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Articles 4411 - 4440 of 6307

Full-Text Articles in Terrestrial and Aquatic Ecology

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 Jan 2010

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 …

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Video Surveillance Of Nesting Whooping Cranes, Timothy A. Dellinger, Martin J. Folk Jan 2010

Video Surveillance Of Nesting Whooping Cranes, Timothy A. Dellinger, Martin J. Folk

Proceedings of the North American Crane Workshop

The primary objective of the whooping crane (Grus americana) recovery plan is to establish and maintain 3 selfsustaining wild populations, 1 being a non-migratory Florida population. From 1993 to 2005, we released 289 captive cranes in central Florida, with 31 surviving as of 1 June 2008. From 1995 to 2008 we monitored 68 nests of the Florida population; from those, only 32 chicks hatched and 9 fledged. It often was not apparent why nests failed, and it was not practical to conduct labor-intensive observations at nests; therefore, we collected behavioral data using 12-volt VHS video surveillance cameras at …

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Assessing Sandhill Crane Flight Alterations To Power Lines In Southcentral Wisconsin, Kimberly H. Ness, Anne E. Lacy Jan 2010

Assessing Sandhill Crane Flight Alterations To Power Lines In Southcentral Wisconsin, Kimberly H. Ness, Anne E. Lacy

Proceedings of the North American Crane Workshop

We examined how weather and power line type affected abrupt flight alterations of sandhill cranes (Grus canadensis tabida) near electric lines in south-central Wisconsin at 4 U.S. Fish and Wildlife Service fall crane roost count sites near the Wisconsin River in Adams, Columbia, and Iowa counties between September and November 2007. We selected 4 distribution (10-12 m tall, <50 kV) and 2 transmission lines (>20 m tall, >110 kV) in high crane density areas near corn fields within 1.6 km of either the Wisconsin River or local roosting wetland. We recorded frequencies of 3 types of abrupt flight alterations near power lines across 1-2 …

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Mississippi Sandhill Crane Chicks Produced From Cryopreserved Semen, Anahid M. Pahlawanian, Megan L. Savoie, Vanessa Peery, Betsy L. Dresser, S. P. Leibo Jan 2010

Mississippi Sandhill Crane Chicks Produced From Cryopreserved Semen, Anahid M. Pahlawanian, Megan L. Savoie, Vanessa Peery, Betsy L. Dresser, S. P. Leibo

Proceedings of the North American Crane Workshop

The Mississippi sandhill crane (MSC, Grus canadensis pulla), 1 of 6 subspecies of sandhill cranes, is classified as critically endangered and was placed on the United States' List of Endangered Fish and Wildlife in 1973. For 13 years starting in 1996, the Audubon Center for Research of Endangered Species (ACRES) and Freeport-McMoran Species Survival Center (SSC) in New Orleans have been contributing to the MSC Recovery Program. Through successful captive propagation of MSCs by use of natural breeding and artificial insemination, more than 150 chicks raised at SSC have been released into the wild population at the MSC National …

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The Effects Of Anticoagulant Choice And Sample Processing Time On Hematologic Values Of Juvenile Whooping Cranes, Joan Maurer, Betsy Reichenberg, Cristin Kelley, Barry K. Hartup Jan 2010

The Effects Of Anticoagulant Choice And Sample Processing Time On Hematologic Values Of Juvenile Whooping Cranes, Joan Maurer, Betsy Reichenberg, Cristin Kelley, Barry K. Hartup

