![]() We approximate species’ sensitivity to climate change by their climatic niche breadth, based on species occurrences across South America and bioclimatic variables. We focus on 215 frugivorous bird species along a Neotropical elevational gradient. Here, we test how species’ sensitivity to climate change and trait‐based measures of their ecological adaptive capacity (i) vary along a broad elevational gradient and (ii) covary across a large number of bird species.Ī Neotropical elevational gradient (300–3600 m.a.s.l.) in the Manú Biosphere Reserve, south‐east Peru. However, understanding this relationship is important to predict the potential consequences of a changing climate for species assemblages. To date, it is largely unknown whether and how species’ sensitivity to climate change and their adaptive capacity covary. their dispersal ability and ecological niche). their climatic niche) and aspects of their adaptive capacity (e.g. How species respond to climate change is influenced by their sensitivity to climatic conditions (i.e. We conclude that nutrient limitation and potentially further adverse conditions at higher elevations are strong environmental filters that lead to trait convergence towards a conservative resource use strategy, whereas different trait syndromes are equally successful at lower elevations. These trends were diluted by the coexistence of tree species with a broad range of different root traits within communities particularly towards lower elevations, where root functional diversity was significantly higher. Fine roots at higher elevations and at more nutrient‐poor sites were thicker, had higher tissue densities, and lower specific root length and nutrient concentrations than at lower elevations. We analyzed trait relationships with elevation and soil nutrient availability, and tested whether root functional diversity varied along these gradients. ![]() in tropical montane forests of the Ecuadorian Andes. We measured six fine root traits related to resource acquisition on absorptive fine roots of 288 trees from 145 species along an elevational gradient from 1000 m to 3000 m a.s.l. It is unclear how elevation and related edaphic changes influence the variability in tree fine root traits and belowground functional diversity. ![]() With increasing elevation, trees in tropical montane forests have to invest larger fractions of their resources into their fine roots in order to compensate for increasingly unfavorable soil conditions.
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