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Articles 31 - 60 of 93
Full-Text Articles in Entire DC Network
Brown-Headed Cowbirds In Grasslands: Their Habitats, Hosts, And Response To Management, Jill Shaffer, Christopher Goldade, Meghan Dinkins, Douglas Johnson, Lawrence Igl, Betty Euliss
Brown-Headed Cowbirds In Grasslands: Their Habitats, Hosts, And Response To Management, Jill Shaffer, Christopher Goldade, Meghan Dinkins, Douglas Johnson, Lawrence Igl, Betty Euliss
USGS Northern Prairie Wildlife Research Center
The brown-headed cowbird (Molothrus ater) is an obligate brood parasite whose numbers have increased in recent decades to the potential detriment of the species that they parasitize. Thus, most management efforts focus on discouraging brown-headed cowbird parasitism or controlling brown-headed cowbird populations. Keys to discouraging cowbird parasitism or controlling populations of brown-headed cowbirds in the Great Plains are maintaining large expanses of grassland, eliminating foraging areas (e.g., feedlots) and perch sites, and reducing the extent of overgrazed pastures.
Beyond Ecology: Bugs Reveal The Deep Roots Of Grassland Ecoregions, K. G.A. Hamilton
Beyond Ecology: Bugs Reveal The Deep Roots Of Grassland Ecoregions, K. G.A. Hamilton
Proceedings of the North American Prairie Conferences
Northern grassland faunas that were most affected by glaciation, induced climate shifts include more than 225 endemic phytophagous bugs (leafhoppers and related insects, the Homoptera,Auchenorrhyncha) on Canadian plains, and another 275 in Pacific Northwest intermontane grasslands. These exceptionally rich endemic faunas include many insect,plant associations common to related species of bugs, suggesting adaptation to certain environmental factors that persisted over millions of years despite radical environmental changes induced by glacial advances and retreats. Smaller, but significant, endemic faunas of Homoptera,Auchenorrhyncha in other glaciated areas also reveal patterns of ancient ecological areas. Groups of these grassland,endemic bugs are common to grassland …
Influence Of Matrix Elements On Prairie-Inhabiting Curculionidae, Tenebrionidae, And Scarabaeidae In The Palouse, Timothy D. Hatten, Sandford D. Eigenbrode, Nilsa A. Bosque-Pérez, Sarah Gebbie, Frank Merickel, Chris Looney
Influence Of Matrix Elements On Prairie-Inhabiting Curculionidae, Tenebrionidae, And Scarabaeidae In The Palouse, Timothy D. Hatten, Sandford D. Eigenbrode, Nilsa A. Bosque-Pérez, Sarah Gebbie, Frank Merickel, Chris Looney
Proceedings of the North American Prairie Conferences
It is well established that the invertebrate community in cropland under conservation-tillage (consT) is often enriched relative to the community under conventional-tillage (CT) systems. The question posed in this research is whether consT contributes to the maintenance of regional biodiversity and to the conservation of prairie-inhabiting species in agriculturally dominated landscapes that contain prairie remnants. During 2002, we sampled the grounddwelling beetle fauna of remnant Palouse prairie and surrounding cropland (under CT and consT) in the Palouse region of northwestern Idaho and southeastern Washington. Biological diversity of the representative taxa-Curculionidae (weevils), Tenebrionidae (darkling beetles) and Scarabaeidae (scarab beetles)-is significantly higher …
Adapting A Floral Biogeography Model To Prairie-Dependent Lepidoptera, Eric H. Metzler, John A. Shuey, Leslie A. Ferge, Richard A, Henderson, Paul Z. Goldstein
Adapting A Floral Biogeography Model To Prairie-Dependent Lepidoptera, Eric H. Metzler, John A. Shuey, Leslie A. Ferge, Richard A, Henderson, Paul Z. Goldstein
Proceedings of the North American Prairie Conferences
Analysis of data collected for a study of prairie dependent Lepidoptera in the northern tallgrass prairies showed four distributional patterns. A logical distributional pattern links species' distribution, i.e. Catocala abbreviatella, to larval host plants. Absence of larval host plant data, which is the case for most species of moths, requires inference based on habitat data of known specimens, i.e. Tarachidia binocula, or in the case of infrequently encountered species, i.e. Crambus murellus, capture data for a limited number of specimens. A fourth distributional pattern, i. e. Atrytone arogos, can be explained by hypotheses which explain the …
Effects Of Management Practices On Grassland Birds: American Bittern, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Amy L. Zimmerman, Betty R. Euliss
Effects Of Management Practices On Grassland Birds: American Bittern, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Amy L. Zimmerman, Betty R. Euliss
USGS Northern Prairie Wildlife Research Center
Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 4,000 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds frequently are observed outside the breeding range indicated, the maps are intended to show areas where managers might concentrate their attention. It may be ineffectual to manage habitat at a site for a species that rarely occurs in an area. The species account begins with a brief capsule statement, which …
Less Waste Corn, More Land In Soybeans, And The Switch To Genetically Modified Crops: Trends With Important Implications For Wildlife Management, Gary L. Krapu, David A. Brandt, Robert R. Cox Jr.
