Threshold and weighted-distance methods: A combined multiscale approach improves explanatory power of forest carabid beetle abundance in agricultural landscape

Bergerot Benjamin, Lemasle Pierre-Gilles, Boussard Hugues, Betbeder Julie, Jambon Olivier, Georges Romain, Croci Solène, Burel Françoise, Baudry Jacques. 2022. Threshold and weighted-distance methods: A combined multiscale approach improves explanatory power of forest carabid beetle abundance in agricultural landscape. Landscape Ecology, 37 : 159-174.

https://doi.org/10.1007/s10980-021-01338-z

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Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Géographie-Aménagement-Urbanisme-Architecture

Résumé : Context: To analyze the scales at which landscape structure influences ecological processes, two approaches with different underlying ecological assumptions exist; the usual threshold method and the weighted-distance method. Objectives: We used abundance of species to test if the combination of weighted-distance and threshold approaches improves the explained variance of landscape metrics. Methods: We developed a workflow using the two approaches to calculate metrics computed at multiple scales. The latter was developed using weighted metrics based on different weighted-distance functions, and one metric could be selected for more than one spatial scale. Then, we tested the explained variance of species distribution (the activity-density of Abax parallelepipedus) by these two approaches applied independently and then together in modeling a specific ecological response. Results: The combination of metrics computed at multiple scales calculated by both weighted-distance and threshold method improved the predictive performance of the models. More precisely, adding metrics derived from the weighted-distance method to the threshold method significantly increased the explained variance when using the same environmental variables. The mean R2 values of the selected model for the threshold method was 0.34 ± 0.10, 0.49 ± 0.11 with the weighted-distance method, and reached 0.71 ± 0.07 with the two methods combined. These results demonstrate the importance of combining metrics using the weighted-distance method and the threshold method. In addition, activity-density was better explained by metrics selected at multiple scales. Conclusions: This study highlights the importance of combining threshold and weighted-distance method at several scales to improve the explanation of ecological responses based on species abundance.

Mots-clés Agrovoc : paysage agricole, Carabidae, écologie des populations, distribution des populations

Mots-clés géographiques Agrovoc : France

Mots-clés complémentaires : Abax parallelepipedus

Mots-clés libres : Multiscale approach, Landscape metrics, Weighed distance

Classification Agris : L20 - Écologie animale
U30 - Méthodes de recherche

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

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