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Testing Hypotheses of Bird Extinctions at Rio Palenque,Ecuador, with Informal Species Lists
Authors:DAVID L. PEARSON  COREY DEVIN ANDERSON  BRIAN R. MITCHELL  MICHAEL S. ROSENBERG  RONALD NAVARRETE  PAUL COOPMANS
Affiliation:1. School of Life Sciences, Arizona State University, Tempe, AZ 85287‐4501, U.S.A., email dpearson@asu.edu;2. Center for Evolutionary Functional Genomics, The Biodesign Institute, P.O. Box 875301, Arizona State University, Tempe, AZ 85287‐5301, U.S.A.;3. Northeast Temperate Inventory and Monitoring Network, National Park Service, 54 Elm Street, Woodstock, VT 05091‐1023, U.S.A.;4. Fundación Wong, Av. Carlos Arosemena Km 2.5, Guayaquil, Ecuador;5. Mindo Cloud Forest Foundation, Condominio Fuente de Piedra 12, San Ignacio N30‐50, Quito, Ecuador;6. Deceased 1 January 2007.
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.
Keywords:bird community ecology  detectability  ecoinformatics  extinction  expert amateurs  occupancy modeling  professional biologists  species monitoring  tropical forest  amateurs expertos  bió  logos profesionales  bosque tropical  detectabilidad  ecoinformá  tica  ecologí  a de comunidades de aves  extinció  n  modelos de ocupació  n  monitoreo de especies
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