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Blog da Falco - Aves Neotropicais - EasyBlog

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Sazonalidade e tipos de hábitats afeta atropelamentos de aves neotropicais

Rosa--Bager-2012-Birds1.pdf

 

Autores: Clarissa Alves da Rosa & Alex Bager 2012

Universidade Federal de Lavras, Setor de Ecologia

 

Os atropelamentos são um dos mais significativos impactos a biodiversidade, embora o conhecimento acerca dos fatores que influenciam o atropelamento de aves neotropicais ainda seja incipiente. O objetivo do estudo foi avaliar diferenças na riqueza de espécies atropeladas e taxa de atropelamento de aves neotropicais em função da estação do ano e tipos de habitat associados a rodovia.

Os dados foram coletados ao longo de duas rodovias federais no região Sul do Brasil. Nós identificamos 57 espécies atropeladas, com uma taxa de atropelamento de 0,06 indivíduos/km/dia (Min. ¼ 0.009; Max.¼ 0.47). Nossos resultados demonstram que a riqueza e a taxa de atropelamento se alteram de acordo com a sazonalidade e os tipos de habitat.

Os atropelamentos se concentraram em áreas de plantio de arroz e áreas alagadas, elevando a riqueza de espécies e a taxa de atropelamento durante o verão e o outono. As áreas no entorno apresentam uma taxa de atropelamento semelhante, independentemente do tipo de habitat. Isto ocorre provavelmente devido ao deslocamento de diversas espécies em busca de alimento e abrigo.

Fatores como a dispersão dos indivíduos juvenis, o período de colheita e transporte de grãos, comportamentos específicos de voo e forrageamento, parecem estar relacionados às crescentes ocorrências de atropelamentos e riqueza de espécies mais abundantes.

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