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Universitat de Girona. Departament d’Informàtica i Matemàtica Aplicada  
Martín Fernández, Josep Antoni
Pierotti, Michele E. R. Barceló i Vidal, Carles 

The variety of resources that a population exploits is known as the “niche width”. A particularpopulation has a narrow niche if only few kinds of the available resources are exploited by its members.When the individuals of a population exploit many different resources, then the population has awide niche. From this point of view it seems that the niche is a property of the population as awhole. However, it is well known that many apparently generalist populations are in fact composedof individual specialists, that is, members that use only small subsets of the population’s niche. Thisapproach justifies the definition of indices to measure the individuallevel resource specialization.Although this kind of analysis could be applied to any niche variation: oviposition sites, habitat, etc.,we focus the discussion in terms of analysis of diet data. So as to measure species niche breadth acomparison between the frequency distribution of the species’ resource use with that of all availableresources is carried out. When a measure of individual specialization is considered, then one shouldcompare the population’s total diet with the individual use. In particular, the total niche width of apopulation should be compared with its two components: within and betweenindividual variation. Inthis sense, in the literature several indices of intrapopulation niche variation are proposed. Our goal isto describe, compare and evaluate four of the most relevant indices applied in ecology. In this work wepoint out how these techniques could be developed in a compositional framework, particularly whenthese indices are applied to discrete diet data [e.g. frequency of different prey specimen in the diet].  
http://hdl.handle.net/2072/273638  
eng  
Universitat de Girona. Departament d’Informàtica i Matemàtica Aplicada  
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Examining Indices of Individuallevel Resource Specialization  
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