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Specific edge effects in highly endangered Swartland Shale Renosterveld in the Cape Region / Anne Horn in Ecologia mediterranea, fasc. 37, fasc. 2 (Année 2011)

Public [article]  inEcologia mediterranea > fasc. 37, fasc. 2 (Année 2011) . - pp. 63-74 Titre : Specific edge effects in highly endangered Swartland Shale Renosterveld in the Cape Region Titre original : Effets de lisières spécifiques dans les Swartland Shale Renosterveld, formation arbustive en voie de disparition de la région du Cap en Afrique du Sud Type de document : texte imprimé Auteurs : Anne Horn, Auteur ; Cornelia B. Krug, Auteur ; Karen J. Esler, Auteur Année de publication : 2011 Article en page(s) : pp. 63-74 Langues : Anglais (eng) Catégories : [ZG] Afrique du Sud Mots-clés : fragmentation  geophyte  mediterranean-type shrubland  petaloid monocotyledonous plants  reserve size and shape Résumé : "The critically endangered Renosterveld shrubland of the Cape Floristic Region in South Africa is one of the most transformed vegetation types in the world. The most/y small patches that remain after the extensive fragmentation are potentially vulnerable to edge effects and therefore, information on the extent of edge effects in this vegetation type is urgently required for conservation planning. To provide this information, we studied edge effects at two sites in each of five larger fragments of Swartland Shale Renosterveld near Cape Town surveying the vegetation composition along three 10 m wide and 200 m long belt transects. There was little indication of edge effects among the dominant woody species. However, abundance and/or species richness of the petaloid monocotyledonous plants, which contribute a disproportionally high fraction of the vegetation type's high biodiversity, as well as the ferns, had a c/ear negative correlation with edge proximity. For these taxa, effects did not level off at the end of the transect at 200 m. This extent of impact is much larger than those reported in most other studies on edge effects among plants. In contrast, species indicative of high disturbance levels generally decreased within the first 30 m. Consequently, Swartland Shale Renosterveld fragments would be likely to benefit from being enlarged to over 400 m width, while corridors or stepping stones should have a width of over 60 m to minimize major edge effects." (source : auteurs) Type de publication : périodique Référence biblio : Horn A., Krug C., Esler K., 2011 - Specific edge effects in highly endangered Swartland Shale Renosterveld in the Cape Region. Ecologia mediterranea, 37 (2) : 63-74. ID PMB : 57611 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=57611 [article]

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