Comprobación de hipótesis sobre las extinciones de aves en río palenque, ecuador mediante listas informales de especies

Translated title of the contribution: Testing hypotheses of bird extinctions at rio palenque, ecuador, with informal species lists

David L. Pearson, Corey Devin Anderson, Brian R. Mitchell, Michael S. Rosenberg, Ronald Navarrete, Paul Coopmans

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


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.

Translated title of the contributionTesting hypotheses of bird extinctions at rio palenque, ecuador, with informal species lists
Original languageSpanish
Pages (from-to)500-510
Number of pages11
JournalConservation Biology
Issue number2
StatePublished - Apr 2010


  • Bird community ecology
  • Detectability
  • Ecoinformatics
  • Expert amateurs
  • Extinction
  • Occupancy modeling
  • Professional biologists
  • Species monitoring
  • Tropical forest

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Nature and Landscape Conservation


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