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Articles 271 - 300 of 703
Full-Text Articles in Population Biology
Annual Color Photo Section 2017, The Nebraska Bird Review
Annual Color Photo Section 2017, The Nebraska Bird Review
Nebraska Bird Review
For our color photo section this year we asked especially for photos of birds in unexpected places. The images on this page and the following two pages show birds in surprising locations or unusual geographic ranges.
32 images
Canyon Wren in wheel of the photographer’s Subaru at Mary Sue Shoemaker’s ranch in central Cherry Co, 20 Nov 2016. 5th record of this species for Nebraska. Photo by Joel Jorgensen.
Great Horned Owl at water feature in the photographer’s yard, Dixon Co., 18 April 2017. Photo by Jan Johnson.
Brambling, 4th record in Nebraska, coming to the feeders at the home …
Winter Field Report, December 2016 To February 2017, W. Ross Silcock
Winter Field Report, December 2016 To February 2017, W. Ross Silcock
Nebraska Bird Review
This was an interesting winter from several standpoints. The trend of unexpected winter occurrences and earlier arrivals in “spring” continued. Mid-winter records of several species were notable: Rock Wren, Marsh Wren, American Pipit, Pine Warbler, and Chipping Sparrow. Rarities (see below) that could be considered in this category as well were Golden-crowned Sparrow and Lesser Goldfinch. For earlier arrivals, there was a noticeable influx 14-18 Feb of various species that provided rather early dates for those species. In this group were Blue-winged Teal, Ruddy Duck, Double-crested Cormorant, American White Pelican, and Turkey Vulture.
Some amazing numbers were reported, including a …
Brambling In Bellevue, Sarpy County, Loren Padelford, Babs Padelford
Brambling In Bellevue, Sarpy County, Loren Padelford, Babs Padelford
Nebraska Bird Review
As we were having breakfast on January 8, 2017, we spotted an unusuallooking bird with House Sparrows in the tree above our deck. After consulting the National Geographic field guide, we determined it was a Brambling. Soon it was feeding on the deck where we were able to get some photos. It was first spotted at 9:25 a.m. and again at 10:30. We put the information on NEBirds and by late morning birders began to arrive.The first group saw the bird at 12:02. By early afternoon we had standing room only in our family room. The bird appeared again at …
Distribution, Abundance, And Migration Timing Of Greater And Lesser Sandhill Cranes Wintering In The Sacramento–San Joaquin River Delta Region Of California, Gary L. Ivey, Bruce D. Dugger, Caroline P. Herziger, Michael L. Casazza, Joseph P. Fleskes
Distribution, Abundance, And Migration Timing Of Greater And Lesser Sandhill Cranes Wintering In The Sacramento–San Joaquin River Delta Region 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 River Delta region of California (hereafter, Delta region) is an important wintering region for the Central Valley Population of greater sandhill cranes (Grus canadensis tabida) and lesser sandhill cranes (G. c. canadensis), but basic information about the ecology of these birds is lacking to design a biologically sound conservation strategy. During the winters of 2007-08 and 2008-09, we conducted roost counts, roadside surveys, aerial surveys, and tracked radio-marked birds to define the geographic area used by sandhill cranes in the Delta region, document migration chronology, and estimate subspecies-specific abundance. Radio-marked sandhill cranes arrived in our study area …
Using Citizen Science And Remote Sensing Data To Model Hummingbird Migration, Sarah R. Supp, Laura J. Graham, Frank A. La Sorte, Tina A. Cormier, Gil Bohrer, Donald Powers, Susan Wethington, Kevin Guay, Patrick Jantz, Scott Goetz, Catherine H. Graham
Using Citizen Science And Remote Sensing Data To Model Hummingbird Migration, Sarah R. Supp, Laura J. Graham, Frank A. La Sorte, Tina A. Cormier, Gil Bohrer, Donald Powers, Susan Wethington, Kevin Guay, Patrick Jantz, Scott Goetz, Catherine H. Graham
Annual Symposium on Biomathematics and Ecology Education and Research
No abstract provided.
