Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

2001

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 6241 - 6270 of 7720

Full-Text Articles in Entire DC Network

Recommendations For The Attachment Of Satellite Transmitters To Cranes, David H. Ellis, Paul W. Howey, Gary L. Krapu Jan 2001

Recommendations For The Attachment Of Satellite Transmitters To Cranes, David H. Ellis, Paul W. Howey, Gary L. Krapu

Proceedings of the North American Crane Workshop

Recent advances in miniaturization of satellite transmitters have resulted in thumb-sized packages weighing less than 30 g. These are smaller than VHF radios routinely mounted on crane leg bands. With this development and with favorable signal reception results, there is no need for, and much to recommend against, the continued use of back-pack mounts. We provide details for leg-mount attachments.


Resolutions Passed By The North American Crane Working Group Eighth North American Crane Workshop, Albuquerque, New Mexico U.S.A. Jan 2001

Resolutions Passed By The North American Crane Working Group Eighth North American Crane Workshop, Albuquerque, New Mexico U.S.A.

Proceedings of the North American Crane Workshop

Participants of the Eighth North American Crane Workshop hereby express their thanks and appreciation to the Bosque del Apache National Wildlife Refuge for hosting this workshop, to the staff of the Sheraton Old Town Hotel, to the field trip leaders, to the staff of the Bernardo Waterfowl Management Area, and to the committees and individuals who made the workshop a success. The paper sessions were excellent, and the spirit of friendship and dedication to crane conservation among the participants was revitalizing. Special thanks go to NACWG President Scott Hereford and Bosque del Apache Biologist John Taylor for their tireless effort …


Population Genetics Of Midcontinent Sandhill Cranes, Jessica L. Petersen, Richard Bischof, Allen L. Szalanski Jan 2001

Population Genetics Of Midcontinent Sandhill Cranes, Jessica L. Petersen, Richard Bischof, Allen L. Szalanski

Proceedings of the North American Crane Workshop

The Midcontinent Sandhill Crane Population is comprised of 3 subspecies, lesser (Grus canadensis canadensis), Canadian (G. c. rowani), and greater (G. c. tabida) sandhill cranes. In conjunction with the USGS Northern Prairie Wildlife Research Center, we studied the extent of genetic variation between and within each race of the Midcontinent Sandhill Crane Population. DNA was extracted from 150 feather and dried blood samples collected from 1995-99 from sandhill cranes in the Platte River Valley, central Nebraska. Parsimony and maximwn likelihood analysis of the mtDNA D-loop sequences (ca 675 bp amplified using PCR) from 29 …


Aspects Of Reproduction And Pair Bonds In Florida Sandhill Cranes, Stephen A. Nesbitt, Martin J. Folk, Stephen T. Schwikert, James A. Schmidt Jan 2001

Aspects Of Reproduction And Pair Bonds In Florida Sandhill Cranes, Stephen A. Nesbitt, Martin J. Folk, Stephen T. Schwikert, James A. Schmidt

Proceedings of the North American Crane Workshop

From 1980-98 we captured and uniquely marked more than 400 Florida sandhill cranes (Grus canadensis prafensis). Age ratios of the marked population, excluding juveniles, was 66% adult and 33% subadult, and the sex ratio was 49% male and 51% female. Average clutch size for 210 nests checked from 1983-97 was 1.78 ± 0.18 (SD) and frequency of l-egg clutches varied among years. Average post-fledging brood size from 1991 to 1997 was 1.27 ± 0.17 (SD), included a 3-chick brood. Average percent ofYOlmg from 2 study areas, 1991-97 was 11.9 ± 3.23 (SD). We observed renesting up to 3 …


An Update Of The Florida Whooping Crane Release Project Through June 2000, Stephen A. Nesbitt, Martin J. Folk, Kathleen A. Sullivan, Stephen T. Schwikert, Marilyn G. Spalding Jan 2001

An Update Of The Florida Whooping Crane Release Project Through June 2000, Stephen A. Nesbitt, Martin J. Folk, Kathleen A. Sullivan, Stephen T. Schwikert, Marilyn G. Spalding

