Download or read book The Role of Diet in Regulating Reproductive Success and Contaminant Accumulation in Great Lakes Herring Gulls Larus Argentatus microform written by Craig Edwards Hebert and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1999 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contaminants in Herring Gull Eggs from the Great Lakes written by C. A. Bishop and published by . This book was released on 1997 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 12-page fact sheet which describes changes in the concentration of four selected organochlorine compounds found in herring gull eggs between 1971 and 1995. It also describes some of the biological effects associated with these chemicals which have been observed in both gerring gulls and other fish-eating waterbirds living on the Great Lakes. This fact sheet also explains the reasons for this ongoing monitoring program and how the results reflect the ongoing efforts being made to restore the Great Lakes ecosystem to a healthy state.
Download or read book Contaminants in Herring Gull Eggs from the Great Lakes written by Canada. Environment Canada and published by . This book was released on 1990 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Reproductive Success of Herring Gulls Larus Argentatus in Relation to Man s Activities written by George Lester Hunt and published by . This book was released on 1971 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distinguishing Between Specialism and Opportunism in the Diet of Herring Gulls written by Laura Post and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: For large gulls, predation of other waterbirds is generally considered a specialist strategy and may have potential benefits for reproductive success. During three years of study, however, nearly all herring gulls (Larus argentatus) breeding around the edges of a large ring-billed gull (L. delawarensis) colony on Gull Island, Ontario, were found to eat the chicks of this smaller species to some extent. I collected diet, behavioral, and productivity data to differentiate the extent to which predatory behavior was a specialist strategy or merely opportunistic, test the hypothesis that feeding on waterbirds is evolutionarily beneficial, and evaluate current management strategies in light of the results. Herring gulls predated ring-billed gull chicks most frequently when these chicks were most readily available: immediately after hatching and then again, around fledging when they formed crches on the beach. Herring gulls holding territories close to ring-billed gull crches exploited ring-billed gull prey to a greater extent. Behavioral watches and over 1,900 hours of remote video footage (both day and night) showed that all attacks were initiated within the herring gulls own breeding territories and predatory attacks did not include any specialized behavioral adaptations. Lastly, ring-billed gull chicks appeared to be a relatively poor food item for herring gull chicks and there was no consistent relationship between herring gull productivity and the proportion of ring-billed gull chicks in the diet. I conclude that at this site waterbird predation by herring gulls is predominantly opportunistic and does not appear to show any immediate benefit in terms of evolutionary fitness. This indicates that current management strategies based on controlling specialist predatory gulls are likely to be ineffectual in mixed-species colonies such as this and could be replaced by effective, non-lethal management, such as physical barriers.
Download or read book Reproductive Parameters and Egg Contaminant Levels of Great Lakes Herring Gulls written by A. P. Gilman and published by . This book was released on 1977 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reproductive Success of Great Black backed and Herring Gulls in Response to Egg Oiling written by Stephen J. Lewis and published by . This book was released on 1985 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aspects of the Nesting Ecology and the Effect of Vegetation Manipulations on Herring Gulls Larus Argentatus and Great Black backed Gulls L Marinus in Jamaica Bay New York written by Julia Lisa Tims and published by . This book was released on 1999 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diet choice and reproductive success of Great Black Backed Gulls Larus marinus and impacts on local breeding seabird populations written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diet Choice and Reproductive Success of Great Black backed Gulls Larus Marinus and Impacts on Local Breeding Seabird Populations written by Brian G. Veitch and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book DDT written by United States. Environmental Protection Agency and published by . This book was released on 1975 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Diseases of Wild Waterfowl written by Gary A. Wobeser and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Management of wild waterfowl has become increasingly intensive. Many birds now hatch in managed nesting cover or in artificial nesting structures, use man-made wetlands, and winter on crowded refuges while consuming a grain diet The water they use is often limited in supply and may contain residues from its many prior users. Unfortunately, intensified management often results in new problems, among which disease is important There are many similarities between the current form of management used for some waterfowl and that used in domestic animals. In both, the objective is to maintain a healthy, productive population. Dealing with health problems in waterfowl will benefit from combining the skills of veterinary medicine and wildlife ecology. Revisiting this book after 15 years allowed me to consider changes at the interface between the two disciplines. Veterinary medicine traditionally has been concerned with the individual and with treating sick animals, while the ecologist is concerned with populations and the manager has limited interest in treating sick birds. During this period there has been a marked increase in awareness among veterinarians that they have a responsibility in wildlife and conservation biology. Curricula of many veterinary colleges now include material on non-domestic animals and attempt to put disease in an ecological context. Also during this time, waterfowl managers have become more aware of disease as a factor in population biology and there are early attempts to put numbers to "disease" in models of continental waterfowl populations.
Download or read book Proceedings of the Grass Carp Symposium written by and published by . This book was released on 1994 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Supernormal Stimuli How Primal Urges Overran Their Evolutionary Purpose written by Deirdre Barrett and published by W. W. Norton & Company. This book was released on 2010-02-22 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Harvard psychologist explains how our once-helpful instincts get hijacked in our garish modern world. Our instincts—for food, sex, or territorial protection— evolved for life on the savannahs 10,000 years ago, not in today’s world of densely populated cities, technological innovations, and pollution. We now have access to a glut of larger-than-life objects, from candy to pornography to atomic weapons—that gratify these gut instincts with often-dangerous results. Animal biologists coined the term “supernormal stimuli” to describe imitations that appeal to primitive instincts and exert a stronger pull than real things, such as soccer balls that geese prefer over eggs. Evolutionary psychologist Deirdre Barrett applies this concept to the alarming disconnect between human instinct and our created environment, demonstrating how supernormal stimuli are a major cause of today’s most pressing problems, including obesity and war. However, Barrett does more than show how unfettered instincts fuel dangerous excesses. She also reminds us that by exercising self-control we can rein them in, potentially saving ourselves and civilization.
Download or read book Ethno ornithology written by Sonia C. Tidemann and published by Routledge. This book was released on 2012-08-06 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Indigenous knowledge that embraces ornithology takes in whole social dimensions that are inter-linked with environmental ethos, conservation and management for sustainability. In contrast, western approaches have tended to reduce knowledge to elemental and material references. This book looks at the significance of indigenous knowledge of birds and their cultural significance, and how these can assist in framing research methods of western scientists working in related areas. As well as its knowledge base, this book provides practical advice for professionals in conservation and anthropology by demonstrating the relationship between mutual respect, local participation and the building of partnerships for the resolution of joint problems. It identifies techniques that can be transferred to different regions, environments and collections, as well as practices suitable for investigation, adaptation and improvement of knowledge exchange and collection in ornithology. The authors take anthropologists and biologists who have been trained in, and largely continue to practise from, a western reductionist approach, along another path - one that presents ornithological knowledge from alternative perspectives, which can enrich the more common approaches to ecological and other studies as well as plans of management for conservation.
Download or read book The History Present Condition and Future of the Molluscan Fisheries of North and Central America and Europe written by Clyde L. MacKenzie and published by . This book was released on 1997 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coastal Dunes written by M. L. Martínez and published by Springer Science & Business Media. This book was released on 2007-09-14 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, coastal dune specialists from tropical and temperate latitudes cover a wide set of topics, including: geomorphology, community dynamics, ecophysiology, biotic interactions and environmental problems and conservation. The book offers recommendations for future research, identifying relevant topics where detailed knowledge is still lacking. It also identifies management tools that will promote and maintain the rich diversity of the dune environments in the context of continuing coastal development.
