A stratified approach for modeling the distribution of a threatened ant species in the Swiss National Park

Maggini, R., Guisan, A. and Cherix, D. (2002) A stratified approach for modeling the distribution of a threatened ant species in the Swiss National Park. Biodiversity and Conservation, 11 12: 2117-2141. doi:10.1023/A:1021338510860


Author Maggini, R.
Guisan, A.
Cherix, D.
Title A stratified approach for modeling the distribution of a threatened ant species in the Swiss National Park
Journal name Biodiversity and Conservation   Check publisher's open access policy
ISSN 0960-3115
1572-9710
Publication date 2002-12-01
Sub-type Article (original research)
DOI 10.1023/A:1021338510860
Open Access Status Not yet assessed
Volume 11
Issue 12
Start page 2117
End page 2141
Total pages 25
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Language eng
Formatted abstract
We present models predicting the potential distribution of a threatened ant species, Formica exsecta Nyl., in the Swiss National Park (SNP). Data to fit the models have been collected according to a random-stratified design with an equal number of replicates per stratum. The basic aim of such a sampling strategy is to allow the formal testing of biological hypotheses about those factors most likely to account for the distribution of the modeled species. The stratifying factors used in this study were: vegetation, slope angle and slope aspect, the latter two being used as surrogates of solar radiation, considered one of the basic requirements of F. exsecta. Results show that, although the basic stratifying predictors account for more than 50% of the deviance, the incorporation of additional non-spatially explicit predictors into the model, as measured in the field, allows for an increased model performance (up to nearly 75%). However, this was not corroborated by permutation tests. Implementation on a national scale was made for one model only, due to the difficulty of obtaining similar predictors on this scale. The resulting map on the national scale suggests that the species might once have had a broader distribution in Switzerland. Reasons for its particular abundance within the SNP might possibly be related to habitat fragmentation and vegetation transformation outside the SNP boundaries.
Keyword Formica exsecta Nyl.
Generalized linear models
Modeling
Potential distribution maps
Random-stratified sampling
Swiss National Park
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
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