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Author: Victor Apanius
Publisher: Univ of California Press
ISBN: 094361080X
Category : Nature
Languages : en
Pages : 56
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Book Description
Author: Victor Apanius
Publisher: Univ of California Press
ISBN: 094361080X
Category : Nature
Languages : en
Pages : 56
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Book Description
Author: Terri J. Maness
Publisher: Frontiers Media SA
ISBN: 2832549470
Category : Science
Languages : en
Pages : 122
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Book Description
One of the great challenges in ecophysiology is linking physiological measures in wild animal populations with changes in individual fitness. Physiological variables that indicate nutritional state, stress, disease, or injury are used extensively in veterinary practice and captive settings to assess the health and likelihood of reproductive success of many animals. The development and refinement of sampling methods that limit disturbance of animals, coupled with advancements in analytical methods have allowed researchers to begin to examine the relevance of these physiological parameters in wild animals for predicting population trends and response to environmental perturbations. However, despite extensive research in this field, consistent correlations between fitness and/or population health and physiological measures remain rare.
Author: Victor S. Lamoureux
Publisher: CRC Press
ISBN: 1466562099
Category : Medical
Languages : en
Pages : 307
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Book Description
This 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: Kevin Winker
Publisher: Univ of California Press
ISBN: 0943610885
Category : Nature
Languages : en
Pages : 40
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Book Description
Differentiation and speciation without extended isolation appear to be common among migratory animals. Historical oversight of this is probably due to temporal distortion in distribution maps and a tendency to consider that lineages had different historical traits, such as being sedentary or much less mobile. Mobility among cyclic migrants makes population isolation difficult, and diminished levels of intraspecific differentiation occur in avian migrants (I term this "Montgomery's rule"). Nevertheless, many lineages have differentiated despite increased mobility and a high propensity for gene flow, conditions that speciation theory has not addressed adequately. Populations of seasonal migrants usually occur in allopatry and sympatry during a migratory cycle, and this distributional pattern (heteropatry) is the focus of a model empirically developed to explain differentiation in migratory lineages. Divergence arises through disruptive selection from resource competition and heterogeneously distributed cyclic resources. Heteropatric speciation is a type of ecological speciation in which reproductive isolation increases between populations as a byproduct of adaptation to different environments that enhances breeding allopatry and allochrony despite degrees of sympatry that occur during the nonbreeding period in migration cycles. Mating or pair bonding in nonbreeding areas is rare. Patterns such as leapfrog migration and limited morphological divergence suggest that differentiation is driven by these ecological factors rather than by sexual selection or nontemporal changes in the resource base itself, although the additional presence of either of the latter would have additive divergent effects. Migratory lineages provide a largely neglected series of natural experiments in speciation in which to test predictions stemming from this model and others focusing on ecological speciation --
Author: Thomas R. Howell
Publisher: Univ of California Press
ISBN: 0943610877
Category : Nature
Languages : en
Pages : 125
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Book Description
Between December 1951 and April 1967, Thomas R. Howell made 13 separate research trips to Nicaragua. The result was a collection of over 2,000 bird skins and at least 16 publications that form the backbone of Nicaraguan ornithology. In the late 1970s, Howell began working on a manuscript that was intended to be his major contribution to the ornithology of the country. The first version of this "Check-list of the Birds of Nicaragua" was not ready until 1983, and many different typewritten versions circulated among a small but growing number of Nicaraguan biologists for the next two decades. Partly because of Howell's passion for detail and completeness, and finally because of his failing health in the late 1990s, the check-list was never published before his death in December 2004. This monograph remedies what had become a significant obstacle to further studies in the country by providing, in Howell's own words, a comprehensive background for subsequent explorations. It documents the 654 species (611 supported with specimen evidence) known to have occurred in Nicaragua as of 1993, the date of the last substantial revision of the manuscript, and also provides a rationale for anticipating another 44 species. The publication of this significant chapter in the history of Central American bird studies is offered both as a tribute to Tom Howell's enthusiasm and contributions and as a frame of reference and springboard for current and future ornithologists inspired to study the rich and still largely unexplored avifauna of Nicaragua--
Author: Frances C. James
Publisher: Univ of California Press
ISBN: 0943610850
Category : Nature
Languages : en
Pages : 88
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Book Description
Author: Kathreen Ruckstuhl
Publisher: Cambridge University Press
ISBN: 9780521835220
Category : Psychology
Languages : en
Pages : 512
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Book Description
Males and females of many species can, and do, live separately for long periods of time. This sexual segregation is widespread and can be on social, spatial or habitat scales. An understanding of sexual segregation is important in the explanation of life history and social preference, population dynamics and the conservation of rare species. Sexual Segregation in Vertebrates explores the reasons why this behaviour has evolved and what factors contribute to it.