Proceedings of the North American Crane Workshop

Blood collected from juvenile whooping cranes (Grus americana) in 2007 and 2008 was divided and placed in either the anticoagulant lithium heparin (LiHep) or tri-potassium ethylenediaminetetraacetic acid (K3EDTA) for diagnostic hematology. Thin smears were prepared from the anticoagulated blood in the field with no delay and in the laboratory after a 4-6-hour delay, and then used to determine differential and total leukocyte counts. Manual heterophil and eosinophil counts were greater in LiHep-treated samples compared to K3EDTA samples (P < 0.05), but there was no difference in the total leukocyte concentration or differential leukocyte counts between anticoagulants based on blood smears prepared with no delay (n = 15). Marked differences were noted in relative heterophil (P < 0.05) and lymphocyte (P < 0.05) counts and total leukocyte (P < 0.05) concentrations of K3EDTA-treated samples processed after the delay (n = 7), suggesting a negative effect on lymphocyte integrity from the anticoagulant. Microscopically, lymphocytes were more intact and easily differentiated from thrombocytes in LiHep-treated samples than K3EDTA, but modest thrombocyte clumping in the LiHep samples was a concern. Either anticoagulant appears adequate for diagnostic hematology in juvenile whooping cranes based on this limited analysis, but blood smears should be prepared immediately under controlled conditions for best results.

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Reproductive Health And Performance Of The Florida Flock Of Introduced Whooping Cranes, Marilyn G. Spalding, Martin J. Folk, Stephen A. Nesbitt, Richard Kiltie Jan 2010

Reproductive Health And Performance Of The Florida Flock Of Introduced Whooping Cranes, Marilyn G. Spalding, Martin J. Folk, Stephen A. Nesbitt, Richard Kiltie

Proceedings of the North American Crane Workshop

We retrospectively examined the reproductive parameters of 122 breeding-age whooping cranes (Grus americana) in a reintroduced flock in central Florida from 1992 to 2007. The flock performed poorly when compared with an existing wild flock for all reproductive parameters when controlled for age. Pairs first formed in 1995, nested in 1999, and the first chick fledged in 2002. By 2007, 19 of 63 clutches produced 25 chicks, 9 of which fledged. Drought conditions were ruled out as the sole cause of failure when the drought lessened and productivity increased, but not in all years. We examined adult health, …

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A Retrospective Of Whooping Cranes In Captivity, Cindi Barrett, Thomas V. Stehn Jan 2010

A Retrospective Of Whooping Cranes In Captivity, Cindi Barrett, Thomas V. Stehn

Proceedings of the North American Crane Workshop

Early records of captive whooping cranes (Grus americana) were compiled from historical files kept at the Aransas National Wildlife Refuge and other literature. Additional early records of captive whooping cranes in Europe were discovered. Annual numbers and location for all captive whooping cranes were tabulated. Starting in 1949, initial attempts at breeding the species in captivity were conducted opportunistically with a few injured birds captured from the wild. Acaptive breeding flock was started in 1966 at the Patuxent Wildlife Research Center in Laurel, Maryland, from second eggs collected in Canada from the only remaining wild flock. In 1989, the flock …

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Changes In Winter Whooping Crane Territories And Range 1950–2006, Thomas V. Stehn, Felipe Prieto Jan 2010

Changes In Winter Whooping Crane Territories And Range 1950–2006, Thomas V. Stehn, Felipe Prieto

Proceedings of the North American Crane Workshop

The whooping crane (Grus americana) winters on the Texas coast primarily in salt marsh habitat. The location of adult whooping crane winter territories during 9 winters between 1950 and 2006 was derived from aerial census data digitized onto infrared photos using GIS software. Range expansion, including changes in distribution and size of winter territories, was analyzed over a 57-year period as flock size increased by 765%. Crane pairs have opted to establish territories in or close to the traditional winter area rather than moving long distances along the coast. This distribution seems based on the preference of the …

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Habitat Selection Of Eastern Migratory Whooping Cranes On Their Wintering Grounds, Lara E. A. Fondow, Stanley A. Temple Jan 2010

Habitat Selection Of Eastern Migratory Whooping Cranes On Their Wintering Grounds, Lara E. A. Fondow, Stanley A. Temple

Proceedings of the North American Crane Workshop

As a monitoring technician for the Whooping Crane Eastern Partnership, I (LEAF) noted that birds in years following release selected wintering habitats that differed greatly from those into which they were initially released. An analysis of the habitat preferences of these birds was needed in order to determine any possible implications to the reintroduction efforts. During the winters of 2004-2005 and 2005-2006, I recorded the locations, habitat use, social associations, and behaviors of all migratory whooping cranes (Grus americana) at known locations in Florida. I used compositional analysis to determine whether habitat use was random at the following …

