Conservation implications of a limited avian cross-habitat spillover in pasture lands

Autor(es)

Boesing, Andrea Larissa ^[1] ; Marques, Thiago Simon ^[2] ; Martinelli, Luiz Antonio ^[3] ; Nichols, Elizabeth ^[1] ; Siqueira, Paulo Ricardo ^[4] ; Beier, Christian ^[5] ; de Camargo, Plinio Barbosa ^[3] ; Metzger, Jean Paul ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Ecol, Rua Matao 321, Travessa 14, BR-05508900 Sao Paulo, SP - Brazil

^[2] Univ Sorocaba, Ctr Environm Studies, Rodovia Raposo Tavares Km 92 A 100, BR-18023000 Sorocaba, SP - Brazil

^[3] Univ Sao Paulo, Ctr Nucl Energy Agr, Ave Centenario 303, BR-13416000 Piracicaba, SP - Brazil

^[4] Univ Minas Gerais, Dept Gen Biol, Ave Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG - Brazil

^[5] Pontificia Univ Catolica Rio Grande do Sul, Programa Posgrad Ecol & Evolucho Biodiversidade, Museu Ciencias & Tecnol, Lab Ornitol, Ave Ipiranga 6681, BR-90619900 Porto Alegre, RS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Biological Conservation; v. 253, JAN 2021.
• Citações Web of Science: 2

Resumo

Increasing evidence demonstrates a role for the cross-habitat spillover process in the maintenance of biodiversity in managed agricultural landscapes. However, the mechanisms that drive this process are less well understood. In particular, it is critical to know how landscape structure modulates spillover movements, and whether species are moving through the matrix to acquire resources or simply to disperse between habitat fragments. We tested landscape effects and food resource use within cattle pasture matrices. We used mist-nets to collect data on avian communities across 51 sampling sites, spanning a forest cover gradient. We additionally integrated stable isotopic analysis (delta C-13 signature) to determine the provenance of resources used (either forest - dominated by C-3 plants; or pasture, dominated by C-4). Bird movement across pasture matrices was extremely reduced, and bird occupation was concentrated near forest edges. There was a clear distinction of resource use according to species' habitat preferences, with forest-species foraging predominantly in-forests, open-area species in pastures, and generalist species having more varied diets, but still relying on a large proportion of C-3 sources. Forest cover was unrelated to avian spillover from forests into pastures, but positively related to C-3 signatures for both forest and open-area associated species. Finally, we found that most birds moving from forests to pastures were habitat generalists (63%), and that pastures work as a barrier for forest-associated species movement. Landscapes dominated by pasture are very unfavorable to the conservation of forest species, but potentially can maintain ecosystem services from the spillover of generalist species. (AU)

• Processo FAPESP: 13/23457-6 - Projeto interface: relações entre estrutura da paisagem, processos ecológicos, biodiversidade e serviços ecossistêmicos
• Beneficiário: Jean Paul Walter Metzger
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 13/11032-0 - Ecologia trófica de mamíferos em ambientes antrópicos por meio da metodologia de isótopos estáveis
• Beneficiário: Thiago Simon Marques
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/26093-6 - Spillover de aves para cafezais e implicações para o controle de pragas
• Beneficiário: Andrea Larissa Boesing
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/13802-4 - Integrando ecologia do movimento em na ciência dos serviços ecossistêmicos
• Beneficiário: Andrea Larissa Boesing
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 13/12777-0 - Influência da composição da paisagem e da diversidade funcional e filogenética das comunidades de aves na provisão do serviço de regulação de pragas agrícolas
• Beneficiário: Andrea Larissa Boesing
• Modalidade de apoio: Bolsas no Brasil - Doutorado