Author: John C. Ogden
Publisher:
ISBN:
Category : Birds
Languages : en
Pages : 276

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Author: North American Osprey Research Conference (1972 : College of William and Mary)
Publisher:
ISBN:
Category :
Languages : en
Pages : 258

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Author: John C. Ogden
Publisher:
ISBN:
Category :
Languages : en
Pages : 258

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Author: John C. Ogden
Publisher: Forgotten Books
ISBN: 9781390443486
Category : Science
Languages : en
Pages : 280

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Excerpt from Transactions of the North American Osprey Research Conference: College of William and Mary, Williamsburg, Virginia, 10-12 February 1972 Osprey Populations in Labrador and Northeastern Quebec Stephen P. Wetmore and Douglas 1. Gillespie Some Instant Benefits and long-range Hopes from color-saturation Banding of Ospreys Josephine and Gilbert Fernandez. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Author: United States. National Park Service
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author:
Publisher:
ISBN:
Category : Ospreys
Languages : en
Pages : 0

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Author: David Lawrence Evans
Publisher:
ISBN:
Category : Birds of prey
Languages : en
Pages : 76

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Depletion of fisheries due to acid rain may pose a future threat to bald eagle and osprey populations in some regions. Loss of essential habitat has affected declines in the caracara and western burrowing owl and the disappearance of the norther aplomado falcon from the southern United States. Most populations of the ferruginous hawk, marsh hawk, and prairie falcon appear stable; habitat loss is the most critical factor in population changes.

Author:
Publisher:
ISBN:
Category : Ecological assessment (Biology)
Languages : en
Pages : 340

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Author: Al Sandilands
Publisher: UBC Press
ISBN: 0774859431
Category : Nature
Languages : en
Pages : 369

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The vast literature on the history of birds is continually growing, but rarely has this information been compiled so that it is readily available in one reference work. Birds of Ontario is such a work, providing a comprehensive summary of the life history requirements of bird species in the province.

Author: Michael Gilbertson
Publisher: Springer Science & Business Media
ISBN: 940115290X
Category : Technology & Engineering
Languages : en
Pages : 305

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`Are the Great Lakes getting better or worse?' This is the question that the public, scientists and managers are asking the International Joint Commission after a quarter-century of cooperative action by the United States and Canadian governments to clean up the Great Lakes. This volume contains papers from the workshop on Environmental Results, hosted in Windsor, Ontario, by the Great Lakes Science Advisory Board of the International Joint Commission, on September 12 and 13, 1996. The Great Lakes have been through almost a century of severe pollution from the manufacture, use and disposal of chemicals. In the 1960s wildlife biologists started to investigate the outbreaks of reproductive failure in fish-eating birds and ranch mink and to link these to exposure to organochlorine compounds. Human health researchers in the 1980s and 1990s linked growth retardation, behavioral anomalies and deficits in cognitive development with maternal consumption of Great Lakes fish prior to pregnancy. The Great Lakes became the laboratory where the theory of endocrine disruptors was first formulated. Now a group of Great Lakes scientists, hosted by the International Joint Commission, has compiled the story of the trends in the concentrations and effects of persistent toxic substances on wildlife and humans. The technical papers review the suitability of various organisms as indicators, and present the results of long-term monitoring of the concentrations and of the incidence of effects. The evidence shows that there was an enormous improvement in the late 1970s, but that in the late 1990s there are still concentrations of some persistent toxic substances that have stubbornly remained at levels that continue to cause toxicological effects.