Niche differentiation and distribution of Carex curvula along a bioclimatic gradient in the southwestern Alps
International audience Carex curvula is a dominant sedge of European alpine tundra, exhibiting two morphological forms: C. curvula ssp. curvula (Ccc) and C. curvula ssp. rosae (Ccr). In this paper, we attempt to explore whether Ccc and Ccr are ecotypes or vicariant forms and whether between- and wit...
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fttriple:oai:gotriple.eu:10670/1.4b3bf2 2023-05-15T18:40:18+02:00 Niche differentiation and distribution of Carex curvula along a bioclimatic gradient in the southwestern Alps Choler, P. Michalet, R. Laboratoire d'Ecologie Alpine (LECA) Université Joseph Fourier - Grenoble 1 (UJF)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) 2002-01-01 https://hal.archives-ouvertes.fr/halsde-00295034 en eng HAL CCSD Wiley halsde-00295034 10670/1.4b3bf2 https://hal.archives-ouvertes.fr/halsde-00295034 undefined Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 1100-9233 Journal of Vegetation Science Journal of Vegetation Science, Wiley, 2002, 13 (6), pp.851-858 alpine tundra ecotype niche theory ordination Outlying Mean Index Plant-communities alpine vegetation europe geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2002 fttriple 2023-01-22T17:28:08Z International audience Carex curvula is a dominant sedge of European alpine tundra, exhibiting two morphological forms: C. curvula ssp. curvula (Ccc) and C. curvula ssp. rosae (Ccr). In this paper, we attempt to explore whether Ccc and Ccr are ecotypes or vicariant forms and whether between- and within-regional distribution patterns can be explained by variations in the amount of available habitats and/or by changes in niche attributes. The study area covered three bioclimatically distinct regions of the southwestern Alps in which local abundances of Ccc and Ccr strongly differ. The realized niche of both forms was investigated by a direct gradient analysis performed on an extensive floristic and environmental data set. We found no evidence of niche overlap between Ccc and Ccr as their distribution curves differ strongly along disturbance, mesotopography and soil acidity gradients. We investigated the effect of region on the structure of local scale variables tables. Highly concordant patterns among regions were found, except that optimal habitat conditions for Ccc were infrequent in the southernmost regions. We compared the ecological behaviour of range centre and range margin populations of each form. We found a narrower ecological amplitude for Ccr in the northern part of its range, whereas for Ccc the niche breadth of range-margin populations was not reduced compared to range centre populations. At its southern range limit, Ccc mostly occupies ecologically marginal habitats. We conclude that Ccc and Ccr represent ecotypes, not vicariant forms. Finally, we suggest that habitat availability, resulting from the interplay of regional-scale and local-scale variables, satisfactorily explains the distributional patterns of Carex curvula ecotypes in the southwestern Alps. Article in Journal/Newspaper Tundra Unknown |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
alpine tundra ecotype niche theory ordination Outlying Mean Index Plant-communities alpine vegetation europe geo envir |
spellingShingle |
alpine tundra ecotype niche theory ordination Outlying Mean Index Plant-communities alpine vegetation europe geo envir Choler, P. Michalet, R. Niche differentiation and distribution of Carex curvula along a bioclimatic gradient in the southwestern Alps |
topic_facet |
alpine tundra ecotype niche theory ordination Outlying Mean Index Plant-communities alpine vegetation europe geo envir |
description |
International audience Carex curvula is a dominant sedge of European alpine tundra, exhibiting two morphological forms: C. curvula ssp. curvula (Ccc) and C. curvula ssp. rosae (Ccr). In this paper, we attempt to explore whether Ccc and Ccr are ecotypes or vicariant forms and whether between- and within-regional distribution patterns can be explained by variations in the amount of available habitats and/or by changes in niche attributes. The study area covered three bioclimatically distinct regions of the southwestern Alps in which local abundances of Ccc and Ccr strongly differ. The realized niche of both forms was investigated by a direct gradient analysis performed on an extensive floristic and environmental data set. We found no evidence of niche overlap between Ccc and Ccr as their distribution curves differ strongly along disturbance, mesotopography and soil acidity gradients. We investigated the effect of region on the structure of local scale variables tables. Highly concordant patterns among regions were found, except that optimal habitat conditions for Ccc were infrequent in the southernmost regions. We compared the ecological behaviour of range centre and range margin populations of each form. We found a narrower ecological amplitude for Ccr in the northern part of its range, whereas for Ccc the niche breadth of range-margin populations was not reduced compared to range centre populations. At its southern range limit, Ccc mostly occupies ecologically marginal habitats. We conclude that Ccc and Ccr represent ecotypes, not vicariant forms. Finally, we suggest that habitat availability, resulting from the interplay of regional-scale and local-scale variables, satisfactorily explains the distributional patterns of Carex curvula ecotypes in the southwestern Alps. |
author2 |
Laboratoire d'Ecologie Alpine (LECA) Université Joseph Fourier - Grenoble 1 (UJF)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Choler, P. Michalet, R. |
author_facet |
Choler, P. Michalet, R. |
author_sort |
Choler, P. |
title |
Niche differentiation and distribution of Carex curvula along a bioclimatic gradient in the southwestern Alps |
title_short |
Niche differentiation and distribution of Carex curvula along a bioclimatic gradient in the southwestern Alps |
title_full |
Niche differentiation and distribution of Carex curvula along a bioclimatic gradient in the southwestern Alps |
title_fullStr |
Niche differentiation and distribution of Carex curvula along a bioclimatic gradient in the southwestern Alps |
title_full_unstemmed |
Niche differentiation and distribution of Carex curvula along a bioclimatic gradient in the southwestern Alps |
title_sort |
niche differentiation and distribution of carex curvula along a bioclimatic gradient in the southwestern alps |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://hal.archives-ouvertes.fr/halsde-00295034 |
genre |
Tundra |
genre_facet |
Tundra |
op_source |
Hyper Article en Ligne - Sciences de l'Homme et de la Société ISSN: 1100-9233 Journal of Vegetation Science Journal of Vegetation Science, Wiley, 2002, 13 (6), pp.851-858 |
op_relation |
halsde-00295034 10670/1.4b3bf2 https://hal.archives-ouvertes.fr/halsde-00295034 |
op_rights |
undefined |
_version_ |
1766229603659022336 |