Co-occurrence patterns in a steppe bird community : insights into the role of dominance and competition

• Published in: Oikos
• Main Authors: Barrero, Adrian, Ovaskainen, Otso, Traba, Juan, Gomez-Catasus, Julia
• Other Authors: Organismal and Evolutionary Biology Research Programme, Otso Ovaskainen / Principal Investigator
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2023
• Subjects: Biotic associations; Dominant hierarchy; Ecological niches; Resource partitioning; Species co-occurrence; Steppe passerines; 1181 Ecology; evolutionary biology; Eurasian Skylark
• Online Access: http://hdl.handle.net/10138/563104

Spatial co-occurrence patterns are determined by environmental factors, such as food availability or habitat characteristics and by biotic associations. When resources are limited, competition which implies a dominant hierarchy can shape species assemblage. Here, we study space and time co-occurrence of steppe passerines during the breeding season in a natural steppe habitat, its modulation by environmental filtering, potential biotic interactions and random processes. We applied the joint species distribution model of hierarchical modelling of species community (HMSC) to data on species presence-absence and environmental, temporal and spatial covariates acquired from seven plots in a natural steppe in central Spain during two consecutive years. Our results reveal the patterns of bird species co-occurrence and suggest that this assemblage might be competitively structured. The assemblage appears to be configured around one dominant species, the Eurasian skylark, which establishes principally negative associations with many of the coexistent species. Our results contribute to the understanding of how competition and dominance processes, together with ecological constraints and other biotic associations, shape bird assemblages. Peer reviewed