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Full-Text Articles in Ornithology
Evidence Of Polygyny In A Greater Sandhill Crane, Gary L. Ivey, Chad W. August
Evidence Of Polygyny In A Greater Sandhill Crane, Gary L. Ivey, Chad W. August
Proceedings of the North American Crane Workshop
No abstract provided.
Sandhill Crane Lead Poisonings Linked To A Wetland Restoration, Andrew J. Caven, Joshua D. Wiese
Sandhill Crane Lead Poisonings Linked To A Wetland Restoration, Andrew J. Caven, Joshua D. Wiese
Proceedings of the North American Crane Workshop
Toward the end of the 2018 spring sandhill crane migration on the Platte River in Nebraska, we detected 7 dead cranes near a recently restored wetland within 200 m of the river’s main channel. Topographic recontouring of the soils had occurred in January of 2018 and the area was not yet revegetated. The area had formerly hosted an excavated pond where hunting occurred for many years prior to the 1991 ban on lead ammunition for waterfowl harvest. Two of the cranes with no physical signs of trauma were submitted for necropsy. The cause of death in both cases as lead …
Correlates Of Sandhill Crane Off-Channel Roosting Behavior In The Platte Valley, Bethany L. Pstrom, Andrew J. Caven
Correlates Of Sandhill Crane Off-Channel Roosting Behavior In The Platte Valley, Bethany L. Pstrom, Andrew J. Caven
Proceedings of the North American Crane Workshop
During spring migration, more than 1 million sandhill cranes stage along the Platte River in central Nebraska. Appropriate river flows can support ideal depths for roosting and provide protection from terrestrial predators. Cranes and other waterbirds occasionally roost outside of the river channel or reduce diurnal activity therein but conditions under which this occurs remain poorly defined. Despite the ability to influence flows in this highly managed river system, many hydrological factors remain outside of managers’ control. We examine the proportion of sandhill cranes detected in nonriverine habitat during weekly aerial surveys from mid-February to mid-April from 2016 to 2023. …
Habitat Use By Sandhill Cranes Wintering In The Agricultural Landscape Of The Sacramento–San Joaquin River Delta Of California, Gary L. Ivey, Bruce D. Dugger, Caroline P. Herziger, Michael L. Casazza, Joseph P. Fleskes
Habitat Use By Sandhill Cranes Wintering In The Agricultural Landscape Of The Sacramento–San Joaquin River Delta Of California, Gary L. Ivey, Bruce D. Dugger, Caroline P. Herziger, Michael L. Casazza, Joseph P. Fleskes
Proceedings of the North American Crane Workshop
The Sacramento–San Joaquin Delta region of California is an important wintering region for sympatric greater (Grus canadensis tabida) and lesser (G. c. canadensis) sandhill cranes. Basic information about sandhill crane use of habitats in their winter landscape is needed to design a biologically driven conservation strategy. We monitored a sample of radio-tagged birds of each subspecies for 2 winters and conducted foraging counts to document their habitat use. Cranes used the major crops and habitat types that were available in the landscapes surrounding their roost sites and focused most of their foraging in grain crops. We examined habitat selection surrounding …
Temporal Patterns Of Sandhill Crane Use Of The Pecos River Valley, Chaves County, New Mexico, James B. Montgomery Jr.
Temporal Patterns Of Sandhill Crane Use Of The Pecos River Valley, Chaves County, New Mexico, James B. Montgomery Jr.
