Taxonomic Status of the Streaked Saltator, Saltator striatipectus (Passeriformes: Thraupidae), from Puná Island, Ecuador.

The Streaked Saltator, Saltator striatipectus, is an uncommon to common resident of open areas, cultivated land, gardens, and forest edges, with ten subspecies recognized from west Costa Rica through west Peru (Brewer 2016). Patterns of plumage variation, especially mantle color and streaking pattern below, are complex across subspecies and age classes (Chapman 1926; Ridgely Tudor 2009; Brewer 2016). Until recently, S. striatipectus was considered conspecific with the Lesser Antillean Saltator S. albicollis, but separated on the basis of genetic differentiation despite overall plumage similarities (Seutin et al. 1993). Actually, S. striatipectus and S. albicollis are not each other's closest relatives (Chaves et al. 2013).

Testing hypotheses of bird extinctions at Rio Palenque, Ecuador, with informal species lists.

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-km(2) 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.