This dataset contains the digitized treatments in Plazi based on the original journal article Vallely, Andrew C., Ertl, Frederick, Garcia, Thierry (2023): The edge of the subtropics: a preliminary list of the birds of San José de Sumaco, Ecuador. Bulletin of the British Ornithologists’ Club 143 (4): 424-463, DOI: 10.25226/bboc.v143i4.2023.a3, URL: https://doi.org/10.25226/bboc.v143i4.2023.a3
SUMMARY.—We present the results of an eight-year avifaunal survey and review historical collections assembled by the Olalla family at San José de Sumaco, a humid-forested locality lying at c. 950 m elevation in the east Andean foothills of Orellana province, Ecuador. Notably high species richness is reported from a restricted area of upland terra firme forest, and our appendix lists 477 species considered documented, with conservation status according to IUCN, evidence and relative abundance. An additional 49 species have been reported from the site, but without documentation. Noteworthy records of 43 species are detailed, including poorly known, range-restricted taxa and those of conservation concern. Twenty-two species are regarded as either Near Threatened or Vulnerable by IUCN. Lowland (Amazonian) species dominate the avifauna, but it also includes a set of range-restricted, Andean species of which several are considered Near Threatened or Vulnerable at national or global scales (e.g., Napo Sabrewing Campylopterus villaviscensio, Fiery-throated Fruiteater Pipreola chlorolepidota, Ecuadorian Tyrannulet Phylloscartes gualaquizae). We report the presence of three obligate bamboo specialist species. We clarify the geographic position of the Olalla collecting locality San José de Sumaco using archival material and by reconstructing the collectors’ itinerary. We list noteworthy elevational records for 89 species of which 80 are upper-elevation records of lowland (Amazonian species). While mainly Amazonian, the avifauna is discussed in relation to its biogeography indicating historical connections to both Andean and Amazonian centres of diversification. We conclude that the lower slopes of Volcan Sumaco host a distinctive, species-rich avian assemblage that is threatened immediately by deforestation and potentially by climate change, and we stress its importance for conservation and continued study.
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