Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 4 of 4
Full-Text Articles in Life Sciences
The Ecology Of Native Grassland Macroinvertebrates And Feeding Ecology Of Sandhill Cranes, Craig A. Davis, Paul A. Vohs
The Ecology Of Native Grassland Macroinvertebrates And Feeding Ecology Of Sandhill Cranes, Craig A. Davis, Paul A. Vohs
Proceedings of the North American Crane Workshop
The ecology of native grassland macroinvertebrates along the Platte River in central Nebraska and their role in the feeding ecology of sandhill cranes (Grus canadensis) was examined on 3 native grasslands along the Platte River during late winter-early spring, 1989 and 1990. Four hundred forty-four soil samples from the study area were sorted for macroinvertebrates. Environmental factors such as soil moisture, water table depth, soil texture, and plant species composition were recorded from each soil collection site. Fifteen sandhill cranes, observed feeding for 40 minutes, were collected from 1 of the study areas. Maeroinvertebrates were collected from 4 …
Contaminant Residues In Sandhill Cranes Killed Upon Striking Powerlines In Central Nebraska, Timothy E. Fannin
Contaminant Residues In Sandhill Cranes Killed Upon Striking Powerlines In Central Nebraska, Timothy E. Fannin
Proceedings of the North American Crane Workshop
In 1989 and 1990, 58 sandhill cranes (Grus canadensis) were collected along the central Platte River in Nebraska during a study of mortality caused by powerline impact. Brains were assayed for acetylcholinesterase activity; gut contents were analyzed for residues of 25 organophosphate and 6 carbamate compounds; and livers were analyzed for 20 inorganics (including lead, mercury, and boron) and 22 organochlorine chemicals. Brain acetylcholinesterase activities appeared to be within normal ranges, and no measurable organophosphate or carbamate residues were found in the gut contents of 5 birds with the lowest brain enzyme activities. Heptachlor epoxide, oxychlordane. p,p' -DDE, …
Distribution Of Sandhill Cranes In The North Platte River Valley: 1980 And 1989, Martin J. Folk, Thomas C. Tacha
Distribution Of Sandhill Cranes In The North Platte River Valley: 1980 And 1989, Martin J. Folk, Thomas C. Tacha
Proceedings of the North American Crane Workshop
We observed the abundance, diurnal distribution, and habitat use of sandhill cranes (Grus canadensis) in the North Platte River Valley (NPRV) in 1989 for comparisons to similar data from 1979 to 1980. Sandhill cranes traveled farther from nocturnal roosts to diurnal feeding sites and use of the NPRV was lower in 1989 as compared to 1979~80. Presence of cranes in corn stubble and pasture increased from 1980 to 1989, while presence in alfalfa and palustrine wetlands decreased. Plowing of corn stubble fields and drought conditions in 1989 may have influenced crane distribution, abundance, and habitat use.
Temporal Patterns Of Sandhill Crane Roost Site Use In The Platte River, Bradley S. Norling, Stanley H. Anderson, Wayne A. Hubert
Temporal Patterns Of Sandhill Crane Roost Site Use In The Platte River, Bradley S. Norling, Stanley H. Anderson, Wayne A. Hubert
Proceedings of the North American Crane Workshop
Temporal patterns of daily arrival and departure of sandhill cranes (Grus canadensis) at roost sites were examined along the Platte River in Nebraska during spring 1990. Departure times were earliest and arrival times were latest during the beginning of the 8taging season (9-21 March). Date within the staging season was the primary variable associated with time of initial departure and arrival, but arrival and departure times were also influenced by climatic factors. Departure times correlated positively with fog and precipitation (P < 0.05) and negatively with air temperature (P < 0.05), whereas arrival times correlated positively with both cloud cover and air temperature (P < 0.05).