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- W2120147489 abstract "Abstract: Informally gathered species lists are a potential source of data for conservation biology, but most remain unused because of questions of reliability and statistical issues. We applied two alternative analytical methods (contingency tests and occupancy modeling) to a 35-year data set (1973–2007) to test hypotheses about local bird extinction. We compiled data from bird lists collected by expert amateurs and professional scientists in a 2-km2 fragment of lowland tropical forest in coastal Ecuador. We tested the effects of the following on local extinction: trophic level, sociality, foraging specialization, light tolerance, geographical range area, and biogeographic source. First we assessed extinction on the basis of the number of years in which a species was not detected on the site and used contingency tests with each factor to compare the frequency of expected and observed extinction events among different species categories. Then we defined four multiyear periods that reflected different stages of deforestation and isolation of the study site and used occupancy modeling to test extinction hypotheses singly and in combination. Both types of analyses supported the biogeographic source hypothesis and the species-range hypothesis as causes of extinction; however, occupancy modeling indicated the model incorporating all factors except foraging specialization best fit the data. Resumen: Las listas de especies recabadas informalmente son una fuente potencial de datos para la biología de la conservación, pero la mayoría no son utilizadas por cuestiones de confiabilidad y temas estadísticos. Aplicamos dos métodos analíticos alternativos (pruebas de contingencia y modelos de ocupación) a un conjunto de datos de 35 años (1973–2007) para probar hipótesis sobre la extinción local de aves. Recopilamos los datos de listas de aves recabadas por amateurs expertos y por científicos profesionales en un fragmento de 2 km2 de bosque tropical en la costa de Ecuador. Probamos los efectos de lo siguiente sobre la extinción local: nivel trófico, sociabilidad, especialización de forrajeo, tolerancia a la luz, rango geográfico y origen biogeográfico. Primero evaluamos la extinción con base en el número de años en que la especie no fue detectada en el sitio y utilizamos pruebas de contingencia con cada factor para comparar la frecuencia de eventos de extinción esperada y observada en las diferentes categorías de especies. Posteriormente, definimos cuatro períodos multianuales que reflejaron diferentes etapas de deforestación y aislamiento del sitio de estudio y utilizamos modelos de ocupación para probar las hipótesis de extinción individual y combinadamente. Ambos tipos de análisis apoyaron las hipótesis del origen biogeográfico y del rango geográfico como causas de extinción; sin embargo, los modelos de ocupación indicaron que el modelo que incorporó todos los factores, excepto la especialización de forrajeo, tuvo el mejor ajuste a los datos. Appendix S1 Please note: Wiley-Blackwell are not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing material) should be directed to the corresponding author for the article. 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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- W2120147489 date "2010-04-01" @default.
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- W2120147489 title "Testing Hypotheses of Bird Extinctions at Rio Palenque, Ecuador, with Informal Species Lists" @default.
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- W2120147489 doi "https://doi.org/10.1111/j.1523-1739.2009.01383.x" @default.
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