Proceedings of the North American Crane Workshop
The Pecos River Valley is an important stopover area for both migrating and wintering sandhill cranes (Grus canadensis) in southeastern New Mexico. The combination of shallow impoundments and a playa lake at Bitter Lake National Wildlife Refuge, off-refuge shallow ponds and riverine wetlands, and approximately 20,000 ha of nearby irrigated farmlands in Chaves County provided roosting and foraging areas used by the cranes. Once per week sandhill cranes were counted when departing their roosts during September through April 2005–2024. The fall migration during October and November peaked at 24,431 ± 204 (SE). During this peak period, cranes divided foraging between …
Initial Evaluation Of Cyclic Adenosine Monophosphate Enzyme Immunoassay For Use With Crane Semen Samples, Megan E. Brown, Kim Boardman, Katie L. Edwards
Initial Evaluation Of Cyclic Adenosine Monophosphate Enzyme Immunoassay For Use With Crane Semen Samples, Megan E. Brown, Kim Boardman, Katie L. Edwards
Proceedings of the North American Crane Workshop
The management of ex situ and in situ populations of many wildlife species requires detailed knowledge of a species’ reproductive biology. For species such as cranes, where artificial insemination is a critical component of ex situ management strategies, understanding normal sperm function is especially important. Previous research has shown that captive cranes exhibit highly variable production and quality of semen samples produced by individual males and high levels of variation of cell concentration and motility across different species. Cyclic adenosine monophosphate (cyclic AMP) has been implicated in regulating sperm function, such as cell motility, and may affect an individual’s ability …
Mixing Of Two Greater Sandhill Crane Populations In Northeast Oregon, M. Cathy Nowak, Krista J. Mougey, Daniel P. Collins, Blake A. Grisham
Mixing Of Two Greater Sandhill Crane Populations In Northeast Oregon, M. Cathy Nowak, Krista J. Mougey, Daniel P. Collins, Blake A. Grisham
Proceedings of the North American Crane Workshop
The Oregon Department of Fish and Wildlife (ODFW) Ladd Marsh Wildlife Area in northeast Oregon hosts a small group of nesting greater sandhill cranes (Grus canadensis tabida). There were no data on where these birds wintered, and we had no understanding of how these birds fit into the larger picture of western sandhill crane population delineation. ODFW began color-banding pre-fledging colts in 2007 and added satellite tracking with platform transmitter terminals (PTTs) in 2015. To date, we have captured 15 colts and 13 adults and marked them with color bands. We also fitted 1 colt and 8 adult …
Effective And Sustainable Prevention Of Avian Damage To Planted Seeds Through Seed Treatment, Jeb A. Barzen, Kenneth E. Ballinger Jr.
Effective And Sustainable Prevention Of Avian Damage To Planted Seeds Through Seed Treatment, Jeb A. Barzen, Kenneth E. Ballinger Jr.
Proceedings of the North American Crane Workshop
Several species of cranes and other wildlife have recovered from low populations because, in part, they have adapted to resources found in agricultural environments. If future conservation strategies are to succeed in areas dominated by agricultural use, we must develop sustainable models that solve crop damage problems that are caused by expanding wildlife populations. Using crane damage to planted seed as an example, we propose 1 such model of sustainable crop damage prevention. The deterrent, 9,10-anthraquinone (AQ), is a natural product produced by plants, in part to control bird frugivory, and induces gastro-intestinal distress (temporarily sickens an individual) in sandhill …
Whooping Crane And Sandhill Crane Monitoring At Five Wind Energy Facilities, Clayton E. Derby, Melissa M. Welsch, Terri D. Thorn
Whooping Crane And Sandhill Crane Monitoring At Five Wind Energy Facilities, Clayton E. Derby, Melissa M. Welsch, Terri D. Thorn
Proceedings of the North American Crane Workshop
