Effects of global warming on sex ratios in fishes.

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State: Public
Version: Author's accepted manuscript
License: Not specified
Serval ID
serval:BIB_4539A24B895B
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Effects of global warming on sex ratios in fishes.
Journal
Journal of fish biology
Author(s)
Geffroy Benjamin, Wedekind Claus
ISSN
1095-8649 (Electronic)
ISSN-L
0022-1112
Publication state
Published
Issued date
10/06/2020
Peer-reviewed
Oui
Language
english
Notes
Publication types: Journal Article ; Review
Publication Status: aheadofprint
Abstract
In fishes, sex is either 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 controlled conditions conclude that if temperature affects sex ratios, elevated temperatures mostly lead to a male bias. The few studies that have been performed on wild populations seem to confirm this general trend. Recent findings suggest that transgenerational plasticity could potentially mitigate the effects of warming on sex ratios in some populations.
Keywords
Climate change, cortisol, environmental sex reversal, methylation, sex determination, sex-specific mortality
Pubmed
Open Access
Yes
Create date
10/06/2020 16:57
Last modification date
26/06/2020 5:21
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