Cited by 3,840Physiological and biochemical adaptationsSpecies Distribution and Climate ChangeEcology and Vegetation Dynamics Studies

Impacts of climate warming on terrestrial ectotherms across latitude

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Deutsch, Curtis A., Tewksbury, Joshua J., Huey, Raymond B., Sheldon, Kimberly S., Ghalambor, Cameron K., Haak, David C., Martin, Paul R.·2008·Proceedings of the National Academy of Sciences

Abstract

The impact of anthropogenic climate change on terrestrial organisms is often predicted to increase with latitude, in parallel with the rate of warming. Yet the biological impact of rising temperatures also depends on the physiological sensitivity of organisms to temperature change. We integrate empirical fitness curves describing the thermal tolerance of terrestrial insects from around the world with the projected geographic distribution of climate change for the next century to estimate the direct impact of warming on insect fitness across latitude. The results show that warming in the tropics, although relatively small in magnitude, is likely to have the most deleterious consequences because tropical insects are relatively sensitive to temperature change and are currently living very close to their optimal temperature. In contrast, species at higher latitudes have broader thermal tolerance and are living in climates that are currently cooler than their physiological optima, so that warming may even enhance their fitness. Available thermal tolerance data for several vertebrate taxa exhibit similar patterns, suggesting that these results are general for terrestrial ectotherms. Our analyses imply that, in the absence of ameliorating factors such as migration and adaptation, the greatest extinction risks from global warming may be in the tropics, where biological diversity is also greatest.

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Crossref · 10.1073/pnas.0709472105

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  • Predictions of tropical ectotherm vulnerability have been verified in a variety of tropical reptiles, amphibians, and invertebrates.

    “These predictions have been verified in a variety of tropical reptiles, amphibians, and invertebrates (4–8).”
  • Deutsch et al. predicted that tropical insects should decline by as much as 20% under climate warming.

    “Deutsch et al. (5) predicted that, for insects living at mid-to-high latitudes, rates of increase should grow as climate warms, while in the tropics insects should decline by as much as 20%.”
  • The analyses are in keeping with predictions of Deutsch et al. that tropical insects should be especially vulnerable to climate warming.

    “Fourth, our analyses are in keeping with predictions of Deutsch et al. (5) that tropical insects should be especially vulnerable to climate warming, adding to field and laboratory studies over the past several years that have consistently supported the predicted sensitivity (8, 48–53).”

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Authors
Deutsch, C. A., Tewksbury, J. J., Huey, R. B., Sheldon, K. S., Ghalambor, C. K., Haak, D. C., & Martin, P. R.
Affiliations
  • University of Washington (US)
  • Colorado State University (US)
Venue
Proceedings of the National Academy of Sciences
Published
2008-05-06
Volume
105
Issue
18
Pages
6668-6672
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1992244678
Cited by
3,840
References
40
Citations by year
2026: 249 · 2025: 274 · 2024: 260 · 2023: 284 · 2022: 270 · 2021: 284 · 2020: 320 · 2019: 259 · 2018: 228 · 2017: 203 · 2016: 204 · 2015: 187 · 2014: 168 · 2013: 188 · 2012: 146
FWCI
89.07
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Environmental Science › Ecology › Physiological and biochemical adaptations
  • Physical Sciences › Environmental Science › Ecological Modeling › Species Distribution and Climate Change
  • Physical Sciences › Environmental Science › Nature and Landscape Conservation › Ecology and Vegetation Dynamics Studies
Keywords
global warming, heat tolerance, insect fitness, latitudinal gradient, tropical insects, optimal temperature, climate change projections, extinction risk, climate change impacts
MeSH terms
Adaptation, Physiological, Animals, Insecta, Temperature, Tropical Climate, Greenhouse Effect, Ecosystem

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