Abstract

ROMERO-DIAZ, Claudio et al. Coexistence and trophic segregation in insectivorous birds of a températe forest with three elevations. Ecosistemas y recur. agropecuarios [online]. 2018, vol.5, n.15, pp.477-489. ISSN 2007-901X.  https://doi.org/10.19136/era.a5n15.1596.

In order to infer patterns of coexistence and trophic segregation for temperate forest birds in three elevations of the San Bernardino Basin, State of México, trophic tracking of insectivorous birds was carried out from October 2016 to January 2017. Cut-shaking of branches, intensive searches, mist nets, excreta analysis and insect identification were used. Frequency of observation analysis (Fo), Poisson regression (PRA), X2, the Kruskal-Wallis test and simple correspondence analysis (SCA) were used. The overall average valué for Fo indicates that the most used hunting technique is to collect (Fo = 91%) and for PRA to collect and remove (Pr > Z = -7.291, 0.929). The orders of insects consumed are Coleóptera and Hymenoptera (Pr > Z = < 13, 6.959). The X2 shows that what was recorded is similar to what was expected (Prob > Chisq = 0.572 1, 0.247 4, 0.295 6, 0.508 9). Kruskal-Wallis shows that hunting-diet techniques are similar (Prob > Chi square = 0.537 1, 0.262 2, 0.180 9, 0.466 5). The SCA shows coexistence in the formation of four avifaunal groups (Inertia = 100, 47.87, 28.84, 83.15%; hunting techniques, orders, families, types of insects, respectively). Elevation is not a determinant of trophic coexistence, since it does not affect the availability of prey, so it does not modify the hunting techniques used by birds, exhibiting similar diets, with trophic sympatry. Habitat improvement strategies that promote the availability of prey for this type of bird are recommended.

Keywords : Avifauna; systematic sampling; San Bernardino.

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