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Articles 31 - 60 of 87
Full-Text Articles in Behavior and Ethology
Survival, Movements, Social Structure, And Reproductive Behavior During Development Of A Population Of Reintroduced, Migratory Whooping Cranes, Richard P. Urbanek, Lara E. A. Fondow
Survival, Movements, Social Structure, And Reproductive Behavior During Development Of A Population Of Reintroduced, Migratory Whooping Cranes, Richard P. Urbanek, Lara E. A. Fondow
Proceedings of the North American Crane Workshop
An effort to reintroduce a migratory population of whooping cranes (Grus americana) into eastern North America began in 2001. During 2001-2004, 53 juveniles were released. All chicks were hatched at Patuxent Wildlife Research Center, Maryland, and transferred to Necedah National Wildlife Refuge (NWR), Wisconsin. Chicks were costume/isolation-reared and, with few exceptions, trained to follow ultralight aircraft, which led them to Chassahowitzka NWR, Central Gulf Coast of Florida. All individuals successfully returned to Central Wisconsin during their first spring migration except for the following: 5 individuals that were unable to navigate around Lake Michigan after taking an easterly migration …
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 …
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 …
Proceedings Of The Tenth North American Crane Workshop: Cover, Preface, Contents
Proceedings Of The Tenth North American Crane Workshop: Cover, Preface, Contents
Proceedings of the North American Crane Workshop
Every 3 years (or thereabouts), the North American Crane Working Group holds a workshop for the exchange of information regarding efforts to conserve and better understand America’s two cranes. The papers herein, with a few exceptions, were presented in Zacatecas City, Zacatecas, Mexico 7-10 February 2006 at the Tenth North American Crane Workshop. When preparing for a trip to Mexico in February, visions of sunny beaches come first to mind. However the city of Zacatecas is over 8,000 feet above sea level, so nights were often chilly and the altitudinal changes took a while for us flatlanders to adjust to. …
Current Status Of Nonmigratory Whooping Cranes In Florida, Martin J. Folk, Stephen A. Nesbitt, Jeannette M. Parker, Marilyn G. Spalding, Stephen B. Baynes, Kristen L. Candelora
Current Status Of Nonmigratory Whooping Cranes In Florida, Martin J. Folk, Stephen A. Nesbitt, Jeannette M. Parker, Marilyn G. Spalding, Stephen B. Baynes, Kristen L. Candelora
Proceedings of the North American Crane Workshop
Two hundred eighty-nine nonmigratory whooping cranes (Grus americana) were released in Central Florida from 1993-2005. As of January 2006, we had monitored 50 birds (16 pairs) but suspect 10 others had also survived, for a population estimate of 60 birds. The sex ratio for monitored birds was 1:1. From 47 nest attempts (1999-2005), only 4 chicks have fledged and survived to independence. Efforts are underway to determine why recruitment has been lower than expected. Other challenges for the project have included birds colliding with power lines, dispersing beyond their normal range (beyond Florida), forming pair bonds with Florida sandhill cranes …
Feather Molt Of Nonmigratory Whooping Cranes In Florida, Martin J. Folk, Stephen A. Nesbitt, Jeannette M. Parker, Marilyn G. Spalding, Stephen B. Baynes, Kristen L. Candelora
Feather Molt Of Nonmigratory Whooping Cranes In Florida, Martin J. Folk, Stephen A. Nesbitt, Jeannette M. Parker, Marilyn G. Spalding, Stephen B. Baynes, Kristen L. Candelora
Proceedings of the North American Crane Workshop
Molt patterns of wild whooping cranes (Grus americana) are largely unknown, and what knowledge we have has been based on scant data. We documented patterns of feather molt in nonmigratory whooping cranes in Florida during 1993-2005. All birds replaced flight feathers (remiges) in a synchronous (simultaneous) manner and spent time flightless. It took 38-46 days (mean = 44 days, n = 8) for feathers to regrow and birds to regain flight ability. When flightless due to remigial molt, cranes became more secretive and spent more time in wetlands during feather regrowth. Most (70%) whooping cranes first molted their …
Reduction Of Crop Depredations By Cranes At Daursky State Biosphere Reserve, Siberia, Oleg A. Goroshko, John E. Cornely, Stephen H. Bouffard
