Land use improves spatial predictions of mountain plant abundance but not presence-absence

Randin, C. F. and Jaccard, H. and Vittoz, P. and Yoccoz, N. G. and Guisan, A.. (2009) Land use improves spatial predictions of mountain plant abundance but not presence-absence. Journal of Vegetation Science, 20 (6). pp. 996-1008.

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Official URL: http://edoc.unibas.ch/46764/

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Question Does a land-use variable improve spatial predictions of plant species presence-absence and abundance models at the regional scale in a mountain landscape? Location Western Swiss Alps. Methods Presence-absence generalized linear models (GLM) and abundance ordinal logistic regression models (LRM) were fitted to data on 78 mountain plant species, with topo-climatic and/or land-use variables available at a 25-m resolution. The additional contribution of land use when added to topo-climatic models was evaluated by: (1) assessing the changes in model fit and (2) predictive power, (3) partitioning the deviance respectively explained by the topo-climatic variables and the land-use variable through variation partitioning, and (5) comparing spatial projections. Results Land use significantly improved the fit of presence-absence models but not their predictive power. In contrast, land use significantly improved both the fit and predictive power of abundance models. Variation partitioning also showed that the individual contribution of land use to the deviance explained by presence-absence models was, on average, weak for both GLM and LRM (3.7% and 4.5%, respectively), but changes in spatial projections could nevertheless be important for some species. Conclusions In this mountain area and at our regional scale, land use is important for predicting abundance, but not presence-absence. The importance of adding land-use information depends on the species considered. Even without a marked effect on model fit and predictive performance, adding land use can affect spatial projections of both presence-absence and abundance models.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Pflanzenökologie (Körner)
UniBasel Contributors:Randin, Christophe
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Opulus Press
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:29 Nov 2017 09:22
Deposited On:29 Nov 2017 09:22

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