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Observations Of Reproduction In Mountain Lions From Nebraska, Sam Wilson, Justin D. Hoffman, Hugh H. Genoways Jan 2010

Observations Of Reproduction In Mountain Lions From Nebraska, Sam Wilson, Justin D. Hoffman, Hugh H. Genoways

University of Nebraska State Museum: Mammalogy Papers

Occurrences of mountain lions (Puma concolor) in Nebraska have been steadily increasing; however, reproductive activity in mountain lions has not been documented in the state. We present the first evidence of mountain lion reproduction in Nebraska since mountain lions recolonized the state in the early 1990s. On 28 February 2007, a spotted kitten was hit by a vehicle in northwestern Nebraska; and based on body length and weight, we estimate its age at 3.9 months. On 20 December 2008, a female mountain lion and spotted kitten were photographed in the northwestern part of the state. On 9 May …

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Mammalian Nest Predation In Mississippi Sandhill Cranes, Rose Butler Jan 2010

Mammalian Nest Predation In Mississippi Sandhill Cranes, Rose Butler

Proceedings of the North American Crane Workshop

Low recruitment is the largest challenge facing the recovery of the critically endangered Mississippi sandhill crane (MSC, Grus canadensis pulla). Lack of information on nest predation and the impacts of specific nest predator species hinder effective management to lower nest predation rates. I have completed my first year of a 2-year research project on mammalian predation at the MSC National Wildlife Refuge in Gautier, Mississippi. I aim to identify common nest predators, determine if nest predation rates are higher in certain nesting habitats than others, and if different mammalian predators are more common in certain nesting habitats than others. …

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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 Jan 2010

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 …

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Whooping Crane Titers In Response To Eastern Equine Encephalitis Immunization, Glenn H. Olsen Jan 2010

Whooping Crane Titers In Response To Eastern Equine Encephalitis Immunization, Glenn H. Olsen

Proceedings of the North American Crane Workshop

Eastern equine encephalitis (EEE) is a viral disease caused by a vector-borne alphavirus. Various bird species, primarily native passerines in eastern North America, act as reservoir hosts without suffering clinical disease. When outbreaks occur, the disease is maintained and amplified through a mosquito-wild bird-mosquito cycle. EEE does not cause morbidity or mortality in North American passerines, but does cause mortality in some non-native birds such as pheasants (Phasianus colchicus) and emus (Dromiceius novaehollandiae) (Tengelsen et al. 2001) plus horses (Main 1979) and humans. Between September and December 1984, EEE killed 7 of 39 captive whooping cranes …

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Fall 2010, Nsu Oceanographic Center Jan 2010

Fall 2010, Nsu Oceanographic Center

Currents

No abstract provided.

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Environmental And Endogenous Factors Influencing Emigration In Juvenile Anadromous Alewives, Benjamin I. Gahagan, Eric T. Schultz, Katie E. Gherard Jan 2010

Environmental And Endogenous Factors Influencing Emigration In Juvenile Anadromous Alewives, Benjamin I. Gahagan, Eric T. Schultz, Katie E. Gherard

EEB Articles

We analyzed juvenile anadromous alewife migration at Bride Lake, a coastal lake in Connecticut, during summer 2006 and found that migration on 24-hour and seasonal timescales was influenced by conditions of the environment and characteristics of the individual. To identify environmental cues of juvenile migration, we continuously video recorded fish at the lake outflow and employed information-theoretic model selection to identify the best predictors of daily migration rate. More than 80% of the approximately 320,000 juveniles that migrated from mid-June to mid-August departed in three pulses lasting one or two days. Pulses of migration were associated with precipitation events, transient …

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Estimates Of Toad Headed Agama Density In Three Steppe Habitats Of Mongolia, James Murdoch, Buyandelger Suuri, Richard P. Reading Jan 2010

Estimates Of Toad Headed Agama Density In Three Steppe Habitats Of Mongolia, James Murdoch, Buyandelger Suuri, Richard P. Reading

