BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.
The use of mist nets is a highly used method among researchers due to their efficiency in capture birds and bats. However, trapped animals are vulnerable to predator action. During three ornithological studies carried out in a forest fragment from southwest Amazonia, we recorded 15 predation events, with predation rate of 1.5%. Among predators, 26.7% (n = 4) of the cases were related to primates, 13.3% (n = 2) related to army ants, 13.3% (n = 2) related to an unidentified hawk species and in 46.7% (n = 7) of the cases the predators did not identified. Preventing predator access to mist nets and reducing network monitoring time are some of the measures that can prevent these events.
BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.
We present the first records of the Wing-barred Seedeater (Sporophila americana)in Acre, Brazil. These observations, together with the published records and the specimens housed in museum collections, indicate that S. americana occurs over a considerably larger geographical area than is currently presented in the relevant literature. The occurrence of S. americana in the region of São Paulo de Olivença, in the Brazilian state of Amazonas indicates the potential existence of a sympatric zone with the congener Caqueta Seedeater (Sporophila murallae) in the western Amazonia.
Avaliamos como a conversão de floresta para pasto interfere na estrutura das assembleias de aves no sudoeste da Amazônia brasileira. Capturamos as aves no período de 16 a 18 de novembro de 2017. Utilizamos 10 redes de neblina instaladas em linha contínua no interior da floresta e 10 redes em um enclave de pastagem adjacente. Com esforço amostral de 300 horas/m², capturamos 122 indivíduos distribuídos em 31 espécies de aves. No ambiente de floresta foram capturadas 23 espécies (74,2%), e no ambiente de pastagem foram oito espécies (25,8%). A curva de rarefação indicou que o ambiente de floresta possui mais espécies do que o amostrado e uma tendência à estabilização para o ambiente de pastagem. As aves com maior percentual de captura no ambiente de floresta foram o rendadinho (Willisornis poecilinotus) e o uirapuru-de-garganta-preta (Thamnomanes ardesiacus), enquanto que no ambiente de pastagem foi o tiziu (Volatinia jacarina). Os perfis de diversidade, guildas alimentares e morfometria revelaram diferenças significativas entre os ambientes de floresta e pastagem. Os resultados indicaram uma perca significativa de diversidade e de funções ecológicas no ambiente de pastagem. As alterações ambientais transformando florestas biodiversas em pastagens afetam a diversidade de aves colocando em risco a sobrevivência de espécies endêmicas e/ou raras dependentes de ambientes florestais no sudoeste da Amazônia.
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