Diurnal and seasonal variability in bird counts in a forest fragment in southeastern Brazil

Antunes, Alexsander Zamorano

doi:10.1590/s0101-81752008000200011

Cited by 9 publications

(6 citation statements)

References 11 publications

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“…Thus, neither time of day (in contrast to the northern hemisphere) nor month of the year should be given priority. Along with month, seasonality was also unimportant, as in a subtropical setting in southern Brazil (Volpato et al, 2009) and other studies in São Paulo (Antunes, 2008;Cavarzere, 2013). In contrast, rainforests may tend towards more species and individuals being counted during the wet season (Volpato et al, 2009).…”

Section: Discussionmentioning

confidence: 75%

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

Cavarzere¹,

Moraes²,

Roper³

et al. 2013

Pap. Avulsos Zool. (São Paulo)

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Section: Discussionmentioning

confidence: 75%

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

Cavarzere¹,

Moraes²,

Roper³

et al. 2013

Pap. Avulsos Zool. (São Paulo)

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“…The lower frequency of birds vocalization during the non-breading season is considered one reason for the low probability of record them during this season ( VAN HEEZIK & SEDDON 1999, PAGEN et al 2002, besides the seasonal modification in habitat use and in functional groups (BLENDINGER 2005, BOWEN et al 2007, LOPEZ DE CASENAVE et al 2008. Considering this, changes in the detection of bird species using the point count during non-breeding season would be expected also in SSF (ANTUNES 2008). This suggests that other factors seem to have influenced the obtained results in this forest type, like regular distribution of food during the year and changing of behavior (e.g.…”

Section: Discussionmentioning

confidence: 99%

The use of the point count method for bird survey in the Atlantic forest

Volpato

Lopes

Mendonça

et al. 2009

Zoologia (Curitiba, Impr.)

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The point count method has been widely used in tropical forest for sampling bird communities. In the present study, we investigated if data on richness and abundance acquired using the point count method are different comparing spring/summer (breeding season) and fall/winter (non-breeding season) in three types of the Brazilian Atlantic forest. Twelve sites were sampled seasonally during one year. In general we recorded more species and individuals during the breeding seasons. However, bird communities vary seasonally among the forest types and functional groups. We demonstrate that the use of point counts in tropical forest should be adjusted considering the differences in forest types and feeding guilds

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“…Thus, surveys finished precisely 2 h and 45 min after the first sampling point. The morning period has been shown to be the most efficient for point counting in the Atlantic Forest (Antunes ). The radius for detecting vocalizing birds at each point was set to ca.…”

Section: Methodsmentioning

confidence: 99%

Distributions of birds and plants in ecoregions: Implications for the conservation of a neotropical biodiversity hotspot

et al. 2018

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The delineation of unique areas in biodiversity is crucial for conservation planning. However, identification of distinct biotas is a challenging task. In this study, we use an objective analytical process to test if bird and plant species composition of three different forest formation in the Atlantic forest Biome is sufficiently distinct to merit the recognition of ecoregions. We also evaluated how current climatic and spatial factors shape the distribution of plants and birds. Sampling localities were selected in three forest types of southern Brazil: mixed rain forest (MF), seasonal semi‐deciduous forest (SF) and dense rain forest (DF). The point‐centred quarter method and point counts were used to sample plants and birds respectively. Multivariate analyses were used to evaluate species composition, while the Rank Occupancy Abundance Profile was used to determine the association of bird species with each forest type. We used variation partitioning to determine which factors, that is climatic, spatial or tree species abundance (in the case of birds) better explained the distribution of plants and birds. A total of 176 tree species and 270 bird species were recorded. The bird species composition was sufficiently distinct among the three forest types, but the plant species composition was only distinct between DF and MF. Moreover, 61% of bird species were associated with only one forest type. This high association and the different species composition suggest that these forest types are sufficiently distinct to merit the recognition of ecoregions. Plant distribution was mainly affected by climatic variables, while bird distribution was mainly influenced by forest type and less so by climatic variables. Our data suggest that all three forest types should be conserved, but conservation strategies are urgent in MF where only 0.39% of its original cover is under protection.

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Diurnal and seasonal variability in bird counts in a forest fragment in southeastern Brazil

Cited by 9 publications

References 11 publications

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

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

The use of the point count method for bird survey in the Atlantic forest

Distributions of birds and plants in ecoregions: Implications for the conservation of a neotropical biodiversity hotspot

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