Reduction Of Crop Depredations By Cranes At Daursky State Biosphere Reserve, Siberia, Oleg A. Goroshko, John E. Cornely, Stephen H. Bouffard
Proceedings of the North American Crane Workshop
The Daursky State Biosphere Reserve (SBR) in southern Siberia includes the Torey Lakes, the largest lakes in the Trans-Baikal region. The Torey Lakes support tens of thousands of breeding waterbirds and about a million waterbirds during migration. Peak numbers of birds staging during fall coincide with grain harvest. Crop fields around the Torey Lakes attract 50,000 to 70,000 waterbirds, primarily cranes with lesser numbers of waterfowl, causing significant crop damage in fields near Daursky SBR. Investigations of the problem have been ongoing since 1992. Field consultation by Cornely and Bouffard in 2001 resulted in recommendations to reduce depredations. The consultation …
Serological Survey For Infectious Bursal Disease Virus Ex Posure In Captive Cranes, Barry K. Hartup, Holly S. Sellers
Serological Survey For Infectious Bursal Disease Virus Ex Posure In Captive Cranes, Barry K. Hartup, Holly S. Sellers
Proceedings of the North American Crane Workshop
Between September 2001 and March 2002, unusually high morbidity and mortality was observed during releases of endangered, captive-reared whooping cranes (Grus americana) in central Florida. An ongoing epidemiological investigation has implicated infectious bursal disease virus (IBDV; Family Birnaviridae) as the likely etiological agent (Spalding et al. 2008). The source of this virus remains unknown. A previous serological survey showed positive antibody titers to IBDV serotype 2 were present in small numbers of juvenile and adult whooping cranes at the International Crane Foundation (ICF), Baraboo, Wisconsin and the Patuxent Wildlife Research Center, Laurel, Maryland between 1995 and 2003 (Hartup et al. …
Factors Influencing Greater Sandhill Crane Nest Success At Malheur National Wildlife Refuge, Oregon, Gary L. Ivey, Bruce D. Dugger
Factors Influencing Greater Sandhill Crane Nest Success At Malheur National Wildlife Refuge, Oregon, Gary L. Ivey, Bruce D. Dugger
Proceedings of the North American Crane Workshop
We used logistic regression to model the effects of weather, habitat, and management variables on Greater Sandhill Crane (Grus canadensis tabida) nest success at Malheur National Wildlife Refuge in southeast Oregon. We monitored 506 nests over 9 breeding seasons. Mean apparent nest success was 72% ± 4% and varied from 51 to 87%. Nest success was lower one year after a field was burned and declined with nest initiation date. Nest success was higher during warmer springs, in deeper water, and in years with moderate precipitation. Haying, livestock grazing, and predator control did not influence nest success. We …
Parent-Offspring Resource Allocation In Domestic Pigs, Anna Drake, David Fraser, Daniel M. Weary
Parent-Offspring Resource Allocation In Domestic Pigs, Anna Drake, David Fraser, Daniel M. Weary
Feeding Behavior Collection
Behavioural research on domestic pigs has included parent-offspring conflict, sibling competition, and the use of signals which influence resource allocation. In this paper, we review key sow-piglet behavioural studies and discuss their relevance to resource allocation theory. Sibling competition begins in the uterus and continues after birth, as piglets compete directly for access to the sow's teats. This competition is made more severe by a unique dentition, which newborn piglets use to lacerate the faces of siblings during teat disputes. Competition often leads to the death of some littermates, especially those of low birth weight. Piglets also compete indirectly for …
Weight Changes In Wild Wolves, Canis Lupus, From Ages 2 To 24 Months, L. David Mech
Weight Changes In Wild Wolves, Canis Lupus, From Ages 2 To 24 Months, L. David Mech
USGS Northern Prairie Wildlife Research Center
Weights of 118 female and 141 male Minnesota Wolves (Canis lupus) aged 2-24 months increased almost linearly from about 8 kg for females and 10 kg for males at 3 months to 30 kg for females and 32 kg for males at 10-12 months and then tended to increase much more slowly in an overall curvilinear trend. Considerable variation was apparent for both sexes during their first year.
