Post-logging effects on nest predation and avian predator assemblages in a subtropical forest

Logging represents one of the main threats to bird populations breeding in subtropical forests because the resulting changes in forest structure influence nesting sites and predator-prey interactions. Nest site selection in birds is critical to their survival and reproductive success, because site characteristics can affect predation rates. The aim of this study is to evaluate the abundance of avian nest predators and the rate of predation on artificial nests in post-logging piedmont forests from the southern Yungas. Predation rate on artificial nests was lower in logged forest when compared to unlogged forest. This result may not only be explained by the influence of both micro- and meso-site which provided greater nest concealment, but also by the decrease in density of generalist predators at logged sites. As generalist predators were associated with vegetation cover, lower coverage may be affecting predator density at logging forests. The density of nestling predators, however, was higher in logging forests and was associated with this treatment. Our study suggests that post-logging effects changes the nesting sites and reduce the predation rate on artificial nests as well as the density of nest avian predators like Plushcrested Jay (Cyanocorax chrysops).

Automated summary

Logging poses a major threat to bird populations breeding in subtropical forests, as it influences forest structure and nest site selection, ultimately affecting predation rates. Research indicates that predation rates on artificial nests are lower in logged forests compared to unlogged forests, potentially due to better nest concealment and decreased density of generalist predators. Additionally, the density of nestling predators is higher in logging forests, suggesting post-logging effects impact nesting sites and predator density.