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Full-Text Articles in Ornithology
Characteristics Of Whooping Crane Roost Sites In The Platte River, Craig A. Faanes, Douglas H. Johnson, Gary R. Lingle
Characteristics Of Whooping Crane Roost Sites In The Platte River, Craig A. Faanes, Douglas H. Johnson, Gary R. Lingle
Proceedings of the North American Crane Workshop
The Big Bend of the Platte River in centraJ Nebraska provides important migration habitat for whooping cranes (Grus americana). River profiles were obtained at 23 confumed nocturnal roost sites occupied by whooping cranes during 1983 -90. Whooping cranes selected roost sites that had shallower water depths than at unused sites. All but 4 roosts were located in channels wider than 150 m; roost sites were an average of 27.8 % of the channel width from the nearer shore. Nearly 90% of the roost sites had a trench of deeper water on both sides. Proper management of the Platte …
Whooping Cranes In Southwest Louisiana: History And Human Attitudes, Gay M. Gomez
Whooping Cranes In Southwest Louisiana: History And Human Attitudes, Gay M. Gomez
Proceedings of the North American Crane Workshop
When whooping cranes (Grus americana) inhabited southwest Louisiana's coastal marshes, residents viewed them as a food source and a crop pest, and shooting was commonplace. Local attitudes have changed as a result of education, stricter law enforcement, and decreased dependence on wildlife for subsistence, but hunting remains widespread. A 1977 proposal to reintroduce whooping cranes to southwest Louisiana generated strong opposition from the Louisiana Wild Life and Fisheries Commission (now Louisiana Department of Wildlife and Fisheries), based on concerns about critical habitat and its likely impact on waterfowl hunting and other traditional marsh uses. These concerns remain, though …
Whooping Crane Response To Disturbances At The Aransas National Wildlife Refuge, Thomas E. Lewis, R. Douglas Slack
Whooping Crane Response To Disturbances At The Aransas National Wildlife Refuge, Thomas E. Lewis, R. Douglas Slack
Proceedings of the North American Crane Workshop
Many forms of disturbance on and near the Aransas National Wildlife Refuge cause disruptions to wintering whooping cranes (Grus americana). Known forms of disturbance include various boating, aircraft, and automobile traffic. Natural disturbance from other wildlife also occurs. Behavioral observations and disturbance documentation have shown that Whooping cranes respond differently to various disturbances. Although airplane overflights, recreational boating, barge traffic. and workboat activity represent the most frequent disturbances to whooping cranes (22, 19, 14, and 13 %, respectively, of total disturbances), it appears that frequency of occurrence is less important than the disturbance class and distance from the …
Using National Wetlands Inventory Maps To Quantify Whooping Crane Stopover Habitat In Oklahoma, Dale W. Stahlecker
Using National Wetlands Inventory Maps To Quantify Whooping Crane Stopover Habitat In Oklahoma, Dale W. Stahlecker
Proceedings of the North American Crane Workshop
Three stratified random samples of the 416 National Wetland Inventory (NWI) maps within the western Oklahoma portion of the Wood Buffalo-Aransas whooping crane (Grus americana) migration corridor were used to evaluate the availability of wetland roost sites. Wetlands were eliminated as potential roosts if visibility was obscured by vegetation or slope, or if certain human activities occurred within 100-800 m. Thirty percent of all wetlands >0.04 ha passed map review, but only 7% passed when ground truthed. NWI map review was a poor predictor of suitability (33 % correct) but a good predictor of unsuitability (97 % correct). …
Whooper Recount: A Close Look At These Endangered Cranes Reveals That, While Their Numbers Are Increasing, Their Rate Of Increase Is Actually Declining, Paul A. Johnsgard
Whooper Recount: A Close Look At These Endangered Cranes Reveals That, While Their Numbers Are Increasing, Their Rate Of Increase Is Actually Declining, Paul A. Johnsgard
Papers in Ornithology
I have assembled figures for the 43-year period from 1938 through 1980, and have subjected them to various kinds of analysis. During this period, 220 young and 1,437 postjuvenile birds have appeared on the wintering grounds. This works out to an annual recruitment rate of 13.3 percent. (This is not exactly the same as the birthrate, of course, since the loss of eggs, chicks, and juveniles prior to arrival at Aransas is excluded.) The recruitment rate provides an estimate of the rate of maximum annual population increase. One hundred fifty-four birds that had been counted in any given year failed …