Proceedings of the North American Crane Workshop

Whooping cranes (Grus americana) reared mostly at the USGS Patuxent Wildlife Research Center (patuxent) or the International Crane Foundation (ICF) have been released in Florida in an effort to reestablish a nonmigratory population in the southeastern United States. From 1993 through spring of 2000, we released 208 cranes. Modifications to the release procedure instituted in 1995 have greatly reduced mortality from the initial release period. First year mortality has averaged 50%. A longterm drought that began after spring 1998 may have contnbuted to increased first year mortality in recent years. Most mortality has been from predation, mostly bobcat …


A Comparison Of Behavior For Two Cohorts Of Captive-Reared Greater Sandhill Cranes Released In Northern Arizona, Daniel P. Mummert, Carol L. Chambers, David H. Ellis Jan 2001

A Comparison Of Behavior For Two Cohorts Of Captive-Reared Greater Sandhill Cranes Released In Northern Arizona, Daniel P. Mummert, Carol L. Chambers, David H. Ellis

Proceedings of the North American Crane Workshop

To determine how the behavior of greater sandhill cranes (Grus canadensis tabida) changes according to time of year, time of day, and number of days after release, we observed the activities of 2 groups of captive-reared greater sandhill cranes at Mormon Lake, northern Arizona. The behaviors we compared were alert, loafing, sleeping, foraging, preening, locomotion, and other. We found costume-reared subadult greater sandhill cranes that were established at the study site for a year spent more time foraging and being alert towards predators than parent -reared juvenile greater sandhill cranes that were recently released from captivity. We also …


Sandhill Crane Nest And Egg Characteristics At Malheur National Wildlife Refuge, Oregon, Carroll D. Littlefield Jan 2001

Sandhill Crane Nest And Egg Characteristics At Malheur National Wildlife Refuge, Oregon, Carroll D. Littlefield

Proceedings of the North American Crane Workshop

For the period 1969-89, greater sandhill crane (Grus canadensis tabida) nest and egg characteristics were assessed for pairs on the Malheur National Wildlife Refuge (Malheur), Oregon. Nests mostly were in broad-fruited burreed (Sparganium eurycarpum) and hardstem bulrush (Scirpus acutus) and were constructed primarily of the same vegetative species that surrounded nests. Averages for nest parameters were diameter 127 xIII cm, crown diameter 77 x 69 cm, bowl diameter 41 x 37 em, bowl depth 5.8 em, nest height 12.4 em, and water depth 25.8 cm. Nests were placed in vegetation with a mean height …


Effects Of An Early Spring Burn On Greater Sandhill Crane Nesting Success At Malheur National Wildlife Refuge, Oregon, Carroll D. Littlefield, John E. Cornely, Bradley D. Ehlers Jan 2001

Effects Of An Early Spring Burn On Greater Sandhill Crane Nesting Success At Malheur National Wildlife Refuge, Oregon, Carroll D. Littlefield, John E. Cornely, Bradley D. Ehlers

Proceedings of the North American Crane Workshop

A 2430 ha prescribed burn was conducted on Malheur National Wildlife Refuge, Harney County, Oregon in March 1985. About 35 days later, 11 greater sandhill crane (Grus canadensis tabida) pairs nested within the burned area; 9 of these hatched. The remaining 2 clutches were destroyed by coyotes (Canis latrans). Crane hatching success was significantly higher (P = 0.01) on the burned area (81.8%) than elsewhere (38.5%). Two factors were likely responsible for the higher success rate in the burn; nests were placed in deeper water and the smaI1 mammal prey base was temporarily reduced or eliminated …


Evaluation Of The Major Histocompatibility Complex (Mhc) In Cranes: Applications To Conservation Efforts, Susan I. Jarvi, Marcia M. Miller, Ronald M. Gotol, George F. Gee, W. Elwood Briles Jan 2001

Evaluation Of The Major Histocompatibility Complex (Mhc) In Cranes: Applications To Conservation Efforts, Susan I. Jarvi, Marcia M. Miller, Ronald M. Gotol, George F. Gee, W. Elwood Briles