Biologists have expressed concern that individuals of the Aransas-Wood Buffalo Population of the federally endangered whooping crane (Grus americana), numbering about 300, may be injured or killed by wind turbines during migration. To help address this concern and curtail (stop) turbine operations when whooping cranes approached turbines, we monitored the area around 5 wind energy facilities in North and South Dakota during spring and fall migration for whooping cranes and sandhill cranes (G. canadensis). Observers monitored cranes for 3 years at each facility from 2009 to 2013 (1,305 total days of monitoring), recording 14 unique observations …
Winter Distribution Of Sandhill Cranes From Upper Michigan And Adjacent Ontario: A Thirty-Year Perspective, Richard P. Urbanek
Winter Distribution Of Sandhill Cranes From Upper Michigan And Adjacent Ontario: A Thirty-Year Perspective, Richard P. Urbanek
Proceedings of the North American Crane Workshop
The relationship between areas used for breeding and wintering by the expanding Eastern Population of greater sandhill cranes (Grus canadensis tabida) has been little studied. During 1985-1988, 32/33 (97%) of sandhill cranes VHFradiotagged on Seney National Wildlife Refuge (NWR) in the Upper Peninsula of Michigan were subsequently located on wintering areas in wet prairies, muck farms, and improved pastures in Florida and southern Georgia. Four additional radiotagged cranes from other areas of Upper Michigan and 7 from the North Channel of Lake Huron, Ontario, were also located in similar areas and habitats. Winter area was not dependent on …
A Preliminary Study Of The Influence Of Breeding Area Density On Sandhill Crane Habitat Selection In South-Central Wisconsin, Sara A. Prussing, Hillary L. Thompson
A Preliminary Study Of The Influence Of Breeding Area Density On Sandhill Crane Habitat Selection In South-Central Wisconsin, Sara A. Prussing, Hillary L. Thompson
Proceedings of the North American Crane Workshop
We hypothesized that territorial sandhill cranes (Grus canadensis) in densely populated breeding areas occupy smaller home ranges that are richer in optimal habitat than those in less densely populated breeding areas. We analyzed satellite telemetry data collected from 2012 to 2016 for 3 and 2 sandhill cranes from dense and less dense breeding areas, respectively. Tracked sandhill cranes in a dense breeding area tended to have smaller home ranges (0.37-14.25 km2) with higher concentrations of wetlands (27%) and row crops (40%) than tracked sandhill cranes in the less dense breeding area (8.80-48.81 km2, 14% …
Hematology Results From Experimental Exposure Of Sandhill Cranes To West Nile Virus, Glenn H. Olsen
Hematology Results From Experimental Exposure Of Sandhill Cranes To West Nile Virus, Glenn H. Olsen
Proceedings of the North American Crane Workshop
West Nile virus (WNV), a Flavivirus, was introduced into New York City in 1999 (Centers for Disease Control 1999, Enserink 1999). In the past decade the virus has spread across the continental United States and southern Canada, resulting in large numbers of deaths among native bird species (Anderson et al. 1999, Calle et al. 2000). The U.S. Geological Survey (USGS) Patuxent Wildlife Research Center in Laurel, Maryland, is home to the world’s largest collection of cranes. These cranes are used for research and for reintroduction programs. As of 20 October 2016, this collection included 77 of the highly endangered whooping …
Photoperiod And Nesting Phenology Of Whooping Cranes At Two Captive Sites, Glenn H. Olsen
Photoperiod And Nesting Phenology Of Whooping Cranes At Two Captive Sites, Glenn H. Olsen
Proceedings of the North American Crane Workshop
Increasing day length is considered to be a stimulus to breeding in many avian species in northern latitudes (Welty 1975). Crane species that breed in high latitudes include Siberian crane (Leucogeranus leucogeranus), lesser sandhill crane (Grus canadensis canadensis), hooded crane (G. monacha), and whooping crane (G. americana). The first captive breeding records for hooded and Siberian cranes were induced with the use of artificially extended photoperiods (Mirande et al. 1996). Most likely, cranes that breed in mid-latitudes also respond to increasing daylight. In 1 study, captive greater sandhill cranes (G. c. …
Differential Detection Of Territorial And Non-Territorial Greater Sandhill Cranes In Summer, Lindsey F. Mckinney, Jeb A. Barzen, Jason D. Riddle, Shelli A. Dubay, Tim F. Ginnett
