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Population Status , Hunting Regulations , And Harvests Of The Rocky Mountain Population Of Greater Sandhill Cranes, 1981–2005, Kammie L. Kruse, David E. Sharp, James A. Dubovsky
Population Status , Hunting Regulations , And Harvests Of The Rocky Mountain Population Of Greater Sandhill Cranes, 1981–2005, Kammie L. Kruse, David E. Sharp, James A. Dubovsky
Proceedings of the North American Crane Workshop
The Rocky Mountain Population (RMP) of greater sandhill cranes (Grus canadensis tabida) was not hunted in the U.S. from 1916 until 1981, when Arizona initiated the first modern-day season. Hunting programs in the U.S. were subsequently expanded to 6 states for the RMP and have been guided by a cooperative flyway management plan, including a harvest strategy, which has been periodically updated and endorsed by the Central and Pacific Flyway Councils. From a management perspective, 3 population parameters have been identified to monitor the status and health of this population: harvest, recruitment, and population size. The number of …
Temporal Distribution Of Harvested Mid-Continent Sandhill Cranes Within The Central Flyway States During The 1997-2001 Hunting Seasons, Adrianna C. Araya, James A. Dubovsky
Temporal Distribution Of Harvested Mid-Continent Sandhill Cranes Within The Central Flyway States During The 1997-2001 Hunting Seasons, Adrianna C. Araya, James A. Dubovsky
Proceedings of the North American Crane Workshop
Since 1975, annual harvest estimates for Mid-Continent sandhill cranes (Grus canadensis) have been collected in all states for which a hunting season has been authorized by the U.S. Fish and Wildlife Service (Service). Although these data have been used to monitor the harvest of the Mid-Continent population, analyses to promote understanding of the temporal distribution of harvested sandhill cranes by individual states throughout the Central Flyway have not been conducted. For the 1997-2001 hunting seasons, we collected harvest questionnaires from 4,408 hunters in the Central Flyway who provided information about the date, location, and number of harvested sandhill …
Is Magnitude Of Fat Storage By Spring-Staging Sandhill Cranes Declining In The Central Platte River Valley , Nebraska?, David A. Brandt, Gary L. Krapu
Is Magnitude Of Fat Storage By Spring-Staging Sandhill Cranes Declining In The Central Platte River Valley , Nebraska?, David A. Brandt, Gary L. Krapu
Proceedings of the North American Crane Workshop
Proximate analyses of carcasses of sandhill cranes (Grus canadensis) collected in the Central Platte River Valley (CPRV), Nebraska, during spring 1999 indicated a marked decline in fat levels from springs 1978 and 1979. Concern that amounts of fat cranes stored by their spring departures from the CPRV may have further declined prompted this evaluation. For our assessment, we made use of morphological measurements (culmen post nares, tarsus, flattened wing chord) along with body mass on each of 810 sandhill cranes that were collected for proximate analysis or captured with rocket nets at widely distributed sites in the CPRV during 1978-1979 …
Temporal Dynamics And Flock Characteristics Of Sandhill Cranes In The Platte River Valley , Nebraska, Felipe Chavez-Ramirez
Temporal Dynamics And Flock Characteristics Of Sandhill Cranes In The Platte River Valley , Nebraska, Felipe Chavez-Ramirez
Proceedings of the North American Crane Workshop
I gathered information on crane flocks in the Platte River Valley during spring staging of 2002-2004. The objective of
this work was to evaluate hypotheses regarding flock size and formation using sandhill crane (Grus canadensis) flocks observed in
the Platte River Valley. Specifically, I wanted to: (a) evaluate the effect of period of migration, geographical location, and habitat
type on flock size, and (b) evaluate predictions regarding ecological theories of flock formation and behavior based on concentrated
resources, accessibility, social facilitation, and potential predation response. Flock size overall was influenced negatively by period
of migration (P < 0.001) and positively by geographical location (P < 0.01). Total crane abundance (55%) of flocks were located
in corn fields, but …
Extra-Pair Paternity In Sandhill Cranes, Matthew A. Hayes, Hugh B. Britten, Jeb A. Barzen
Extra-Pair Paternity In Sandhill Cranes, Matthew A. Hayes, Hugh B. Britten, Jeb A. Barzen
Proceedings of the North American Crane Workshop
Although cranes are known for “life-long” pair bonds, exceptions to this rule have been observed (i.e. divorcing pairs and individuals re-pairing following the death of a mate). With advancements in genetic techniques, another form of infidelity has been observed: extra-pair paternity (EPP; producing young with a bird while being socially paired to another mate) has been documented in many avian species. Is this true for cranes as well? Sandhill cranes (Grus canadensis) from a dense breeding population in southcentral Wisconsin were tested for EPP using 6 microsatellite DNA markers. The frequency of EPP ranged between 4.4% (2 of 45 chicks) …
Mate Fidelity In A Dense Breeding Population Of Sandhill Cranes, Matthew A. Hayes, Jeb A. Barzen, Hugh B. Britten
Mate Fidelity In A Dense Breeding Population Of Sandhill Cranes, Matthew A. Hayes, Jeb A. Barzen, Hugh B. Britten
Proceedings of the North American Crane Workshop
The objective of this study was to investigate mate switches observed in a dense breeding population of banded Sandhill Cranes (Grus canadensis). Over a 14-year period, 50 of 70 breeding pairs switched mates (71%), with 45 pairs switching permanently (64%). Mean mate retention between years was 83%, with an average pair bond lasting 5.7 years (range 1-13 years). Most permanent switches occurred following the death or disappearance of a mate, and overall permanent divorce (19%; 13 of 70 pairs) and annual divorce rates (6%) were low. Territory retention following mate switches was high. Males and females did not …
Distribution An D Dispersion Patterns Of San Dhill Crane Flocks In The Platte River Valley, Brian Lorenz, Felipe Chavez-Ramirez
Distribution An D Dispersion Patterns Of San Dhill Crane Flocks In The Platte River Valley, Brian Lorenz, Felipe Chavez-Ramirez
Proceedings of the North American Crane Workshop
We evaluated sandhill crane (Grus canadensis) flock distribution and dispersion patterns along the Platte River Valley, Nebraska, in 2002-2003. The objectives were to: (a) determine the overall distribution and relationship between roosting and foraging flock numbers by bridge segments, (b) evaluate flocking characteristics in relation to abundance of cranes in different bridge segments and total abundance, and (c) correlate dispersion patterns and habitat use to period of migration, roost locations, and habitat types. Preliminary predictions included: foraging flock dispersions would be correlated with roost locations; greater numbers and larger flock sizes will be present in bridge segments with …
Sandhill Crane Nest Habitat Selection And Factors Affecting Nest Success In Northwestern Minnesota, Stephen J. Maxson, John R. Fieberg, Michael R. Riggs
Sandhill Crane Nest Habitat Selection And Factors Affecting Nest Success In Northwestern Minnesota, Stephen J. Maxson, John R. Fieberg, Michael R. Riggs
Proceedings of the North American Crane Workshop
We studied 62 greater sandhill crane (Grus canadensis tabida) nests in northwestern Minnesota during 1989-1991 to document nest habitat use and selection, nest success, and factors associated with nest success. We recorded 15 habitat variables at each nest and at a randomly selected site in the same wetland. Nests were in basins 0.01-601 ha (Median = 2.2 ha) and at water depths 0-35.7 cm (Median = 9.7 cm). Cattail (Typha sp.) was the dominant vegetation at 58.0% of nests while 21.0% were at sites dominated by phragmites (Phragmites australis). Conditional logistic regression models indicated …