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Full-Text Articles in Population Biology
Models For The Adaptive Harvest Management Of Rocky Mountain Sandhill Cranes: Problems And Potential, William L. Kendall, Roderick C. Drewien
Models For The Adaptive Harvest Management Of Rocky Mountain Sandhill Cranes: Problems And Potential, William L. Kendall, Roderick C. Drewien
Proceedings of the North American Crane Workshop
The migratory Rocky Mountain Population (RMP) of the greater sandhill crane (Grus canadensis tabida) breeds primarily in river valleys, marshes, and meadows of western Montana and Wyoming, southeastern Idaho, northern Utah, and northwestern Colorado. The RMP winters primarily in the Middle Rio Grande Valley of New Mexico, with smaller concentrations in the southwestern parts of that state, southeastern Arizona, and the northern highlands of Mexico. The San Luis Valley of Colorado is used as a stopover in both the spring and fall migrations. The RMP has been hunted on a permit basis since 1981, and currently these cranes …
A Reintroduction Experiment Involving Mated Pairs Of Parent-Reared Greater Sandhill Cranes In Northern Arizona, Daniel P. Mummert, David H. Ellis, Carol L. Chambers
A Reintroduction Experiment Involving Mated Pairs Of Parent-Reared Greater Sandhill Cranes In Northern Arizona, Daniel P. Mummert, David H. Ellis, Carol L. Chambers
Proceedings of the North American Crane Workshop
In April 1997, 4 mated pairs of adult greater sandhill cranes (Grus canadensis tabida) were abrupt-released at Monnon Lake, Arizona. Five of 8 adult cranes died within 10 days of release. One crane flew from the release area within 10 days after release and was never relocated. One pair of cranes, with 1 pair member sustaining a broken wing 4 days after release, survived for 4 months and demonstrated the importance of maintaining pair bonds after release. The cause of death of at least 5 birds was predation. The high immediate mortality and complete long-term mortality experienced in …
Minimum Survival Rates For Mississippi Sandhill Cranes: A Comparison Of Hand-Rearing And Parent-Rearing, David H. Ellis, George F. Gee, Glenn H. Olsen, Scott G. Hereford, Jane M. Nicolich, Nancy J. Thomas, Meenakshi Nagendran
Minimum Survival Rates For Mississippi Sandhill Cranes: A Comparison Of Hand-Rearing And Parent-Rearing, David H. Ellis, George F. Gee, Glenn H. Olsen, Scott G. Hereford, Jane M. Nicolich, Nancy J. Thomas, Meenakshi Nagendran
Proceedings of the North American Crane Workshop
Hand-reared (56) and parent-reared (76) juvenile Mississippi sandhill cranes (Grus canadensis pulla) were produced at the Patuxent Wildlife Research Center (patuxent), Laurel, Maryland over a 4-year period (1989-92) and released at the Mississippi Sandhill Crane National Wildlife Refuge (Refuge), Gautier, Mississippi in a controlled experiment. Hand-reared survival rates proved higher than for parent-reared survival for each time category: 6 months, 86% versus 75%; 1 year, 77% versus 68%; 2 years, 66% versus 53%; 3 years, 55% versus 43%: partial data for fourth and fifth years were 57% versus 31 % and 48% versus 37%.
