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Plant species extinction debt in a biodiversity hotspot: community and species approaches
Piqueray, Julien; Bisteau, Emmanuelle; Cristofoli, Sara et al.
2008In Belgian Journal of Botany, 141 (2), p. 189
 

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Abstract :
[en] Destruction and fragmentation of natural and semi-natural habitats are considered as major threats for plant species richness. However, the response of plant species richness to habitat alteration is sometimes delayed. This delay induces an extinction debt in plant communities that are thus prone to undergo species extinctions in the following years. Several methodologies were proposed to detect this extinction debt and estimate the mean number of species yet to disappear. In this study, we developed a new methodology for the estimation of the extinction debt extent. Moreover, we proposed a species approach aimed at determining which species are more sensitive to extinction as a consequence of habitat destruction and fragmentation. Finally, we explored the colonization ability of habitat specialist species. This aspect is of fi rst importance to counteract local species extinctions. Our model habitat is calcareous grasslands of Southeast Belgium that have suffered an important fragmentation process since the beginning of the twentieth century. We estimated that the mean extinction debt of the calcareous grassland patches was ca. 24 species, including ca. six specialist species. We showed that 16 of the 46 specialist species did not meet their area requirement anymore and were therefore considered as sensitive to extinction. However, the species composition of the more recent grasslands indicates a non-negligible recolonization potential of specialist species. There is thus a real possibility to reduce extinction risk by restoring suitable habitats.
Disciplines :
Environmental sciences & ecology
Author, co-author :
Piqueray, Julien ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Bisteau, Emmanuelle ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Cristofoli, Sara ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Palm, Rodolphe ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Mahy, Grégory ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Language :
English
Title :
Plant species extinction debt in a biodiversity hotspot: community and species approaches
Publication date :
2008
Event name :
Young Botanists Day 2007
Event organizer :
Royal Botanical Society of Belgium
Event place :
Bailleul, France
Event date :
23 November 2007
Audience :
International
Journal title :
Belgian Journal of Botany
ISSN :
0778-4031
eISSN :
1781-8656
Publisher :
Société Royale de Botanique de Belgique, Belgium
Volume :
141
Issue :
2
Pages :
189
Available on ORBi :
since 07 September 2009

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