Proceedings of the North American Crane Workshop

Although there have been heated discussions concerning the relative importance of using Mhc diversity as a basis for selecting breeders in conservation projects, most parties agree that the genetic variability residual in an endangered species should be maintained through genetic management, if at all possible. Substantial evidence exists (particularly in birds) documenting the influences of specific Mhc haplotypes on disease outcome and also that those individuals which are heterozygous for Mhc alleles appear to have an advantage for survival over those that are homozygous. Thus, conservation of genetic variability of the Mhc is likely important for the preservation of fitness, …


Distribution, Abundance, And Reproduction Of The Cuban Sandhill Crane (Grus Canadensis Nesiotes), Xiomara Galvez Aguilera, Vicente Berovides Alvarez, Jose Rivera Rosales Jan 2001

Distribution, Abundance, And Reproduction Of The Cuban Sandhill Crane (Grus Canadensis Nesiotes), Xiomara Galvez Aguilera, Vicente Berovides Alvarez, Jose Rivera Rosales

Proceedings of the North American Crane Workshop

We discuss the distribution, abundance, and reproduction of the Cuban sandhill crane (Grus canadensis nesiotes). This is an overview of a 5-year study conducted by the National Organization for the Protection of Flora and Fauna of the Ministry of Agriculture for the Republic of Cuba and assisted by the International Crane Foundation and Brehm Fund. The distribution of this subspecies was determined by visiting potential sites and areas where this race has previously been reported. Nine new populations were found. This brings the total to 11 on the Isle of Cuba, 1 on Cayo Romano, and 2 on …


Interactions Of Sandhill Cranes And Whooping Cranes With Foreign Objects In Florida, Martin J. Folk, Stephen A. Nesbitt, Marilyn G. Spalding Jan 2001

Interactions Of Sandhill Cranes And Whooping Cranes With Foreign Objects In Florida, Martin J. Folk, Stephen A. Nesbitt, Marilyn G. Spalding

Proceedings of the North American Crane Workshop

During studies of Florida sandhill cranes (Grus canadensis pralensis), greater sandhill cranes (G. c. tabida), and whooping cranes (G. americana) in Florida, we documented cases where these birds were in contact with human-produced objects that resulted in injury or death. We describe >40 instances in which cranes collided with powerlines or fences, became entangled in string or fishing line, or ingested foreign objects. The effect of human-produced objects on crane populations, particularly small populations, may be significant.


Bovine Tuberculosis In Brushtail Possums (Trichosurus Vulpecula): Studies On Vaccination, Experimental Infection, And Disease Transmission, L. A. L. Corner Jan 2001

Bovine Tuberculosis In Brushtail Possums (Trichosurus Vulpecula): Studies On Vaccination, Experimental Infection, And Disease Transmission, L. A. L. Corner

Michigan Bovine Tuberculosis Bibliography and Database

The objectives of the research program were to obtain a better understanding of BCG as a tuberculosis vaccine in possums, and assess its potential as a tool for controlling tuberculosis in wild possum populations. A series of vaccination and challenge experiments were conducted, as well as studies on alternative experimental infection procedures. The program included two field studies, one on the epidemiology of tuberculosis in a population of possums regenerating after localised possum eradication, and the other examined the efficacy of BCG vaccine in a wild population in which tuberculosis was endemic.

The first experiments confirmed the earlier published findings …


Movement Patterns And Behavior At Winter-Feeding And Fall Baiting Stations In A Population Of White-Tailed Deer Infected With Bovine Tuberculosis In The Northeastern Lower Peninsula Of Michigan, Mark Stephen Garner Jan 2001

Movement Patterns And Behavior At Winter-Feeding And Fall Baiting Stations In A Population Of White-Tailed Deer Infected With Bovine Tuberculosis In The Northeastern Lower Peninsula Of Michigan, Mark Stephen Garner

Michigan Bovine Tuberculosis Bibliography and Database

In 1994 bovine tuberculosis (Mycobacterium bovis) was discovered in a single free ranging white-tailed deer (Odocoileus virginianus) in northeastern Michigan (Deer Management Unit 452 @MU 452)). By the end of the 2000 hunting season, 325+ deer within the DMU 452 had been detected with M. bovis and it was generally believed that the disease had radiated from a single focus of infection. However, the presence of three TB positive deer discovered in 1999 well outside of DMU 452 suggested that M. bovis may be endemic at extremely low levels in Michigan white-tailed deer.

