Macaw abundance in relation to human population density in the western amazon basin

Brooks, David W.; Begazo, Alfredo J.

doi:10.1007/978-1-4615-1531-9_20

Cited by 2 publications

(1 citation statement)

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“…All these missing diurnal raptors are large, supporting the fact that large diurnal raptors have high sensitivity to disturbance in areas with high human population densities (Thiollay 1994). Similarly, the decline of four macaws in the Peruvian and Colombian Amazon was related to human population density (Brooks and Begazo 2001).…”

Section: Discussionmentioning

confidence: 94%

Distribution patterns of diurnal raptors in open and forested habitats in south-eastern Brazil and the effects of urbanization

Eduardo¹,

Carvalho²,

Marini

2007

Bird Conservation International

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SummaryDiurnal raptors may be highly sensitive to anthropogenic disturbances. We evaluated the diversity and abundance of diurnal raptors at an Atlantic Forest-cerrado transition zone in relation to two habitat types (forest fragments and open habitats) and to urbanization, comparing natural open and forested habitats with corresponding habitats within a large urban area. We sampled 80 points, 20 in each of four habitats (semi-natural and urban forests, seminatural and urban open areas), during 12 months. Diurnal raptors recorded (21 species) included only three out of 10 species with some level of threat in the region. Forested habitats had more species (17) than open habitats (12). Urban areas had only 14 (67%) species, whereas seminatural areas had all 21 species. Diurnal raptors were as abundant in urban areas as in seminatural areas in spite of a loss in species richness in urban areas. A re-analysis without Caracara plancus showed that urban areas had a lower mean number of individuals per point than seminatural areas. Overall species richness usually fluctuated from 14 to 16 species, being slightly higher between January and May than in other months. Overall abundance of diurnal raptors was much higher during summer than during winter. Local extinction may have already occurred for some species of diurnal raptors in the region and will probably shortly include several others. At least C. plancus, a habitat generalist, requires further studies and eventually management actions, since it is able to reach high population numbers in urbanized areas. Furthermore, highly sensitive species that were not recorded require further investigation regarding their conservation status. ResumoRaptores diurnos podem ser altamente sensíveis a perturbaçõ es antropogênicas. Avaliamos a diversidade e a abundância de raptores diurnos em uma região de transição entre Floresta Atlântica e Cerrado em relação a dois tipos de hábitats (fragmentos florestais e hábitats abertos) e à urbanização, comparando hábitats abertos e florestais aos hábitats correspondentes dentro de uma área urbana. Amostramos 80 pontos, 20 em cada um dos quatro hábitats (florestas seminaturais e urbanas, áreas abertas semi-naturais e urbanas) durante 12 meses. Entre os raptores diurnos registrados (21 espécies) estão apenas três das 10 espécies com algum nível de ameaça na região. Mais espécies foram registradas nos hábitats florestados (17) do que nos hábitats abertos (12). Apenas 14 (67 %) espécies foram registradas nas áreas urbanas, enquanto as 21 espécies foram registradas nas áreas semi-naturais. Os raptores diurnos foram igualmente abundantes nas áreas urbanas e nas áreas semi-naturais independentemente da perda de espécies nas áreas urbanas. Uma nova análise sem Caracara plancus mostrou que as áreas urbanas tiveram um menor nú mero médio de indivíduos por ponto do que as áreas semi-naturais. A riqueza total de espécies foi de 14 e 16 espécies, em geral, sendo um pouco mais alta entre janeiro e maio do que Bird Conservation International (2007) 17:367...

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Section: Discussionmentioning

confidence: 94%

Distribution patterns of diurnal raptors in open and forested habitats in south-eastern Brazil and the effects of urbanization

Eduardo¹,

Carvalho²,

Marini

2007

Bird Conservation International

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The Harvest of Rain–Forest Birds by Indigenous Communities in Panama*

Smith

2010

Geographical Review

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abstract. In this article I attempt to shed light on the relationships between indigenous communities and bird populations through research on hunting in five neighboring villages in western Panama. Over eight months, 59 households captured 1,584 birds using rifles, sling‐shots, traps, and other methods, resulting in a total yield of 252 kilograms. Although hunters captured more than 125 avian species, just four species account for more than half of the total harvest. The most important game bird is the great curassow (Crax rubra), followed by the great tinamou (Tinamus major) and crested guan (Penelope purpurascens). The type and quantity of avifauna captured varies significantly according to habitat and hunting strategy. The spatial distribution of bird kill sites is highly concentrated, with 62 percent of the harvest by weight captured within just 1 kilometer of the participating households. Even the more vulnerable species are encountered close to home, suggesting that overhunting has not occurred.

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Macaw abundance in relation to human population density in the western amazon basin

Cited by 2 publications

References 5 publications

Distribution patterns of diurnal raptors in open and forested habitats in south-eastern Brazil and the effects of urbanization

Distribution patterns of diurnal raptors in open and forested habitats in south-eastern Brazil and the effects of urbanization

The Harvest of Rain–Forest Birds by Indigenous Communities in Panama*

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