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Articles 331 - 360 of 519

Full-Text Articles in Terrestrial and Aquatic Ecology

Effects Of Management Practices On Grassland Birds: Savannah Sparrow, David A. Swanson Jan 2002

Effects Of Management Practices On Grassland Birds: Savannah Sparrow, David A. Swanson

United States Geological Survey: Effects of Management Practices on Grassland Birds

Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 4,000 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds frequently are observed outside the breeding range indicated, the maps are intended to show areas where managers might concentrate their attention. It may be ineffectual to manage habitat at a site for a species that rarely occurs in an area. The species account begins with a brief capsule statement, which …

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Effects Of Management Practices On Grassland Birds: Lesser Prairie-Chicken, Brent E. Jamison, Jill A. Dechant, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Betty R. Euliss Jan 2002

Effects Of Management Practices On Grassland Birds: Lesser Prairie-Chicken, Brent E. Jamison, Jill A. Dechant, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Betty R. Euliss

United States Geological Survey: Effects of Management Practices on Grassland Birds

Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 4,000 published and unpublished papers. A range map is provided to indicate the breeding distribution of Lesser Prairie-Chicken in the United States and southern Canada. Although birds frequently are observed outside the breeding range indicated, the maps are intended to show areas where managers might concentrate their attention. It may be ineffectual to manage habitat at a site for a species that rarely occurs in an area. The species account begins with a brief capsule statement, which provides the fundamental …

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Effects Of Management Practices On Grassland Birds: Henslow’S Sparrow, James R. Herkert Jan 2002

Effects Of Management Practices On Grassland Birds: Henslow’S Sparrow, James R. Herkert

United States Geological Survey: Effects of Management Practices on Grassland Birds

were summarized from information in more than 4,000 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds frequently are observed outside the breeding range indicated, the maps are intended to show areas where managers might concentrate their attention. It may be ineffectual to manage habitat at a site for a species that rarely occurs in an area. The species account begins with a brief capsule statement, which provides the fundamental components or keys to management for the species. A section …

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Natural Fertility In Whooping Cranes And Mississippi Sandhill Cranes At Patuxent Wildlife Research Center, Jane M. Nicolich, George F. Gee, David H. Ellis, Scott G. Hereford Jan 2001

Natural Fertility In Whooping Cranes And Mississippi Sandhill Cranes At Patuxent Wildlife Research Center, Jane M. Nicolich, George F. Gee, David H. Ellis, Scott G. Hereford

Proceedings of the North American Crane Workshop

The first fertile whooping crane (Grus americana; WC) egg produced through natural breeding at Patuxent Wildlife Research Center (patuxent) was laid in 1991. Prior to that time, all fertile whooping crane eggs were the result of artificial insemination. Since 1991, eight different whooping crane pairs at Patuxent have produced fertile eggs through natural breeding. Mean fertility averages over years for each pair range from 40% to 93%. Fertility rates for each pair also vary greatly between years, from 0% to 100%, but the causes of the variance are unknown. Experiences with natural fertility in Mississippi sandhill cranes (G …

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Counting Cranes: How Much Effort Is Enough?, Douglas H. Johnson, Roderick C. Drewien, Douglas S. Benning Jan 2001

Counting Cranes: How Much Effort Is Enough?, Douglas H. Johnson, Roderick C. Drewien, Douglas S. Benning

Proceedings of the North American Crane Workshop

Accurate population estimates of sandhill cranes (Grus canadensis) are important because management decisions, such as establishing hunting regulations, are based on those estimates. Counts often are made during aerial surveys when the cranes are congregated. A complete census may be feasible if the area to be surveyed is small and adequate resources are available. For large areas, resources may be inadequate for a census so partial counts (sample surveys) are made. Because cranes are gregarious, the counts in a sample of units may contain either a disproportionately large, or a disproportionately small, fraction of the total, leading to …

