Abstract
We studied the saproxylic beetle community inhabiting deadwood in remnants of riparian cloud forests in “La Antigua” basin, in central Veracruz (Mexico). We assessed the influence of deadwood features (tree species, trunk position, trunk diameter, trunk volume and decomposition stages) on saproxylic beetle diversity. In order to assess the stability of beetle species-deadwood interactions, we also analyzed the ecological networks structure. A total of 63 deadwood trunks, belonging to four tree species, were sampled by standardized hand-collection throughout well-preserved remnants of riparian cloud forest. We found that tree species and deadwood decay stage are the main drivers that determine the diversity and stability of saproxylic beetle species interactions. Our results indicate that Quercus corrugata is the main tree species in terms of maintaining the significantly highest saproxylic beetle diversity, but with no stable interactions (saproxylic beetle-deadwood). A nested network structure was detected for Clethra mexicana and Liquidambar styraciflua, with a pool of core (generalist) saproxylic beetle species. We observed that beetle diversity from the early and late deadwood stages comprises distinct assemblages and the four stages of decomposition showed a nested network structure. During deadwood succession, community composition and guilds changed among networks; the early successional stage had more specialized xylophagous beetles, while other guilds (mycophagous, saprophagous and zoophagous) arrive later and become the core species in the advanced stages of decomposition networks. Heliscus tropicus (Passalidae) is a key species constituting the core of all of the networks and could be considered an ecosystem engineer in cloud forests. By exploring links between saproxylic beetles and deadwood characteristics, we can further our understanding of species interaction in order to develop management strategies oriented towards the protection of species and their habitats in this threatened ecosystem.
Highlights
Deadwood has been widely studied over the last few decades [1,2] due to its contribution to maintaining functional biodiversity in forest environments [3,4,5,6]
With regard to the most abundant beetle species, we found Heliscus tropicus (Percheron, 1835) represented by 41% (Passalidae) of the individuals collected, followed by Osorius sp.1 with 17% (Staphylinidae)
Generalized Linear Models (GLM) showed that saproxylic beetle abundance differed significantly for tree species (χ2 = 72.60, df = 3, p
Summary
Deadwood has been widely studied over the last few decades [1,2] due to its contribution to maintaining functional biodiversity in forest environments [3,4,5,6]. Saproxylic beetle diversity has been utilized for conservation purposes since these species are highly sensitive to forest management and habitat degradation [6,12]. Since deadwood is an ephemeral microhabitat, saproxylic beetles are highly vulnerable to wood extraction for fuel, among other human forest practices [12]. Studies in tropical forested environments have attempted to elucidate biological and ecological aspects of some beetle species of the families Scarabaeidae, Passalidae and Cerambycidae, which are directly associated with wood degradation [13,14,15,16,17,18,19,20,21]. Their study revealed that saproxylic beetle species are highly affected by both host tree species and wood decomposition stage
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