Recommendations for monitoring avian populations with point counts: a case study in southeastern Brazil

Cavarzere, Vagner; Moraes, Gabriel Parmezani; Roper, James J.; Silveira, Luís Fábio; Donatelli, Reginaldo José

doi:10.1590/s0031-10492013003200001

Cited by 3 publications

(2 citation statements)

References 43 publications

(32 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We sampled each sampling unit for two days, and we sampled each sampling point four times (as if they had been sampled on four mornings). Studies performed in the Atlantic Forest using the point count method demonstrated that 3 to 5 days of sampling are sufficient to detect more than 90% of the species recorded in a sample area (Anjos 2007, Cavarzere et al 2013. Sampling began shortly after sunrise, when daytime birds start to vocalize, and ended 2.5 h after sampling at the first point, under favorable climatic conditions.…”

Section: Bird Samplingmentioning

confidence: 99%

Bird species that occupy river edge in continuous forest tend to be less sensitive to forest fragmentation

Lindsey

Bochio

Anjos

2019

Rev. Bras. Ornitol.

View full text Add to dashboard Cite

Along a distance gradient from a given river, two types of habitat can be recognized: natural river edge and forest interior, each one with its own vegetation characteristics and dynamics. In a continuous area of the Brazilian Atlantic Forest, we investigated (1) if bird communities are different between a riverbank of a small stream and an inland forest habitat; (2) if the species of the river edge habitat are the ones that persist in the most in forest fragments after deforestation of a continuous forest; (3) if the river edge habitat species are those that are less sensitive to forest fragmentation. It is expected that there are differences in the bird communities and the occupancy of some species between the two habitats. We allocated 16 sampling points in each of the habitats and sampled the birds by point counts with a short radius of 30 m. Results suggest that there is a significant difference between the composition of the bird communities of the river edge and forest interior habitats, although the species richness is similar. Six species were more likely to occupy the river edge and 14 species had a greater probability of occupancy in the forest interior. Species associated with the river edge habitat (15 species) tend not to be sensitive to forest fragmentation (12 species). In this study, we demonstrated that river-border species of continuous forest areas form a significant part of the bird communities that persist in small forest fragments, with intense edge effect. This shows that not all forest edge species are the result of the colonization from open areas. Congruently, species that occupy the most distant areas from the river vegetation in a continuous forest are those more sensitive to forest fragmentation. KEYWORDS: Atlantic Rainforest, bird sensitivity, forest interior, natural edge, probability of occupancy. tree species; also, it is common to have the fall of trees and consequently the creation of clearings that allow the occupation of bamboo species (Bianchini et al. 2001, Anjos et al. 2007). This lowland riparian environment constitutes a transition between the river and the associated upland forest, marking a natural border or ecotone boundary. A forest ecotone is a consequence of the meeting of distinct natural plant communities, which, in turn, influences the diversity of wild animals across the landscape, dependent on distance from a rivers' edge and the characteristic transition in topography, plant community, hydrological regimes, and soil types (Naiman et al. 1993, Shirley 2005). Considering several taxonomic groups, some studies suggest greater species richness in riparian environments compared to distinct forest (Naiman et al. 1993), others found greater richness in non-riparian environments (McGaragal & McComb 1992, Peres 1997) and some found no difference between these two habitat types (Gomez & Anthony 1998, Rykken et al. 2007). On birds, several studies indicated the great importance of the riparian environment (natural river edges) as a uniquely sustaining habitat with relat...

show abstract

Section: Bird Samplingmentioning

confidence: 99%

Bird species that occupy river edge in continuous forest tend to be less sensitive to forest fragmentation

Lindsey

Bochio

Anjos

2019

Rev. Bras. Ornitol.

View full text Add to dashboard Cite

show abstract

“…We used the counting point sampling method to record species richness and number of individuals in each area (Volpato et al 2009). Two observers remained for 15 minutes at each point (Cavarzere et al 2013) and recorded birds sighted and heard within approximately 30 m. Samples were taken from October to December 2016, during the reproductive period of most bird species in southern Brazil (Belton 1994).…”

Section: Data Collectionmentioning

confidence: 99%

Bird Fauna in Secondary Forest Stages: A Study in a Southern Brazilian Protected Area

et al. 2019

View full text Add to dashboard Cite

Environmental changes resulting from forest succession process may lead to changes in the abundance and composition of species. In each successional stage, faunal composition will depend on the structure of the habitats and the ecological requirements of each species. The effects seem to be more evident in small isolated forest fragments. In this study we recorded bird species composition and richness at different stages of secondary forest in a protected area located in a highly-fragmented region in southern Brazil. We predicted that bird species composition and richness will change according to the secondary forest stage, and will be affected by the ecological requirements of species. The study was carried out in the Mata do Rio Uruguai Teixeira Soares Municipal Park (TSP), in the northern part of the state of Rio Grande do Sul, Brazil. The park is the largest protected area in the region, with 423 ha. Representative areas of the three successional stages of secondary forest within TSP were selected, and the bird species in each area were recorded using the counting point sampling method. A total of 145 bird species were recorded in the three areas. There were differences in species composition between the areas, indicating that the structure of the bird community is directly linked to successional stages. This relationship is improved by differences in the number of birds with certain ecological traits between the areas. The size, connectivity of the forest fragments and the availability of habitats may be affecting the distribution of the avifauna in the park. Changes in the landscape may promote a restructuring of avifaunal communities, where species with certain ecological traits can be favored or excluded. The TSP, although relatively small, is important for the maintenance of bird species because it is a rare, well-preserved fragmented of the deciduous seasonal forest in the region.

show abstract

Temporal beta diversity of bird species using the point count method indicates predominance of turnover over nestedness in an Atlantic Forest site

Oliveira,

Barreto,

dos Anjos

2023

Ornithol. Res.

View full text Add to dashboard Cite

Recommendations for monitoring avian populations with point counts: a case study in southeastern Brazil

Abstract: In the northern hemisphere, bird counts have been fundamental in gathering data

Cited by 3 publications

References 43 publications

Bird species that occupy river edge in continuous forest tend to be less sensitive to forest fragmentation

Bird species that occupy river edge in continuous forest tend to be less sensitive to forest fragmentation

Bird Fauna in Secondary Forest Stages: A Study in a Southern Brazilian Protected Area

Temporal beta diversity of bird species using the point count method indicates predominance of turnover over nestedness in an Atlantic Forest site

Contact Info

Product

Resources

About