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Network topology of stable isotope interactions in a sub-arctic raptor guild
Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen. University of Oviedo, Spain; University of Pretoria, South Africa.ORCID-id: 0000-0001-9737-8242
Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen. Swedish Museum of Natural History, Sweden.
Stockholms universitet, Naturvetenskapliga fakulteten, Zoologiska institutionen.
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Antal upphovsmän: 62016 (Engelska)Ingår i: Oecologia, ISSN 0029-8549, E-ISSN 1432-1939, Vol. 182, nr 2, s. 511-518Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Predation is an ecologically important process, and intra-guild interactions may substantially influence the ecological effects of predator species. Despite a rapid expansion in the use of mathematical graph theory to describe trophic relations, network approaches have rarely been used to study interactions within predator assemblages. Assemblages of diurnal raptors are subject to substantial intra- and interspecific competition. Here we used the novel approach of applying analyzes based on network topology to species-specific data on the stable isotopes C-13 and N-15 in feathers to evaluate patterns of relative resource utilization within a guild of diurnal raptors in northern Sweden. Our guild consisted of the golden eagle (Aquila chrysaetos), the gyrfalcon (Falco rusticolus), the peregrine falcon (Falco peregrinus) and the rough-legged buzzard (Buteo lagopus). We found a modular trophic interaction structure within the guild, but the interactions were less nested than expected by chance. These results suggest low redundancy and hence a strong ecological importance of individual species. Our data also suggested that species were less connected through intra-guild interactions than expected by chance. We interpret our results as a convergence on specific isotope niches, and that body size and different hunting behaviour may mediate competition within these niches. We finally highlight that generalist predators could be ecologically important by linking specialist predator species with disparate dietary niches.

Ort, förlag, år, upplaga, sidor
2016. Vol. 182, nr 2, s. 511-518
Nyckelord [en]
Predation, Inter-specific interactions, Graph theory, Competition, Resource partitioning
Nationell ämneskategori
Biologiska vetenskaper
Identifikatorer
URN: urn:nbn:se:su:diva-136094DOI: 10.1007/s00442-016-3658-6ISI: 000383669300017PubMedID: 27209296OAI: oai:DiVA.org:su-136094DiVA, id: diva2:1050992
Tillgänglig från: 2016-11-30 Skapad: 2016-11-29 Senast uppdaterad: 2020-03-04Bibliografiskt granskad

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