Spizella

The thyroid and photoperiodic control of seasonal reproduction in American tree sparrows (Spizella arborea).

Brewer's (Spizella 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 [34].

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 passerine).

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.