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Nocturnal Roost Site Selection And Diurnal Habitat Use By Sandhill Cranes During Spring In Central Nebraska, Craig A. Davis Jan 2001

Nocturnal Roost Site Selection And Diurnal Habitat Use By Sandhill Cranes During Spring In Central Nebraska, Craig A. Davis

Proceedings of the North American Crane Workshop

During spring 1998 and 1999, the Platte River Whooping Crane Maintenance Trust conducted ground and aerial surveys of staging sandhill cranes (Grus canadensis; hereafter, cranes) to detennine roost site selection and habitat-use patterns along a l20-Ian stretch of the Platte River in south-central Nebraska. Cranes peaked at 232,023 during 22-28 March 1998 and 206,074 during 28 Februaty-6 March 1999 in the study area, a portion of the total crane staging area in the Platte River Valley. Diurnal observations showed that 48% of the cranes were in com fields, 34% in lowland grasslands, 13% in alfalfa fields, and 5% …

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Hematological And Serum Chemistry Norms For Sandhill And Whooping Cranes, Glenn H. Olsen, Melina M. Hendricks, Lindsay E. Dressler Jan 2001

Hematological And Serum Chemistry Norms For Sandhill And Whooping Cranes, Glenn H. Olsen, Melina M. Hendricks, Lindsay E. Dressler

Proceedings of the North American Crane Workshop

The nonnal values used as a diagnostic tool and for comparison of cranes were established in the early 1970's. In that early study, no effort was made to look at factors such as age, sex, or subspecies. In addition, during the early study disease problems (primarily disseminated visceral coccidiosis) and nutritional problems were undiagnosed and uncontrolled. For 2 years during the annual health examinations of cranes at the USGS Patuxent Wildlife Research Center (patuxent), we collected blood from healthy cranes for analysis. We found significant differences between the values reported from the 1970's and the values seen in this study …

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The One-By-One Method For Releasing Cranes, David H. Ellis, Daniel P. Mummert, Richard P. Urbanek, Matthew Kinloch, Carolee Mellon, Tressa Dolbeare, Damien P. Ossi Jan 2001

The One-By-One Method For Releasing Cranes, David H. Ellis, Daniel P. Mummert, Richard P. Urbanek, Matthew Kinloch, Carolee Mellon, Tressa Dolbeare, Damien P. Ossi

Proceedings of the North American Crane Workshop

Although the trend for the past 2 decades has been toward releasing naive groups of juveniles after a lengthy acclimation period, in 5 separate releases (1996-2000) we tested the idea that naive juvenile greater sandhill cranes (Grus canadensis tabida) would survive better if released singly into a wild flock of predator-wary birds than if left as a group, inexperienced at foraging and ill prepared to avoiding predators. We released 3 groups of hand-reared juveniles (n = 12 [1996]; n = 8 [1998], n = 12 [1999]) into a wild flock of sandhill cranes (ca 300 birds) on wintering …

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Platte River Cooperative Agreement And Proposed Program: Efforts To Protect, Restore, And Manage Habitat For Whooping Cranes, Least Terns, And Piping Plovers, Clayton Derby, Dale Strickland Jan 2001

Platte River Cooperative Agreement And Proposed Program: Efforts To Protect, Restore, And Manage Habitat For Whooping Cranes, Least Terns, And Piping Plovers, Clayton Derby, Dale Strickland

Proceedings of the North American Crane Workshop

On 1 July 1997 the states of Nebraska, Wyoming, and Colorado and the U.S. Department of the Interior signed the "Cooperative Agreement for Platte River Research and Other Efforts Relating to Endangered Species Habitats Along the Central Platte River, Nebraska" (Cooperative Agreement). In the Cooperative Agreement, the four parties set forth a "Proposed Platte River Recovery Implementation Program" (Program). The proposed incremental Program uses adaptive management to provide benefits to whooping cranes (Grus americana), least terns (Sterna albifrons), and piping plovers (Charadrius melodus). The proposed Program will also test the assumption that it is possible …

