Rapid adjustment of bird community compositions to local climatic variations and its functional consequences

摘要: The local spatial congruence between climate changes and community has rarely been studied over large areas. We proposed one of the first comprehensive frameworks tracking in composition related to changes. First, we investigated whether how 12 years bird communities were variations. Then, tested consequences this climate-induced adjustment on Grinnellian (habitat-related) Eltonian (function-related) homogenization. A standardized protocol monitoring temporal trends birds France from 2001 2012 was used. For each plot year, used spring temperature precipitations calculated three indices reflecting thermal niche, habitat specialization, functional originality species within a community. then moving-window approach estimate distribution these their congruency with climatic Temperature fluctuations dynamics found be highly variable space, but variations finely congruent. More interestingly, nonmonotonous. Instead, unexplained observed up certain threshold change intensity, above which observed. This shift corresponded significant decrease relative abundance specialists functionally original communities, regardless direction change. investigation responses appears central step toward better understanding effects biodiversity. Our results suggest fine-scale short-term Moreover, seem responsible for both aspects