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Home-range and movements of Myrmeciza exsul (aves: thamnophilidae) in two fragmented landscapes in Costa Rica: evaluating functional connectivity

by Losada Prado, Sergio; CATIE, Turrialba (Costa Rica).
Publisher: Turrialba (Costa Rica) : 2012Description: 122 p. : ; +.Subject(s): PAJAROS | TIERRAS AGRICOLAS | PAISAJE | COSTA RICAOnline Resources: Texto completo (En) | En Summary: It is well known that fragmentation not only reduces the total amount of habitat available, but also simultaneously isolates the habitat that remains, preventing movement of organisms and processes in previously connected landscapes. Home-range sizes, movements, density, and apparent survival for individual species remains almost entirely unknown for Neotropical birds especially in fragmented landscapes. Likewise, effects of the agricultural matrix on these variables have been little studied and this information is required for conservation planning. We estimated home-range sizes, movements, density, and apparent survival of Chestnut-backed Antibird (Myrmeciza exsul), an understory insectivorous bird with limited dispersalSummary: through several methods (telemetry, color-marked individuals, capture-recapture, and observations). We studied two fragmented landscapes in southwestern Costa Rica: Los Cusingos Landscapes (LCL) with a 56% of forest area and Boruca Landscape (BOL) with only 31% of forest area. Each one with different agricultural matrices, thus LCL with sun-grown coffee, shaded coffee, whereas BOL with degraded pastures. Finally, we considered that M. exsul populations are stable by strategies as territoriality and parental care during post-fledging period which are potential factors influencing the evolution of small clutch sizes in tropical birds.
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Tesis (Ph. D.)

It is well known that fragmentation not only reduces the total amount of habitat available, but also simultaneously isolates the habitat that remains, preventing movement of organisms and processes in previously connected landscapes. Home-range sizes, movements, density, and apparent survival for individual species remains almost entirely unknown for Neotropical birds especially in fragmented landscapes. Likewise, effects of the agricultural matrix on these variables have been little studied and this information is required for conservation planning. We estimated home-range sizes, movements, density, and apparent survival of Chestnut-backed Antibird (Myrmeciza exsul), an understory insectivorous bird with limited dispersal

through several methods (telemetry, color-marked individuals, capture-recapture, and observations). We studied two fragmented landscapes in southwestern Costa Rica: Los Cusingos Landscapes (LCL) with a 56% of forest area and Boruca Landscape (BOL) with only 31% of forest area. Each one with different agricultural matrices, thus LCL with sun-grown coffee, shaded coffee, whereas BOL with degraded pastures. Finally, we considered that M. exsul populations are stable by strategies as territoriality and parental care during post-fledging period which are potential factors influencing the evolution of small clutch sizes in tropical birds.

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