Trophic behavior of insectivorous birds in agroforestry systems immersed in mesophilic forest

Abstract

In order to know the hunting techniques that birds use in the capture of their prey, from August (2018) to January (2019), the bird monitoring was applied, using systematic sampling, point count with fixed radius and intensive search. Observation frequency (FO) and relative abundance index (IAR) were determined. To determine association between birds and hunting techniques, Poisson regression analysis (ARP) was applied. To learn more important hunting techniques, principal component analysis (ACP) was applied. To determine differences between hunting techniques and infer if what is recorded is present, Kruskal-wallis and X² were applied. FO notes that the most frequent hunting techniques are collect (63.7%), inspect (15.32%) and boost (8.06%). The IAR suggests average values of 0.24; 0.25; 0.333; 0.142. The ARP suggests better fit models with an AIC= 49.506. The ACP explains 100% inertia. Kruskal-wallis shows differences in CT and CT-PT-BMM. The X² evidence that what is recorded is expected. There is evidence of sympatric coexistence in registered bird species because there is no competition for the resource or the hunting technique used to capture their prey.