Download or read book Variation in Female Brooding Behavior in the Polymorphic White throated Sparrow Zonotrichia Albicollis written by Heidi L. Murray and published by . This book was released on 2006 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Corticosterone and Morph specific Variation in the Reproductive Behavior of the Polymorphic White throated Sparrow Zonotrichia Albicollis written by Brent Horton and published by . This book was released on 2007 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hormonal Mediation of a Unique Behavioral Polymorphism in the White throated Sparrow Zonotrichia Albicollis written by Meredith Bettencourt Swett and published by . This book was released on 2007 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this body of work, I examine how testosterone (T) physiology mediates the life-history trade-off between mating effort and parental care in the White-throated Sparrow. This species exhibits a behavioral polymorphism that occurs in both sexes. White-striped (WS) morphs are more territorially aggressive, sing more frequently and seek more extra-pair copulations. Tan-striped (TS) morphs provision nestlings more frequently. Thus this species roughly illustrates the trade-off between mating effort and parental care. I examine T physiology on three levels: plasma titres, binding globulins and response to the social environment. I ask whether levels of T correlate with morph-specific behavior and does this relationship change with stage in the nesting cycle. I found that WS males have significantly higher plasma levels of T than TS males. This difference is small, but it persisted through the parental stage of the nesting cycle. This suggests that T may mediate differences in mating effort and parental behavior in males, but is likely not the only factor. Female morphs did not differ in plasma T, thus T does not appear to play a similar role in females. Next I ask how corticosterone binding globulin (CBG) modulates T action. I found that CBG binds over 90% of T and is an important modulator of T action in this species. However CBG capacity did not differ between morphs, nor did morphs differ in baseline levels of corticosterone (CORT, a stress hormone that competes with T for binding sites on CBG.) Therefore interactions with CBG and CORT do not affect T action differently in the morphs, and patterns of free T (T not bound to CBG) mirror patterns of total T. Finally I investigated how T physiology responds to a change in the social environment- the establishment of a dominance relationship. WS males exhibited aggression more frequently and tended to dominate TS males. Levels of total T, CBG, CORT and free T were not predictive of future dominance status. Nor did these measures show persistent changes once the dominance relationship was established. The response of T physiology to the formation of a dominance relationship did not differ between morphs.

Download or read book Crown Plumage Variation in Zonotrichia Albicollis the White throated Sparrow written by Linda E. Donaldson Vardy and published by . This book was released on 1969 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Factors Influencing Sex Ratio Variation Within the Polymorphic White throated Sparrow written by Marisa L. Korody and published by . This book was released on 2006 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of sex ratio has recently become an area of intense study as it allows us to test many hypotheses and mathematical models that have been developed over the past 75 years. Advancement in molecular techniques has recently made the study of sex ratio in birds feasible. Understanding factors that influence sex ratio variation within birds will help with understanding environmental and selective pressures influencing these species. Through an intensive study of sex ratio in the polymorphic white-throated sparrow I show there are many interacting factors that are influencing sex ratio variation within this species. I integrate intensive field data with molecular techniques and Geographic Information System analysis to provide a comprehensive analysis of facultative sex ratio. The analysis includes the effects of parental condition, offspring condition, seasonal variation, and habitat quality on variation in sex ratio. My results show that white-throated sparrows are facultatively adjusting sex ratio based on condition and that there are variations within the pair types of this species based upon the level of parental investment.

Download or read book Impacts of Bloodborne Pathogen Infections on Breeding Ecology and Success in White throated Sparrows Zonotrichia Albicollis written by and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Bloodborne pathogens have significant and persistent impacts on avian populations worldwide, including decreased long-term survival and population size. Existing research indicates that chronic pathogen infections may have negative impacts on nesting success, such as decreased numbers of offspring, hatching probability, and fledging success. In species with multiple reproductive strategies, pathogen infections may have different impacts based on the role of the infected parent. White-throated Sparrows are a polymorphic species that mate disassortatively and display alternative reproductive strategies associated with color morph. White-striped birds are more aggressive, more promiscuous, and less parental than their tan- striped counterparts. I examined the reproductive outcomes of a population of White-throated Sparrows and investigated the factors that influenced variation in reproductive success within the population. I specifically focused on the influence of pathogen infection within the population and how infection interacts with the color morph of the infected parent. I found that bloodborne pathogen infection in white-striped, but not tan-striped, parents was associated with decreased nesting success. I also found an apparent association between pathogen infection in both parents and larger and heavier nestlings, which suggests a trade-off between prospective survival and reproductive effort."--Abstract.

