Riparian forests of Southwest Europe: are functional trait and species composition assemblages constrained by environment?

Journal of Vegetation Science - Tập 24 Số 4 - Trang 628-638 - 2013
Francisca C. Aguiar1, J. Orestes Cerdeira2,1, Maria João Martins1, María Teresa Ferreira1
1Instituto Superior de Agronomia, Universidade Técnica de Lisboa Centro de Estudos Florestais Tapada da Ajuda 1349‐017 Lisboa Portugal
2Departamento de Matemática, Universidade Nova de Lisboa Faculdade de Ciências e Tecnologia Quinta da Torre 2829‐516 Caparica Portugal

Tóm tắt

AbstractQuestionsWhat are the species and functional trait composition of riparian forests in near‐natural Southwest European rivers? Are functional trait and species assemblages constrained by environment?LocationNear‐natural riparian habitats throughout mainland Portugal, Southwest Europe.MethodsWe collected data on riparian woody abundances and environmental variables from 175 river locations. Twenty‐eight key functional traits were assigned to the surveyed species. Hierarchical clustering and indicator species analysis were used to derive compositional and functional groups of sites. We used Mantel tests to relate species and trait abundances and environmental gradients, and identified sets of relevant variables at diverse spatial scales. Then, four Dispersion indicators were developed to assess the extent to which the groups are constrained by the environment. These measures were tested for significance using iteration procedures.ResultsClustering revealed four compositional groups of sites: Alder woods, Ash woods, Tree–heath shrublands and Semi‐arid shrublands; and three functional groups: Mixed riparian forests, Shrublands with fleshy fruits and Stress‐tolerant shrublands. These groups were primarily defined by broad‐scale gradients of climate, elevation and river hierarchy. The most dispersed groups had broad trait composition (e.g. Mixed riparian forests) and were floristically diverse (Alder woods). In general, the compositional groups were more closely related to environmental gradients than the functional groups.ConclusionsAssemblages with very specific functional traits or with homogeneous species composition were largely constrained to the most extreme environmental conditions in the study area. Future research to assist environmental management should be directed to the role of fine‐scale environmental determinants of riparian assemblages, especially those related to flow variability and water stress.

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Thông tin xuất bản

Journal of Vegetation Science

Tập 24 Số 4

628-638

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