The primary mode …


Tuberculin Skin Testing In White-Tailed Deer (Odocoileus Virginianus), Mitchell V. Palmer, Diana L. Whipple, W. Ray Waters Jan 2001

Tuberculin Skin Testing In White-Tailed Deer (Odocoileus Virginianus), Mitchell V. Palmer, Diana L. Whipple, W. Ray Waters

Michigan Bovine Tuberculosis Bibliography and Database

The comparative cervical skin test for antemortem diagnosis of tuberculosis was done 169 times on 116 different white-tailed deer of known Mycobacterium bovis infection status. The sensitivity and specificity were 97 and 81%, respectively. The magnitude of change in skin thickness at test sites was not significantly influenced by dosage of inoculum, dissemination of the disease process, or repeated skin testing. However, the magnitude of change in skin thickness was significantly greater in deer infected for less than 109 days than in deer infected for more than 109 days. As used in the present study, the comparative cervical skin test …


Now & Then (Volume 18, Issue 01, 2001), Center Of Excellence For Appalachian Studies And Services, East Tennessee State University Jan 2001

Now & Then (Volume 18, Issue 01, 2001), Center Of Excellence For Appalachian Studies And Services, East Tennessee State University

Now & Then: The Appalachian Magazine

Now & Then: The Appalachian Magazine, Volume 18, Issue 01, published in 2001. The theme of this issue is Appalachian Rivers, Lakes, & Streams. This issue examines the central role of waterways in Appalachian environmental, economic, and cultural life, addressing both their vulnerability and vitality. Through articles on regional water shortages, aquaculture-based science education, and industrial heritage initiatives such as Southwest Pennsylvania's Rivers of Steel, it highlights tensions between development, resource management, and sustainability. Essays, fiction, poetry, and reviews further reflect on memory, labor, recreation, and loss connected to rivers and streams, presenting water as both a life-sustaining resource …


Biotic And Abiotic Effects On Endoparasites Infecting Dipodomys And Perognathus Species, Kimberly H. Decker, Donald W. Duszynski, Michael J. Patrick Jan 2001

Biotic And Abiotic Effects On Endoparasites Infecting Dipodomys And Perognathus Species, Kimberly H. Decker, Donald W. Duszynski, Michael J. Patrick

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Between 1989 and 1998, 3,504 rodents of the genera Dipodomys and Perognathus were collected from 4 permanent collecting sites on the University of New Mexico’s Long Term Ecological Research station, located on the Sevilleta National Wildlife Refuge (SNWR), Socorro County, New Mexico. All animals were killed and examined for endoparasites (acanthocephalans, cestodes, coccidia, and nematodes). The present report focuses on 3 endoparasite groups, cestodes, coccidia, and nematodes. Specific analyses address how prevalence changes were related to abiotic factors such as habitat, season, or precipitation, and how prevalence of each parasite species in each host species differed in relation to host …


Inventory Of Parks Division Lands For Threatened And Endangered Species Habitats And Exemplary Natural Communities, Steven B. Rolfsmeier Jan 2001

Inventory Of Parks Division Lands For Threatened And Endangered Species Habitats And Exemplary Natural Communities, Steven B. Rolfsmeier

Nebraska Game and Parks Commission: White Papers, Conference Presentations, and Manuscripts

The Nebraska Natural Heritage Program is responsible for environmental review of state projects, including those on Parks division properties, to determine if they may impact state-listed threatened and endangered species. In addition, the Program maintains a statewide database on natural communities and rare and imperiled species. This information is used to inform conservation decision-making, including land management decisions, with a goal of conserving Nebraska’s flora and fauna, our natural legacy. The two main objectives of this inventory project were first to improve the Nebraska Game and Parks Commission’s knowledge of threatened and endangered species and their potential habitat on Parks …


Aquatic Plants Of Nebraska, Michael P. Gutzmer, Robert B. Kaul Jan 2001

Aquatic Plants Of Nebraska, Michael P. Gutzmer, Robert B. Kaul

University of Nebraska State Museum: Programs Information

More than 100 species of aquatic plants grow in Nebraska. Some are entirely submersed for their whole lives, others produce floating leaves and flowers, and still others stand upright, with only their lower stems in water. Examples of these are shown here in this publication.

