| stable isotopes as indicators of altitudinal distributions and movements in an ecuadorean hummingbird community. | altitudinal migration and dispersal is an important component of the life history of several temperate and tropical birds but remains poorly understood due to the limited success of mark and recapture techniques. stable isotopes of hydrogen (deltad) in rainfall, and to a lesser extent, carbon (delta13c) in plants are known to change with altitude and hence may provide the basis of a technique for tracking the altitudinal movements in birds and other wildlife. we investigated the potential for th ... | 2003 | 12756525 |
| the role of geography and ecology in shaping the phylogeography of the speckled hummingbird (adelomyia melanogenys) in ecuador. | the andes of south america contain one of the richest avifaunas in the world, but little is known about how this diversity arises and is maintained. variation in mitochondrial dna and morphology within the speckled hummingbird (adelomyia melanogenys) was used to elucidate the phylogeographic pattern along an ecuadorian elevational gradient, from the coastal cordillera to the inland andean montane region. we examined sequence, climatic/remote sensing and morphological data to understand the effec ... | 2007 | 17208464 |
| high-frequency vocalizations in andean hummingbirds. | hummingbirds possess a number of unique features. a recent report in current biology[1] showed that the black jacobin (florisuga fusca), a brazilian hummingbird in the topazes clade, produces high-frequency vocalizations outside the known hearing range of birds. here, we report that four hummingbird species in the andean clade [2,3] also exhibit high-frequency vocalizations: the ecuadorian hillstar (oreotrochilus chimborazo), with the highest fundamental frequency (mean f0 = 13.4 khz), the buff- ... | 2018 | 30205060 |