Uncommon/Rare Avian Species Decline And Extirpation In Nested Assemblages Of Northeastern Illinois Wetlands, James M. Mcaley
Uncommon/Rare Avian Species Decline And Extirpation In Nested Assemblages Of Northeastern Illinois Wetlands, James M. Mcaley
All Capstone Projects
Baisa found that avian assemblages are highly nested in palustrine emergent wetlands in northeastern Illinois. He measured nestedness by constructing a binary matrix of species presence and absence across sites. Nestedness was also quantified using the Mann-Whitney U-test in his study.
The goal of this project was to sample the wetlands as Baisa had done in his study. By doing so, we will have 2 sampling events, approximately 10 years apart. Nestedness of the wetland communities will be checked, and data compared to that of Baisa. Emergent wetlands in northeastern Illinois were found by Baisa to contain highly nested avian …
Earlier Nesting By A Predatory Bird Is Associated With Human Adaptations To Climate Change, Shawn Heath Smith
Earlier Nesting By A Predatory Bird Is Associated With Human Adaptations To Climate Change, Shawn Heath Smith
Boise State University Theses and Dissertations
Advancing growing seasons and prey abundance drive earlier breeding in dietary specialists because, ultimately, consumers benefit by timing their reproduction to coincide with peak prey abundance. The selective pressure to breed earlier may be lower for species that forage on diverse prey items that vary in abundance both spatially and temporally. The selective pressure may be reduced further if predators have access to a mosaic of habitats, each of which having different shifts in growing seasons. We studied whether earlier breeding of a predatory generalist, the American kestrel (Falco sparverius) nesting in a mosaic of habitat types was …
The Maintenance Of Phenotypic Divergence Through Sexual Selection: An Experimental Study In Barn Swallows Hirundo Rustica, Rebecca Safran, Yoni Vortman, Brittany R. Jenkins, Joanna K. Hubbard, Matt Wilkins, Rachel J. Bradley, Arnon Lotem
The Maintenance Of Phenotypic Divergence Through Sexual Selection: An Experimental Study In Barn Swallows Hirundo Rustica, Rebecca Safran, Yoni Vortman, Brittany R. Jenkins, Joanna K. Hubbard, Matt Wilkins, Rachel J. Bradley, Arnon Lotem
School of Biological Sciences: Faculty Publications
Previous studies have shown that sexual signals can rapidly diverge among closely related species. However, we lack experimental studies to demonstrate that differences in trait-associated reproductive performance maintain sexual trait differences between closely related populations, in support for a role of sexual selection in speciation. Populations of Northern Hemisphere distributed barn swallows Hirundo rustica are closely related, yet differ in two plumage-based traits: ventral color and length of the outermost tail feathers (streamers). Here we provide experimental evidence that manipulations of these traits result in different reproductive consequences in two subspecies of barn swallow: (H. r. erythrogaster in North …
The North American Grouse: Their Biology And Behavior, Paul A. Johnsgard
The North American Grouse: Their Biology And Behavior, Paul A. Johnsgard
Zea E-Books Collection
The ten currently recognized species of grouse in North America have played an important role in America’s history, from the famous but ill-fated heath hen, a primary source of meat for the earliest New England immigrants, to the ruffed grouse, currently one of the most abundant and soughtafter upland game birds in more than 40 states and provinces. This book summarizes the ecology, reproductive biology, and social behavior of all ten of the extant North American grouse species. It also describes the current status of grouse populations, some of which are perilously close to extinction. The social behavior of grouse …
Population And Morphological Changes In American Kestrels Through Space And Time, Teresa E. Ely
Population And Morphological Changes In American Kestrels Through Space And Time, Teresa E. Ely
School of Biological Sciences: Dissertations, Theses, and Student Research
