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Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
13.2.8. Rescue And Rehabilitation Of Oiled Birds, Sallie Welte, Lynne Frink
13.2.8. Rescue And Rehabilitation Of Oiled Birds, Sallie Welte, Lynne Frink
Waterfowl Management Handbook
Oil contamination of waterfowl and seabirds has been documented as a significant cause of morbidity and mortality in birds for more than 50 years. Each year more than one million birds may die from oil contamination in North Atlantic waters alone; worldwide mortality is unknown.
Of special concern is that many of the seabirds commonly affected are not prolific breeders, and assessment of each species’ status is handicapped by the difficulty of accurately monitoring trends in marine bird populations.
Oiled bird rehabilitation is an intensive, crisis-oriented response, requiring an experienced management agency, specialized medical expertise, stockpiles of specially designed equipment, …
13.4.6. Strategies For Water Level Manipulations In Moist-Soil Systems, Leigh H. Fredrickson
13.4.6. Strategies For Water Level Manipulations In Moist-Soil Systems, Leigh H. Fredrickson
Waterfowl Management Handbook
Water level manipulations are one of the most effective tools in wetland management, provided fluctuations are well-timed and controlled. Manipulations are most effective on sites with (1) a dependable water supply, (2) an elevation gradient that permits complete water coverage at desired depths over a majority of the site, and (3) the proper type of water control structures that enable water to be supplied, distributed, and discharged effectively at desired rates. The size and location of structures are important, but timing, speed, and duration of drawdowns and flooding also have important effects on plant composition, plant production, and avian use. …
13.4.7. Managing Beaver To Benefit Waterfowl, James K. Ringelman
13.4.7. Managing Beaver To Benefit Waterfowl, James K. Ringelman
Waterfowl Management Handbook
Aside from humans, no other organism has the capacity to modify its environment as much as the beaver. In doing so, beaver create wetlands that provide valuable waterfowl habitats. Because beavers are widely distributed in North America (Fig. 1), beaver ponds can benefit waterfowl during breeding, migrating, and wintering periods. Mismanaged beaver populations, however, can severely degrade riparian habitats and become a costly problem. The key to successfully managing beaver for waterfowl benefits is understanding the values of beaver ponds in meeting the seasonal needs of waterfowl. Beaver populations must then be managed to provide these benefits in a self-sustaining …
13.4.18. Chufa Biology And Management, James R. Kelley Jr., Leigh H. Fredrickson
13.4.18. Chufa Biology And Management, James R. Kelley Jr., Leigh H. Fredrickson
Waterfowl Management Handbook
Chufa (Cyperus esculentus) is an emergent perennial sedge that is common in seasonally flooded wetlands. Although chufa is common in many States, it is most abundant in the Southeast, including the Mississippi alluvial valley (Fig. 1). Belowground biomass of chufa, especially the tubers, serves as a valuable food source for waterfowl and cranes. Chufa tubers rank tenth among the most important waterfowl foods in the United States.
13.1.3. Life History Strategies And Habitat Needs Of The Northern Pintail, Leigh H. Fredrickson, Mickey E. Heitmeyer
13.1.3. Life History Strategies And Habitat Needs Of The Northern Pintail, Leigh H. Fredrickson, Mickey E. Heitmeyer
Waterfowl Management Handbook
The northern pintail (hereafter pintail) is a common dabbling duck distributed throughout the Northern Hemisphere. Since 1955, the breeding population in North America has averaged 5,566,000, fluctuating between 10,124,000 (1956) and 2,471,000 (1989; Fig. 1). Pintail numbers are especially sensitive to habitat conditions that reflect the wet–dry cycle in the shortgrass prairie breeding areas of south-central Canada and the northern Great Plains of the United States. Populations of pintails also are affected by habitat conditions in key wintering areas, such as the Central Valley of California and Gulf Coast marshes. When wintering areas are fairly dry, birds have fewer resources …