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Does plot size affect the performance of GIS-based species distribution models?

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Abstract

Species distribution models are used extensively in predicting the distribution of vegetation across a landscape. Accuracy of the species distribution maps produced by these models deserves attention, since low accuracy maps may lead to erroneous conservation decisions. While plot size is known to influence measures of species richness, its effect on our ability to predict species distribution ranges has not been tested. Our aim is to test whether the accuracy of the distribution maps produced depend on the size of the plot (quadrat) used to collect biological data in the field. In this study, the presences of four plant species were recorded in five sizes of circular plots, with radii ranging from 8 to 100 m. Logistic regression-based models were used to predict the distributions of the four plant species based on empirical evidence of their relationship with eight environmental predictors: distance to river, slope, aspect, altitude, and four principle component axes derived using reflectance values from Aster images. We found that plot size affected the probability of recording the four species, with reductions in plot size generally increasing the frequency of recorded absences. Plot size also significantly affected the likelihood of correctly predicting the distribution of species whenever plot size was below the minimum size required to consistently record species’ presence. Furthermore, the optimal plot size for fitting species distribution models varied among species. Finally, plot size had little impact on overall accuracy, but a strong, positive impact on Kappa accuracy (which provides a stronger measure of model accuracy by accounting for the effects of chance agreements between predictions and observations). Our results suggest that optimal plot size must be considered explicitly in the creation of species distribution models if they are to be successfully adopted into conservation efforts.

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Acknowledgments

We are indebted to the Polytechnic of Namibia, Windhoek, and the many people of Safoentein who assisted with field work. We are grateful to three anonymous reviewers, whose comments helped to improve this paper. We thank Dr. Iris van Duren for her insightful comments on a previous draft of this paper. This research was supported by a grant from the Netherlands Fellowship Program to SP.

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Correspondence to Shubha N. Pandit.

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Pandit, S.N., Hayward, A., de Leeuw, J. et al. Does plot size affect the performance of GIS-based species distribution models?. J Geogr Syst 12, 389–407 (2010). https://doi.org/10.1007/s10109-010-0106-8

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