Trophic spectrum of Turdidae birds in a Pinus cembroides forest with two canopy openings
DOI:
https://doi.org/10.29312/remexca.v0i22.1865Keywords:
insectivore avifauna, trophic coexistence, determination of diets, hunting techniquesAbstract
During January to October 2014, variables of insectivorous birds Turdidae were recorded in order to determine patterns of their trophic spectrum considering their feeding techniques and diets in a Pinus cembroides forest under two conditions of apparent disturbance in their canopy opening: semi-preserved (BPS) and disturbed (BPP) in the high protected natural area (ANPPA). It is used Canfield line methods, quadrants with central point and embedded frames, cut and shake of branches, count in points of 25 m with intensive search, capture with fog nets by constant effort; as well as indices of relative abundance (IAR), frequency of observation (Fo); Kruskal-Wallis, multiple correspondences (ACM); indexes of Jacknife1, Shannon-Wiener, Jaccard; c2 tests, Cluster, Poisson regression (ARP). The IAR was similar, Fo show analogy; Kruskal-Wallis there are no differences, ACM formed defined groups; the average richness, diversity and similarity of the entomological orders were relatively low; c2 the proportion of registered individuals are different, cluster graphically there are different groups, ARP there is effect of some plant variables on the abundances of insects and birds. Some patterns of the trophic amplitude of this type of birds were understood; finding that they contribute to the biological control of certain entomological components that could become harmful and forest pests of this type of forest; generating basic knowledge about the role played by the opening of the canopy in the presence of prey; however, it seems not to have it on avifaunal abundances in this particular region of Mexico.
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