Continuing Studies Of Ultralight Aircraft Applications For Introducing Migratory Populations Of Endangered Cranes, Kent R. Clegg, James C. Lewis
Continuing Studies Of Ultralight Aircraft Applications For Introducing Migratory Populations Of Endangered Cranes, Kent R. Clegg, James C. Lewis
Proceedings of the North American Crane Workshop
This research tested whether captive-reared cranes led by an ultralight aircraft (UL) along a migration route, would, after release on a wintering area, integrate with wild cranes and migrate in spring to their natal area without human assistance. This was the historical first motorized migration involving an endangered species. In 1997, whooping cranes (Grus americana) and greater sandhill cranes (Grus canadensis tabida) were group-reared in species-specific pens and 80% fledged. Beginning 13 October, 4 whooping cranes and 8 sandhill cranes were led along a 1, 133-km migration route from Grace, Idaho, to Bosque del Apache National …
Use Of Satellite Telemetry To Identify Temporal And Spatial Distribution Of The Midcontinent Sandhill Crane Population Throughout The Annual Cycle, Gary L. Krapu, David A. Brandt
Use Of Satellite Telemetry To Identify Temporal And Spatial Distribution Of The Midcontinent Sandhill Crane Population Throughout The Annual Cycle, Gary L. Krapu, David A. Brandt
Proceedings of the North American Crane Workshop
Effective management of the midcontinent sandhill crane (Grus canadensis) population requires having detailed information available on the distribution of subspecies and subpopulations throughout the annual cycle. The current study is being undertaken in partnership with several federal and state agencies and private organizations to obtain key information not currently available. We are monitoring crane movements throughout the year by attaching Platform Transmitting Terminals (PTTs) to plastic leg bands and with the aid of equipment on board orbiting NOAA weather satellites relocating the radiomarked individuals at 4-10 day intervals throughout the year. Twenty-one cranes were captured and radio-marked in …
Status Of Sandhill Cranes In Indiana, John S. Castrale, James Bergens
Status Of Sandhill Cranes In Indiana, John S. Castrale, James Bergens
Proceedings of the North American Crane Workshop
Historically, the sandhill crane (Grus canadensis) was considered a common migrant throughout Indiana and a locally abundant breeding bird in northwestern Indiana until 1929. Most of the Eastern Population of greater sandhill cranes (G. c. tabida) is thought to congregate each fall at Jasper-Pulaski Fish and Wildlife Area before migrating to Florida and Georgia. Systematic weekly fall counts began in 1967 and annual peak numbers have increased from 2,500 in 1967 to 27,600 in 1997, with a record count of 32,600 in 1991. Fall migrants are noticeable by late September, peak in mid-October through mid-November, and …
Tracking Sandhill Crane Migration From Saskatchewan To The Gulf Coast, Dale G. Hjertaas, David H. Ellis, Brian W. Johns, Stacie L. Moon
Tracking Sandhill Crane Migration From Saskatchewan To The Gulf Coast, Dale G. Hjertaas, David H. Ellis, Brian W. Johns, Stacie L. Moon
Proceedings of the North American Crane Workshop
Four adult sandhill cranes (Grus canadensis rowani) were captured in east-central Saskatchewan, equipped with transmitters, and tracked by satellite to detennine if their migration routes and wintering areas would allow their use as guide birds to establish a new migratory flock of whooping cranes (G. americana). Two birds captured near Yorkton died or their transmitters were lost before migration. Two adults from the Overflowing River moved to staging areas in southern Saskatchewan in September. By 29 September, Crane A left Saskatchewan and moved to North Dakota where it remained until late October. By 21 December, it …
Results Of The First Ultralight-Led Sandhill Crane Migration In Eastern North America, Joseph W. Duff, William A. Lishman, Dewitt A. Clark, George F. Gee, David H. Ellis
Results Of The First Ultralight-Led Sandhill Crane Migration In Eastern North America, Joseph W. Duff, William A. Lishman, Dewitt A. Clark, George F. Gee, David H. Ellis
Proceedings of the North American Crane Workshop
In 1997, we led 8 sandhill cranes (Grus canadensis) south from Ontario, Canada by ultralight aircraft to a wintering area near Warrenton, Virginia, an area without a wild population. Six others were transported south in a trailer in hopes they would return north with those that flew. The migration was 863 kIn long, included 14 stops, and took 21 days to complete. A1l13 SUIViving birds were wintered together. In March 1998, the surviving 7 "aircraft-led" birds departed the wintering site. The following day, 6 of the 7 were reported on the south shore of Lake Ontario. The flock …