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The Use Of Radio Transmitters To Monitor Survival Of Sandhill Crane Chicks, Marilyn G. Spalding, Stephen A. Nesbitt, Stephen T. Schwikert, Robert J. Dusek Jan 2001

The Use Of Radio Transmitters To Monitor Survival Of Sandhill Crane Chicks, Marilyn G. Spalding, Stephen A. Nesbitt, Stephen T. Schwikert, Robert J. Dusek

Proceedings of the North American Crane Workshop

To determine cause of death of Florida sandhill crane (Grus canadensis pratensis) chicks, in 1996-99 we glued shorttenn transmitters on newly hatched chicks. At about 10 days of age, these were replaced with surgically implanted subcutaneous transmitters in the field. Chicks were then recaptured at 55 to 65 days of age for more pennanent transmitters. This combination of transmitter configurations allowed us to track individuals through their rapid-growth period.

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Lessons From The Motorized Migrations, David H. Ellis, George F. Gee, Kent R. Clegg, Joseph W. Duff, William A. Lishman, William J. L. Sladen Jan 2001

Lessons From The Motorized Migrations, David H. Ellis, George F. Gee, Kent R. Clegg, Joseph W. Duff, William A. Lishman, William J. L. Sladen

Proceedings of the North American Crane Workshop

Ten experiments have been conducted to determine if cranes can be led on migration and if those so trained will repeat migrations on their own. Results have been mixed as we have experienced the mishaps common to pilot studies. Nevertheless, we have learned many valuable lessons. Chief among these are that cranes can be led long distances behind motorized craft (air and ground), and those led over most or the entire route will return north come spring and south in fall to and from the general area of training. However, they will follow their own route. Groups transported south and …

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Use Of Traditional Indian Trapping Methods To Capture Sandhill Cranes, Scott G. Hereford, Tracy E. Grazia, Meenaksid Nagendran,, Ali Hussain Jan 2001

Use Of Traditional Indian Trapping Methods To Capture Sandhill Cranes, Scott G. Hereford, Tracy E. Grazia, Meenaksid Nagendran,, Ali Hussain

Proceedings of the North American Crane Workshop

The Mississippi sandhill crane (Grus canadensis pulla) is an endangered, nonmigratory subspecies of sandhill crane located only in Jackson County, Mississippi, on and adjacent to the Mississippi Sandhill Crane National Wildlife Refuge. Maintaining a marked population is essential to long-term monitoring efforts. Past trapping techniques such as walk-in traps and coffin traps were useful but not effective in capturing many cranes, wary of such obvious manmade devices. In 1998, refuge personnel recruited Master Bird Trapper, Ali Hussain from India, to demonstrate his low-tech, time-tested techniques. Hussain's traps such as the clap trap and nooses were highly portable, inexpensive, …

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Whooping Crane Egg Management: Options And Consequences, David H. Ellis, George F. Gee Jan 2001

Whooping Crane Egg Management: Options And Consequences, David H. Ellis, George F. Gee

Proceedings of the North American Crane Workshop

Eggs to build captive whooping crane (Grus americana) flocks and most eggs for reintroduction experiments have come from second viable eggs in 2-egg clutches in Canada. Four years ago, egg removal ceased. Based on reproductive rates for years when second eggs were removed and for years when eggs were not removed, we project numbers of young fledging in the wild and in captivity for the 2 most likely egg-management strategies. From existing data sets, we find that reproductive performance was, on average, better during the era of routine removal of the second viable eggs than when no manipulation …

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Ingested Metal In Whooping Cranes: An Endoscopic Technique For Removal And Implications For The Release Program, Glenn H. Olsen, Michael Wise Jan 2001

Ingested Metal In Whooping Cranes: An Endoscopic Technique For Removal And Implications For The Release Program, Glenn H. Olsen, Michael Wise