A once common raptor, the American kestrel (Falco sparverius) has experienced population declines in the last two decades throughout North America. Many hypotheses exist about the decline, including mortality from West Nile virus, rodenticide poisoning, climate change, an increase in predators, and core habitat loss or degradation, which could influence food availability. Food availability is key to raptor survival and reproduction, and changes in food availability throughout the year can have lifelong effects on size and body condition. Here we examine how morphology, specifically mass and wing chord, has changed at seven migration sites throughout North America as …
Swans: Their Biology And Natural History, Paul A. Johnsgard
Swans: Their Biology And Natural History, Paul A. Johnsgard
Zea E-Books Collection
The seven species of swans of the world are an easily and universally recognized group of waterfowl, which have historically played important roles in the folklore, myths and legends in many of the world’s cultures. Among the largest of all flying birds, they have also almost universally been used as symbols of royalty, grace and beauty, and largely for these reasons swans have only rarely been considered acceptable as targets for sport hunting. Swans occur on all the continents except Africa, although most species are associated with the temperate and arctic zones of North America and Eurasia. Among birds, swans …
An Update On Mortality Of Fledged Whooping Cranes In The Aransas/Wood Buffalo Population, Thomas V. Stehn, Carey L. Haralson-Strobel
An Update On Mortality Of Fledged Whooping Cranes In The Aransas/Wood Buffalo Population, Thomas V. Stehn, Carey L. Haralson-Strobel
Proceedings of the North American Crane Workshop
From winter 1950 through spring 2011, 6,364 whooping cranes (Grus americana) overwintered at Aransas National Wildlife Refuge, or rarely, elsewhere. Documented winter losses amounted to 105 birds dead or disappeared. About 20% of total losses occurred in the wintering area, where birds spend 5 to 6 months of the year including a few birds that over-summer. Losses of white-plumaged whooping cranes on the summering area in Canada appear to be low with only 3 instances documented. The most significant losses seem to occur in migration and may comprise over 80% of the annual mortality. Migration involves only 17-20% of the …
Use Of Freshwater Ponds By Whooping Cranes During A Drought Period, Karis Ritenour, Elizabeth Smith, Barry K. Hartup
Use Of Freshwater Ponds By Whooping Cranes During A Drought Period, Karis Ritenour, Elizabeth Smith, Barry K. Hartup
Proceedings of the North American Crane Workshop
Whooping cranes (Grus americana) spend nearly half their annual cycle in coastal habitats within and around the Aransas National Wildlife Refuge Complex (ANWRC) located in the central portion of the Texas Coast. When drought conditions prevail in their winter range and salinities in the local bays exceed 23 parts per thousand (ppt), whooping cranes must seek alternate sources of dietary drinking water (Stehn 2008, Chavez- Ramirez and Wehtje 2012). They begin frequent (often daily) trips to freshwater sources in upland areas. These trips may result in extra energy expenditures that can impact their overall health and ability to …
Proceedings Of The Thirteenth North American Crane Workshop, Abstracts, David A. Aborn, Richard P. Urbanek
Proceedings Of The Thirteenth North American Crane Workshop, Abstracts, David A. Aborn, Richard P. Urbanek
Proceedings of the North American Crane Workshop
AGE-SPECIFIC SURVIVAL OF GREATER SANDHILL CRANE COLTS IN NEVADA. Chad August, Jim Sedinger, and Chris Nicolai 111
WHOOPING CRANE DISTRIBUTION AND HABITAT USE: PAST, PRESENT, AND FUTURE? Jane Austin, Matthew Hayes, and Jeb Barzen 111
BEHAVIORAL MOVEMENTS OF ARANSAS-WOOD BUFFALO WHOOPING CRANES: ANOMALIES OR INDICATIONS OF WAYS TO FURTHER ENHANCE SPECIES RECOVERY. David Baasch, Mark Bidwell, Wade Harrell, Kris Metzger, Aaron Pearse, and Mary Harner 112
INFLUENCES ON NEST SUCCESS IN A REINTRODUCED POPULATION OF WHOOPING CRANES. Jeb Barzen, Sarah Converse, Peter Adler, Elmer Gray, Anne Lacy, Eva Szyszkoski, and Andrew Gossens 113