Sandhill Crane Abundance At Grays Lake, Idaho, L J. Ball, Jane E. Austin, Adonia R. Henry
Sandhill Crane Abundance At Grays Lake, Idaho, L J. Ball, Jane E. Austin, Adonia R. Henry
Proceedings of the North American Crane Workshop
We initiated a study on the breeding ecology of greater sandhill cranes (Grus canadensis tabida) in the Grays Lake basin ofIdaho in 1997. Interest in the status of crane populations at Grays Lake is high; consequently, we present preliminary information on estimated size of the population, changes since the 1970s, and potential environmental factors involved. Drewien (1973) counted an average of549 cranes in the spring and estimated 250 nesting pairs in 1970-71. Number of nesting pairs reportedly increased 33% (to 332) by 1982 in response to intensive management, then declined 40-60% by 1996 (Drewien 1997, and Homocker Wildlife …
Nesting Ecology Of Sandhill Cranes At Grays Lake, Idaho, Jane E. Austin, L. J. Ball, Adonia R. Henry
Nesting Ecology Of Sandhill Cranes At Grays Lake, Idaho, Jane E. Austin, L. J. Ball, Adonia R. Henry
Proceedings of the North American Crane Workshop
We examined the nesting ecology of greater sandhill cranes (Grus canadensis tabida) at Grays Lake, Idaho during 1997-99 to detennine the effects of nest-site characteristics and land use on crane nest success. These are preliminary results from 3 years of a 4-year study. Crane nests were located in portions of the Grays Lake basin from early May through late June each year (n = 131 in 1997; n = 131 in 1998; n = 143 in 1999). Apparent nest success varied among years (54% in 1997, 71% in 1998, and 53% in 1999; overall average of 59%). We …
Results Of The Second (1996) Experiment To Lead Cranes On Migration Behind A Motorized Ground Vehicle, David H. Ellis, Brian Clauss, Tsuyoshi Watanabe, R. Curt Mykut, Matt Shawkey, Daniel P. Mummert, Daniel T. Sprague, Catherine H. Ellis, F. Benjamin Trahan
Results Of The Second (1996) Experiment To Lead Cranes On Migration Behind A Motorized Ground Vehicle, David H. Ellis, Brian Clauss, Tsuyoshi Watanabe, R. Curt Mykut, Matt Shawkey, Daniel P. Mummert, Daniel T. Sprague, Catherine H. Ellis, F. Benjamin Trahan
Proceedings of the North American Crane Workshop
Fourteen greater sandhill cranes (Grus canadensis tabida) were trained to follow a specially-equipped truck and 12 were led along a ca 620-Ian route from Camp Navajo in northern Arizona to the Buenos Aires National Wildlife Refuge near the ArizonalMexico border. Ten survived the trek, 380 Ian of which were flown, although only a few cranes flew every stage of the route. Major problems during the migration were powerline collisions (ca 15, 2 fatal) and overheating (when air temperatures exceeded ca 25° C). The tenacity of the cranes in following both in 1995 and 1996 under unfavorable conditions (e.g., …
Population Genetics Of Midcontinent Sandhill Cranes, Jessica L. Petersen, Richard Bischof, Allen L. Szalanski
Population Genetics Of Midcontinent Sandhill Cranes, Jessica L. Petersen, Richard Bischof, Allen L. Szalanski
Proceedings of the North American Crane Workshop
The Midcontinent Sandhill Crane Population is comprised of 3 subspecies, lesser (Grus canadensis canadensis), Canadian (G. c. rowani), and greater (G. c. tabida) sandhill cranes. In conjunction with the USGS Northern Prairie Wildlife Research Center, we studied the extent of genetic variation between and within each race of the Midcontinent Sandhill Crane Population. DNA was extracted from 150 feather and dried blood samples collected from 1995-99 from sandhill cranes in the Platte River Valley, central Nebraska. Parsimony and maximwn likelihood analysis of the mtDNA D-loop sequences (ca 675 bp amplified using PCR) from 29 …
A Comparison Of Behavior For Two Cohorts Of Captive-Reared Greater Sandhill Cranes Released In Northern Arizona, Daniel P. Mummert, Carol L. Chambers, David H. Ellis
A Comparison Of Behavior For Two Cohorts Of Captive-Reared Greater Sandhill Cranes Released In Northern Arizona, Daniel P. Mummert, Carol L. Chambers, David H. Ellis
Proceedings of the North American Crane Workshop