Differential Detection Of Territorial And Non-Territorial Greater Sandhill Cranes In Summer, Lindsey F. Mckinney, Jeb A. Barzen, Jason D. Riddle, Shelli A. Dubay, Tim F. Ginnett
Proceedings of the North American Crane Workshop
Abundance estimates allow wildlife managers to make informed management decisions, but differential detectability of individuals can lead to biased estimates of abundance. Our objective was to quantify detectability for non-territorial and territorial sandhill cranes (Grus canadensis tabida) during summer. We hypothesized that territorial sandhill cranes would be detected more often than non-territorial cranes. In 2009, 3 wetland areas were surveyed 2 days per week during the nesting season near Briggsville, Wisconsin. We created capture histories for color-marked territorial (n = 52) and color-marked nonterritorial cranes (n = 23) and used the Huggins closed capture model in …
Historic And Recent Winter Sandhill Crane Distribution In California, Gary L. Ivey, Caroline P. Herziger, David A. Hardt, Gregory H. Golet
Historic And Recent Winter Sandhill Crane Distribution In California, Gary L. Ivey, Caroline P. Herziger, David A. Hardt, Gregory H. Golet
Proceedings of the North American Crane Workshop
Understanding the geographic distribution and long-term dynamics of winter foraging areas and night roost sites of sandhill cranes (Grus canadensis) is important to their conservation and management. We studied sandhill crane distribution in California’s Central Valley from December 2012 through February 2013. We mapped observed flock and night roost locations. Flock locations occurred between Tehama County in the north and Kern County in the south. Flocks were concentrated in the northern Sacramento Valley, the Sacramento-San Joaquin Delta, the northern San Joaquin Valley south of Tracy to Mendota (including the lower Stanislaus and Tuolumne River floodplains and the Grasslands …
Rural Inhabitant Perceptions Of Sandhill Cranes In Northern Mexico Wintering Areas, Ingrid Barceló,, Julia Rivera López, Felipe Chávez-Ramírez
Rural Inhabitant Perceptions Of Sandhill Cranes In Northern Mexico Wintering Areas, Ingrid Barceló,, Julia Rivera López, Felipe Chávez-Ramírez
Proceedings of the North American Crane Workshop
While a large proportion of the sandhill crane (Grus canadensis) population winters in northern Mexico, little information is available regarding conservation status of wetlands and human dimension issues. We conducted preliminary interviews of rural inhabitants living near wetlands used by cranes in 3 Mexican estates. One hundred percent of interviewees affirmed to know cranes, see them regularly (100%), and were capable of describing cranes. Winter is the time most have seen cranes (78%) with fall being second (20%). Most cranes were observed in lakes (56%), agriculture fields (35%), and cattle troughs (2%). Most responded to have seen 0-100 …
Winter Distribution Of Greater Sandhill Cranes Marked At Breeding Areas In California, Oregon, And Washington, Gary L. Ivey, Joseph D. Engler, Martin J. St. Louis, Mark A. Stern, Sean Cross
Winter Distribution Of Greater Sandhill Cranes Marked At Breeding Areas In California, Oregon, And Washington, Gary L. Ivey, Joseph D. Engler, Martin J. St. Louis, Mark A. Stern, Sean Cross
Proceedings of the North American Crane Workshop
Large numbers of greater sandhill cranes (Grus canadensis tabida) have been banded and color-marked at several important breeding sites in the western U.S. since the late 1960s. Crane color-marking began in the late 1960s at Malheur National Wildlife Refuge (NWR) in eastern Oregon. Crane marking programs were initiated at Sycan Marsh, Summer Lake Wildlife Area (both in south-central Oregon), as well as at Modoc NWR in the mid-1980s. In the mid-1990s, a marking program was initiated at Conboy Lake NWR in south-central Washington. This paper reviews winter records and distribution of marked birds from these sites within the …
Influence Of Landscape Features Of Wetlands On Nesting Patterns Of Sandhill Cranes In Central Wisconsin, Su Liying, Anne E. Lacy, Jeb A. Barzen
Influence Of Landscape Features Of Wetlands On Nesting Patterns Of Sandhill Cranes In Central Wisconsin, Su Liying, Anne E. Lacy, Jeb A. Barzen