Vigorous and diverse colonies of aquatic plants are usually a sign of healthy and stable aquatic environments. In fact, the plants themselves stabilize the shorelines, underwater soils, and water chemistry. Waters rich with aquatic plants are rich with aquatic animals and waterfowl, which find cover, breeding habitat, and abundant food. Non-alkaline waters have more aquatic …


Something To Sneeze At: Nebraska's Airborne Pollen, Margaret R. Bolick Jan 2001

Something To Sneeze At: Nebraska's Airborne Pollen, Margaret R. Bolick

University of Nebraska State Museum: Programs Information

For those of us whose noses know (and don't like) pollen, late October is a time for celebration in Nebraska because it is the end of the hay fever season. When one's nose is a sensitive bio-detector of the presence of pollen, one's brain usually appreciates putting a name to whatever is causing the itchy eyes and runny nose. The job of putting names on the types of pollen in the air has been done by a dedicated team of pollen counters in the Division of Botany, University of Nebraska State Museum. This group, led by Curator Peg Bolick, has …


Out Of Africa: Origins Of The Taenia Tapeworms In Humans, Eric P. Hoberg, Nancy L. Alkire, Alan De Queiroz, Arlene Jones Jan 2001

Out Of Africa: Origins Of The Taenia Tapeworms In Humans, Eric P. Hoberg, Nancy L. Alkire, Alan De Queiroz, Arlene Jones

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Phylogenetic and divergence date analyses indicate that the occurrence of Taenia tapeworms in humans pre-dates the development of agriculture, animal husbandry and domestication of cattle (Bos spp.) or swine (Sus scrofa) Taeniid tapeworms in Africa twice independently colonized hominids and the genus Homo prior to the origin of modern humans. Dietary and behavioural shifts, from herbivory to scavenging and carnivory, as early Homo entered the carnivore guild in the Pliocene/Pleistocene, were drivers for host switching by tapeworms to hominids from carnivores including hyaenids and felids. Parasitological data provide a unique means of elucidating the historical ecology, foraging behavior …


Cetacean Sightings Around The Republic Of The Maldives, April 1998, Lisa T. Ballance, R. Charles Anderson, Robert L. Pitman, Kathleen Stafford, Abdullah Shaan, Zaha Waheed, Robert L. Brownell Jr. Jan 2001

Cetacean Sightings Around The Republic Of The Maldives, April 1998, Lisa T. Ballance, R. Charles Anderson, Robert L. Pitman, Kathleen Stafford, Abdullah Shaan, Zaha Waheed, Robert L. Brownell Jr.

United States Department of Commerce: Staff Publications

In April 1998, as part of a project to collect biopsy samples of putative pygmy blue whales (Balaenoptera musculus brevicauda) in the waters around the Republic of the Maldives, Indian Ocean, incidental sightings of cetaceans encountered were recorded. Using modified line-transect methods and handheld binoculars, a total of 267 sightings of 16 species of whales and dolphins were recorded during 20 at-sea days in the northeastern part of the atoll. Significant results include the following: (1) cetaceans were abundant and species diversity was high, including nearly every pantropical species of pelagic cetacean; (2) the spinner dolphin (Stenella …


Modeling Reptile And Amphibian Range Distributions From Species Occurrences And Landscape Variables, Geoffrey M. Henebry, Brian C. Putz, James W. Merchant Jan 2001

Modeling Reptile And Amphibian Range Distributions From Species Occurrences And Landscape Variables, Geoffrey M. Henebry, Brian C. Putz, James W. Merchant

