Nested species- rich networks of scavenging vertebrates support high levels of interspecific competition.

Show simple item record Sebastián-González, E. Moleón, M. Gibert, J.P. Guimarães, P.R. Sánchez-Zapata, J.A. Botella, F. Mateo-Tomás, P. Olea, P.P. 2016-05-24T14:26:44Z 2016-05-24T14:26:44Z 2016-01
dc.identifier.citation Sebastián-González, E. et al. 2016. Nested species- rich networks of scavenging vertebrates support high levels of interspecific competition. Ecology 97 (1), pp. 95-105. en_ZA
dc.identifier.issn 0012-9658
dc.description.abstract Disentangling the processes that shape the organization of ecological assemblages and its implications for species coexistence is one of the foremost challenges of ecology. Although insightful advances have recently related community composition and structure with species coexistence in mutualistic and antagonistic networks, little is known regarding other species assemblages, such as those of scavengers exploiting carrion. Here we studied seven assemblages of scavengers feeding on ungulate carcasses in mainland Spain. We used dynamical models to investigate if community composition, species richness and structure (nestedness) affect species coexistence at carcasses. Scavenging networks showed a nested pattern in sites where highly efficient, obligate scavengers (i.e., vultures) were present and a non- nested pattern everywhere else. Griffon Vulture ( Gyps fulvus ) and certain meso- facultative mammalian scavengers (i.e., red fox, Vulpes vulpes, and stone marten, Martes foina ) were the main species contributing to nestedness. Assemblages with vultures were also the richest ones in species. Nested species- rich assemblages with vulture presence were associated with high carcass consumption rates, indicating higher interspecific competition at the local scale. However, the proportion of species stopping the consumption of carrion (as derived from the competitive dynamic model) stabilized at high richness and nestedness levels. This suggests that high species richness and nestedness may characterize scavenging networks that are robust to high levels of interspecific competition for carrion. Some facilitative interactions driven by vultures and major facultative scavengers could be behind these observations. Our findings are relevant for understanding species' coexistence in highly competitive systems. en_ZA
dc.language.iso en en_ZA
dc.publisher Ecological Society of America en_ZA
dc.subject antagonism en_ZA
dc.subject carrion en_ZA
dc.subject coexistence en_ZA
dc.subject ecological approach en_ZA
dc.subject interspecific competition en_ZA
dc.subject mutualism en_ZA
dc.subject nestedness en_ZA
dc.subject raptor en_ZA
dc.subject scavenger en_ZA
dc.subject species richness en_ZA
dc.subject ungulate en_ZA
dc.subject Carrion feeding en_ZA
dc.subject Facilitation en_ZA
dc.subject Interaction network en_ZA
dc.subject Spain en_ZA
dc.subject Ungulate carcasses en_ZA
dc.subject Vertebrate scavengers en_ZA
dc.subject Vultures en_ZA
dc.title Nested species- rich networks of scavenging vertebrates support high levels of interspecific competition. en_ZA
dc.type Article en_ZA

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