Artigo

Effects of roads on movements by understory birds in mixed-species flocks in Central Amazonian Brazil

Roads through tropical forest create linear disturbances that have unknown consequences for forest birds. We studied how a narrow, rarely used road through otherwise undisturbed Amazonian forest affected the movements and area requirements of understory birds that form mixed-species flocks. Differen...

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Autor principal: Develey, Pedro Ferreira
Outros Autores: Stouffer, Philip C.
Grau: Artigo
Idioma: English
Publicado em: Conservation Biology 2020
Assuntos:
Avifauna
Ecological Impact
Movement
Range Size
Roadside Environment
Understory
Brasil
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/19107
id oai:repositorio:1-19107
recordtype dspace
spelling oai:repositorio:1-19107 Effects of roads on movements by understory birds in mixed-species flocks in Central Amazonian Brazil Develey, Pedro Ferreira Stouffer, Philip C. Avifauna Ecological Impact Movement Range Size Roadside Environment Understory Brasil Roads through tropical forest create linear disturbances that have unknown consequences for forest birds. We studied how a narrow, rarely used road through otherwise undisturbed Amazonian forest affected the movements and area requirements of understory birds that form mixed-species flocks. Differences in road maintenance led to two distinct treatments along the same road. Trees along the "closed" road formed a partial canopy connecting the two sides of the road, although the roadway itself was kept open. The "open" road was regularly maintained, making a complete opening 10-30 m wide. We followed 15 flocks, 5 each in interior forest, along the open road, and along the closed road. These flocks were led by Thamnomanes antshrikes, and each flock had a discreet, permanent territory. Flock territory size (mean=8.5 ha) did not differ among the three locations. The open road formed the territorial boundary for all five flocks, although birds moved within a few meters of the edge of the road. The closed road was less of a barrier: 2 of 5 flocks used both sides of the closed road. Playback experiments showed that flocks readily crossed the closed road to approach agonistic vocalizations. Along the open road, even though birds responded to playback by becoming agitated and moving to the extreme edge of the roadside vegetation, they were less likely to cross the road and did so only after a longer duration of playback. Our results suggest that flocks respond to a road as they would to a long linear gap. They use the vegetation along the edges of the road, but because they are unwilling to cross the open area, it becomes a flock territory boundary. Similarly, as in forest gaps, successional change along the closed road produced suitable habitat for flocks. Although this suggests that roads are a trivial problem, we caution that this result applies only to narrow roads that are not accompanied by deforestation or other disturbance. 2020-06-15T22:05:26Z 2020-06-15T22:05:26Z 2001 Artigo https://repositorio.inpa.gov.br/handle/1/19107 10.1046/j.1523-1739.2001.00170.x en Volume 15, Número 5, Pags. 1416-1422 Restrito Conservation Biology
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language English
topic Avifauna
Ecological Impact
Movement
Range Size
Roadside Environment
Understory
Brasil
spellingShingle Avifauna
Ecological Impact
Movement
Range Size
Roadside Environment
Understory
Brasil
Develey, Pedro Ferreira
Effects of roads on movements by understory birds in mixed-species flocks in Central Amazonian Brazil
topic_facet Avifauna
Ecological Impact
Movement
Range Size
Roadside Environment
Understory
Brasil
description Roads through tropical forest create linear disturbances that have unknown consequences for forest birds. We studied how a narrow, rarely used road through otherwise undisturbed Amazonian forest affected the movements and area requirements of understory birds that form mixed-species flocks. Differences in road maintenance led to two distinct treatments along the same road. Trees along the "closed" road formed a partial canopy connecting the two sides of the road, although the roadway itself was kept open. The "open" road was regularly maintained, making a complete opening 10-30 m wide. We followed 15 flocks, 5 each in interior forest, along the open road, and along the closed road. These flocks were led by Thamnomanes antshrikes, and each flock had a discreet, permanent territory. Flock territory size (mean=8.5 ha) did not differ among the three locations. The open road formed the territorial boundary for all five flocks, although birds moved within a few meters of the edge of the road. The closed road was less of a barrier: 2 of 5 flocks used both sides of the closed road. Playback experiments showed that flocks readily crossed the closed road to approach agonistic vocalizations. Along the open road, even though birds responded to playback by becoming agitated and moving to the extreme edge of the roadside vegetation, they were less likely to cross the road and did so only after a longer duration of playback. Our results suggest that flocks respond to a road as they would to a long linear gap. They use the vegetation along the edges of the road, but because they are unwilling to cross the open area, it becomes a flock territory boundary. Similarly, as in forest gaps, successional change along the closed road produced suitable habitat for flocks. Although this suggests that roads are a trivial problem, we caution that this result applies only to narrow roads that are not accompanied by deforestation or other disturbance.
format Artigo
author Develey, Pedro Ferreira
author2 Stouffer, Philip C.
author2Str Stouffer, Philip C.
title Effects of roads on movements by understory birds in mixed-species flocks in Central Amazonian Brazil
title_short Effects of roads on movements by understory birds in mixed-species flocks in Central Amazonian Brazil
title_full Effects of roads on movements by understory birds in mixed-species flocks in Central Amazonian Brazil
title_fullStr Effects of roads on movements by understory birds in mixed-species flocks in Central Amazonian Brazil
title_full_unstemmed Effects of roads on movements by understory birds in mixed-species flocks in Central Amazonian Brazil
title_sort effects of roads on movements by understory birds in mixed-species flocks in central amazonian brazil
publisher Conservation Biology
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/19107
_version_ 1787141639009992704
score 11.653393

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