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Variation of a floral polymorphism at different spatial scales in the Mediterranean geophyte Narcissus assoanus

Journal of Plant Ecology 2016年第3期9卷 333-345页

作者： Regina Berjano Perrine Gauthier Chiara Parisi Valentine Vaudey Virginie Pons Alain Renaux David Doblas John D.Thompson UMR 5175 Centre d’Ecologie Fonctionnelle et Evolutive CNRS1919 route de Mende34293 Montpellier cedex 5France Departamento de Biología Vegetal y Ecología University of SevilleApdo 1095.41080 SevilleSpain

Aims Habitat fragmentation impacts the spatial extent and isolation of local populations and communities.Although the biological consequences of these impacts have been well studied at the site level,effects directly related to changes in the spatial configuration of populations in the landscape remain less clear.The objective of this study is to examine how changes in the spatial-scale configuration of populations are associated with variability in morph rations in the floral polymorphic Mediterranean geophyte Narcissus assoanus.Methods We performed a nested analysis of morph ratio variation at three spatial scales:a 50×50 km regional scale in SE France,in fourteen 1×1 km landscapes located in the same region,and within 12 spatially extensive population patches.We also quantified variation in the behaviour of pollinators in population patches of contrasting spatial configuration.Important FindingsAt a regional scale,morph ratios show a geographic pattern of increasing isoplethy(1:1 morph ratio)away from centres of human population development and in upland pastures.At the landscape scale,isoplethy of local population patches is more correlated with decreased isolation among patches than with patch size.Finally,within local isoplethic populations,small patches can show significantly biased morph ratios.In small isolated patches,pollinators perform shorter flight distances among consecutive flower visits than in spatially extensive patches.This study of variation in a genetic polymorphism at multiple spatial scales provides new insights into the scale-dependent effects of habitat fragmentation and the potential occurrence of metapopulation dynamics in natural plant populations.

关键词： flower polymorphism habitat fragmentation Mediterranean Narcissus stigma-height polymorphism

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