Download or read book Bird Migration written by Eberhard Gwinner and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: E. GWINNER! The phenomenon of bird migration with its large scale dimensions has attracted the attention of naturalists for centuries. Worldwide billions of birds leave their breeding grounds every autumn to migrate to areas with seasonally more favor able conditions. Many of these migrants travel only over a few hundred kilo meters but others cover distances equivalent to the circumference of the earth. Among these long-distance migrants are several billion birds that invade Africa every autumn from their West and Central Palaearctic breeding areas. In the Americas and in Asia the scope of bird migration is of a similar magnitude. Just as impressive as the numbers of birds are their achievements. They have to cope with the enormous energetic costs of long-distance flying. particularly while crossing oceans and deserts that do not allow replenishment of depleted fat reserves. They have to appropriately time the onset and end of migrations. both on a daily and annual basis. And finally. they have to orient their migratory movements in space to reach their species- or population-specific wintering and breeding grounds, irrespective of the variable climatic conditions along their migratory routes.
Download or read book Optimal Migration written by Thomas Alerstam and published by . This book was released on 1998 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Passerine Migration written by Nikita Chernetsov and published by Springer Science & Business Media. This book was released on 2012-04-18 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most birds cannot cover the distance between their breeding and winter quarters in one hop. They have to make multiple flights alternated with stopovers. Which factors govern the birds’ decisions to stop, to stop for how long, when to resume flight? What is better – to accumulate much fuel and to make long flights for many hundreds of kilometres, or to travel in small steps? Is it necessary to find habitats similar to the breeding ones or other habitats would do? Are long migratory flights indeed so costly energetically as usually assumed? This monograph summarizes our current knowledge on the ecology of songbird migrants during migratory stopovers and on their behaviour.
Download or read book The Optimal Migration Duration and Activity Choice After Re migration written by Christian Dustmann and published by . This book was released on 2001 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book RSPB Migration Hotspots written by Tim Harris and published by Bloomsbury Publishing. This book was released on 2016-01-28 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Migration Hotspots brings the spectacle and excitement of amazing bird migrations to the general reader. Each spring and autumn hundreds of millions of birds - wildfowl, shorebirds, raptors, and passerines - migrate between higher and lower latitudes, or in some cases between high latitudes in the northern hemisphere and high latitudes in the southern hemisphere. In a handful of places around the world, a combination of geography, topography and climate combine to funnel migrant birds into narrow fronts, leading to migration hotspots, places where, for a few days each year, birds seem to be everywhere. The sight of thousands upon thousands of birds is one of nature's greatest wildlife spectacles. Migration Hotspots takes a look at 30 of the locations where the planet's most dramatic bird migration can be witnessed, from raptor bottlenecks such as Veracruz (Mexico) and the Strait of Messina (Italy) to places like Point Pelée (Canada) and Beidaihe (China) where spectacular falls of songbirds can take place. And from wetlands where huge numbers of waders stop over each spring and autumn to the great rarity islands of Scilly and Heligoland. The book covers each of the world's major avian flyways and features stunning photography throughout. The geographical reasons for the importance of each hotspot are explained, with a summary of the different birds that pass through and the best times of year to see them, and an introductory chapter summarises birds' migration strategies.
Download or read book Skilled Migration written by Hillel Rapoport and published by World Bank Publications. This book was released on 2004 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Docquier and Rapoport focus on the consequences of skilled migration for developing countries. They first present new evidence on the magnitude of migration of skilled workers at the international level and then discuss its direct and indirect effects on human capital formation in developing countries in a unified stylized model. Finally they turn to policy implications, with emphasis on migration and education policy in a context of globalized labor markets. This paper-- a product of the Trade Team, Development Research Group-- is part of a larger effort in the group to measure and understand the implication of the brain drain as part of the International Migration and Development Program"-- World Bank web site.