Proceedings of the North American Crane Workshop
We studied the relationship between landscape features and nesting patterns of greater sandhill cranes (Grus canadensis tabida) in central Wisconsin for 3 years. Our study covered 9,840 ha, including about 50% agricultural fields, 20% forest, and 20% wetlands. We analyzed landscape features and nesting patterns at the wetland complex level. Landscape features included size, shape, and type of cover for each wetland complex. Nesting patterns included nesting density and the spatial pattern of the nest locations in a wetland among years. Nest density varied among wetland complexes and years. Mean nest densities in wetlands surveyed were 0.037, 0.033, …
Preliminary Wintering Counts And New Locations Of Sandhill Cranes In Mexico, Ingrid Barceló, Edgar G. López, Felipe Chávez-Ramírez
Preliminary Wintering Counts And New Locations Of Sandhill Cranes In Mexico, Ingrid Barceló, Edgar G. López, Felipe Chávez-Ramírez
Proceedings of the North American Crane Workshop
Sandhill cranes (Grus canadensis) undertake a migration twice a year, when more than 400,000 cranes cross the United States from the Arctic of North America and Eastern Siberia to the southwest U.S. and north central Mexico. Although the sandhill crane has been studied intensely, few studies have been done on their Mexican wintering grounds. Little is known about what proportion of the sandhill crane population migrates to Mexico, and there is even less information regarding its dispersion. During winter 2007-2008 we surveyed 30 wetlands in the Chihuahuan Desert ecoregion in northern Mexico, recording presence/absence and number of sandhill …
Evaluating Chemical Deterrence At Two Spatial Scales: The Effectiveness Of Chemical Deterrence For Sandhill Cranes In Cornfields, Anne E. Lacy, Jeb A. Barzen
Evaluating Chemical Deterrence At Two Spatial Scales: The Effectiveness Of Chemical Deterrence For Sandhill Cranes In Cornfields, Anne E. Lacy, Jeb A. Barzen
Proceedings of the North American Crane Workshop
From 2006 through 2008, 9,10 anthraquinone (sold as Avitec™) was used as a deterrent on planted corn seed in Minnesota, Wisconsin, and Michigan. ICF conducted field trials in Wisconsin to determine efficacy of Avitec™ to repel sandhill cranes (Grus canadensis) from germinating corn. We assessed crane use at 2 levels: between and within habitats by crane population surveys to determine crane use of fields, and corn density surveys to assess possible damage within fields. In addition, corn seed samples were taken to assess amount of active ingredient on treated corn seeds in the ground. In 2008 the concentrations …
Sandhill Crane Staging And Whooping Crane Migratory Stopover Dynamics In Response To River Management Activities On The Central Platte River, Nebraska, Usa, Felipe Chavez-Ramirez
Sandhill Crane Staging And Whooping Crane Migratory Stopover Dynamics In Response To River Management Activities On The Central Platte River, Nebraska, Usa, Felipe Chavez-Ramirez
Proceedings of the North American Crane Workshop
The Central Platte River Valley (CPRV) is a critical stopover for migrating whooping cranes (Grus americana) and the most important staging area for sandhill cranes (G. canadensis) in North America. Due to reduced water flows caused by human activities, the Platte River no longer follows its traditional hydrograph which consisted of high spring flows that produced scouring action that eliminated vegetation. To provide adequate crane roosting habitat during stopover and staging periods, annual and woody vegetation has been mechanically cleared on eastern portions of the CPRV since 1980. Staging sandhill crane riverine roosting area has decreased …
Evaluating Propagation Method Performance Over Time With Bayesian Updating: An Application To Incubator Testing, Sarah J. Converse, Jane N. Chandler, Glenn H. Olsen, Charles C. Shafer
Evaluating Propagation Method Performance Over Time With Bayesian Updating: An Application To Incubator Testing, Sarah J. Converse, Jane N. Chandler, Glenn H. Olsen, Charles C. Shafer
Proceedings of the North American Crane Workshop