Proceedings of the North American Crane Workshop

Since 1993 when the whooping crane (Grus americana) release program in Florida started, 21 whooping cranes at the USGS Patuxent Wildlife Research Center (patuxent) have been diagnosed with gastrointestinal foreign bodies (primarily metal objects). A technique for safely removing these objects has been developed. The technique uses a flexible gastric endoscope to enter the proventriculus or ventriculus, and a snare or forceps passed down a channel of the endoscope to retrieve the foreign bodies. The technique is very successful, with the whooping crane usually back to its pen the next day. The longterm survival of the whooping cranes …

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Models For The Adaptive Harvest Management Of Rocky Mountain Sandhill Cranes: Problems And Potential, William L. Kendall, Roderick C. Drewien Jan 2001

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 …

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A Reintroduction Experiment Involving Mated Pairs Of Parent-Reared Greater Sandhill Cranes In Northern Arizona, Daniel P. Mummert, David H. Ellis, Carol L. Chambers Jan 2001

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 …

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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 Jan 2001

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%.

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Developing A Migratory Whooping Crane Flock, Robert H. Horwich Jan 2001

Developing A Migratory Whooping Crane Flock, Robert H. Horwich

Proceedings of the North American Crane Workshop

Research on crane reintroductions within the last 15 years has produced information necessary to effect a successful reintroduction of a migratory whooping crane (Grus americana) flock. There are 4 main problems to solve for such a reintroduction: (1) inducing a high survival rate of the reintroduced cranes, (2) encouraging normal reproduction with conspecifics, (3) teaching the reintroduced cranes the migration route, and (4) inducing fear of humans in the reintroduced cranes. Use of an isolation-rearing method by the author, using puppets, sounds, and costumes, has led to a consistent, over 80%, survival rate for the reintroduced young cranes …

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The Effects Of Semen Collection On Fertility In Captive, Naturally Fertile, Sandhill Cranes, Guojun Chen, George F. Gee, Jane M. Nicolich, Joanna A. Taylor Jan 2001

The Effects Of Semen Collection On Fertility In Captive, Naturally Fertile, Sandhill Cranes, Guojun Chen, George F. Gee, Jane M. Nicolich, Joanna A. Taylor

Proceedings of the North American Crane Workshop

We tested to see if semen collection interferes with fertility in naturally fertile pairs of cranes. We used 12 naturally fertile, Florida sandhill crane (Grus canadensis pratensis) pairs for this study, 6 control and 6 experimental. All pairs had previously produced fertile eggs. Semen was collected on Tuesday mornings and Friday afternoons from 26 February 1993 to 4 June 1993. We used standard artificial insemination methods to collect and to evaluate the semen and spermatozoa. Semen collection had minimal effect on semen quality and semen quantity. Semen volume, sperm density, sperm motility, sperm morphology, sperm viability, sperm number …

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Multiple Spatial Scale Analysis Of Whooping Crane Habitat In Nebraska, Amy L. Richert, Kevin E. Church Jan 2001

Multiple Spatial Scale Analysis Of Whooping Crane Habitat In Nebraska, Amy L. Richert, Kevin E. Church

Proceedings of the North American Crane Workshop

Geographic Information System (GIS) and remote sensing technologies were used to evaluate whooping crane stopover habitat in Nebraska. The goal of the research was to investigate habitat selection at multiple spatial scales. The GIS database consisted of all confirmed whooping crane sightings reported in Nebraska from 1975-1996 and land cover information delineated from color infrared aerial photographs and Landsat Thematic Mapper data. Results suggest that whooping cranes select roost habitat by recognizing site-level and landscape-scale land cover composition. Wetland is the most strongly selected habitat type at all spatial scales examined. This presentation emphasizes methods used to analyze habitat selection …

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Whooping Cranes Breeding At White Lake, Louisiana, 1939: Observations By John J. Lynch, U. S. Bureau Of Biological Survey, Roderick C. Drewien, John Tautin, Mary Lynch Courville, Gay M. Gomez Jan 2001