Download or read book Avian Migration written by Peter Berthold and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 601 pages. Available in PDF, EPUB and Kindle. Book excerpt: P. Berthold and E. Gwinnd Bird migration is an intriguing aspect of the living world - so much so that it has been investigated for as long, and as thoroughly, as almost any other natural phenomenon. Aristotle, who can count as the founder of scientific ornithology, paid very close attention to the migrations of the birds he ob served, but it was not until the reign of Friedrich II, in the first half of the 13th century, that reliable data began to be obtained. From then on, the data base grew rapidly. Systematic studies of bird migration were introduced when the Vogelwarte Rossitten was founded, as the first ornithological biological observation station in the world (see first chapter "In Memory of Vogelwarte Rossitten"). This area later received enormous impetus when ex perimental research on the subject was begun: the large-scale bird-ringing experiment initiated in Rossitten in 1903 by Johannes Thienemann (who was inspired by the pioneering studies of C. C. M. Mortensen), the experiments on photoperiodicity carried out by William Rowan in the 1920s in Canada and retention and release experiments performed by Thienemann in the 1930s in Rossitten, the first experimental study on the orientation of migratory birds. After the Second World War, migration research, while continuing in the previous areas, also expanded into new directions such as radar ornithology, ecophysiology and hormonal control mechanisms, studies of evolution, ge netics, telemetry and others.
Download or read book Exodus written by Paul Collier and published by Oxford University Press, USA. This book was released on 2013 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is one of the most pressing and controversial questions of our time -- vehemently debated, steeped in ideology, profoundly divisive. Who should be allowed to immigrate and who not? What are the arguments for and against limiting the numbers? We are supposedly a nation of immigrants, and yet our policies reflect deep anxieties and the quirks of short-term self-interest, with effective legislation snagging on thousand-mile-long security fences and the question of how long and arduous the path to citizenship should be. In Exodus, Paul Collier, the world-renowned economist and bestselling author of The Bottom Billion, clearly and concisely lays out the effects of encouraging or restricting migration. Drawing on original research and case studies, he explores this volatile issue from three perspectives: that of the migrants themselves, that of the people they leave behind, and that of the host societies where they relocate. Immigration is a simple economic equation, but its effects are complex. Exodus confirms how crucial it will be that public policy face and address all of its ramifications. Sharply written and brilliantly clarifying, Exodus offers a provocative analysis of an issue that affects us all.
Download or read book International Migration written by Slobodan Djajic and published by Routledge. This book was released on 2005-07-27 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a contemporary perspective on a broad range of international migration problems. It considers recent immigration trends and policies, examining migrant behaviour, illegal immigration and links between migration and trade.
Download or read book Migration and Mobility written by S. Ghatak and published by Springer. This book was released on 2001-09-12 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: People move, individually and collectively, for a combination of economic, social, political and cultural reasons. The impact of migration on the individuals concerned, their families, the countries they leave and the societies they join raises issues that are hotly contested by academics, policymakers and politicians. By using a wide variety of analytical approaches the contributors to this book reveal the complexity and significance of this increasingly important phenomenon in Western European countries, which links these societies to the wider world. They engage directly with the challenge which human mobility represents by examining the reasons for migration, the contribution and needs of those migrating, and the ways in which public debate about migration may be manipulated for political reasons.
Download or read book Animal Migration Orientation and Navigation written by Gauthreaux and published by Elsevier. This book was released on 2012-12-02 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Animal Migration, Orientation, and Navigation presents the various aspects of animal migration, including the evolution of migration, climatic and meteorological influences, and bioenergetics. This book discusses the physiological control, sensory systems, orientation and navigation, and biological clocks and phenology aspects of animal migration. Organized into five chapters, this book begins with an overview of the migration strategies of animals in the context of a space continuum. This text then explains the influence of short- and long-term climatic cycles on the spectrum of migratory patterns in nature. Other chapters consider the energetic requirements of different migration strategies and the energy stores of the migrants. This book discusses as well the physiological basis of animal migration, with emphasis on endocrinal findings on the timing and energetic aspects of different migration strategies. The final chapter deals with the mechanisms used in direction finding by migrating animals. This book is a valuable resource for biologists and ecologists.
