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Changing assembly processes during a primary succession of plant communities on Mediterranean roadcuts

Journal of Plant Ecology 2013年第1期6卷 19-28页

作者： Valerie Raevel Francxois Munoz virginie pons Alain Renaux Arnaud Martin John D.Thompson Universite Montpellier 2 and CNRS Centre d’Ecologie Fonctionnelle et EvolutiveUMR 51751919 route de Mende34293 Montpellier Cedex 5France Universite´Montpellier 2 botAnique et bioinforMatique de l’Architecture des PlantesTA A-51/PS234398 Montpellier Cedex 5France

Aims Studying plant ecological succession provides insights into the spatiotemporal processes underlying community assembly and is of primary importance for restoration *** investigate here colonization events and local community assembly over an original primary succession occurring on roadcuts after *** this,we addressed both the changes in species presence–absence(incidence data)to highlight pre-establishment filters and in species relative abundances to further assess the influence of local biotic *** We studied 43 limestone roadcuts in Mediterranean France,covering five age classes up to an age of 80 years,along with 13 natural cliffs as a reference,and we counted 14322 plant individuals on these *** applied a constrained nonsymmetric correspondence analysis of both the incidence(presence–absence)and abundance data to assess the variation of these data along the *** Findings Along the first 30 years,the initially abundant short-lived species declined both in terms of incidence and abundance and were replaced by longer lived herbaceous and woody *** first phase was characterized by species that are widespread in the surrounding scrublands and was comparable to an early secondary succession *** 30 years,there were continuing changes in incidence data with age,but no more significant change in species’*** second phase was marked by the late colonization of specialists that did not become *** colonization and establishment limitation was thereby apparent for specialist species,a slow convergence of community composition toward the situation of natural cliffs could be detected in the older stages of the *** findings convey insights into the natural dynamics of man-made outcrop plant communities and may be useful for the ecological management and restoration of such *** also illustrates the interest of comparing incidence and abundance data to i

关键词： primary succession roadcut colonization dynamics assembly rules Mediterranean environment non-symmetric correspondence analysis

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

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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 *** 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 *** 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 *** 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 *** also quantified variation in the behaviour of pollinators in population patches of contrasting spatial *** 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 *** the landscape scale,isoplethy of local population patches is more correlated with decreased isolation among patches than with patch ***,within local isoplethic populations,small patches can show significantly biased morph *** small isolated patches,pollinators perform shorter flight distances among consecutive flower visits than in spatially extensive *** 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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