To determine how the behavior of greater sandhill cranes (Grus canadensis tabida) changes according to time of year, time of day, and number of days after release, we observed the activities of 2 groups of captive-reared greater sandhill cranes at Mormon Lake, northern Arizona. The behaviors we compared were alert, loafing, sleeping, foraging, preening, locomotion, and other. We found costume-reared subadult greater sandhill cranes that were established at the study site for a year spent more time foraging and being alert towards predators than parent -reared juvenile greater sandhill cranes that were recently released from captivity. We also …
Distribution, Abundance, And Reproduction Of The Cuban Sandhill Crane (Grus Canadensis Nesiotes), Xiomara Galvez Aguilera, Vicente Berovides Alvarez, Jose Rivera Rosales
Distribution, Abundance, And Reproduction Of The Cuban Sandhill Crane (Grus Canadensis Nesiotes), Xiomara Galvez Aguilera, Vicente Berovides Alvarez, Jose Rivera Rosales
Proceedings of the North American Crane Workshop
We discuss the distribution, abundance, and reproduction of the Cuban sandhill crane (Grus canadensis nesiotes). This is an overview of a 5-year study conducted by the National Organization for the Protection of Flora and Fauna of the Ministry of Agriculture for the Republic of Cuba and assisted by the International Crane Foundation and Brehm Fund. The distribution of this subspecies was determined by visiting potential sites and areas where this race has previously been reported. Nine new populations were found. This brings the total to 11 on the Isle of Cuba, 1 on Cayo Romano, and 2 on …
Woody Vegetation Expansion And Continuing Declines In Open Channel Habitat On The Platte River In Nebraska, Paul J. Currier
Woody Vegetation Expansion And Continuing Declines In Open Channel Habitat On The Platte River In Nebraska, Paul J. Currier
Proceedings of the North American Crane Workshop
Aerial videography in 1988 and 1994 of the same selected segments of the Big Bend reach of the Platte River in central Nebraska was compared. During this 6-year period, channel area declined 4 to 41 % (median 26%). In river segments where the channel had already narrowed significantly and at sites where channel habitat is actively managed declines were less (17-18%). These substantial changes occurred during a time that included a relatively low flow period (1990-92). Flows during the summer gertttination and establishment period (mid-May through August) for cottonwood (Populus deltoides) and willow (Salix spp.), the …
Home Range And Habitat Use By Isolation-Reared Sandhill Cranes, Wenrui Duan, Theodore A. Bookhouts, Richard P. Urbanek
Home Range And Habitat Use By Isolation-Reared Sandhill Cranes, Wenrui Duan, Theodore A. Bookhouts, Richard P. Urbanek
Proceedings of the North American Crane Workshop
We isolation-reared, placed radio transmitters on, and released 38 greater sandhill cranes (Grus canadensis tabida) on Seney National Wildlife Refuge (Seney) in 1988-90 to develop procedures for initiating new populations of cranes. Here we report on habitat selection by breeding birds with functional radio transmitters. Home ranges established by 6 cranes in 1992, when they were 2 to 4 years old, averaged 199±50.8 (SE) ha (harmonic mean method, 75 % utilization) and were of 2 types: feeding grounds separated from nesting habitat and feeding grounds adjacent to nesting habitat. Home ranges consisted of 36% emergent palustrine wetlands, 28% …
Monogamy And Productivity In Sandhill Cranes, Stephen A. Nesbitt, Thomas C. Tacha
Monogamy And Productivity In Sandhill Cranes, Stephen A. Nesbitt, Thomas C. Tacha
Proceedings of the North American Crane Workshop
Marked pairs of Florida (Grus canadensis pratensis) and greater sandhill cranes (G. c. tabida) were monitored for 426 pair-years. Among pair members, females averaged 3.7 ± 3.6 (SD) years older than males. Pair longevity was not correlated with pair productivity (P ~ 0.279) for pairs that were together >3 years. Forty-four percent of 72 Florida sandhill crane pair bonds were broken during the study, 67.7% due to death and 32.3 % to divorce. Among both Florida and greater sandhill cranes, the incidence of divorce was related to a failure to reproduce; 52.6% of pairs that failed to produce …
A Reintroduction Technique For Migratory Birds: Leading Canada Geese And Isolation-Reared Sandhill Cranes With Ultralight Aircraft, William A. Lishman, Tighe L. Teets, Joseph W. Duff, William J. L. Sladen, Galvin G. Shire, Kirk M. Goolsby, Wayne A. Bezner Kerr, Richard Urbanek
A Reintroduction Technique For Migratory Birds: Leading Canada Geese And Isolation-Reared Sandhill Cranes With Ultralight Aircraft, William A. Lishman, Tighe L. Teets, Joseph W. Duff, William J. L. Sladen, Galvin G. Shire, Kirk M. Goolsby, Wayne A. Bezner Kerr, Richard Urbanek
