future generations. To date, most studies under contro...Continue Reading

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Citations

Jun 22, 2020·Journal of Fish Biology·Maud AlixKelli C Anderson
Oct 29, 2020·Journal of Fish Biology·Sébastien AlfonsoBastien Sadoul
Mar 20, 2021·Global Change Biology·Kenneth A EricksonStephen R Midway
Apr 22, 2021·Journal of Fish Biology·Natalie Villar Freret-MeurerGabriela Dos Santos Cabiró
Jul 28, 2021·Journal of Fish Biology·David J McKenzieAnthony P Farrell
Jul 28, 2021·Journal of Fish Biology

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