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Full-Text Articles in Population Biology
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 …
Behavior Of Sandhill Cranes Near Power Lines Marked With Yellow Aviation Balls, Anne E. Morkill, Stanley H. Anderson
Behavior Of Sandhill Cranes Near Power Lines Marked With Yellow Aviation Balls, Anne E. Morkill, Stanley H. Anderson
Proceedings of the North American Crane Workshop
The principal known cause of mortality for wild whooping cranes (Grus americana) is collision with powerlines. Methods to minimize powerline collisions will contribute to the species' long term recovery. We studied the flight behavior of sandhill cranes (G. canadensis) near powerlines marked with yellow aviation balls near the Platte River, Nebraska, in 1988-90. An age ratio of 24 juveniles:76 adults of 84 carcasses found under powerlines was significantly different from typical population ratios of 12: 88 for this species. Two-way contingency table analysis of crane flight behavior data indicated that cranes avoided markers (P < 0.(01), reducing the potential for collision. Proximity ofpowerlines to habitats used by cranes (P < 0.001), wind speed (P < 0.05), and age of bird (P < 0.(01) were important factors contributing to crane collisions with powerlines in Nebraska. Details are available in Wildl. Soc. Bull. 19(4):442-449.
Behavior Of Sandhill Cranes Harnessed With Different Satellite Transmitters, Glenn H. Olsen, David H. Ellis, Steven E. Landfried, Linda M. Miller, Susan S. Klugman, Charles H. Vermillion
Behavior Of Sandhill Cranes Harnessed With Different Satellite Transmitters, Glenn H. Olsen, David H. Ellis, Steven E. Landfried, Linda M. Miller, Susan S. Klugman, Charles H. Vermillion
Proceedings of the North American Crane Workshop
The effectiveness of various attachment methods and designs of platform transmitting terminals (PIT's) was tested on captive sandhill cranes (Grus canadensis) at the Patuxent Wildlife Research Center, Laurel, Maryland, during 1989-91. Combinations of attachment and transmitter designs included neoprene cord harness with batteries separate from the transmitter (2 harness designs), Teflon ribbon harness with batteries incorporated into the transmitter package (4 transmitter models), and a package attached directly to the bird with epoxy glue only. Physical effects seen on cranes wearing PTT's ranged from skin lacerations (caused by rubbing of harness material) to no observed effects (other than …
Behavior Of Whooping Cranes During Initiation Of Migration, Thomas V. Stehn
Behavior Of Whooping Cranes During Initiation Of Migration, Thomas V. Stehn
Proceedings of the North American Crane Workshop
Whooping cranes (Grus americana) observed immediately before the initiation of migratory flights exhibited increased alertness, wing ruffling, and head tilting. Seven observations at Aransas National Wildlife Refuge (NWR), Texas, indicate that the departure of 1 group of whooping cranes may influence other nearby cranes to start migration, even though later departing groups may fly separately.