Proceedings of the North American Crane Workshop
No successful method for establishing self-sustaining populations of whooping cranes (Grus americana), particularly in a migration situation, has been proven. This research initiated development of a reintroduction technique using ultralight aircraft to lead cranes from a natal area along a desired route to a predetermined wintering site. Canada geese (Branta canadensis) were used in initial migration efforts. Ultralight aircraft and pilots successfully led 86 juvenile geese on 3 southbound migrations from Ontario to winter sites 640-1,312 kIn from the natal area. Of 16 1993-hatched geese that survived their first winter in Virginia and 35 1994- hatched …
Vocalizations Of Sandhill Cranes, Stephen A. Nesbitt, Richard A. Bradley
Vocalizations Of Sandhill Cranes, Stephen A. Nesbitt, Richard A. Bradley
Proceedings of the North American Crane Workshop
The structure and context of 20 vocalizations given by adult or juvenile sandhill cranes (Grus canadensis) are described. Purr calls were given under various circumstances (e.g., pre-flight, feeding, aggression) and communicated information over a short distance. Flight calls, guard calls, and urtison calls were full-voiced calls that carried information over greater distances. Calls given in flight were distinguishable from other calls. Guard calls were given in several different circumstances and served multiple functions; other calls were given in very specific contexts. Beyond the basic communication of information to other cranes, vocalizations may function in mate selection and in …
Use Of Ultralight Aircraft For Introducing Migratory Crane Populations, Kent R. Clegg, James C. Lewis, David H. Ellis
Use Of Ultralight Aircraft For Introducing Migratory Crane Populations, Kent R. Clegg, James C. Lewis, David H. Ellis
Proceedings of the North American Crane Workshop
Greater sandhill cranes (Grus canadensis tabida) were used as the research surrogate for whooping cranes (Grus americana) to determine if captive-reared cranes could be led by an ultralight aircraft (UL) along a migration route and if, after release on a wintering area, they would integrate with wild cranes and migrate north in spring to their natal area without assistance. In 1995, KRC raised 15 cranes to fledging and trained them to respond to his vocal imitation of a sandhill crane brood call. Chicks learned to follow him as he walked, drove an all-terrain vehicle (ATV) , …
Modeling The Population Dynamics Of Gulf Coast Sandhill Cranes, Douglas H. Johnson, William L. Kendall
Modeling The Population Dynamics Of Gulf Coast Sandhill Cranes, Douglas H. Johnson, William L. Kendall
Proceedings of the North American Crane Workshop
The Mid-continent Population of sandhill cranes (Grus canadensis) has a large geographic range. contains nearly 500,000 birds, and is hunted in much of its range. The population includes 3 subspecies; the numbers of 2 of these are uncertain, and they should be afforded protection from hunting that would be detrimental to their population. The 2 subspecies of concern tend to concentrate in the eastern part of the Great Plains during fall and spring and to winter along the Gulf Coast in Texas. This paper uses the limited information availahle ahout the Gulf Coast subpopulation in a model. We …
Subspecies Composition Of Sandhill Crane Harvest In North Dakota, 1968–94, William L. Kendall, Douglas H. Johnson, Stanley C. Kohn
Subspecies Composition Of Sandhill Crane Harvest In North Dakota, 1968–94, William L. Kendall, Douglas H. Johnson, Stanley C. Kohn
Proceedings of the North American Crane Workshop
North Dakota is a major fall staging area for the Mid-continent Population (MCP) of sandhill cranes (Grus canadensis), which is composed of 3 subspecies: the greater (G. c. tabida), Canadian (G. c. rawani), and lesser (G. c. canadensis). The number of cranes killed by hunters in North Dakota averaged 6,793 during the 1990-94 seasons, ranking second highest among crane-hunting states. The distribution of harvest among subspecies is important, due to concerns about the poorly known status of these subspecies, especially the greater. We estimated subspecies composition of the harvest in North Dakota by …
Sandhill Crane Use Of The Mid-Pecos Valley Of Eastern New Mexico, James B. Montgomery Jr.
Sandhill Crane Use Of The Mid-Pecos Valley Of Eastern New Mexico, James B. Montgomery Jr.
