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Isodars unveil asymmetric effects on habitat use caused by competition between two endangered species

Tarjuelo, Rocío et al.

Oikos: a journal of ecology. Volume 126:Issue 1 (2017); pp 73-81 -- John Wiley & Sons Ltd

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  • Title:
    Isodars unveil asymmetric effects on habitat use caused by competition between two endangered species
  • Author: Tarjuelo, Rocío;
    Traba, Juan;
    Morales, Manuel B.;
    Morris, Douglas W.
  • Found In: Oikos: a journal of ecology. Volume 126:Issue 1 (2017); pp 73-81
  • Journal Title: Oikos: a journal of ecology
  • Subjects: Ecology--Periodicals; Dewey: 570
  • Rights: legaldeposit
  • Publication Details: John Wiley & Sons Ltd
  • Abstract: Abstract :

    In order for competing species to coexist, segregation on some ecological niche component is required and is often mediated by differential habitat use. When unequal competitors are involved, the dominant species tends to displace the subordinate one to its less preferred habitat. Here, we use habitat isodars, an approach which reflects evolutionary stable strategies of habitat selection, to evaluate whether interspecific competition between two competing species with distinct habitat preferences, the little bustard Tetrax tetrax and the great bustard Otis tarda, modulates their habitat use. Field data on these endangered species demonstrate that unequal competitors can coexist without completely segregating on their preferred habitats. The negatively sloped isodar of the subordinate little bustard unveils its competition with the dominant great bustard. Interference from great bustards in secondary cereal habitats reinforces use of preferred natural habitat by little bustards. Studies of density‐dependent habitat selection by a single‐species can thus aid in identifying the effects of competition on community composition, and guide the conservation of at‐risk species. Isodars, in particular, represent a promising method to gain clear knowledge on interspecific competition for species in which experimental manipulations are not feasible.


  • Identifier: System Number: LDEAvdc_100041130439.0x000001; Journal ISSN: 0030-1299; 10.1111/oik.03366
  • Publication Date: 2017
  • Physical Description: Electronic
  • Shelfmark(s): ELD Digital store

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