Diversity of beetle species and functional traits along gradients of deadwood suggests weak environmental filtering  

作　　者：Marco Basile Francesco Parisi Roberto Tognetti Saverio Francini Fabio Lombardi Marco Marchetti Davide Travaglini Elena De Santis Gherardo Chirici 

机构地区：[1]Swiss Federal Research Institute WSL,Zürcherstrasse 111,8903,Birmensdorf,Switzerland [2]Swiss Ornithological Institute,Seerose 1,6204,Sempach,Switzerland [3]GeoLAB-Laboratory of Forest Geomatics,Department of Agriculture,Food,Environment and Forestry,Universita degli Studi di Firenze,Firenze,Italy [4]Dipartimento Agricoltura,Ambiente e Alimenti,Universita degli Studi del Molise,Via De Sanctis,86100,Campobasso,Italy [5]Fondazione per il Futuro delle Citta,Firenze,Italy [6]Dipartimento di Agraria,Universita Mediterranea di Reggio Calabria,Localita di Feo di Vito,Reggio Calabria,89122,Italy [7]Dipartimento di Bioscienze e Territorio,Universita degli Studi del Molise,Contrada Fonte Lappone,86090,Pesche,Italy

出　　处：《Forest Ecosystems》2023年第1期56-63,共8页森林生态系统（英文版）

基　　金：funded by CONACYT for funding provided through project A1-S-21471。

摘　　要：Background: Gradients in local environmental characteristics may favour the abundance of species with particular traits, while other species decline, or favour species with different traits at the same time, without an increase in average species abundances. Therefore, we asked: do variations in species and traits differ along gradients of deadwood variables? Do species abundance and trait occurrence change with species richness within or between functional groups? Thus, we analysed the beetle assemblages of five forest sites located in Italy, along the Apennines mountains.Methods: From 2012 to 2018 we sampled beetles and five deadwood types in 193 plots to characterise the deadwood gradient: standing dead trees, snags, dead downed trees, coarse woody debris, and stumps. We modelled beetle species relative abundances and trophic traits occurrences against the deadwood variables using joint species distribution models.Results: Out of 462 species, only 77 showed significant responses to at least one deadwood type, with a weak mean response across species. Trophic groups showed mostly negative responses to deadwood variables. Species abundance increased with species richness among sites only for phytophagous and saproxylophagous. Trait occurrence did not increase with species richness among sites, except for phytophagous and saproxylophagous.However, trait occurrence changed significantly with species richness of several trophic groups within some sites.We found that increases in species richness do not result in decreases in species abundance of a given trophic group, but rather null or positive relationships were found suggesting low interspecific competition.Conclusions: Our findings suggest that in Mediterranean mountain forests there is still room for increasing the level of naturalness, at least for what concerns deadwood management. On one side, our findings suggest that competition for deadwood substrates is still low, on the other side they indicate that increasing deadwood volume and types to improve overa

关 键 词：ABUNDANCE Forest ITALY Joint species distribution model SAPROXYLIC Trophic group 

分 类 号：S763.18[农业科学—森林保护学]