| Publication Type: | Journal Article |
| Year of Publication: | 1990 |
| Authors: | Johnson, NK, Jones, RE |
| Journal: | The Wilson Bulletin |
| Volume: | 102 |
| Issue: | 2 |
| Date Published: | 1990 |
| ISBN Number: | 00435643 |
| Keywords: | Megascops, Megascops roboratus, Otus, Otus roboratus, Peru, Strigidae |
| Abstract: | Analysis of vocalizations of the dwarf form of screech-owl from northwestern coastal Perú establishes conspecificity with the Peruvian Screech-Owl (Otus roboratus) of the mid-Marañon Valley, a species previously considered to be monotypic. The small coastal form (O. r. pacificus) differs significantly from the nominate form in a series of characters of both size and color; some features do not overlap. Both subspecies of O. roboratus are polymorphic in color, with gray-brown and red phases represented. Alliance of O. r. roboratus with O. choliba and O. r. pacificus with O. guatemalae, as proposed by Hekstra, is not supported by either vocal features or plumage pattern. |
| URL: | http://www.jstor.org/stable/4162859 |
| Short Title: | The Wilson Bulletin |
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