The thyroid and photoperiodic control of seasonal reproduction in American tree sparrows (Spizella
Thirteen supposedly new species of birds from northern Mesoamerica described by Du Bus (1845-46, 1847a-b), four valid taxa assigned to Bonaparte (1850) upon an unfinished manuscript by the former, a junior synonym of the White-crowned Sparrow Zonotrichia leucophrys (Spizella
maxima Bonaparte, 1853), and Cyanocitta [Cyanocorax] yucantanica Dubois, 1875 are partly devoid of collecting data as noted by van Rossem (1940: "no locality [...] nor [...] original source either in the register or on the stand") in context with the male holotype of Pipilo torquatus ("No.
breweri) and sagebrush (Artemisiospiza nevadensis) sparrows are obligate to landscapes dominated by sagebrush (Artemisia species) on their breeding range (Martin and Carlson, 1998; Rotenberry et al., 1999).
These Fragstats and compositional metrics were chosen post hoc based on characteristics of habitat use of the species (American tree sparrow Spizella
arborea and white-crowned sparrow Zonotrichia leucophrys) included in our post hoc analyses (Norment 1993, King and Savidge 1995, Delisle and Savidge 1997, Hovick et al.
In this context, several studies showed the inhibiting effect of the short days on the sexual maturity in many birds, including sparrow of trees (Spizella
arborea), and curdle (Couturnix couturnix japonica), which undergo a total regression in their testes during the 18th weeks of experiment .
Nelson, Field Sparrow (Spizella
Pusilla), The Birds of North America Online, edited by A.
The Chipping Sparrow (Spizella
passerina) is a common breeding bird in upstate New York, but departs the region in the fall and rarely occurs in winter.
Avian diversity was higher in the two treatment areas due to an increase in species associated with open habitats including field sparrow (Spizella
pusilla) and indigo bunting (Passerina cyanea).
For example, patches embedded in pine plantations had higher numbers of the sometimes conifer-associated yellow-throated warbler, northern parula, and chipping sparrow (Spizella
For instance, most nests found on the State Game Lands (SGL) 33 ROW in 1991-92 were those of early successional species, including field sparrow (Spizella
pusilla), gray catbird (Dumetella carolinensis), eastern towhee (Pipilo erythrophthalmus), common yellowthroat (Geothlypis trichas), and indigo bunting (Passerina cyanea) (Bramble et al.
American Tree Sparrow (Spizella
arborea): Has red-brown cap and a dark spot on its breast.