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

The toad headed agama (Phrynocephalus versicolor) ranges across the arid steppe regions of southern and western Mongolia and represents one of the most common reptiles in the country. However, few details of the species’ population characteristics exist, which may be important for evaluating population trends and assessing its conservation status. We estimated toad headed agama density in Ikh Nart Nature Reserve, Mongolia based on surveys conducted in the summers (June-September) of 2005, 2006, 2008, and 2009. We conducted surveys in three steppe habitats including tall grassland (n = 7), shrub-steppe (n = 7), and semi-shrub steppe …

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Beitrag Zur Säugetierfauna Des Staatlichen Naturschutzgebietes Azas In Tyva/Südsibirien = Contributions To Fauna And Ecology Of Small Mammals Of State Nature Reserve “Azas” In The Republic Of Tyva /South Siberia, Annegret Stubbe, Michael Stubbe, V. V. Unžakov, A. P. Saveljev, N. I. Putincev, W. Stubbe Jan 2010

Beitrag Zur Säugetierfauna Des Staatlichen Naturschutzgebietes Azas In Tyva/Südsibirien = Contributions To Fauna And Ecology Of Small Mammals Of State Nature Reserve “Azas” In The Republic Of Tyva /South Siberia, Annegret Stubbe, Michael Stubbe, V. V. Unžakov, A. P. Saveljev, N. I. Putincev, W. Stubbe

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

During 1988-2004 Russian and German biologists carried out a research of biodiversity of the mountain taiga within the territory of State Nature Reserve “Azas” (Republic of Tyva/Russia). Along with executing the main task – studying and development of an aboriginal population of Tuvinian beavers Castor fiber tuvinicus – materials on the fauna of small mammals of the Todzha kettle were collected. On the basis of samples (about 550 collected micromammals) information on the occurrence, reproduction and morphometric characteristics of four species of Insectivora, six species of Chiroptera and eleven species of small Rodentia inhabiting the territory of the reserve “Azas” …

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Temporal Dynamics Of Group Size And Sexual Segregation In Ibex, N. J. Singh, S. Amgalanbaatar, Richard P. Reading Jan 2010

Temporal Dynamics Of Group Size And Sexual Segregation In Ibex, N. J. Singh, S. Amgalanbaatar, Richard P. Reading

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

Group size is an important variable describing behavioral ecology of animals. A variety of factors such as habitat characteristics, life history, spatio-temporal resource dynamics, population density, predation risk, competition with kin, and social learning often determine group size in large mammals. We studied temporal dynamics of group size in Siberian ibex (Capra sibirica) in a protected area in Mongolia. We measured monthly and yearly variations in typical group size and used the sexual segregation and aggregation statistic to assess sexual segregation. Ibex formed the largest groups in November and smallest groups in July. However, group sizes did not …

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Betr.: Schutz Des Wildesels/Kulans (Equus H. Hemionus) In Der Mongolei [Letter], Annegret Stubbe, Michael Stubbe Jan 2010

Betr.: Schutz Des Wildesels/Kulans (Equus H. Hemionus) In Der Mongolei [Letter], Annegret Stubbe, Michael Stubbe

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

Letter to R. Grube of Deutschen Bahn AG in Berlin, Germany, asking for dispensation as the authors attempted to relocate a herd of wild asses (Equus h. hemionus) from a site in Mongolia where they would in harm's way due to development.

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Current State Of Ixodidae Research In Mongolia, Daniel Kiefer, K. Pfister, D. Tserennorov, G. Bolormaa, D. Otgonbaatar, Ravčigijn Samjaa, E. G. Burmeister, Mathias S. Kiefer Jan 2010

Current State Of Ixodidae Research In Mongolia, Daniel Kiefer, K. Pfister, D. Tserennorov, G. Bolormaa, D. Otgonbaatar, Ravčigijn Samjaa, E. G. Burmeister, Mathias S. Kiefer