Demographic Effects Of Canine Parvovirus On A Free-Ranging Wolf Population Over 30 Years, L. David Mech, Sagar M. Goyal, William J. Paul, Wesley E. Newton
Demographic Effects Of Canine Parvovirus On A Free-Ranging Wolf Population Over 30 Years, L. David Mech, Sagar M. Goyal, William J. Paul, Wesley E. Newton
USGS Northern Prairie Wildlife Research Center
We followed the course of canine parvovirus (CPV) antibody prevalence in a subpopulation of wolves (Canis lupus) in northeastern Minnesota from 1973, when antibodies were first detected, through 2004. Annual early pup survival was reduced by 70%, and wolf population change was related to CPV antibody prevalence. In the greater Minnesota population of 3,000 wolves, pup survival was reduced by 40–60%. This reduction limited the Minnesota wolf population rate of increase to about 4% per year compared with increases of 16–58% in other populations. Because it is young wolves that disperse, reduced pup survival may have caused reduced …
Wolf Body Mass Cline Across Minnesota Related To Taxonomy?, L. David Mech, William J. Paul
Wolf Body Mass Cline Across Minnesota Related To Taxonomy?, L. David Mech, William J. Paul
USGS Northern Prairie Wildlife Research Center
Recent genetic studies suggest that in northern Minnesota two species of wolves (Canis lupus L., 1758 or western wolf and Canis lycaon Schreber, 1775 (= Canis rufus Audubon and Bachman, 1851) or eastern wolf) meet and hybridize. However, little morphological information is available about these two types of wolves in Minnesota. We analyzed the mass of 950 female wolves and 1006 males older than 1 year from across northern Minnesota and found that it increased from 26.30 ± 0.56 kg (mean ± SE) for females and 30.60 ± 0.72 kg for males in northeastern Minnesota to 30.01 ± 0.43 …
Factors Influencing Predation On Juvenile Ungulates And Natural Selection Implications, S. M. Barber-Meyer, L. D. Mech
Factors Influencing Predation On Juvenile Ungulates And Natural Selection Implications, S. M. Barber-Meyer, L. D. Mech
USGS Northern Prairie Wildlife Research Center
Juvenile ungulates are generally more vulnerable to predation than are adult ungulates other than senescent individuals, not only because of their relative youth, fragility, and inexperience, but also because of congenital factors. Linnell et al.’s (Wildl. Biol. 1: 209-223) extensive review of predation on juvenile ungulates concluded that research was needed to determine the predisposition of these juveniles to predation. Since then, various characteristics that potentially predispose juvenile ungulates have emerged including blood characteristics, morphometric and other condition factors, and other factors such as birth period, the mother’s experience, and spatial and habitat aspects. To the extent that any of …
Responses Ofnesting Sandhill Cranes To Research Activities And Effects On Nest Survival, Jane E. Austin, Deborah A. Buhl
Responses Ofnesting Sandhill Cranes To Research Activities And Effects On Nest Survival, Jane E. Austin, Deborah A. Buhl
Proceedings of the North American Crane Workshop
We examined the response of nesting greater sandhill cranes (Grus canadensis tabida) to research-related activities at Grays Lake, Idaho, during 1997–2000. Data were collected on >500 crane nests from 53 fields that were exposed to variable levels of research activity, from fields subjected to only periodic searches for and monitoring of crane nests (crane-only fields) to fields subjected to periodic searches for and monitoring of all waterbird nests as well as breeding bird surveys, nocturnal amphibian surveys, and other research-related activities (multi-use fields). For each nest, we calculated the visit rate to the field during the period the …
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 …
Hunting Success For Mid-Continent Sandhill Cranes In The Central Flyway: Comparing Current And Historic Results, James A. Dubovsky, Adrianna C. Araya
Hunting Success For Mid-Continent Sandhill Cranes In The Central Flyway: Comparing Current And Historic Results, James A. Dubovsky, Adrianna C. Araya
Proceedings of the North American Crane Workshop
Sport hunting for the Mid-continent population of sandhill cranes (Grus canadensis) in the United States resumed in New Mexico in 1961 after a 45-year moratorium. Interest in crane hunting continued to increase and by 1975, 8 states were participating in sandhill crane hunting. Currently, hunting seasons have been established in all Central Flyway states except Nebraska. Efforts to collect information on the annual harvest of sandhill cranes began in 1975 when hunters were required to obtain federal sandhill crane hunting permits. The permits included a hunting diary whereby hunters were asked to record information about their daily hunting …