In captive-rearing programs, small sample sizes can limit the quality of information on performance of propagation methods. Bayesian updating can be used to increase information on method performance over time. We demonstrate an application to incubator testing at USGS Patuxent Wildlife Research Center. A new type of incubator was purchased for use in the whooping crane (Grus americana) propagation program, which produces birds for release. We tested the new incubator for reliability, using sandhill crane (Grus canadensis) eggs as surrogates. We determined that the new incubator should result in hatching rates no more than 5% lower …
Effects Of Changes In Agriculture And Abundance Of Snow Geese On Carrying Capacity Of Sandhill Cranes During Spring, Aaron T. Pearse, Gary L. Krapu, David A. Brandt
Effects Of Changes In Agriculture And Abundance Of Snow Geese On Carrying Capacity Of Sandhill Cranes During Spring, Aaron T. Pearse, Gary L. Krapu, David A. Brandt
Proceedings of the North American Crane Workshop
The Central Platte River Valley (CPRV) in Nebraska is a key spring staging area for approximately 80% of the midcontinent population of sandhill cranes (Grus canadensis). Evidence that cranes currently are acquiring fat less efficiently than in the past along with a large increase in use of the CPRVby snow geese (Chen caerulescens) led us to evaluate waste-corn availability and index spatial and temporal variation in abundance of sandhill cranes and waterfowl using the CPRV. We also developed a predictive model to assess impact of changes in availability of corn under past, present, and potential future conditions. Predicted …
Longevity Records Of Rocky Mountain Greater Sandhill Cranes Banded During 1969–1987 In Idaho, Montana, Utah, And Wyoming, Roderick C. Drewien, Wendy M. Brown, Kent R. Clegg
Longevity Records Of Rocky Mountain Greater Sandhill Cranes Banded During 1969–1987 In Idaho, Montana, Utah, And Wyoming, Roderick C. Drewien, Wendy M. Brown, Kent R. Clegg
Proceedings of the North American Crane Workshop
Cranes species throughout the world are renowned for their longevity; however, most records are based on individuals in captivity. We compiled longevity records for wild Rocky Mountain greater sandhill cranes (Grus canadensis tabida) banded in Idaho, Montana, Utah, and Wyoming during 1969-1987. Our analysis was based on over 180 band recoveries and over 1,700 visual observations of known-age individually marked birds from 1969 to 2008. We present only those birds of age >20 years for this summary. Our results yielded 56 birds known to be >20 yrs of age when killed or last observed. Of 7 band recoveries, …
First Breeding Records And Historical Status Of Sandhill Cranes In New England, Scott M. Melvin
First Breeding Records And Historical Status Of Sandhill Cranes In New England, Scott M. Melvin
Proceedings of the North American Crane Workshop
Sandhill cranes (Grus canadensis) nested at 4 sites in south-central Maine between 2000 and 2008 and at single sites in western Massachusetts and west-central Vermont in 2007 and 2008, continuing their eastward range expansion. Of 13 nests observed, 5 were in a lacustrine marsh, 2 were in a riverine marsh, and 2 were in beaver-impounded palustrine marshes, all dominated by cattail (Typha spp.); 2 were in lacustrine fen habitat dominated by sedges (Carex spp.), sphagnum, and leatherleaf (Chamaedaphne calyculata); 1 was in a lacustrine fen dominated by slender sedge (Carex lasiocarpa …
Countability Of Sandhill Cranes In Aerial Surveys, Douglas H. Johnson, John W. Solberg, Courtney L. Amundson
Countability Of Sandhill Cranes In Aerial Surveys, Douglas H. Johnson, John W. Solberg, Courtney L. Amundson
Proceedings of the North American Crane Workshop
Aerial surveys are used to monitor populations of many wildlife species, including sandhill cranes (Grus canadensis). In addition to the usual problems of detectability (involving both availability and perceptibility), aerial surveys of concentrated animals are subject to countability issues; from a rapidly moving aircraft, observers cannot count or accurately estimate the number of animals in a large group. Calibration is sometimes performed in an effort to adjust aerial counts for incomplete detectability and countability by calculating the ratio of animals actually in a group to the number in the group estimated from the aircraft. Here we explore alternative, …