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

Our research presents the Ixodidae-fauna in Mongolia. The current taxonomic state in Mongolia shows 19 Ixodidae taxa extracted in 308 locations from 115 bird and mammal species. In 1980, the species Ixodes persulcatus SCHULZE, 1930 and Ixodes berlesei Birula, 1895 were detected in Inget Tolgoi and Ixodes laguri OLENEV, 1929 on Meriones unguiculatus 10 km southeast of Ulaanbaatar for the first time. In 2000 the species Haemaphysalis concinna Koch, 1844 was detected in the Selenge-river area and Argas (Argas) vulgaris FILIPPOVA, 1961 was detected in the Gobi area. From the collection of M. and A. STUBBE 1 N …

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The Influence Of Environmental Settings On The Distribution Of Invasive Species, David Bercaw, Nora Dougherty, William Sees Jan 2010

The Influence Of Environmental Settings On The Distribution Of Invasive Species, David Bercaw, Nora Dougherty, William Sees

Deer and Non-native Invasive Plant Impact Study Documents

No abstract provided.

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What Are The Causes, Consequences And Correctives Of Fish Contamination In The Detroit River Aoc That Cause Health Consumption Advisories? (Final Report, Michigan Sea Grant Michu-T-10-001), Donna R. Kashian, Ken G. Drouillard, D. Haffner, Ann E. Krause, Z Liu, Larissa Sano Jan 2010

What Are The Causes, Consequences And Correctives Of Fish Contamination In The Detroit River Aoc That Cause Health Consumption Advisories? (Final Report, Michigan Sea Grant Michu-T-10-001), Donna R. Kashian, Ken G. Drouillard, D. Haffner, Ann E. Krause, Z Liu, Larissa Sano

Environmental Science and Geology Faculty Research Publications

Using an Integrated Assessment (IA) framework, we consolidated and utilized existing data from the Detroit River to develop models that both identify possible drivers of elevated fish contaminant body burdens, and to facilitate a more risk-based approach of tissue trigger-levels for consumption advisories. This integrated assessment approach was particularly useful for consumption advisories as it provided the ability to integrate and organize complex data in a manner that can help inform management decisions. In addition, the IA framework explicitly fosters collaboration and participation of multiple interested groups. We have capitalized on this component of IAs, by seeking the active participation …

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Winter 2010, Nsu Oceanographic Center Jan 2010

Winter 2010, Nsu Oceanographic Center

Currents

No abstract provided.

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Thirty Years Of Mortality Assessment In Whooping Crane Reintroductions: Patterns And Implications, Barry K. Hartup, Marilyn G. Spalding, Nancy J. Thomas, Gretchen A. Cole, Young Jun Kim Jan 2010

Thirty Years Of Mortality Assessment In Whooping Crane Reintroductions: Patterns And Implications, Barry K. Hartup, Marilyn G. Spalding, Nancy J. Thomas, Gretchen A. Cole, Young Jun Kim

Proceedings of the North American Crane Workshop

We reviewed postmortem data to identify primary causes of mortality in reintroduced whooping cranes (Grus americana) and assess their potential for mitigation in future reintroduction efforts. In total, 240 cases from 3 populations were reviewed for causes of death, including the Rocky Mountain migratory population (n = 24, release dates 1975-1989), the Florida resident population (n = 186, 1993-2005), and the Wisconsin migratory population (n = 30, 2001-ongoing). Traumatic injury was the leading cause of mortality among the reintroduced whooping cranes, most commonly from predation (n = 120 or 50%, range 8-58% per project) or collision with fixed …

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Morbidity And Mortality Of Captive Whooping Cranes At The International Crane Foundation 1976–2008, Barry K. Hartup, Jennifer N. Niemuth, Bridget Fitzpatrick, Maureen Fox, Cristin Kelley Jan 2010

Morbidity And Mortality Of Captive Whooping Cranes At The International Crane Foundation 1976–2008, Barry K. Hartup, Jennifer N. Niemuth, Bridget Fitzpatrick, Maureen Fox, Cristin Kelley

Proceedings of the North American Crane Workshop

Tracking the incidence of morbidity and mortality in captive animal collections helps inform husbandry and preventive medicine programs aimed at improving population health and viability. Carpenter and Derrickson (1982) and Olsen et al. (1997) published summary reports of captive whooping crane (Grus americana) mortality that served to identify key problem areas for the primary breeding flock and potential reintroduction programs involving this endangered species. We expanded on this approach and conducted an initial evaluation of morbidity and mortality factors for whooping cranes at the International Crane Foundation (ICF). The purpose of our study was to identify overrepresented factors …