DETERMINING DIET COMPOSITION AND INGESTION RATE OF …
Size Difference In Whooping Cranes Reared For Two Reintroduction Methods, Richard P. Urbanek, Marianne M. Wellington, Sabrina Servanty
Size Difference In Whooping Cranes Reared For Two Reintroduction Methods, Richard P. Urbanek, Marianne M. Wellington, Sabrina Servanty
Proceedings of the North American Crane Workshop
We investigated a possible size difference in whooping cranes (Grus americana) captive-reared for 2 reintroduction methods to establish a migratory population in eastern North America. Cranes reared for ultralight aircraft-led migration (UL) to Florida were significantly larger than cranes reared for direct autumn release (DAR) on the natal area in central Wisconsin. Mean tarsal length was 315.5 ± 0.98 (1 SE) and 308.1 ± 1.87 mm, respectively, for UL and DAR males and 296.9 ± 1.03 and 290.8 ± 2.60 mm, respectively, for UL and DAR females. Because of the different rearing schedules, eggs for the DAR method …
Effects Of Wind Farms On Sand Hill Crane Play An Occupancy On The Texas High Plains, Laura Navarrete, Kerry L. Griffis-Kyle
Effects Of Wind Farms On Sand Hill Crane Play An Occupancy On The Texas High Plains, Laura Navarrete, Kerry L. Griffis-Kyle
Proceedings of the North American Crane Workshop
Wind energy is essential for a shift to carbon-emission free energy, however there has been very little research investigating the disturbance caused by wind farms on the landscape. Texas is a leading state in wind power capacity, and the High Plains of Texas support over 80% of the midcontinent population of sandhill cranes (Grus canadensis) every winter. Historically, cranes used saline lakes for fresh water and predator protection, but recent hydrological changes due to agricultural practices have reduced the availability of the lakes for wintering birds. Playa wetlands currently represent the main source of water and roosting habitat in the …
High Nest Density Of Sandhill Cranes In Central Wisconsin, Jeb A. Barzen, Liying Su, Anne E. Lacy, Andrew P. Gossens, Dorn M. Moore
High Nest Density Of Sandhill Cranes In Central Wisconsin, Jeb A. Barzen, Liying Su, Anne E. Lacy, Andrew P. Gossens, Dorn M. Moore
Proceedings of the North American Crane Workshop
We conducted aerial surveys to determine nest locations of greater sandhill cranes (Grus canadensis tabida) in central Wisconsin, 2001-2003. Helicopter flights covered 8.90 km2 of wetlands in each year, and we found 41 nests in 2001, 50 nests in 2002, and 48 nests in 2003 from 11 wetlands. Our best estimate of nest density (n = 14) included wetlands containing 5 or more nests and averaged 5.25 ± 0.36 (1 SE) nests/km2 of wetland. Maximum nest density of larger wetlands in any 1 year was 7.80 nests/km2. As some nests had likely failed by …
Evaluation Of A Nutraceutical Joint Supplement In Cranes, Kendra L. Bauer, Ellen S. Dierenfeld, Barry K. Hartup
Evaluation Of A Nutraceutical Joint Supplement In Cranes, Kendra L. Bauer, Ellen S. Dierenfeld, Barry K. Hartup
Proceedings of the North American Crane Workshop
Osteoarthritis is a problem that threatens the reproductive capabilities of captive populations of endangered cranes. In our pilot study, we used 5 cranes with a history of unilateral, chronic tarsal pathology in a cross-over design to gauge the effects of the primary ingredient (NEM®, ESM Technologies LLC, Carthage, MO) of the nutraceutical Steadfast® (Novus Nutrition Brands, LLC, St. Charles, MO). We evaluated the ingredient for acceptance, safety, and short-term efficacy. To evaluate efficacy, we collected goniometric measures to determine range of motion in each tarsal joint before and after a 5-week experimental period where NEM® was offered in pelleted feed. …
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 …
Serum Chemistry, Blood Gas, And Physiological Measures Of Sandhill Cranes Sedated With Alpha-Chloralose, Richard R. Sim, Barry K. Hartup
Serum Chemistry, Blood Gas, And Physiological Measures Of Sandhill Cranes Sedated With Alpha-Chloralose, Richard R. Sim, Barry K. Hartup
Proceedings of the North American Crane Workshop
