%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Anthelme, Fabien
%A Carrasquer, I.
%A Ceballos, J. L.
%A Peyre, G.
%T Novel plant communities after glacial retreat in Colombia : (many) losses and (few) gains
%D 2022
%L fdi:010085068
%G ENG
%J Alpine Botany
%@ 1664-2201
%K Biogeographic origins ; Climatic debt ; Growth forms ; Los Nevados national park ; Post-glacial chronosequence ; Tropical alpine
%K COLOMBIE ; ANDES ; ZONE TROPICALE
%K LOS NEVADOS PARC NATIONAL
%M ISI:000794071800001
%P [12 ]
%R 10.1007/s00035-022-00282-1
%U https://www.documentation.ird.fr/hor/fdi:010085068
%> https://www.documentation.ird.fr/intranet/publi/2022-06/010085068.pdf
%V [Early access]
%W Horizon (IRD)
%X Early plant primary succession in recently deglacierized terrains is a good indicator of the species losses and gains that affect novel alpine plant communities migrating under the pressure of climate warming. In the tropical alpine -paramo- region of the northern Andes, home to the world's greatest alpine phyto-diversity, forced primary succession will condition the conservation of many species. Using a post-glacial chronosequence between the little ice age and present below the Conejeras glacier (Colombia) as a space-for-time substitution approach, we sought to determine how time since deglacierization affects the composition, the biogeographic origin and the growth form distribution of novel tropical alpine plant communities. Using an array of multivariate techniques and the Dirichlet model, we assessed relationships among plant communities and with environmental factors. Communities established in less than 169 years lacked a number of characteristic and endemic species usually found in the national park Los Nevados, such as Calamagrostis effusa, Senecio isabelis and Espeletia hartwegiana. Moreover, these communities have been colonized by non-native species, e.g., Rumex acetosella. Upright shrubs and large tussock grasses, characteristic of the alpine tropics, established slowly because they required highly organic, slow-developing soils. Taxa of tropical biogeographic origin were under-represented early after deglacierization in comparison with temperate taxa. These results suggest the existence of a strong climatic debt for some native species, tropical growth forms and taxa of tropical origin, which may translate into significant taxonomic and functional losses whereas the few observed gains concern the establishment of non-native species.
%$ 076 ; 082 ; 021