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The scale of saproxylic beetles response to landscape structure depends on their habitat stability

Abstract : Context Forest management and disturbances cause habitat fragmentation for saproxylic species living on old-growth attributes. The degree of habitat spatiotemporal continuity required by these species is a key question for designing biodiversity-friendly forestry, and it strongly depends on species' dispersal. The 'stability-dispersal' model predicts that species using stable habitats should have lower dispersal abilities than species associated with ephemeral habitat and thus respond to habitat availability at smaller scales. Objectives We aimed at testing the stability-dispersal model by comparing the spatial scales at which saproxylic beetle guilds using substrates with contrasted stability (from stable to ephemeral: cavicolous, fungicolous, saproxylophagous and xylophagous guilds) are affected by landscape structure (i.e. habitat amount and aggregation). Methods We sampled saproxylic beetles using a spatially nested design (plots within landscape windows). We quantified habitat availability (tree cavities, polypores and deadwood) in 1-ha plots, 26-ha buffers around plots and 506-ha windows, and analyzed their effect on the abundance and diversity of associated guilds. Results The habitat amount within plots and buffers positively affected the abundance of the cavicolous and the fungicolous guilds whereas saproxylophagous and xylophagous did not respond at these scales. The habitat aggregation within windows only positively affected the saproxylophagous species richness within plots and also on the similarity in species composition among plots. Conclusions Beetle guilds specialized on more stable habitat were affected by landscape structure at smaller spatial scales, which corroborated the stability-dispersal model. In managed forests, the spatial grain of conservation efforts should therefore be adapted to the target habitat lifetime.
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https://hal.inrae.fr/hal-02609971
Déposant : Migration Irstea Publications <>
Soumis le : samedi 16 mai 2020 - 18:52:15
Dernière modification le : mardi 29 septembre 2020 - 12:34:03

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G. Percel, F. Laroche, Christophe Bouget. The scale of saproxylic beetles response to landscape structure depends on their habitat stability. Landscape Ecology, Springer Verlag, 2019, 34 (8), pp.1905-1918. ⟨10.1007/s10980-019-00857-0⟩. ⟨hal-02609971⟩

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