Two New Late Pleistocene Avifaunas from New Mexico / Dos Avifaunus del Pleistoceno Tardío de Nuevo México

We report two new late Pleistocene avifaunas from New Mexico, recovered from Sandia Cave during archaeological excavations by F. Hibben in the 1930s and the nearby Marmot Cave excavated in 2000. The fossil assemblage from Sandia Cave consists of at least 30 taxa, including seven extralimital and two extinct species, Coragyps occidentalis (extinct vulture) and Ectopistes migratorius (Passenger Pigeon). The avifauna from Marmot Cave is limited to eight taxa shared with Sandia Cave. Two new records of Gymnogyps californianus (California Condor) are reported from these sites, as well as new records of hagopus sp. (ptarmigan), Aegolius funereus (Boreal Owl), and Micrathene whitneyi (Elf Owl) from New Mexico. Two new radiocarbon dates on fossil G. californianus from Sandia and Marmot cave are reported at$10 795 \pm 50$and$25 090 \pm 220 ^{14}C$years before present (B.P.), respectively. These collections provide further evidence for mixed avian communities in New Mexico during the late Pleistocene and are similar to other cave avifaunas of comparable age from the Great Basin and Rocky Mountain regions. The birds from Sandia Cave that are shared with other fossil avifaunas include species currently found in arctic tundra, boreal, and steppe habitats, as well as open, xeric communities. This collection provides additional evidence for widespread steppe-tundra, shrub, and subalpine forest environments at lower elevations of western North America during the late Pleistocene. /// Se reportan dos nuevas avifaunas del Pleistoceno tardío de Nuevo México, encontradas en Cueva$Sand\acute{i}a$durante excavaciones$arqueol\acute{o}gicas$dirigidas por F. Hibben en la$d\acute{e}cada$de 1930 y en Cueva Marmota durante excavaciones realizadas en el$a\tilde{n}o$2000. La asamblea$f\acute{o}sil$de Cueva$Sand\acute{i}a$consiste de al menos 30 taxa, incluyendo siete especies localmente desaparecidas y dos extintas, Coragyps occidentalis y Ectopistes migratorius. La avifauna de Cueva Marmota se limita a pertenecientes a ocho taxa encontrados$tambi\acute{e}n$en Cueva$Sand\acute{i}a$. Dos registros nuevos de Gymnogyps californianus se reportan en estos sitios, así como registros nuevos de Lagopus sp., Aegolius funereus y Micrathene whitneyi para Nuevo México. Dos nuevos análisis de radiocarbono del$f\acute{o}sil$G. californianus de las Cuevas$Sand\acute{i}a$y Marmota arrojaron una$antig\ddot{u}edad$de$10 795 \pm 50$and$25 090 \pm 220 ^{14}C$años antes del presente, respectivamente.