Capture techniques that lessen handling stress may also lessen pathologic influences on physiologic measures, improving the validity of these measures for use in individual health assessment of freeranging wildlife. Since 1990, the International Crane Foundation (ICF) has successfully used chemical immobilization with alpha-chloralose (AC; C6H11Cl3O6), a chloral derivative of glucose, to facilitate captures of sandhill cranes (Grus canadensis tabida) for ecological studies (Hayes et al. 2003). Although this chemical has been used orally for the immobilization of many species, the physiologic effects of AC are not well understood in cranes. …
Tylosin Tartrate Promotes Resolution Of Insect Bite Hypersensitivity Reactions In Captive Cranes, Alina Kelman, Barry K. Hartup
Tylosin Tartrate Promotes Resolution Of Insect Bite Hypersensitivity Reactions In Captive Cranes, Alina Kelman, Barry K. Hartup
Proceedings of the North American Crane Workshop
Previous research has described significant serum protein electrophoretic changes associated with intense periocular swelling in several crane species, typical of Type I hypersensitivity reactions, and thought to be the result of insect bites (Hartup and Schroeder 2006). We reviewed medical records for treatment plans and outcomes from 58 cases of insect hypersensitivity reactions observed in a diverse collection of captive cranes at the International Crane Foundation, Baraboo, Wisconsin. The purpose of this study was to fully describe the epidemiological and clinical characteristics of these cases, and determine the efficacy of treatment of these cases with tylosin tartrate, a macrolide antibiotic. …
Timing Of Family Dissociation Does Not Affect Long-Term Survival Estimates Of Sandhill Crane Chicks, Matthew A. Hayes, Jeb A. Barzen
Timing Of Family Dissociation Does Not Affect Long-Term Survival Estimates Of Sandhill Crane Chicks, Matthew A. Hayes, Jeb A. Barzen
Proceedings of the North American Crane Workshop
Sandhill crane (Grus canadensis) chicks depend on their parents beyond fledging, but timing of chick separation from their parents has rarely been quantified and reported. We color-banded and radio-tagged sandhill crane chicks on known natal territories in south-central Wisconsin and monitored family groups to determine age of chick independence. Using a Cormack-Jolly-Seber open population model in program MARK, we estimated survival for chicks that dissociated from their parents prior to fall migration, over winter (including migration), and following spring migration. Of 96 chicks with a known timing of dissociation from their parents, 11 (12%) became independent from their …
Distribution, Densities, And Ecology Of Siberian Cranes In The Khroma River Region Of Northern Yakutia In Northeastern Russia, Inga P. Bysykatova, Gary L. Krapu, Nicolai I. Germogenov, Deborah A. Buhl
Distribution, Densities, And Ecology Of Siberian Cranes In The Khroma River Region Of Northern Yakutia In Northeastern Russia, Inga P. Bysykatova, Gary L. Krapu, Nicolai I. Germogenov, Deborah A. Buhl
Proceedings of the North American Crane Workshop
The Siberian crane (Grus leucogeranus) is the third rarest crane species in the world with a breeding range now centered on 3 core areas and a buffer zone in the arctic of northern Yakutia in northeastern Russia. During 16 July-2 August 2009, we undertook ground surveys within the Khroma River core breeding area, surrounding buffer zone, and lands lying to the west of the known breeding range to estimate densities and determine habitat use and social status of Siberian cranes. A total of 142 Siberian cranes were sighted (including 55 pairs) at 54 locations with 32 cranes (including 13 pairs) …
Proceedings Of The 13th North American Crane Workshop Abstracts
Proceedings Of The 13th North American Crane Workshop Abstracts
Proceedings of the North American Crane Workshop
AGE-SPECIFIC SURVIVAL OF GREATER SANDHILL CRANE COLTS IN NEVADA Chad August, Jim Sedinger, and Chris Nicolai 111
WHOOPING CRANE DISTRIBUTION AND HABITAT USE: PAST, PRESENT, AND FUTURE? Jane Austin, Matthew Hayes, and Jeb Barzen 111
BEHAVIORAL MOVEMENTS OF ARANSAS-WOOD BUFFALO WHOOPING CRANES: ANOMALIES OR INDICATIONS OF WAYS TO FURTHER ENHANCE SPECIES RECOVERY. David Baasch, Mark Bidwell, Wade Harrell, Kris Metzger, Aaron Pearse, and Mary Harner 112
