American Redstarts breeding in Hubbard Brook Experimental Forest (New Hampshire) are indifferent to sugar maple but they prefer yellow birch (Betula allegheniensis) (Holmes and Robinson, 1981).
We estimated tree preferences each year for the four most abundant species that had at least 30 observations each year: Yellow-rumped Warbler, American Redstart (Setophaga ruticilla), Warbling Vireo (Vireo gilvus), and Baltimore Oriole (Icterus galbula).
Nine species that breed locally, with some unknown proportion still in transit, comprised 1113 observations: American Redstart, Warbling Vireo, Baltimore Oriole, Bluegray Gnatcatcher, Yellow Warbler, Prothonotary Warbler, Red-eyed Vireo (Vireo olivaceus), Rose-breasted Grosbeak (Pheucticus ludovicianus), and Yellow-throated Vireo (Vireoflavifrons) (Table 5).
Neighboring American Redstarts tend to converge on a single first-category song for the breeding season (Lemon and others 1975).
Song repertoires and song sharing by American Redstart. Condor 87:457-470.
"American redstarts were a perfect species for this study since they defend exclusive territories throughout the non-breeding period until they depart for spring migration and most return back to the same territory the following year," said Pete Marra, research ecologist at the Smithsonian Conservation Biology Institute's Migratory Bird Center.
"Because American redstarts return to the same site to breed each year, arriving later may make it harder for them remain to remain in synch with their breeding cycle," Studds said.
Delayed plumage maturation and the presumed prealternate molt in American Redstarts. Wilson Bulletin 95:199-208.
Population fluctuations in a long-distance Neotropical migrant: demographic evidence for the importance of breeding season events in the American Redstart. Pages 431-442 in J.
In Jamaica, estimates of absolute abundances of American Redstarts (Setophaga ruticilla) differed more than threefold among four habitats studied, ranging from 17 to 56 individuals/10 ha [ILLUSTRATION FOR FIGURE 1 OMITTED].
In Jamaica, American Redstarts and Black-throated Blue Warblers defend small areas using stereotyped postures and vocalizations, reside on the same area throughout the winter, return to the same site in subsequent years, and respond aggressively to playbacks of vocalizations comprised of mixed song and chip call notes; individuals tend to be relatively evenly dispersed within habitats (Holmes et al.
Sherry of Tulane University in New Orleans studied a population of American redstarts
(Setophaga ruticilla) that summer in New Hampshire's White Mountains and winter in Jamaica.
During the spring and summer, Holmes and Sherry direct a long-running and multifaceted study of the population dynamics of American redstarts and black-throated blue warblers that nest in New Hampshire.
In autumn, black-throated blue warblers migrate to the Greater Antilles, and American redstarts scatter to Mexico and the Caribbean islands and south to Venezuela.