Author: K. Wöhrmann
Publisher: Springer Science & Business Media
ISBN: 3642696465
Category : Science
Languages : en
Pages : 268
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Book Description
This volume contains the papers presented at a symposium on popula tion biology sponsored by the Deutsche Forschungsgemeinschaft. It was . held at the guest house of the University of Ttibingen at Oberjoch on May 15-19, 1983. Prior to this conference a small group of European biologists had met in Berlin (June 1981) and Pavia (September 1982) to discuss re search problems on the borderline between population genetics and evolutionary ecology. From the contributions and discussions at these meetings it became evident that the unification of approaches to evolutionary problems in population genetics and evolutionary ecology has not yet been suc cessful and requires further efforts. It was the consensus that a larger symposium with international participation would be helpful to con front and discuss the different approaches to population biology in order to assess "where we are now" and "where we should be going. " As a result an organizational committee was formed (F. Christiansen, S. Jayakar, V. Loeschcke, W. Scharloo, and K. W6hrmann) to iden tify topics that seemed, at least to them, to be fruitful in tackling problems in population biology. Consequently, a number of colleagues were asked to participate in the meeting. We have divided this book into chapters corresponding to the eight topics chosen. The volume begins with the relation between genotype and phenotype and is followed by a chapter on quantitative genetics and selection in natural populations.
Author: Barry S. Hewlett
Publisher: University of Michigan Press
ISBN: 9780472082032
Category : Family & Relationships
Languages : en
Pages : 230
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Book Description
This systematic study of non-Western fathers' roles in infant care focuses on the Aka pygmies of central Africa
Author: Napoleon Chagnon
Publisher: Routledge
ISBN: 1351329189
Category : Social Science
Languages : en
Pages : 340
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Book Description
This volume presents state-of-the-art empirical studies working in a paradigm that has become known as human behavioral ecology. The emergence of this approach in anthropology was marked by publication by Aldine in 1979 of an earlier collection of studies edited by Chagnon and Irons entitled Evolutionary Biology and Human Social Behavior: An Anthropological Perspective. During the two decades that have passed since then, this innovative approach has matured and expanded into new areas that are explored here. The book opens with an introductory chapter by Chagnon and Irons tracing the origins of human behavioral ecology and its subsequent development. Subsequent chapters, written by both younger scholars and established researchers, cover a wide range of societies and topics organ-ized into six sections. The first section includes two chapters that provide historical background on the development of human behavioral ecology and com-pare it to two complementary approaches in the study of evolution and human behavior, evolutionary psychology, and dual inheritance theory. The second section includes five studies of mating efforts in a variety of societies from South America and Africa. The third section covers parenting, with five studies on soci-eties from Africa, Asia, and North America. The fourth section breaks somewhat with the tradition in human behavioral ecology by focusing on one particularly problematic issue, the demographic transition, using data from Europe, North America, and Asia. The fifth section includes studies of cooperation and helping behaviors, using data from societies in Micronesia and South America. The sixth and final section consists of a single chapter that places the volume in a broader critical and comparative context. The contributions to this volume demonstrate, with a high degree of theoretical and methodological sophistication--the maturity and freshness of this new paradigm in the study of human behavior. The volume will be of interest to anthropologists and other professions working on the study of cross-cultural human behavior.