Wintering Sandhill Crane Distribution And Habitat Use Patterns At Bosque Del Apache National Wildlife Refuge, New Mexico, Tandi L. Perkins, Leigh H. Fredrickson
Wintering Sandhill Crane Distribution And Habitat Use Patterns At Bosque Del Apache National Wildlife Refuge, New Mexico, Tandi L. Perkins, Leigh H. Fredrickson
Proceedings of the North American Crane Workshop
The single most important factor regulating sandhill crane (Grus canadensis) populations is their ability to carry out annual life cycle events while responding to changing habitat availability and distribution across local, regional, and continental landscapes. Wetland and cropland resource availability and distribution across the landscape have become increasingly unpredictable. Recent changes in farming practices, urbanization, and prevailing drought conditions in New Mexico have transformed and reduced dynamic, heterogeneous landscapes into scattered fragments of the original setting. Concerns are increasing for the cumulative influence of these often irreversible actions in providing the type of resources needed by cranes at …
New Hunter Education Strategies To Protect Whooping Cranes In Texas And Kansas, Lee Ann Johnson Linam, Helen M. Hands, Jay Roberson
New Hunter Education Strategies To Protect Whooping Cranes In Texas And Kansas, Lee Ann Johnson Linam, Helen M. Hands, Jay Roberson
Proceedings of the North American Crane Workshop
The decline of the whooping crane (Grus americana) has often been attributed primarily to loss of habitat and overharvest. Although hunting of whooping cranes is now prohibited, shootings sometimes occur. Recent incidences have prompted the Texas Parks and Wildlife Department (Texas) and the Kansas Department of Wildlife and Parks (Kansas) to develop new strategies that increase hunter recognition of legal game species and awareness of endangered species concerns. Both agencies have produced or updated publications for goose and sandhill crane (Grus canadensis) hunters. Texas has developed video news releases for the general public and a video/DVD …
Is The Annual March Survey Of The Midcontinental Sandhill Crane Population Appropriately Timed To Reliably Estimate Population Size?, Gary L. Krapu, David A. Brandt
Is The Annual March Survey Of The Midcontinental Sandhill Crane Population Appropriately Timed To Reliably Estimate Population Size?, Gary L. Krapu, David A. Brandt
Proceedings of the North American Crane Workshop
The U.S. Fish and Wildlife Service relies on an annual aerial photo-corrected survey conducted on the fourth Tuesday of March each year in the Central Platte River Valley (CPRV) and North Platte River Valley (NPRV) of Nebraska to estimate size of the midcontinental population (MCP) of sandhill cranes (Grus canadensis) to help guide population management. Wide unaccounted for annual fluctuations in survey counts over the past 25 years have raised concerns that many cranes either have left the Platte before the survey, have not yet arrived, or over fly the Platte entirely in some years. As a result, …
Infectious Bursal Disease In Wild Populations Of Turkeys And Sandhill Cranes: Preliminary Findings, Kristen L. Candelora, Marilyn G. Spalding, Stephen A. Nesbitt, Holly S. Sellers, Jeremy Olson, Larry Perrin, Jeannette Parker
Infectious Bursal Disease In Wild Populations Of Turkeys And Sandhill Cranes: Preliminary Findings, Kristen L. Candelora, Marilyn G. Spalding, Stephen A. Nesbitt, Holly S. Sellers, Jeremy Olson, Larry Perrin, Jeannette Parker
Proceedings of the North American Crane Workshop
Captive-reared whooping cranes (Grus americana) released into Florida for the resident reintroduction project experienced unusually high mortality and morbidity during the 1997-1998 and 2001-2002 release seasons (Spalding et al. 2008). Infectious bursal disease virus (IBDV) serotype 2 is currently under investigation as the factor that precipitated the mortality events. A small percentage of whooping cranes have been exposed to IBDV in the captive setting. However, many more are being exposed postrelease, and prevalence of exposure seems to increase with age or length of time the birds are in the wild in Florida (Spalding et al. 2008). The goals …