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Climate variability predicts thermal limits of aquatic insects across elevation and latitude [Functional Ecology]

Keywords : thermal breadth, CTMIN, CTMAX, Janzen’s hypothesis, aquatic insects, vulnerability, climate change

par Frédéric Magné - publié le

1. Janzen’s extension of the climate variability hypothesis posits that increased seasonal variation at high latitudes should result in greater temperature overlap across elevations, and favor wider thermal breadths in temperate organisms compared to their tropical counterparts.
2. We tested these predictions by measuring stream temperatures and thermal breadths (i.e. the difference between the critical thermal maximum and minimum) of 62 aquatic insect species from temperate (Colorado, USA) and tropical (Papallacta, Ecuador) streams spanning an elevation gradient of ca. 2000m.(...)

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