United States Geological Survey: Publications

An international symposium in October 1999 demonstrated the state of the art in modeling species occurrences (Scott et al. 2001). One clear message from the symposium was the broad diversity of approaches that constitute the state of the art. No single method excels, largely because of the very particular and local nature of the problem. Organisms both influence and respond to their local environment; thus, the same species may key in on different resources in different landscapes. Furthermore, modeling methods vary widely in their "transparency," which can inhibit transportability or robustness.
In order to provide an analytical modeling framework that …


Review Of The Historical And Present Status Of The Lesser Prairie-Chicken (Tympanuchus Pallidicinctus) In Texas, Robert M. Sullivan, John P. Hughes, James E. Lionberger Jan 2001

Review Of The Historical And Present Status Of The Lesser Prairie-Chicken (Tympanuchus Pallidicinctus) In Texas, Robert M. Sullivan, John P. Hughes, James E. Lionberger

United States Fish and Wildlife Service: Publications

Historically, the lesser prairie-chicken (Tympanuchus pallidicinctus) occurred in sandy rangeland throughout the northeastern and southwestern (Permian Basin) regions of the Texas Panhandle. Analyses of the historical distribution showed a large reduction in the range of the species in Texas between 1963 and 1980 (78% or 1,070,426 ha), particularly in the southwestern and east-central panhandle, whereas populations in the northeastern Panhandle remained relatively stable. In the northeastern Panhandle, average number of males per lek increased since 1942. In the southwestern Panhandle, average numbers of males per lek decreased dramatically from 1969 to 1981 and from 1985 to 2000, but …


Creston National Fish Hatchery, Montana Restoring America’S Fisheries Jan 2001

Creston National Fish Hatchery, Montana Restoring America’S Fisheries

United States Fish and Wildlife Service: Publications

The National Fish Hatchery System (NFHS) is comprised of 70 Fish Hatcheries, 7 Fish Technology Centers, and 9 Fish Health Centers nation wide.  The NFHS operated by the U.S. Fish and Wildlife Service has a unique responsibility in helping restore native aquatic populations, mitigate for fisheries lost as a result of federal water projects, provide fish to benefit Tribes and the National Wildlife Refuges, and to recover species listed under the Endangered Species Act.  The NFHS works closely with other programs in the Service and with the States, Tribes, and the private sector to complement habitat restoration and other resource …


D.C. Booth Historic National Fish Hatchery, South Dakota Restoring America’S Fisheries Jan 2001

D.C. Booth Historic National Fish Hatchery, South Dakota Restoring America’S Fisheries

United States Fish and Wildlife Service: Publications

Established in 1896, DC Booth Historic NFH, formerly Spearfish NFH, is one of the oldest operating hatcheries in the country dedicated to fish culture and resource management.  The hatchery was constructed to propagate, stock, and establish trout populations in the Black Hills of South Dakota and Wyoming.  After a very successful fish production history, the hatchery ceased operations in the mid-80's and reopened with a new mission and partnership to help preserve the U.S. Fish and Wildlife Service's historic and cultural heritage.

Today, DC Booth Historic NFH serves as a living fishery museum to the public and many organizations.  Still …


Hotchkiss National Fish Hatchery, Colorado Restoring America’S Fisheries Jan 2001

Hotchkiss National Fish Hatchery, Colorado Restoring America’S Fisheries

United States Fish and Wildlife Service: Publications

Hotchkiss NFH was established in 1967 as part of the Colorado River Storage Project Act.  Located on 59 acres of forest surroundings on the North Fork of the Gunnison River, the hatchery's cold, clean water supply comes from the adjacent Tommy Dowell Spring.

Tommy Dowell Spring was created in the 1930's by an earthquake near Salt Lake City, whose tremors also affected the Hotchkiss area.  The spring has a constant water temperature of 56 °F and flows from 2,200 to 5,000 gallons per minute, providing the ideal conditions for trout production.


