Positive genetic covariance and limited thermal tolerance constrain tropical insect responses to global warming

Carlos García-Robledo & Christina Baer
Tropical ectotherms are particularly vulnerable to global warming because their physiologies are assumed to be adapted to narrow temperature ranges. This study explores three mechanisms potentially constraining thermal adaptation to global warming in tropical insects: 1. tradeoffs in genotypic performance at different temperatures (the jack-of-all-trades hypothesis) 2. positive genetic covariance in performance, with some genotypes performing better than others at viable temperatures (the ‘winner and ‘loser genotypes hypothesis) or 3. limited genetic variation as the...
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