Citizen science in mountain environments
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The first phenological stage that is observed at the end of winter for the hazel tree – namely its flowering – has advanced by roughly 10 days in a period of 10 years. Certain years, this stage has been observed beginning around late December. We would say that the flowering of the hazel tree exhibits a more noticeable premature trend than the other species and the other stages.

Floraison de chatons de noisetier - © CREA Mont-Blanc

Based on this observation, we can put forth the hypothesis that the impact of the temperature increase would be more noticeable among species, like the hazel tree, that already sprout or flower naturally earlier in the year, in contrast with species like the spruce that sprout or flower much later in the season.

Why do species react differently to the same climate variations?

It is therefore important to study a panel of premature and late species to understand if the temperature increase impacts them all in the same way. The species studied in the Phenoclim programme are thus carefully chosen for their distinctive features and their complementarities, representative of various rhythms of development of living beings over the seasons.

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