DISPERSAL POTENTIAL OF HERBACEOUS SPECIES ACCORDING TO CLIMATE, LAND USE AND HABITAT CONDITIONS IN WEST AFRICAN SAVANNAH ; POTENCIAL DE DISPERSIÓN DE ESPECIES HERBÁCEAS SEGÚN LAS CONDICIONES DE CLIMA, USO DE LA TIERRA Y HÁBITAT EN LA SABANA DE ÁFRICA OCCIDENTAL ; POTENTIEL DE DISPERSION DES PLANTES HERBACÉES SELON LES CONDITIONS CLIMATIQUES, D’UTILISATION DES TERRES ET D’HABITAT EN SAVANE OUEST-AFRICAINE
According to environmental predictions, West Africa is becoming vulnerable to the adverse effects of climate change and land use dis- turbance. Herbaceous vegetation is the most sensitive to these effects. To assess the poten- tial of species to cope with these changes, this study investigated the dispersal potential of different herbaceous species. Data on her- baceous plant composition and environmen- tal parameters were collected along climate, land use and habitat gradients in West Afri- can savannah areas, as well as the diaspores of all herbaceous species encountered. Their traits were d... Mehr ...
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Dokumenttyp: | Artikel |
Erscheinungsdatum: | 2017 |
Verlag/Hrsg.: |
Cirad
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Schlagwörter: | diaspore traits / dispersal group / disturbance / diversity / Climate change / West Africa / características de las diáspo- ras / tipología de los modos de dispersión / per- turbación / diversidad / cambio climático / África Occidental / caractéristiques des diaspores / typologie des modes de dispersion / pertur- bation / diversité / changement climatique / Afrique de l’Ouest |
Sprache: | Französisch |
Permalink: | https://search.fid-benelux.de/Record/base-28849739 |
Datenquelle: | BASE; Originalkatalog |
Powered By: | BASE |
Link(s) : | https://revues.cirad.fr/index.php/BFT/article/view/ID-BFT-161002 |
According to environmental predictions, West Africa is becoming vulnerable to the adverse effects of climate change and land use dis- turbance. Herbaceous vegetation is the most sensitive to these effects. To assess the poten- tial of species to cope with these changes, this study investigated the dispersal potential of different herbaceous species. Data on her- baceous plant composition and environmen- tal parameters were collected along climate, land use and habitat gradients in West Afri- can savannah areas, as well as the diaspores of all herbaceous species encountered. Their traits were described in order to document the diversity of diaspore categories in herbaceous savannah vegetation. Based on an occurrence diagram, variations in dissemination patterns within families were identified. The dispersal potential of each species was determined on the basis of their patterns of dispersal. A hie- rarchical classification method was used to establish a dispersal typology, and principal component analysis was applied to identify the environmental conditions that account for their patterns of dispersal. The results show that the diaspores of herbaceous spe- cies can be classified according to fruit type, diaspore type, presence of heterodiaspory, exposure of diaspores, number of seeds per diaspore, diaspore morphology, shape of diaspores and pattern of dispersal. Poaceae, the most abundant family in savannah areas, have six patterns of dispersal. Most species have more than one pattern, and species with high dispersal potential (85.43%) dominate the herbaceous vegetation. Four groups of herbaceous species were identified according to their dispersal patterns. Potentially epizoo- chorous and anemochorous species (39.25% of the flora) were more related to village areas independently of climatic conditions and habi- tat types. Potentially endozoochorous and dysozoochorous species (31.06% of the flora) were more related to fresh and dry habitats in protected areas of the North and South Suda- nian zones. Potentially ...