Winter Habitat Selection By A Reintroduced Population Of Migratory Whooping Cranes: Emerging Patterns And Implications For The Future, Lara E. A. Fondow
Winter Habitat Selection By A Reintroduced Population Of Migratory Whooping Cranes: Emerging Patterns And Implications For The Future, Lara E. A. Fondow
Proceedings of the North American Crane Workshop
In an effort to model the reintroduced eastern migratory population of whooping cranes (Grus americana) after the remaining wild whooping crane population, biologists selected the salt marshes of Chassahowitzka National Wildlife Refuge (NWR), Florida as the winter release site for ultra-light led juvenile cranes due to its similarities to Aransas NWR, Texas. Releases began in the fall of 2001, and the 3 subsequent winter seasons have afforded the opportunity to observe whether habitat selection by these whooping cranes would be influenced by the pre-selection of salt marsh. Intensive monitoring efforts each winter have revealed a dominant early-winter pattern. …
Surveillance For West Nile Virus At The International Crane Foundation 2000-2004, Barry K. Hartup
Surveillance For West Nile Virus At The International Crane Foundation 2000-2004, Barry K. Hartup
Proceedings of the North American Crane Workshop
Between 2000 and 2004, serum samples collected annually from captive cranes at the International Crane Foundation (ICF) were analyzed for the presence of West Nile virus (WNV) antibodies using a plaque reduction neutralization test. Eighteen individual cranes representing 8 species were identified with positive titers (geometric mean = 188, range 40 – 1280, n = 29). Whooping cranes (Grus americana) represented the largest proportion of seropositive individuals (33%). Flock seroprevalence increased rapidly in 2003 and 2004 to a peak of 10%, representing a four-fold increase following index cases in 2000. None of the seropositive cranes, however, showed clinical signs consistent …
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 …
West Nile Encephalitis In A Captive Florida Sandhill Crane, Cristina M. Hansen, Barry K. Hartup, Olga D. Gonzalez, Douglas E. Lyman, Howard Steinberg
West Nile Encephalitis In A Captive Florida Sandhill Crane, Cristina M. Hansen, Barry K. Hartup, Olga D. Gonzalez, Douglas E. Lyman, Howard Steinberg
Proceedings of the North American Crane Workshop
A 37 year old captive male Florida sandhill crane (Grus canadensis pratensis) housed at the International Crane Foundation exhibited abnormal neurologic signs in the fall of 2006. Despite therapy and supportive care, the neurologic signs worsened and the crane was euthanized after 6 days. Antemortem and postmortem serum was positive for flavivirus antibody, and a cloacal swab was positive for West Nile virus (WNV) by reverse transcriptase polymerase chain reaction (RT-PCR). Pectoral muscle atrophy and multifocal myocardial necrosis were observed at necropsy. Histopathologic findings included inflammatory and necrotic lesions in sections of brain, spinal cord, eye, heart, blood …
Mississippi Sandhill Crane Conservation Update, 2003-2005, Scott G. Hereford, Tracy E. Grazia
Mississippi Sandhill Crane Conservation Update, 2003-2005, Scott G. Hereford, Tracy E. Grazia
Proceedings of the North American Crane Workshop
The Mississippi sandhill crane (Grus canadensis pulla) is an endangered non-migratory subspecies found on and near the Mississippi Sandhill Crane National Wildlife Refuge in southeastern Mississippi. From 2003 to 2005, conservation efforts for the recovery of this population included management activities such as protection and law enforcement, restocking, predator management, farming, prescribed burning, mechanical vegetation removal, hydrological restoration, pest plant management, and education. To maintain open savanna, 1842 hectares were burned annually, with 38% during the growing season. To restore open savanna, 506 hectares of woody vegetation were removed using mechanical methods. To bolster the population, we released 17-25 captive-reared …
Sandhill Crane Wintering Ecology In The Sacramento-San Joaquin Delta, California, Gary L. Ivey, Caroline P. Herziger