Whooping Cranes Breeding At White Lake, Louisiana, 1939: Observations By John J. Lynch, U. S. Bureau Of Biological Survey, Roderick C. Drewien, John Tautin, Mary Lynch Courville, Gay M. Gomez

Proceedings of the North American Crane Workshop

On 15 May 1939, Jo1m J. Lynch of the U.S. Bureau of Biological Survey located l3 whooping cranes (Grus americana), including 2 prefledged young, during an aerial survey near White Lake in southwestern Louisiana. His observation was the last historic record of whooping cranes breeding in the wild in the United States, and it confinned the presence of a nonmigratory breeding population along the Gulf Coast. While reviewing old U.S. Fish and Wildlife Service files at the National Archives in 1999, we located Lynch's original 1939 field note, 2 letters, 5 photographs, and a draft manuscript describing the …

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Results Of The Utah–Arizona Stage-By-Stage Migrations, David H. Ellis, Carolee Mellon, Matthew Kinloch, Tressa Dolbeare, Damien P. Ossi Jan 2001

Results Of The Utah–Arizona Stage-By-Stage Migrations, David H. Ellis, Carolee Mellon, Matthew Kinloch, Tressa Dolbeare, Damien P. Ossi

Proceedings of the North American Crane Workshop

In an effort to find a safer means of teaching cranes new migration routes, each year (in 1998 and 1999) we transported a group of greater sandhill cranes (Grus canadensis tabida) stage-by-stage, in a horse trailer, with stops for brief flights at about 30-km intervals, along a 1300-1400-km fall migration route from Fish Springs National Wildlife Refuge (Fish Springs) in west-central Utah to the vicinity of Gila Bend, Arizona. Thereafter, we released them into a wild flock of sandhill cranes. All stage-by-stage birds were hand-reared with both a plastic crane decoy (to encourage them to roost in water) …

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Using Ivermectin To Increase Survival Of Sandhill Crane Colts At Malheur National Wildlife Refuge, Oregon, Gary L. Ivey, Caroline P. Herziger Jan 2001

Using Ivermectin To Increase Survival Of Sandhill Crane Colts At Malheur National Wildlife Refuge, Oregon, Gary L. Ivey, Caroline P. Herziger

Proceedings of the North American Crane Workshop

Parasitic gapeworms (Cyathostoma sp.) caused 5.6% of mortalities of219 radiomarked greater sandhill crane (Grus canadensis tabida) colts at Malheur National Wildlife Refuge (NWR) in Oregon from 1991-98. From 1993-98 we tested the efficacy of ivennectin, an antihelmenthic drug, as a means of increasing colt survival by reducing gapewonn infestations. We selected pairs of siblings for the study, injecting 1 colt with ivennectin and not the other. We found significantly shorter survival times for untreated birds compared to those treated with ivennectin (P = 0.06). We conclude that in areas with gapewonn infestations in young cranes, the …

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Proceedings Of The Eighth North American Crane Workshop, 11–14 January 2000, Preface And Contents Jan 2001

Proceedings Of The Eighth North American Crane Workshop, 11–14 January 2000, Preface And Contents

Proceedings of the North American Crane Workshop

This volume includes reports from the January 2000 conference in Albuquerque, New Mexico, 2 papers not included in the previous proceedings, and a small number of invited papers intended to broaden the scope of the volume and to replace the few papers presented at the conference but withdrawn from publication. In serving as Editor, I wish, first of all, to express thanks to the many authors, reviewers, and associate editors, and to Gary Lingle who hosted the conference and was the intended Chief Editor: Gary underwent an employment change early in 2001 and so passed the task to me. I …

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Increased Egg Conservation: Is It Essential For Recovery Of Whooping Cranes In The Aransas/Wood Buffalo Population?, James C. Lewis Jan 2001

Increased Egg Conservation: Is It Essential For Recovery Of Whooping Cranes In The Aransas/Wood Buffalo Population?, James C. Lewis