Download or read book Alternative Reproductive Tactics written by Rui F. Oliveira and published by Cambridge University Press. This book was released on 2008-03-13 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of alternative reproductive tactics (the behavioural strategies used by individuals to increase their reproductive success) is an evolutionary puzzle, and one of great interest to researchers. For instance, why do some males guard both nest and eggs, while others sneak into nests while pairs are spawning and fertilise those eggs? The field offers a special opportunity to study the evolution and functional causes of phenotypic variation, which is a general problem in the field of evolutionary biology. By integrating both mechanistic (psychological) and evolutionary (behavioural ecology) perspectives and by covering a great diversity of species, Alternative Reproductive Tactics addresses this integrated topic of longstanding interest, bringing together a multitude of otherwise scattered information in an accessible form that is ideal for graduate students and researchers.

Download or read book Behavioural Biology Abstracts written by and published by . This book was released on 1983 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Territorial Behavior of White throated Sparrows Zonotrichia Albicollis with Special Emphasis on Song written by Frederick E. Wasserman and published by . This book was released on 1977 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Animal Behaviour Abstracts written by and published by . This book was released on 1983 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Buntings and Sparrows written by Clive Byers and published by A&C Black. This book was released on 2010-09-30 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first comprehensive guide to all the Old World buntings and North American sparrows. Buntings and North American sparrows offer a great identification challenge. Many of the long distance migrants are notable wanderers, with a strong tendency to vagrancy, while others are rare and local. Some of the Asian buntings and tropical sparrows are still poorly known, and the skulking habits of some species add to the challenge. Most male buntings acquire a bright plumage, but the American sparrows acquire this exceptionally, rather than as the rule. Many sparrows and female buntings appear to be rather dull brown birds, but a closer look will reveal intricate and often quite beautiful plumage; with these birds, the field marks that will enable positive identification are to be found in minute feather detail. This book includes 39 plates in full colour depicting all the species and distinct races. In the systematic section each species account is divided into sections: the identification section summarises important field marks; the description section details plumage and bare part characteristics for all ages and sexes; geographical variation covers taxonomy, and other sections give detailed measurements, descriptions of moult and ageing, habits, voice, status and habitat, distribution and movements, and references. A range map is included for each species. This beautifully presented book will for many years to come help solve the identification problems posed by a delightful and sought-after family of birds.

Download or read book The Condor written by and published by . This book was released on 1990 with total page 1154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Emu written by and published by . This book was released on 1995 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Current Ornithology Volume 17 written by Charles F. Thompson and published by Springer Science & Business Media. This book was released on 2010-09-09 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current Ornithology publishes authoritative, up-to-date, scholarly reviews of topics selected from the full range of current research in avian biology. Topics cover the spectrum from the molecular level of organization to population biology and community ecology. The series seeks especially to review (1) fields in which an abundant recent literature will benefit from synthesis and organization, or (2) newly emerging fields that are gaining recognition as the result of recent discoveries or shifts in perspective, or (3) fields in which students of vertebrates may benefit from comparisons of birds with other classes. All chapters are invited, and authors are chosen for their leadership in the subjects under review.

Download or read book Oxytocin Vasopressin and Related Peptides in the Regulation of Behavior written by Elena Choleris and published by Cambridge University Press. This book was released on 2013-04-11 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comparative overview of the effects of neuropeptides on behavior, examining parallel findings in both humans and non-human animals.

Download or read book Sparrows and Buntings written by Clive Byers and published by . This book was released on 1995 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The sparrows and buntings offer a great identification challenge. Many are long-distance migrants, while others are rare and local. Although most male buntings acquire a bright plumage, many sparrows fit the description of "little brown bird" very well. Still, a closer look reveals intricate and often quite beautiful plumage details that will enable positive identification." "This book is the first comprehensive guide to all the sparrows and buntings of North America, as well as the buntings of Europe, Asia, and Africa, 110 species in all. The detailed, authoritative descriptions include not only the birds' identifying features but their natural history as well. The 39 color plates depict all the plumages of every species and race described. A range map is included for each species. This beautiful book will help solve the tricky identification problems posed by a delightful and diverse family of birds."--BOOK JACKET.Title Summary field provided by Blackwell North America, Inc. All Rights Reserved