4.8 Article

Climate predicts both visible and near-infrared reflectance in butterflies

期刊

ECOLOGY LETTERS
卷 24, 期 9, 页码 1869-1879

出版社

WILEY
DOI: 10.1111/ele.13821

关键词

Bogert's rule; ecogeographical patterns; Gloger's rule; thermal melanism; thermoregulation

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资金

  1. National Research Foundation of Korea [NRF-2019R1C1C1002466]
  2. Korea Polar Research Institute [PE21060]
  3. Australian Research Council [FT180100216]
  4. Korea Polar Research Institute of Marine Research Placement (KOPRI) [PE21060] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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The research found that the reflectance of European butterflies is correlated with climatic factors, particularly in terms of thermal adaptation, with more prominent variations in the near-infrared wavebands. The thermal environment also influences the difference in reflectance between the dorsal and ventral surfaces of butterflies, potentially due to the modulation between heating and cooling requirements.
Climatic gradients frequently predict large-scale ecogeographical patterns in animal coloration, but the underlying causes are often difficult to disentangle. We examined ecogeographical patterns of reflectance among 343 European butterfly species and isolated the role of selection for thermal benefits by comparing animal-visible and near-infrared (NIR) wavebands. NIR light accounts for similar to 50% of solar energy but cannot be seen by animals so functions primarily in thermal control. We found that reflectance of both dorsal and ventral surfaces shows thermally adaptive correlations with climatic factors including temperature and precipitation. This adaptive variation was more prominent in NIR than animal-visible wavebands and for body regions (thorax-abdomen and basal wings) that are most important for thermoregulation. Thermal environments also predicted the reflectance difference between dorsal and ventral surfaces, which may be due to modulation between requirements for heating and cooling. These results highlight the importance of climatic gradients in shaping the reflectance properties of butterflies at a continent-wide scale.

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