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• W2888833613 abstract "The ratio of juvenile to adult birds in mist-net samples is used to monitor avian productivity, but whether it is a “true” estimate of per capita productivity or an index proportional to productivity depends on whether capture probability is not age-dependent (true estimate) or age difference in capture probability is consistent among years (index). Better understanding of the processes affecting age- and year-specific capture probabilities is needed to advance the application of constant-effort mist-netting for monitoring and conservation, particularly in many tropical settings where capture rates are often low. We ranked members of the avian community by capture frequencies, determined if temporary emigration influenced the availability of birds to be captured, and assessed the distribution of birds relative to mist-nets and the parity between capture-based productivity estimates and number of fledglings in nest plots in a tropical dry forest in Puerto Rico in 2009 and 2010. Few captures characterized the community of 25 resident species and, when estimable, capture probabilities were low, particularly for juveniles (typically < 0.1). Negative trends in capture probability, temporary emigration, and the distribution of birds suggest that avoidance of mist-nets influenced capture rates in our study. Increasing mist-net coverage or moving mist-nets between sampling periods could increase capture rates. The number of fledglings observed in nest plots (25 ha/plot) did not correlate well with capture-derived estimates (20 ha/net stations), suggesting the presence of immigrants or failure to find all nests. Our results suggest that indices of breeding productivity from mist-netting data may track temporal changes in productivity, but such data likely do not reflect “true” productivity in most cases unless age-specific differences in capture probability are incorporated into estimates. Pilot studies should be conducted to evaluate capture rates and the spatial extent sampled by mist-nets to improve sampling design and inferences before informing decisions. La proporcion de juveniles a adultos atrapados en redes de niebla son usados para monitorear la productividad de aves, pero si el estimado es “verdadero” o es un índice proporcional a la productividad depende de que la probabilidad de captura no sea dependiente de la edad (estimado verdadero) o que la diferencia en captura por edad sea consistentemente proporcional entre años (índice). Se necesita un mejor entendimiento de los procesos que afectan probabilidades de captura por edad y año para adelantar la aplicación de esfuerzo-constante de redes de niebla para monitorear y conservación, particularmente en ambientes tropicales donde la tasas de captura son bajas. Nosotros ordenamos miembros de la comunidad de aves por frecuencia de capturas, determinamos si emigración temporal influenció la disponibilidad de aves a ser capturadas, y evaluamos la distribución de las aves relativo a las redes de niebla y la paridad entre estimados de productividad a base de capturas y numero de volantones en parcelas con nidos en un bosque tropical seco en Puerto Rico en 2009 y 2010. Pocas capturas caracterizó la comunidad de 25 especies de aves, y cuando se estimaron, la probabilidades de captura fueron bajas, particularmente para juveniles (típicamente < 0.01). Tendencias negativas en probabilidad de captura, emigración temporal, y la distribución de aves sugirió que las mismas eluden las redes de niebla influenciando las tasas de captura. Ampliar la cobertura o mover las redes de niebla entre periodos de muestreo puede aumentar tasas de captura. Los volantones observados en parcelas de anidamiento (25 ha/parcela) no correlacionaron bien con los estimados derivados de captura (20 ha/estación de redes), apuntando a la presencia de inmigrantes o fallo de encontrar todos los nidos. Nuestros hallazgos sugieren que los índices de productividad reproductiva de redes de nieblas pueden rastrear cambios temporales en productividad, pero esos datos probablemente no reflejan “verdadera” productividad en la mayoría de los casos a menos que las diferencias en probabilidad de captura por edad se usen para ajustar los estimados. Estudios pilotos deben llevarse a cabo para evaluar tasas de captura y el ámbito espacial muestreado por redes de niebla para mejorar el diseño de muestreo e inferencias antes de informar decisiones. Table S1. Goodness-of-fit tests for robust design models for Puerto Rican Bullfinches (Loxigilla portoricensis), Bananaquits (Coereba flaveola), and Adelaide's Warblers (Setophaga adelaide) captured at Guánica State Forest in southwestern Puerto Rico, 2009–2010. Table S2. Model selection tables for Puerto Rican Bullfinches (Loxigilla portoricensis) captured at Guánica State Forest in southwestern Puerto Rico, 2009–2010. Table S3. Model selection tables for Bananquits (Coereba flaveola) captured at Guánica State Forest in southwestern Puerto Rico, 2009–2010. Table S4. Model selection tables for Adelaide's Warblers (Setophaga adelaide) captured at Guánica State Forest in southwestern Puerto Rico, 2009–2010. Fig. S1. Map showing estimated locations and the weighted bivariate ellipse for radio-tracked Bananaquits (Coereba flaveola) in the western tract of the Guanica Dry Forest in Puerto Rico. Fig. S2. Map showing estimated locations and the weighted bivariate ellipse for radio-tracked Adelaide's Warblers (Setophaga adelaides) in the western tract of the Guanica Dry Forest in Puerto Rico. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article." @default.
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• W2888833613 date "2018-08-26" @default.
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• W2888833613 title "Improving our understanding of demographic monitoring: avian breeding productivity in a tropical dry forest" @default.
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