| interspecific variability of prevalence in blood parasites of adult passerine birds during the breeding season in alaska. | blood parasite prevalence based on microscopic examination of stained blood smears was determined in adults of 11 passerine bird species sampled during their breeding season (may and june 1997-98) in interior alaska (usa). these species included primarily nearctic migratory species such as the dark-eyed junco (junco hyemalis) and neotropical migratory species such as the blackpoll warbler (dendroica striata), alder flycatcher (empidonax alnorum), swainson's thrush (catharus ustulatus), northern ... | 2001 | 11272501 |
| ongoing movement of the hermit warbler x townsend's warbler hybrid zone. | movements of hybrid zones - areas of overlap and interbreeding between species - are difficult to document empirically. this is true because moving hybrid zones are expected to be rare, and because movement may proceed too slowly to be measured directly. townsend's warblers (dendroica townsendi) hybridize with hermit warblers (d. occidentalis) where their ranges overlap in washington and oregon. previous morphological, behavioral, and genetic studies of this hybrid zone suggest that it has been ... | 2010 | 21152406 |