Download or read book International Migration Outlook 2008 written by OECD and published by OECD Publishing. This book was released on 2008-09-10 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edition focuses on the employment situation of immigrants. For the first time, this report presents a “scoreboard” of labour-market integration of immigrants, as well as an analysis of wage differentials between immigrants and the native-born.
Download or read book Illustrated Seismic Processing written by Stephen J. Hill and published by SEG Books. This book was released on 2019 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a foundation for understanding the fascinating field of seismic processing. Written for the non-expert, this two-volume introductory text reveals the limitations and potential pitfalls of seismic data, prepares both seismic interpreters and acquisition specialists for working with seismic processing geophysicists, and much more.
Download or read book Migration The Biology of Life on the Move written by Davis Hugh Dingle Professor in the Department of Entomology and Center for Population Biology University of California and published by Oxford University Press, USA. This book was released on 1996-01-18 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Migration is one of the most fascinating and dramatic of all animal behaviors. Historically, however, the study of migration has been fragmented, with ornithologists, entomologists, and marine biologists paying little attention to work outside their own fields. This treatment of the subject shows how comparisons across taxa can in fact illuminate migratory life cycles and the relation of migration to other movements. The book thus takes an integrated ecological perspective, focusing on migration as a biological phenomenon. The work is divided into four parts, each with a brief introductory section. Part I defines migration, gives examples, and places migration in the spectrum of movement behaviors, concluding with a chapter on methods for its study. Part II focuses on proximate mechanisms, including physiology and morphology (and the constraints associated with them), the interactions between migration and wind and current patterns, and the various orientation and navigation mechanisms by which migrants find their way about. Part III on the evolution of migratory life histories addresses the evolutionary and ecological basis for migration and the roles of migration not only in the lives of organisms, but also in the ecological communities in which they live. Part IV is devoted to a brief consideration of migration and its relation to pest management and conservation. As a major contribution to a vital subject, this work will be valued by all researchers and students in the field of animal behavior, ecology, and zoology.
Download or read book Migration Patterns and Intentions of Floating Population in Transitional China written by Tiyan Shen and published by Springer Nature. This book was released on 2022-07-21 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book investigates domestic migration and migration intentions in China from the individual, city, and provincial levels. Since the 1990s, accompanying the rapid urbanization, an important feature of China’s social transition is its large-scale interregional migration, which has reshaped China’s economic geography and population distribution and greatly affected the socio-economic development. The floating population, migrants working and living in the destination cities without local hukou, have aroused wide public concern in the past decades. Based on China’s national population census data and China Migrants Dynamic Survey data, this book comprehensively employs statistical analysis, spatial analysis, network analysis, econometric and spatial econometric methods to analyze the spatial pattern and influencing mechanism of internal migration and migration intentions of floating population from different levels and different perspectives. The research results of this book have significant policy implications for the urban governance on the floating population. The novelty of this book is that it comprehensively investigates domestic migration and migration intentions from the individual, city and provincial levels, combining their spatial patterns and network structures. It not only provides a wealth of case studies for domestic migration research in China, but also broadens the research scope of spatial demography by employing new methods of spatial econometrics (such as MGWR and ESF). This book is suitable for undergraduates and graduates majoring in Human Geography, Regional Economics, Urban Planning and Urban Governance, as well as related researchers and practitioners.
Download or read book International Handbook on Migration and Economic Development written by Robert E.B. Lucas and published by Edward Elgar Publishing. This book was released on 2014-12-31 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Handbook summarizes the state of thinking and presents new evidence on various links between international migration and economic development, with particular reference to lower-income countries. The connections between trade, aid and migration ar
Download or read book International Handbook on the Economics of Migration written by Amelie F. Constant and published by Edward Elgar Publishing. This book was released on 2013-09-30 with total page 583 pages. Available in PDF, EPUB and Kindle. Book excerpt: ŠThis is an extremely impressive volume which guides readers into thinking about migration in new ways. In its various chapters, international experts examine contemporary migration issues through a multitude of lenses ranging from child labor, human t