Proceedings of the North American Crane Workshop
Sandhill cranes (Grus canadensis) were monitored during winters 1989-94 in the mid-Pecos River Valley of eastern New Mexico to detennine how many used this region following a population decline in the 1980's. Numbers annually increased to a late October/early November peak (X = 7,017), fluctuated around 6,000 through December, declined in January (X = 3,531), and again peaked in February/early March (X = 5,737). Annual crane use-days (weekly counts X 7) varied from 500,545 to 1,007,673 (X = 760,606). Cranes foraged mainly in corn and sorghum stubble and alfalfa fields. Crop averages (ha) during 1990-92 were alfalfa 21,449, …
Summary Of Sandhill Crane Hunting Seasons In North Dakota, 1968–94, David E. Sharp, John E. Cornely
Summary Of Sandhill Crane Hunting Seasons In North Dakota, 1968–94, David E. Sharp, John E. Cornely
Proceedings of the North American Crane Workshop
The migratory Mid-continent Population (MCP), containing 3 subspecies, is the most numerous of all sandhill crane (Grus canadensis) populations. During fall the MCP uses major staging areas in the Canadian prairie provinces and northcentral United States. In North Dakota, sport hunting of the MCP resumed in 1968, after being closed during 1916-67. The resumption and expansion of crane hunting in North Dakota during 1968-94 followed a gradual panern of implementation. Subspecies considerations, the presence of whooping cranes (G. americana), crop depredation complaints. and public reaction influenced the geographic and temporal expansion of seasons. Harvests gradually increased …
Sandhill Crane Surveys In The Northern Interior Highlands Of Mexico, Roderick C. Drewien, Wendy M. Brown, Elwood G. Bizeau
Sandhill Crane Surveys In The Northern Interior Highlands Of Mexico, Roderick C. Drewien, Wendy M. Brown, Elwood G. Bizeau
Proceedings of the North American Crane Workshop
Most sandhill cranes (Grus canadensis) wintering in Mexico are found in the northern Interior Highlands of Chihuahua. We surveyed sandhill cranes in the states of Chihuahua and occasionally Durango, Mexico, in winters 1972-90. The population averaged 23,106 (SD = 10,369) in 11 counts at 5-6 areas in Chihuahua. Laguna de Babicora, the most important wetland for cranes wintering in Mexico, had the largest numbers (X = 16,012), followed by Ascension (x = 2,405) and Laguna de los Mexicanos (x = 1,468). All 3 migratory subspecies were present. The lesser subspecies (G. c. canadensis) comprised 85.7% of …
Satellite Tracking Of A Greater Sandhill Crane, Meenakshi Nagendran
Satellite Tracking Of A Greater Sandhill Crane, Meenakshi Nagendran
Proceedings of the North American Crane Workshop
The first satellite transmitter (PTT) to be used on a wild crane was deployed on an isolation-reared greater sandhill crane (Grus canadensis tabida) colt in south Texas on 6 November 1988. The 160-g transmitter required more than 8 hours of direct sunlight for the solar cells to recharge the NiCad battery power supply. Signal repetition rate was once every 60 seconds. National Oceanic and Atmospheric Agency satellites in polar orbits, equipped with Argos instruments, received PIT signals via a doppler shift mechanism. Information included location of PTT (bird), long-term activity, short-term activity, and ambient temperature. The crane colt …
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 …
Development Of An Isolation-Rearing/Gentle Release Procedure For Reintroducing Migratory Cranes, Richard P. Urbanek, Theodore A. Bookhout
Development Of An Isolation-Rearing/Gentle Release Procedure For Reintroducing Migratory Cranes, Richard P. Urbanek, Theodore A. Bookhout
Proceedings of the North American Crane Workshop
During 1988 -90, in an effort to develop a reintroduction technique for the whooping crane (Grus americana), we reared 38 greater sandhill crane chicks (G. canadensis tabida) in isolation from humans and gentle-released them on Seney National Wildlife Refuge (NWR) in the Upper Peninsula of Michigan. Chicks were reared in the field with a puppet/costume technique. After chicks completed acclimation to wild conditions in a release pen, we induced them to migrate by breaking their flock into small groups, translocating some groups, and using guide birds. Solutions to migration initiation problems encountered in 1988-89 were developed …
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, …
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).