Are there differences in point count results between the first six hours after sunrise in subtropical forest bird communities?

Frutos, Antonio E.; Reales, Fabricio; Lammertink, Martjan; Piña, Carlos Ignácio

doi:10.1007/s10336-019-01651-0

Cited by 1 publication

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“…We counted all birds seen or heard during 10 min in a 75 m radius at each point count location. All counts were conducted during the first 4 hours after sunrise and the sampling order of the points within each type of management was alternated between the two samples in each season to reduce any bias associated with bird activity and time of day (Frutos et al 2019). We followed Pearman and Areta (2020) for systematics, and categorized residency status of species based on Fandiño and Giraudo (2010): 1) residents (R): species that remain in the area throughout the year; 2) northern austral migrants (NAM): species that nest in Argentina in spring and summer and migrate northward outside of Argentina during the autumn-winter period; 3) southern austral migrants (SAM): species that nest in the south of Argentina in spring and summer and that disperse to the north and east of Argentina in autumn and winter; and 4) longitudinal migrants of the west (LMW): species that breed in western Argentina in spring and summer and that migrate eastward in Argentina during autumnwinter.…”

Section: Bird Samplesmentioning

confidence: 99%

Bird community changes associated with cattle raising management in the delta forests of the Paraná River

Frutos

Leiva

Piña

2020

Basic and Applied Ecology

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Riparian forests and environments close to watercourses support high biodiversity, which may be modified by human activities. In the Paraná River Delta region, cattle raising is one of the activities with the greatest impact, altering vegetation structure. These changes are reflected in bird communities that inhabit these environments. We hypothesize that the absence of large herbivores (whether cows or native deer) will produce an increase in the vegetation cover of the lower strata of forests, due to the greater height of the herbaceous stratum and greater coverage of the shrub stratum, and that these changes mainly affect the species of birds that use resources associated with these strata. Our objective was to understand the changes in richness and abundance of the bird community among different types of cattle management using a functional aggregation approach of bird species. In the areas with cattle, we found less coverage of the shrub layer, lower height of the herbaceous layer and fewer climbing vines. We found that changes in richness and abundance of bird community were strongly related to species associated with the lower vegetation strata (ground-feeding guild, shrub guild and low canopy guild), and that the responses of the different guilds were not homogeneous. Understanding the direction of changes in bird 2 communities occurring in response to modifications of the environment, allows us to optimize conservation efforts. If these efforts are based on conservation of the environment in its natural state, we should adjust the management of the herbivory to the pristine conditions of the environment. On the other hand, if conservation efforts are based on particular species or groups of species associated with certain resources, the correct management of herbivory by cattle can be essential to obtain successful results.

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Section: Bird Samplesmentioning

confidence: 99%