Sandhill Crane Wintering Ecology In The Sacramento-San Joaquin Delta, California, Gary L. Ivey, Caroline P. Herziger
Proceedings of the North American Crane Workshop
We studied wintering sandhill crane (Grus canadensis) ecology in 2002–2003 in the Sacramento-San Joaquin Delta of California, focusing on Staten Island, a corporate farm which was acquired by The Nature Conservancy and managed to promote sustainable agriculture that is beneficial to wildlife. Our purpose was to define habitat conservation needs for cranes, including the state-threatened greater subspecies (G. c. tabida). Research was conducted through intensive surveys by vehicle of crane foraging and roosting behavior. We estimated that about 1,500 greaters used Staten Island, which is a significant portion of the Central Valley Population of greater sandhill …
Spring Migratory Habits And Breeding Distribution Of Lesser Sandhill Cranes That Winter In West-Central New Mexico And Arizona, Gary L. Krapu, David A. Brandt
Spring Migratory Habits And Breeding Distribution Of Lesser Sandhill Cranes That Winter In West-Central New Mexico And Arizona, Gary L. Krapu, David A. Brandt
Proceedings of the North American Crane Workshop
Little information exists on the spring migratory habits and breeding distribution of lesser sandhill cranes (Grus canadensis canadensis) that winter in west-central New Mexico and southeastern Arizona. To address this question, we captured and attached a total of 6 Platform Transmitting Terminals (PTT) to adult lesser sandhill cranes at 2 sites each in west-central New Mexico and southeastern Arizona during December 2001 and monitored the birds’ movements to arrival on their arctic breeding grounds. After departing from their wintering grounds, 2 of the cranes stopped at Monte Vista NWR in south-central Colorado where they stayed for 17 and …
Habitat Characteristics Influencing Sandhill Crane Nest Site Selection, Anne E. Lacy, Su Liying
Habitat Characteristics Influencing Sandhill Crane Nest Site Selection, Anne E. Lacy, Su Liying
Proceedings of the North American Crane Workshop
The breeding population of greater Sandhill cranes (Grus canadensis tabida) in Wisconsin has greatly increased since the population was nearly extirpated in the mid-1930’s (Henika 1936). The International Crane Foundation (ICF) has been studying these birds for over 10 years in an area with one of the highest density of breeding cranes in the Midwest; we have calculated a nesting density of over 5 pairs/km2 (ICF unpublished data). Prior to this study, little was known about the habitat characteristics that may be influencing nest site selection. We conducted nest surveys by helicopter during the last week of April …
Selection Criteria For Important Sites For Wintering Sandhill Cranes In The Mexican Altiplano, Alberto Lafon Terrazas, Eduardo Carrera Gonzalez
Selection Criteria For Important Sites For Wintering Sandhill Cranes In The Mexican Altiplano, Alberto Lafon Terrazas, Eduardo Carrera Gonzalez
Proceedings of the North American Crane Workshop
Conservation of natural resources has increased worldwide, and Mexico shows the same tendency. Unfortunately, selection criteria for conservation areas and objectives do not always follow a methodology that will allow for optimum selection. In Mexico and other countries we have a series of priority sites proposed by experts in various biodiversity areas, based on knowledge of the existing biological resources of the site. This results in two situations: more attention and resources are given to certain areas, but no resources are invested in sites that could be of equal or greater importance than those currently proposed. This leads to knowledge …
Whooping Cranes And Human Disturbance: An Historical Perspective And Literature Review, Thomas E. Lewis, R. Douglas Slack
Whooping Cranes And Human Disturbance: An Historical Perspective And Literature Review, Thomas E. Lewis, R. Douglas Slack
Proceedings of the North American Crane Workshop
Whooping cranes (Grus americana) generally are not tolerant of human disturbance. Much anecdotal evidence in the literature and recent studies has shown that human disturbances cause aversive behavior in whooping cranes. Herein, we review and summarize the long history of acceptance by researchers and managers that human disturbance impacts whooping cranes and support actions to minimize human disturbance to this critically endangered species.
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 …