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Empirical realised niche models for British higher and lower plants – development and preliminary testing

Smart, Simon M.; Scott, W. Andrew; Whitaker, Jeanette; Hill, Mark O.; Roy, David B.; Critchley, C. Nigel; Marina, Lorenzo; Evans, Christopher; Emmett, Bridget A.; Rowe, Edwin C.; Crowe, Andrew; Marrs, Robert H.. 2010 Empirical realised niche models for British higher and lower plants – development and preliminary testing. Journal of Vegetation Science, 21. 643-656. 10.1111/j.1654-1103.2010.01173.x

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Abstract/Summary

Question: Can useful realised niche models be constructed for British plant species using climate, canopy height and mean Ellenberg indices as explanatory variables? Location: Great Britain. Methods: Generalised linear models were constructed using occurrence data covering all major natural and semi-natural vegetation types (n=40 683 quadrat samples). Paired species and soil records were only available for 4% of the training data (n=1033) so modelling was carried out in two stages. First, multiple regression was used to express mean Ellenberg values for moisture, pH and fertility, in terms of direct soil measurements. Next, species presence/absence was modelled using mean indicator scores, cover-weighted canopy height, three climate variables and interactions between these factors, but correcting for the presence of each target species in training plots to avoid circularity. Results: Eight hundred and three higher plants and 327 bryophytes were modelled. Thirteen per cent of the niche models for higher plants were tested against an independent survey dataset not used to build the models. Models performed better when predictions were based only on indices derived from the species composition of each plot rather than measured soil variables. This reflects the high variation in vegetation indices that was not explained by the measured soil variables. Conclusions: The models should be used to estimate expected habitat suitability rather than to predict species presence. Least uncertainty also attaches to their use as risk assessment and monitoring tools on nature reserves because they can be solved using mean environmental indicators calculated from the existing species composition, with or without climate data.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1654-1103.2010.01173.x
Programmes: CEH Topics & Objectives 2009 - 2012 > Biodiversity > BD Topic 3 - Managing Biodiversity and Ecosystem Services in a Changing Environment
CEH Sections: Shore
Pywell
Emmett
Parr
ISSN: 1100-9233
Additional Keywords: biodiversity, climate change, conservation, Ellenberg values, GLMM, Great Britain, large scale, logistic regression, risk assessment, spatial autocorrelation
NORA Subject Terms: Botany
Ecology and Environment
Date made live: 06 Jul 2010 11:45
URI: http://nora.nerc.ac.uk/id/eprint/8713

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