Catégorie :: Livres anglais (6020 livres)

Mid-winter Numbers of Waterbirds in Bulgaria 1977-2001: Results from 25 Years of Mid-winter Counts Carried Out at the Most Important Bulgarian Wetlands
de T. Michev, L. Profirov(Ed. Pensoft Publishers) Isbn : 9546421758
94.53 €
In the present book for the first time in Bulgaria are presented results of 25 years of counts in the most important wetlands referring to the Mid-winter numbers of the waterbirds there. This long-term survey is a part of the regular counts of Divers, Grebes, Pelicans, Cormorants, Swans, Geese, Ducks, Coots, Waders, and Gulls, which take place in Europe, North Africa and the Middle East since 1967. The book consists of two main parts. In the first one are presented 45 most significant Bulgarian wetlands (lakes, swamps, reservoirs and other water bodies) along Danube and Black Sea coasts and inside the country. For each one of the wetlands there is a short characteristic indicating the average and the maximum values for the wintering birds, the first three most numerous species, the world t...

Ecology and Management of Cowbirds and Their Hosts: Studies in the Conservation of North American Passerine Birds
de Jamie Smith(Ed. University of Texas Press) Isbn : 0292777388
80.76 €
In the past two centuries, cowbirds have increased in numbers and extended their range across North America, while many of the native songbird species whose nests they parasitize to raise their young have declined. This timely book collects forty essays by most of the principal authorities on the biology and management of cowbirds. The book's goals are to explore the biology of cowbirds, the threats they pose to host species and populations, and the management programs that are being undertaken to minimize these threats. The book is organized into five sections, each with an extended editors' introduction that places the contributions in a broad, up-to-date setting. The sections cover : sum ; The changing abundance of cowbirds and the ways in which their numbers can be estimated. sum ; Hos...

Stellar Surface Structure: Proceedings of the 176th Symposium of the International Astronomical Union, Held in Vienna, Austria, October 9-13, 1995
de International Astronomical Union(Ed. Springer) Isbn : 0792340264
210.68 €
In the past decade, indirect (Doppler) imaging techniques have opened up a whole new discipline in stellar astronomy, providing increasingly detailed photometric, magnetic, and chemical inhomogeneity images of stellar surfaces. Furthermore, new optical interferometers are already being used with sophisticated interferometer techniques to image stellar surface structures more directly, and in the future the ESO VLT Interferometer and other instruments will extend these capabilities enormously. These developments are highlighted in the first two sections of this book. The large number of recent results, ground-based and space-based, and the lack of a generally accepted dynamo theory with predictive power for the stars and the Sun, result in an ever-growing complexity of interpretation of ind...

The Imperative Call: A Naturalist's Quest in Temperate and Tropical America
de Alexander F. Skutch(Ed. University Press of Florida) Isbn : 0813011493
18.96 €
In The Imperative Call, Alexander F. Skutch recounts his early years growing up in Maryland and Maine and his adventures in Central America and Jamaica during the 1920s and 1930s, well before modernization affected the region, when the began his classic studies of nesting birds. Weaving precise descriptions of tropical plan, bird, and animal life into a personal philosophy about man and nature, the book is both autobiography and natural history.

Birds of Tropical America: A Watcher's Introduction to Behavior, Breeding and Diversity
de Steven L. Hilty(Ed. Chapters Pub Ltd) Isbn : 1881527565
10.8 €
In the fifth in Chapters' splendid Curious Naturalist series, Hilty, who has led birding expeditions to Central and South America and the Caribbean, supplies not a field guide to species identification but rather a natural history of tropical birds. He writes about tropical diversity, nesting habits, the structure of a rain forest bird community, biogeography, Andean genealogy, bird migration within the tropics, bird color and patterns, seed dispersal, foraging techniques, courtship rituals, and song patterns. This is a fascinating book for enthusiastic birders and stay-at-home naturalists alike. George Cohen

Birds Of Tropical America: A Watcher's Introduction To Behavior, Breedings, And Diversity
de Steven L. Hilty(Ed. University of Texas Press) Isbn : 0292706731
28.46 €
In the fifth in Chapters' splendid Curious Naturalist series, Hilty, who has led birding expeditions to Central and South America and the Caribbean, supplies not a field guide to species identification but rather a natural history of tropical birds. He writes about tropical diversity, nesting habits, the structure of a rain forest bird community, biogeography, Andean genealogy, bird migration within the tropics, bird color and patterns, seed dispersal, foraging techniques, courtship rituals, and song patterns. This is a fascinating book for enthusiastic birders and stay-at-home naturalists alike. George Cohen

On the Wings of a North Wind: The Waterfowl and Wetlands of America's Inland Flyways
de Michael Furtman(Ed. Stackpole Books) Isbn : 0811717879
23.7 €
In the fall of 1989, Furtman, an outdoor writer and avid duck hunter, made a three-month-long journey from Saskatchewan to Louisiana to investigate the reasons for the steady decline in waterfowl (especially duck) populations in central North America, and to learn what is being done to counter that decline. This book is both a vivid travel narrative and a sobering summary of his findings. The main, though not the sole, cause of the decline is the steady conversion of the prairie wetlands where the ducks nest into farmland. Furtman met wildlife personnel, and a few farmers, who are struggling to save the habitat and the birds: most expressed a belief that time is running out. A readable, if pessimistic, summary of an important issue for general readers. Recommended to public libraries.- Pau...

A Passion for Birds: American Ornithology After Audubon
de Mark Barrow(Ed. Princeton University Press) Isbn : 0691044023
80.33 €
In the decades following the Civil War--as industrialization, urbanization, and economic expansion increasingly reshaped the landscape--many Americans began seeking adventure and aesthetic gratification through avian pursuits. By the turn of the century, hundreds of thousands of middle-and upper-class devotees were rushing to join Audubon societies, purchase field guides, and keep records of the species they encountered in the wild. Mark Barrow vividly reconstructs this story not only through the experiences of birdwatchers, collectors, conservationists, and taxidermists, but also through those of a relatively new breed of bird enthusiast: the technically oriented ornithologist. In exploring how ornithologists struggled to forge a discipline and profession amidst an explosion of popular in...

One Wing's Gift: Rescuing Alaska's Wild Birds
de Joan Harris(Ed. Alaska Northwest Books) Isbn : 0882405608
16.1 €
In the cleanup following the 1989 Exxon Valdez oil spill, workers rescued dozens of wild birds from the shores of Prince William Sound. One bald eagle, poisoned by oily prey, came to the rescue center with a wing so mangled it had to be amputated. No one expected the bird to survive. But even after vets repeatedly took the eagle's blood for transfusions to other eagles,«One Wing»clung to life, an unexpected survivor. ONE WING'S GIFT tells the heartwarming stories of this special bird and a...

Saving Migrant Birds: Developing Strategies for the Future
de John Faaborg(Ed. University of Texas Press) Isbn : 0292725485
23.76 €
In the 1980s, numerous scientific surveys documented both declining bird populations, especially among Neotropical songbirds that winter in the tropics, and the loss of tropical rain forest habitat. Drawing the seemingly obvious conclusion, scientists and environmental activists linked songbird declines to loss of tropical habitats and alerted the world to an impending ecological catastrophe. Their warnings led to the establishment of the Neotropical Migratory Bird Conservation Program, also known as Partners in Flight, the self-proclaimed largest conservation effort in history. Looking back over more than a decade of efforts to save migrant birds, John Faaborg offers the first serious evaluation of the state of songbird populations today, the effectiveness of conservation programs such as...