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Oecologia

, Volume 182, Issue 2, pp 511–518 | Cite as

Network topology of stable isotope interactions in a sub-arctic raptor guild

  • F. Dalerum
  • P. Hellström
  • M. Miranda
  • J. Nyström
  • J. Ekenstedt
  • A. Angerbjörn
Community ecology – original research
  • 305 Downloads

Abstract

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 13C and 15N 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.

Keywords

Predation Inter-specific interactions Graph theory Competition Resource partitioning 

Notes

Author contribution statement

FD and AA conceived the study, PH, JN and JE conducted the research, FD and MM analyzed the data, FD, MM, AA and PH wrote the manuscript.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • F. Dalerum
    • 1
    • 2
    • 3
  • P. Hellström
    • 3
    • 4
  • M. Miranda
    • 5
    • 6
  • J. Nyström
    • 3
  • J. Ekenstedt
    • 3
  • A. Angerbjörn
    • 3
  1. 1.Research Unit of Biodiversity (UO-CSIC-PA)University of OviedoMieresSpain
  2. 2.Mammal Research Institute, Department of Zoology and EntomologyUniversity of PretoriaPretoriaSouth Africa
  3. 3.Department of ZoologyStockholm UniversityStockholmSweden
  4. 4.Department of Environmental Research and MonitoringSwedish Museum of Natural HistoryStockholmSweden
  5. 5.Centre for African Ecology, School of Animal, Plant and Environmental SciencesUniversity of the WitwatersrandJohannesburgSouth Africa
  6. 6.Department of EconomicsUniversity of OviedoOviedoSpain

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