Temperature fluctuations during development reduce male fitness and may limit adaptive potential in tropical rainforestDrosophila
| Autor: | Jon R. Bridle, Andrew D. Saxon, Eleanor K. O’Brien |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Male
0106 biological sciences 0301 basic medicine Rainforest Climate change Development 010603 evolutionary biology 01 natural sciences Genetic correlation 03 medical and health sciences Quantitative Trait Heritable Animals Body Size Temperature fluctuations Drosophila Ecology Evolution Behavior and Systematics Reproductive success biology Ecology Reproduction Temperature Genetic Variation biology.organism_classification Adaptive potential 030104 developmental biology Ectotherm Male fitness Climate model Genetic Fitness Ecological margins Tropical rainforest |
| Zdroj: | Saxon, A D, O'Brien, E K & Bridle, J R 2018, ' Temperature fluctuations during development reduce male fitness and may limit adaptive potential in tropical rainforest Drosophila ', Journal of Evolutionary Biology, vol. 31, no. 3, pp. 405-415 . https://doi.org/10.1111/jeb.13231 |
| ISSN: | 1010-061X |
| Popis: | Understanding the potential for organisms to tolerate thermal stress through physiological or evolutionary responses is crucial given rapid climate change. Although climate models predict increases in both temperature mean and variance, such tolerances are typically assessed under constant conditions. We tested the effects of temperature variability during development on male fitness in the rainforest fly Drosophila birchii, by simulating thermal variation typical of the warm and cool margins of its elevational distribution, and estimated heritabilities and genetic correlations of fitness traits. Reproductive success was reduced for males reared in warm (mean 24 °C) fluctuating (±3 °C) vs. constant conditions but not in cool fluctuating conditions (mean 17 °C), although fluctuations reduced body size at both temperatures. Male reproductive success under warm fluctuating conditions was similar to that at constant 27 °C, indicating that briefly exceeding critical thermal limits has similar fitness costs to continuously stressful conditions. There was substantial heritable variation in all traits. However, reproductive success traits showed no genetic correlation between treatments reflecting temperature variation at elevational extremes, which may constrain evolutionary responses at these ecological margins. Our data suggest that even small increases in temperature variability will threaten tropical ectotherms living close to their upper thermal limits, both through direct effects on fitness and by limiting their adaptive potential. |
| Databáze: | OpenAIRE |
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