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Title

Predator trophic guild assignment: The importance of the method of diet quantification

AuthorsFedriani, José M. ; Travaini, Alejandro
Issue Date2000
PublisherSociété nationale d'acclimatation et de protection de la nature
CitationRevue d'Ecologie (La Terre et la Vie) 55: 129- 139 (2000)
AbstractWe quantitatively assessed the effect of three Methods of Diet Quantification (MDQ) (based on frequency of occurrence of prey, dry weight of prey remains, or estimation of fresh biomass ingested) on guild classification of three carnivores species based on five data sets. Diet dissimilarity matrices and recognition of trophic guilds were dependent on MDQ. Both omnivorous (Red Fox, Vulpes vulpes, and Eurasian Badger, Meles meles) shifted to different trophic guilds depending of the MDQ chosen, whereas Iberian Lynx (Lynx pardinus) remained consistently in the rabbit-eating guild. As a way to assess the pervasiveness of inconsistencies in guild classification, we applied our approach to six other predator assemblages. The number of recognized guilds shifted as a result of MDQ in 4 of 6 comparisons, changes in guild membership occurred in all assemblages, and mean percentage of guildmate fidelity was only 30 % (1SD = ± 21, n = 6). The choice of MDQ depends on the specific ecological question to be addressed with the data. When investigators focus on the effects of prey on predators, an estimate of biomass ingested seems the best choice, but when the focus is on the effects of predators on prey, an approach based on prey numbers is more appropiate.
URIhttp://hdl.handle.net/10261/58636
ISSN0249-7395
Appears in Collections:(EBD) Artículos
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