Proceedings of the North American Crane Workshop

The whooping crane (Grus americana) is in a race for survival against adversities (genetic, demographic, and environmental) that are only partially understood. There is increasing evidence of genetic problems (drift, inbreeding, and loss of heterozygosity) in the captive population that likely also exist in the wild Aransas-Wood Buffalo Population (A WP), a consequence of the 1940s population bottleneck. Small populations are vulnerable to extinction through catastrophic events and random changes in productivity or survival. Negative environmental effects faced by whooping cranes include upstream diversion which diminish freshwater (nutrient) inflow into Texas wintering habitats, and expanding human activities along …

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Continuing Studies Of Ultralight Aircraft Applications For Introducing Migratory Populations Of Endangered Cranes, Kent R. Clegg, James C. Lewis Jan 2001

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 …

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Promoting Wildness In Sandhill Cranes Conditioned To Follow An Ultralight Aircraft, Joseph W. Duff, William A. Lishman, Dewitt A. Clark, George F. Gee, Daniel T. Sprague, David H. Ellis Jan 2001

Promoting Wildness In Sandhill Cranes Conditioned To Follow An Ultralight Aircraft, Joseph W. Duff, William A. Lishman, Dewitt A. Clark, George F. Gee, Daniel T. Sprague, David H. Ellis

Proceedings of the North American Crane Workshop

During the 1998 field season, we developed and tested a new protocol to teach sandhill cranes (Grus canadensis) to follow ultralight aircraft yet avoid humans. Although successful in teaching the cranes a migration route, our previous migration (1997) resulted in birds that were overly tame and sought association with humans. For this study, 16 sandhill cranes were costume-reared at USGS Patuxent Wildlife Research Center and transported to Ontario shortly before fledging. After the birds learned to follow the aircraft, 14 were transported to an isolated wintering site in South Carolina, 1300 km south of the training area. Twelve …

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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 Jan 2001

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 …

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Water Conditioning And Whooping Crane Survival After Release In Florida, George F. Gee, Jane M. Nicolich, Stephen A. Nesbitt, Jeff S. Hatfield, David H. Ellis, Glenn H. Olsen Jan 2001

Water Conditioning And Whooping Crane Survival After Release In Florida, George F. Gee, Jane M. Nicolich, Stephen A. Nesbitt, Jeff S. Hatfield, David H. Ellis, Glenn H. Olsen

Proceedings of the North American Crane Workshop

About 50% of the whooping cranes (Grus americana) released in Florida die within the first year of release. Most of these deaths and those in subsequent years result from bobcat (Lynx rufus) predation. Choosing release sites in open marshes away from bobcat habitat has improved survival. We hypothesized that exposure to ponds (water conditioning) at the rearing site would encourage birds to roost in deeper water marshes after release and such exposure would thereby reduce bobcat predation. In this study, we moved young birds (ca 50 days of age) to netted pens with large (I5-m diameter), deep (30--60 …

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Mortality Of Whooping Crane Colts In Wood Buffalo National Park, Canada, 1997–99, Douglas G. Bergeson, Brian W. Johns, Geoffrey L. Holroyd Jan 2001

Mortality Of Whooping Crane Colts In Wood Buffalo National Park, Canada, 1997–99, Douglas G. Bergeson, Brian W. Johns, Geoffrey L. Holroyd

Proceedings of the North American Crane Workshop

Twenty-two whooping crane (Grus americana) pairs with 2 young were monitored in Wood Buffalo National Park (WBNP) over 3 years to determine causes of colt mortality. The family groups were monitored from the ground, air, and with the aid ofradioteiemetry. We attached transmitters to 18 colts: 5 (28%) fledged, 5 (28%) succumbed to cumulative effects (head trauma, stress, exposure and/or infection), 4 (22%) were lost to unknown causes (3 of these went missing after they had lost their transmitters), 2 (11%) were taken by foxes (Vulpes vulpes), 1 (5.5%) was lost to raven (Corvus corax …

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