Non-breeding Nazca Boobies (Sula Granti) Show Social and Sexual Interest in Chicks
Author: Elaine T. Porter
Publisher:
Published: 2003
Total Pages: 234
ISBN-13:
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Author: Elaine T. Porter
Publisher:
Published: 2003
Total Pages: 234
ISBN-13:
DOWNLOAD EBOOKAuthor: Victor S. Lamoureux
Publisher: CRC Press
Published: 2016-04-19
Total Pages: 307
ISBN-13: 1466562099
DOWNLOAD EBOOKThis title includes a number of Open Access chapters. This comprehensive volume looks at a range of topics covering the habits of a variety of animals, including how macaques teach their offspring, how rats transmit avoidance behavior, how supplementary feeding of tree frogs affects their breeding behavior, and more. Studies in animal behavior can
Author: Victor Apanius
Publisher: Univ of California Press
Published: 2008
Total Pages: 56
ISBN-13: 094361080X
DOWNLOAD EBOOKAuthor: Adam Nicolson
Publisher: Henry Holt
Published: 2018-02-06
Total Pages: 419
ISBN-13: 1250134188
DOWNLOAD EBOOKOriginally published in The U.K. in 2017 by HarperCollins.
Author: Sybil L. Hart
Publisher: John Wiley & Sons
Published: 2013-04-03
Total Pages: 732
ISBN-13: 1118702409
DOWNLOAD EBOOKThrough a compilation of original articles, the Handbook of Jealousy offers an integrated portrait of the emerging areas of research into the nature of jealousy and a forum for discussing the implications of the findings for theories of emotional and socio-cognitive development. Presents the most recent findings and theories on jealousy across a range of contexts and age-stages of development Includes 23 original articles with empirical findings and detailed commentaries by leading experts in the field Serves as a valuable resource for professionals in the fields of clinical psychology, psychiatry, and social work, as well as scholars in the fields of psychology, family studies, sociology, and anthropology
Author: Terri J. Maness
Publisher:
Published: 2008
Total Pages: 159
ISBN-13:
DOWNLOAD EBOOKNazca boobies are socially and genetically monogamous, long-lived pelagic seabirds with bi-parental care and similar parental roles. A large colony on the island of Española, Galápagos has been the focus of long-term reproductive and demographic studies. The adult sex ratio at this colony has been significantly male biased for more than twenty years. Knowledge of the ontogeny of this bias provides critical context that allows proper framing of hypotheses regarding parental sex allocation, the relative reproductive value of sons and daughters, mating systems, individual fitness and endangered species management. Nazca booby parents might adaptively alter the sex of their offspring according to current environmental or demographic conditions, or sex-specific mortality may occur in poor food years. Genetic sex determination of nestlings and fledglings showed that these processes could not account for the male-biased adult sex ratio in this population. Instead, the sex ratio bias arose after the period of parental care ended, during the juvenile/subadult stage between fledging and return to the colony. The deficit of female recruits is apparently a consequence of sex-specific post-fledging mortality. This finding has important implications for mate competition. The proportional representation of males among the adults ready to mate in a population at a given moment is a central concept in explaining variation in sex roles, the intensity of mating competition, and mate choice. Given the extensive period (approximately six months) of parental care in Nazca boobies, both males and females should benefit from choosiness in mate selection. The sex ratio bias in this population should allow females to choose the best available partner from a pool of potential mates. Behavioral observations and analysis of long-term mating patterns revealed that divorce was more common in this population than is typically expected for monogamous seabirds. Costs of reproduction provided a basis for females to adaptively switch mates, replacing a temporarily depleted male for a current non-breeder in better condition. Behavioral observations revealed that mate choice and divorce were driven primarily by female choice. Females appeared to use several long-term indicators of health and nutritional status to distinguish among potential mates. Males selected as mates were in better body condition, had lower circulating immunoglobulin G levels, and, as a group, had lower variance in serum albumin concentration than did unselected males. This body of work included the most complete documentation of the ontogeny of the sex ratio across the lifespan for any wild bird species, provided evidence for a previously undescribed mating system, uniquely investigated the behavior of mated pairs and non-breeding adults prior to divorce, and was the first study to examine the morphological and hematological parameters of individuals during the process of mate selection in a wild population.
Author: Bryan Nelson
Publisher: Oxford University Press, USA
Published: 1978
Total Pages: 1056
ISBN-13:
DOWNLOAD EBOOKAuthor: R. W. Furness
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 210
ISBN-13: 1461320933
DOWNLOAD EBOOKIn the last few years there has been an excltmg upsurge in seabird research. There are several reasons for this. Man's increased ex ploitation of natural resources has led to a greater awareness of the potential conflicts with seabirds, and of the use of seabirds to indicate the damage we might be doing to our environment. Many seabird populations have increased dramatically in numbers and so seem more likely to conflict with man, for example through competition for food or transmission of diseases. Oil exploration and production has resulted in major studies of seabird distributions and ecology in relation to oil pollution. The possibility that seabirds may provide information on fish stock biology is now being critically investigated. Some seabird species have suffered serious declines in numbers and require conservation action to be taken to reduce the chances that they will become extinct. This requires an understanding of the factors determining their population size and dynamics.
Author: Judith Denkinger
Publisher: Springer Science & Business Media
Published: 2014-01-24
Total Pages: 322
ISBN-13: 3319027697
DOWNLOAD EBOOKThis book focuses on how marine systems respond to natural and anthropogenic perturbations (ENSO, overfishing, pollution, tourism, invasive species, climate-change). Authors explain in their chapters how this information can guide management and conservation actions to help orient and better manage, restore and sustain the ecosystems services and goods that are derived from the ocean, while considering the complex issues that affect the delicate nature of the Islands. This book will contribute to a new understanding of the Galapagos Islands and marine ecosystems.
Author: S. A. L. M. Kooijman
Publisher: Cambridge University Press
Published: 2010
Total Pages: 533
ISBN-13: 052113191X
DOWNLOAD EBOOKThe Dynamic Energy Budget theory unifies the commonalities between organisms and links different levels of biological organisation.