Population Cycles

Population Cycles PDF

Author: Alan Andrew Berryman

Publisher: Oxford University Press, USA

Published: 2002

Total Pages: 207

ISBN-13: 0195140982

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For over sixty years, understanding the causes of multiannual cycles in animal populations has been a central issue in ecology. This book brings together ten of the leaders in this field to examine the major hypotheses and recent evidence in the field, and to establish that trophic interactions are an important factor in driving at least some of the major regular oscillations in animal populations that have long puzzled ecologists.

Population Cycles

Population Cycles PDF

Author: Alan Berryman

Publisher: Oxford University Press

Published: 2002-11-07

Total Pages: 210

ISBN-13: 9780195349733

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For over sixty years, understanding the causes of multiannual cycles in animal populations has been a central issue in ecology. This book brings together ten of the leaders in this field to examine the major hypotheses and recent evidence in the field, and to establish that trophic interactions are an important factor in driving at least some of the major regular oscillations in animal populations that have long puzzled ecologists.

Complex Population Dynamics

Complex Population Dynamics PDF

Author: Peter Turchin

Publisher: Princeton University Press

Published: 2013-02-15

Total Pages: 471

ISBN-13: 1400847281

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Why do organisms become extremely abundant one year and then seem to disappear a few years later? Why do population outbreaks in particular species happen more or less regularly in certain locations, but only irregularly (or never at all) in other locations? Complex population dynamics have fascinated biologists for decades. By bringing together mathematical models, statistical analyses, and field experiments, this book offers a comprehensive new synthesis of the theory of population oscillations. Peter Turchin first reviews the conceptual tools that ecologists use to investigate population oscillations, introducing population modeling and the statistical analysis of time series data. He then provides an in-depth discussion of several case studies--including the larch budmoth, southern pine beetle, red grouse, voles and lemmings, snowshoe hare, and ungulates--to develop a new analysis of the mechanisms that drive population oscillations in nature. Through such work, the author argues, ecologists can develop general laws of population dynamics that will help turn ecology into a truly quantitative and predictive science. Complex Population Dynamics integrates theoretical and empirical studies into a major new synthesis of current knowledge about population dynamics. It is also a pioneering work that sets the course for ecology's future as a predictive science.

Population Fluctuations in Rodents

Population Fluctuations in Rodents PDF

Author: Charles J. Krebs

Publisher: University of Chicago Press

Published: 2013-04-19

Total Pages: 317

ISBN-13: 022601049X

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How did rodent outbreaks in Germany help to end World War I? What caused the destructive outbreak of rodents in Oregon and California in the late 1950s, the large population outbreak of lemmings in Scandinavia in 2010, and the great abundance of field mice in Scotland in the spring of 2011? Population fluctuations, or outbreaks, of rodents constitute one of the classic problems of animal ecology, and in Population Fluctuations in Rodents, Charles J. Krebs sifts through the last eighty years of research to draw out exactly what we know about rodent outbreaks and what should be the agenda for future research. Krebs has synthesized the research in this area, focusing mainly on the voles and lemmings of the Northern Hemisphere—his primary area of expertise—but also referring to the literature on rats and mice. He covers the patterns of changes in reproduction and mortality and the mechanisms that cause these changes—including predation, disease, food shortage, and social behavior—and discusses how landscapes can affect population changes, methodically presenting the hypotheses related to each topic before determining whether or not the data supports them. He ends on an expansive note, by turning his gaze outward and discussing how the research on rodent populations can apply to other terrestrial mammals. Geared toward advanced undergraduate students, graduate students, and practicing ecologists interested in rodent population studies, this book will also appeal to researchers seeking to manage rodent populations and to understand outbreaks in both natural and urban settings—or, conversely, to protect endangered species.

GMAT Official Guide 2018: Book + Online

GMAT Official Guide 2018: Book + Online PDF

Author: GMAC (Graduate Management Admission Council)

Publisher: John Wiley & Sons

Published: 2017-06-08

Total Pages: 855

ISBN-13: 1119402336

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The definitive guide from the makers of the GMAT exam The GMAT Official Guide 2018 is the definitive guide from the Graduate Management Admission Council, the makers of the GMAT exam. It contains over 900 real GMAT questions from past exams, including 130 never-before-seen questions, plus the following features: An overview of the exam to help you get familiar with the content and format Detailed answer explanations that explain how the test maker thinks about a question Actual essay topics, sample responses, and scoring information Comprehensive grammar and math review Questions organized in order of difficulty from easiest to hardest to focus your study Access to the same questions – plus additional integrated reasoning questions – online at gmat.wiley.com, where you can build your own practice sets Don’t waste time practicing on fake GMAT questions. Optimize your study time with the GMAT Official Guide 2018 using real questions from actual past exams.

Tundra

Tundra PDF

Author: Peter D. Moore

Publisher: Infobase Publishing

Published: 2009

Total Pages: 281

ISBN-13: 1438118724

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Describes the tundra biome, including climate, geology, geography and biodiversity.

Population Crises and Population Cycles

Population Crises and Population Cycles PDF

Author: Claire Russell

Publisher:

Published: 1999

Total Pages: 124

ISBN-13: 9780950406657

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Robert Malthus's original insights into the dangers of overpopulation are mentioned in the preliminary pages of this book. The writings presented consider population problems, crises and cycles.

The Chironomidae

The Chironomidae PDF

Author: P.D. Armitage

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 579

ISBN-13: 9401107157

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The dipteran family Chironomidae is the most widely distributed and frequently the most abundant group of insects in freshwater, with rep resentatives in both terrestrial and marine environments. A very wide range of gradients of temperature, pH, oxygen concentration, salinity, current velocity, depth, productivity, altitude and latitude have been exploited, by at least some chironomid species, and in grossly polluted environments chironomids may be the only insects present. The ability to exist in such a wide range of conditions has been achieved largely by behavioural and physiological adaptations with relatively slight morphological changes. It has been estimated that the number of species world-wide may be as high as 15000. This high species diversity has been attributed to the antiquity of the family, relatively low vagility leading to isolation, and evolutionary plasticity. In many aquatic ecosystems the number of chironomid species present may account for at least 50% of the total macroinvertebrate species recorded. This species richness, wide distribution and tolerance to adverse conditions has meant that the group is frequently recorded in ecological studies but taxonomic difficulties have in the past prevented non-specialist identification beyond family or subfamily level. Recent works, including genetic studies, have meant that the family is receiving much more attention globally.

Concepts of Biology

Concepts of Biology PDF

Author: Samantha Fowler

Publisher:

Published: 2018-01-07

Total Pages: 618

ISBN-13: 9789888407453

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Concepts of Biology is designed for the single-semester introduction to biology course for non-science majors, which for many students is their only college-level science course. As such, this course represents an important opportunity for students to develop the necessary knowledge, tools, and skills to make informed decisions as they continue with their lives. Rather than being mired down with facts and vocabulary, the typical non-science major student needs information presented in a way that is easy to read and understand. Even more importantly, the content should be meaningful. Students do much better when they understand why biology is relevant to their everyday lives. For these reasons, Concepts of Biology is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand.We also strive to show the interconnectedness of topics within this extremely broad discipline. In order to meet the needs of today's instructors and students, we maintain the overall organization and coverage found in most syllabi for this course. A strength of Concepts of Biology is that instructors can customize the book, adapting it to the approach that works best in their classroom. Concepts of Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand--and apply--key concepts.