LawesJoubertGriffithsEtAl2007

Référence

Lawes, M.J., Joubert, R., Griffiths, M.E., Boudreau, S. and Chapman, C.A. (2007) The effect of the spatial scale of recruitment on tree diversity in Afromontane forest fragments. Biological Conservation, 139(3-4):447-456. (Scopus )

Résumé

In fragmented landscapes, tree recruitment is critical for forest persistence. We examined the effects of disturbance and environmental factors, isolation distance, and forest area on the spatial scale (grain) of regeneration of tree species in Afromontane forest fragments in South Africa. A species' grain is defined by whether it typically regenerates within its own canopy shadow (fine-grained) or over a larger spatial scale (coarse-grained). Species richness did not differ between small and large forest fragments but there were proportionately more coarse-grained species and fewer fine-grained species in small than in large fragments. While coarse-grained species richness increased with decreasing disturbance and increasing fragment isolation, fine-grained species richness increased with increasing fragment area. Fine-grained species are vulnerable to area-dependent fragmentation pressures. Although they regenerate in their canopy shadow, fine-grained species do not dominate disturbed fragments as expected. While able to survive in small fragments, fine-grained species are potentially dispersal limited and are not good colonisers and depend for their persistence on establishment in large forests. Conversely, because coarse-grained species have effective dispersal mechanisms they can colonise small fragments and are important for the maintenance of tree diversity in fragmented Afromontane forests. Thus, consideration of species grain of regeneration is necessary in conserving Afromontane tree diversity. Fine-grained species are conserved by protecting large forests while coarse-grained species are effectively conserved by maintaining small forest fragments often assumed to be ecologically unviable. © 2007 Elsevier Ltd. All rights reserved.

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@ARTICLE { LawesJoubertGriffithsEtAl2007,
    AUTHOR = { Lawes, M.J. and Joubert, R. and Griffiths, M.E. and Boudreau, S. and Chapman, C.A. },
    TITLE = { The effect of the spatial scale of recruitment on tree diversity in Afromontane forest fragments },
    JOURNAL = { Biological Conservation },
    YEAR = { 2007 },
    VOLUME = { 139 },
    PAGES = { 447--456 },
    NUMBER = { 3-4 },
    __MARKEDENTRY = { [Luc:6] },
    ABSTRACT = { In fragmented landscapes, tree recruitment is critical for forest persistence. We examined the effects of disturbance and environmental factors, isolation distance, and forest area on the spatial scale (grain) of regeneration of tree species in Afromontane forest fragments in South Africa. A species' grain is defined by whether it typically regenerates within its own canopy shadow (fine-grained) or over a larger spatial scale (coarse-grained). Species richness did not differ between small and large forest fragments but there were proportionately more coarse-grained species and fewer fine-grained species in small than in large fragments. While coarse-grained species richness increased with decreasing disturbance and increasing fragment isolation, fine-grained species richness increased with increasing fragment area. Fine-grained species are vulnerable to area-dependent fragmentation pressures. Although they regenerate in their canopy shadow, fine-grained species do not dominate disturbed fragments as expected. While able to survive in small fragments, fine-grained species are potentially dispersal limited and are not good colonisers and depend for their persistence on establishment in large forests. Conversely, because coarse-grained species have effective dispersal mechanisms they can colonise small fragments and are important for the maintenance of tree diversity in fragmented Afromontane forests. Thus, consideration of species grain of regeneration is necessary in conserving Afromontane tree diversity. Fine-grained species are conserved by protecting large forests while coarse-grained species are effectively conserved by maintaining small forest fragments often assumed to be ecologically unviable. © 2007 Elsevier Ltd. All rights reserved. },
    ADDRESS = { McGill School of Environment, Department of Anthropology, McGill University, 855 Sherbrooke Street West, Montreal, Que. H3A 2T7, Canada },
    COMMENT = { Cited By (since 1996):7 Export Date: 14 February 2014 Source: Scopus },
    KEYWORDS = { Area effect, Fragmentation ecology, Grain, Regeneration, Tree community },
    OWNER = { Luc },
    TIMESTAMP = { 2014.02.14 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-34548522706&partnerID=40&md5=1212c82f72406f28e89bb523abea370d },
}

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