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Endoparasites Of Greater Sandhill Cranes In South-Central Wisconsin, Somer Hartman, Betsy Reichenberg, Jane Fanke, Anne E. Lacy, Barry K. Hartup Jan 2010

Endoparasites Of Greater Sandhill Cranes In South-Central Wisconsin, Somer Hartman, Betsy Reichenberg, Jane Fanke, Anne E. Lacy, Barry K. Hartup

Proceedings of the North American Crane Workshop

Windingstad and Trainer (1977) used both fecal sampling and postmortem examinations to document the occurrence of parasites in greater sandhill cranes (Grus canadensis tabida) from Wisconsin in the fall. We conducted repeated fecal sampling of a well-known population to expand on results of their study. Our objective was to determine whether seasonal differences exist in the prevalence of endoparasites of Wisconsin sandhill cranes. We collected 7 to 10 fecal samples approximately every other week from a consistent roost site on the Wisconsin River (43°34'52.99''N, 89°36'38.42''W) near Briggsville, Wisconsin, from 29 May through 25 September 2008. The sample size …

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Impacts Of Global And Regional Climate On Whooping Crane Demography: Trends And Extreme Events, Karine Gil, William Grant, R. Douglas Slack, Enrique Weir Jan 2010

Impacts Of Global And Regional Climate On Whooping Crane Demography: Trends And Extreme Events, Karine Gil, William Grant, R. Douglas Slack, Enrique Weir

Proceedings of the North American Crane Workshop

We analyzed long-term demographic and environmental data to understand the role of large scale climatic factors (the Pacific Decadal Oscillations [PDO]) and environmental factors in 3 regions of North America on natality and mortality of the remnant migratory whooping crane (Grus americana) population. This is an endangered species that spends winters at Aransas National Wildlife Refuge (ANWR) in Texas, breeds at Wood Buffalo National Park (WBNP) in Canada and “…uses Nebraska as a primary stopover”. Long term data (27 years) of demography and environmental factors (PDO index, temperature and precipitation at WBNP, Nebraska and ANWR, pond water depth …

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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 Jan 2010

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, …

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Demography Of Whooping Cranes In The Eastern Migratory Population, Sarah J. Converse, Richard P. Urbanek Jan 2010

Demography Of Whooping Cranes In The Eastern Migratory Population, Sarah J. Converse, Richard P. Urbanek

Proceedings of the North American Crane Workshop

The ultimate success of the whooping crane (Grus americana) reintroduction to eastern North America rests on adequate demographic performance of the population. We are undertaking a population viability analysis (PVA) of the eastern migratory population in order to evaluate progress toward the fundamental population objective, to better understand the critical demographic thresholds that must be met to fulfill this objective, and, most importantly, to support management decision-making. The initial phase in the PVA development process involves estimation of demographic parameters to be used in later population modeling phases. Multi-state models provide an appropriate analytic framework for estimation, wherein …

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Current Status Of Lesser Sandhill Cranes In Yakutia, Inga Bysykatova, Sergey Sleptsov, Nikolay Vasiliev Jan 2010

Current Status Of Lesser Sandhill Cranes In Yakutia, Inga Bysykatova, Sergey Sleptsov, Nikolay Vasiliev

Proceedings of the North American Crane Workshop

In Yakutia, the sandhill crane (Grus canadensis canadensis) was considered a common bird in 1957 on the Primorie tundra from the Kolyma River to the Alazeya River. In 1980 the area of the species’ supposed breeding grounds within the Kolyma- Indigirka interfluve comprised 34,600 km2. In 1984-85, the breeding grounds extended west to the Sundrun River, with the total area reaching 49,400 km2. At present, the westernmost sandhill crane range is on the tundra along the lower reaches of the Berelekh River. This region joins the higher density Siberian crane (G. leucogeranus) range, so that the …

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