Abstracts » Zoology and wildlife conservation

Effects of diet on rate of body mass gain by wintering canvasbacks

Article Abstract:

Wintering canvasbacks have shifted their plant diets from American wildcelery to an animal diet of Baltic clams in response to habitat degradation in Chesapeake Bay. Using data gathered between 1990 and 1992, studies were conducted to determine the effect of the diet change on mass recovery rates among canvasbacks. The results indicated that the diet change has a incremental effect on the mass recovery rates of canvasbacks. Consequently, it has suggested that aquatic plant foods should be restored and maintained to increase the survivability of canvasbacks during winter and periods of prolonged deprivation.

Research, Food and nutrition, Natural history, Chesapeake Bay, Animal nutrition, Canvasback, Canvasback (Duck)

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Economic benefits of fertility control in wild horse populations

Article Abstract:

Costs incurred in several contraceptive treatments used by the Bureau of Land Management to manage wild horses are presented. It is concluded that savings can be increased when contraception is applied with conjunction with a removal policy that targets horses aged 0-4 years instead of 0-5 years.

Management dynamics, Administration of Conservation Programs, Bureau of Land Management, Management, Economic aspects, Growth, Company business management, United States. Bureau of Land Management, Company growth, Feral horses, Spaying and neutering

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Herbivory by resident geese: The loss and recovery of wild rice along the tidal Patuxent River

Article Abstract:

The extensive grazing by geese caused removal of wild rice in the tidal freshwater marshes of the Patuxent River. The means for recovery of rice was done by hunting of geese and replanting and protecting the rice by fencing.

Evaluation, Protection and preservation, Natural resources, Grazing, Wild rice, Patuxent River

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