Currently, the hatchery is rearing rainbow trout for stocking …


Valentine National Wildlife Refuge 2001 Jan 2001

Valentine National Wildlife Refuge 2001

United States Fish and Wildlife Service: Publications

INTRODUCTION

Valentine National Wildlife Refuge (NWR) was established on August 4, 1935 under the Migratory Bird Conservation Act by Executive Order 7142. The purpose of the refuge as stated in the executive order is “as a refuge and breeding ground for migratory birds and other wildlife.” Acquisition funding came from Duck Stamp sales and the Emergency Conservation Fund Of 1933.

The 71,272-acre Valentine NWR is located in the Sandhills of north-central Nebraska. The Sandhills contain the largest remaining stands of mid and tall grass native prairie left in North America. The refuge is a unique and ecologically important component of …


Mitochondrial Phylogeography, Subspecific Taxonomy, And Conservation Genetics Of Sandhill Cranes (Grus Canadensis; Aves: Gruidae), Judith M. Rhymer, Matthew G. Fain, Jane E. Austin, Douglas H. Johnson, Carey Krajewski Jan 2001

Mitochondrial Phylogeography, Subspecific Taxonomy, And Conservation Genetics Of Sandhill Cranes (Grus Canadensis; Aves: Gruidae), Judith M. Rhymer, Matthew G. Fain, Jane E. Austin, Douglas H. Johnson, Carey Krajewski

United States Geological Survey, Northern Prairie Wildlife Research Center: Publications

Six subspecies of sandhill cranes (Grus canadensis) have been denoted based on perceived morphological and/or breeding locality differences among them. Three subspecies are migratory, breeding from the high arctic in North America and Siberia (lesser sandhill, G. c. canadensis), south through central Canada (Canadian sandhill, G. c. rowani) and into the northern United States (greater sandhill, G. c. tabida). A review of sandhill crane taxonomy indicates that the size variation, on the basis of which these subspecies were named, may be clinal and not diagnostic. The other three subspecies, all listed as endangered or threatened, …


Area Requirements Of Grassland Birds: A Regional Perspective, Douglas Johnson, Lawrence Igl Jan 2001

Area Requirements Of Grassland Birds: A Regional Perspective, Douglas Johnson, Lawrence Igl

United States Geological Survey, Northern Prairie Wildlife Research Center: Publications

Area requirements of grassland birds ha ve not been studied except in tallgrass prairie. We studied the relation between both species-occurrence and density and patch size by conducting 699 fixed-radius point counts of 15 bird species on 303 restored grassland areas in nine counties in four northern Great Plains states. Northern Harrier (Circus cyaneus), Sedge Wren (Cistothorus platensis, Clay-colored Sparrow (Spizella pallida), Grasshopper Sparrow (Ammodramus savannarum), Baird’s Sparrow ( Ammodramus bairdii)), Le Conte’s Sparrow (Ammodramus leconteii), and Bobolink (Dolichonyx oryzivorus) were shown to favor larger grassland patches …


Inhibition Of Erythrocyte Δ- Aminolevulinic Acid Dehydratase (Alad) Activity In Fish From Waters Affects By Lead Smelters, Christopher J. Schmitt, Colleen A. Caldwell, Bill Olsen, Dave Serdar Jan 2001

Inhibition Of Erythrocyte Δ- Aminolevulinic Acid Dehydratase (Alad) Activity In Fish From Waters Affects By Lead Smelters, Christopher J. Schmitt, Colleen A. Caldwell, Bill Olsen, Dave Serdar

United States Geological Survey: Staff Publications

We assessed the effects on fish of lead (Pb) released to streams by smelters located in Trail, BC (Canada), E. Helena, MT, Herculaneum, MO, and Glover, MO. Fish were collected by electrofishing from sites located downstream of smelters and from reference sites. Blood from each fish was analyzed for δ-aminolevulinic acid dehydratase (ALAD) activity and hemoglobin (Hb), and samples of blood, liver, or carcass were analyzed for Pb, zinc (Zn), or both. Fish collected downstream of all four smelters sites had elevated Pb concentrations, decreased ALAD activity, or both relative to their respective reference sites. At E. Helena, fish from …