ON NEST SUCCESS IN A REINTRODUCED POPULATION OF WHOOPING CRANES .Jeb Barzen, Sarah Converse, Peter Adler, Elmer Gray, Anne Lacy, Eva Szyszkoski, and Andrew Gossens 113
DETERMINING DIET COMPOSITION AND INGESTION RATE OF CRANES …
Proceedings Of The Thirteenth North American Crane Workshop, 14–17 April 2014, Lafayette, Louisiana, Usa, David A. Aborn, Richard P. Urbanek
Proceedings Of The Thirteenth North American Crane Workshop, 14–17 April 2014, Lafayette, Louisiana, Usa, David A. Aborn, Richard P. Urbanek
Proceedings of the North American Crane Workshop
RESEARCH PAPERS
HABITAT SELECTION BY BREEDING SANDHILL CRANES IN CENTRAL WISCONSIN. Tamara P. Miller and Jeb A. Barzen 1
HIGH NEST DENSITY OF SANDHILL CRANES IN CENTRAL WISCONSIN.Jeb A. Barzen, Liying Su, Anne E. Lacy, Andrew P. Gossens, and Dorn M. Moore 13
DIFFERENTIAL DETECTION OF TERRITORIAL AND NON-TERRITORIAL GREATER SANDHILL CRANES IN SUMMER. Lindsey F. McKinney, Jeb A. Barzen, Jason D. Riddle, Shelli A. Dubay, and Tim F. Ginnett 25
TIMING OF FAMILY DISSOCIATION DOES NOT AFFECT LONG-TERM SURVIVAL ESTIMATES OF SANDHILL CRANE CHICKS Matthew A. Hayes and Jeb A. Barzen 33
A REVIEW OF FALL SANDHILL CRANE MIGRATION …
Nesting Activity Budgets And Antipredator Behaviors Of Mississippi Sandhill Cranes, Jerome J. Howard, Rose Butler Wall, Lauren Billodeaux Mowbray, Scott G. Hereford
Nesting Activity Budgets And Antipredator Behaviors Of Mississippi Sandhill Cranes, Jerome J. Howard, Rose Butler Wall, Lauren Billodeaux Mowbray, Scott G. Hereford
Proceedings of the North American Crane Workshop
We studied activity budgets and antipredator behaviors of Mississippi sandhill cranes (Grus canadensis pulla) to determine if parental behavior influenced nest outcomes. We used infrared motion-activated cameras to capture behavioral sequences from 21 nests over a 2-year period. Overall activity budgets were similar among crane pairs regardless of nest outcome. Specific activity patterns did predict nest outcomes; pairs at unsuccessful nests spent more time away from the nest and more time manipulating nest contents than successful pairs, while pairs at nests that were lost to predation cooperated poorly and started the nest a month later on average than …
Characteristics Of Sandhill Crane Roosts In The Sacramento–San Joaquin Delta Of California, Gary L. Ivey, Bruce D. Dugger, Caroline P. Herziger, Michael L. Casazza, Joseph P. Fleskes
Characteristics Of Sandhill Crane Roosts In The Sacramento–San Joaquin 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 (Delta) region of California is an important wintering region for 2 subspecies of Pacific Flyway sandhill cranes (Grus canadensis): the Central Valley Population of the greater sandhill crane (G. c. tabida) and the Pacific Flyway Population of the lesser sandhill crane (G. c. canadensis). During the winters of 2007-08 and 2008-09 we conducted roost counts, roadside surveys, aerial surveys, and tracked radio-marked birds to locate and assess important habitats for roosting cranes in the Delta. Of the 69 crane night roosts we identified, 35 were flooded cropland sites and 34 were wetland sites. We found that …
Ten-Year Status Of The Eastern Migratory Whooping Crane Reintroduction, Richard P. Urbanek, Sara E. Zimorski, Eva K. Szyskoski, Marianne M. Wellington
Ten-Year Status Of The Eastern Migratory Whooping Crane Reintroduction, Richard P. Urbanek, Sara E. Zimorski, Eva K. Szyskoski, Marianne M. Wellington
Proceedings of the North American Crane Workshop
From 2001 to 2010, 132 costume-reared juvenile whooping cranes (Grus americana) were led by ultralight aircraft from Necedah National Wildlife Refuge (NWR) in central Wisconsin to the Gulf Coast of Florida on their first autumn migration (ultralight-led or UL), and 46 juveniles were released directly on Necedah NWR during autumn of the hatch year (direct autumn release or DAR). Return rate in spring was 90.5% for UL and 69.2% for DAR, the lower value of the latter attributable to 1 cohort with migration problems. Overall population survival 1 year and from 1 to 3 years post-release was 81% and 84%, …