Geographic Variation of the Curve-Billed Thrasher (Toxostoma Curvirostre) Complex
نویسندگان
چکیده
منابع مشابه
Plasma corticosterone of city and desert Curve-billed Thrashers, Toxostoma curvirostre, in response to stress-related peptide administration.
We compared the activity and responsiveness of the hypothalamo-pituitary-adrenal (HPA) axis of an urban (Phoenix, Arizona) and desert population of a male songbird species (Curve-billed Thrasher, Toxostoma curvirostre), by measuring plasma corticosterone in response to acute administration of corticotropin-releasing factor, arginine vasotocin, or adrenocorticotropin hormone. Urban adult male th...
متن کاملBrain arginine vasotocin immunoreactivity differs between urban and desert curve-billed thrashers, Toxostoma curvirostre: relationships with territoriality and stress physiology.
The neuropeptide arginine vasotocin (AVT: the avian homolog of vasopressin) has numerous functional roles including mediating social behaviors, coregulating the adrenocortical stress response and maintaining water balance. These functions of AVT make it susceptible to environmental influence, yet little is understood concerning the variation in the AVT system across habitats. In this study, AVT...
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-We examined patterns of variation in skeletal morphometrics (29 characters), allozymes (34 loci), mitochondrial DNA (mtDNA) restriction sites (n = 74) and fragments (n = 395), and mtDNA sequences (1,739 bp from cytochrome b, ND2, ND6, and the control region) among all species of Toxostoma. The phenetic pattern of variation in skeletal morphometrics generally matched traditional taxonomic group...
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The populations of many species are declining worldwide, and conservation efforts struggle to keep pace with extinction rates. Conservation biologists commonly employ strategies such as translocation and reintroduction, which move individuals of endangered species from one part of their range to another. Because individuals from endangered populations are nonexpendable, identifying any potentia...
متن کاملInterspecific variation in avian blood parasites and haematology associated with urbanization in a desert habitat
Many avian species are negatively impacted by urbanization, but other species survive and prosper in urbanized areas. One factor potentially contributing to the success of some species in urban areas is the reduced presence of predators or parasite vectors in urban compared to rural areas. In addition, urban areas may provide increased food and water resources, which can enhance immune capacity...
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ژورنال
عنوان ژورنال: The Auk
سال: 2003
ISSN: 1938-4254,0004-8038
DOI: 10.1093/auk/120.2.311