Less Waste Corn, More Land In Soybeans, And The Switch To Genetically Modified Crops: Trends With Important Implications For Wildlife Management, Gary L. Krapu, David A. Brandt, Robert R. Cox Jr.
USGS Northern Prairie Wildlife Research Center
American agriculture has provided abundant high-energy foods for migratory and resident wildlife populations since the onset of modern wildlife management. Responding to anecdotal evidence that corn residues are declining in cropland, we remeasured waste corn postharvest in the Central Platte River Valley (CPRV) of Nebraska during 1997 and 1998 to compare with 1978. Post-harvest waste corn averaged 2.6% and 1.8% of yield in 1997 and 1998, respectively. After accounting for a 20% increase in yield, waste corn in 1997 and 1998 was reduced 24% and 47% from 1978. We also evaluated use of soybeans by spring-staging sandhill cranes ( Grus …
Effects Of Distance From Cattle Water Developments On Grassland Birds, Andrea L. Fontaine, Patricia L. Kennedy, Douglas H. Johnson
Effects Of Distance From Cattle Water Developments On Grassland Birds, Andrea L. Fontaine, Patricia L. Kennedy, Douglas H. Johnson
USGS Northern Prairie Wildlife Research Center
Many North American grassland bird populations appear to be declining, which may be due to changes in grazing regimes on their breeding areas. Establishment of water developments and confining cattle (Bos taurus L.) to small pastures often minimizes spatial heterogeneity of cattle forage consumption, which may lead to uniformity in vegetative structure. This increased uniformity may provide suitable habitat for some bird species but not others. We assessed how cattle use, vegetative structure, and bird population densities varied with increasing distance from water developments (0-800 m) on the Little Missouri National Grassland (LMNG) in North Dakota. Lark buntings ( …
Response Of Grassland Birds To Fire On A Wisconsin Sand Prairie Over An 18-Year Period, Greg Geller, David Sample, Rich Henderson
Response Of Grassland Birds To Fire On A Wisconsin Sand Prairie Over An 18-Year Period, Greg Geller, David Sample, Rich Henderson
Proceedings of the North American Prairie Conferences
The relative abundance of grassland birds was estimated on an 81-ha (200-acre) dry to dry-mesic sand prairie in south, west Wisconsin over an 18-year period (1987-2004). Birds were surveyed three times during the breeding season on seven, 2-ha (5-acre) strip transects in six different burn units. We compared results to time since fire and other habitat features. The average rotation of prescribed fires in the burn units ranged from three to six years. Seven species were selected for detailed analysis. These were grasshopper sparrows (Ammodramus savannarum),-18-year average of 1.33 birds per ha, field sparrows (Spizella pusilla) …
Potential Habitat Factors Influencing Carrion Beetles Communities Of Palouse Prairie Remnants, Chris Looney, Benjamin T. Caldwell, Timothy D. Hatten, Christopher Lorion, Sanford D. Eigenbrode
Potential Habitat Factors Influencing Carrion Beetles Communities Of Palouse Prairie Remnants, Chris Looney, Benjamin T. Caldwell, Timothy D. Hatten, Christopher Lorion, Sanford D. Eigenbrode
Proceedings of the North American Prairie Conferences
The bunchgrass prairies of the Palouse region in eastern Washington state and adjacent Idaho were almost completely converted to agriculture in the past century. Today, prairie habitat exists only on small remnants scattered across the landscape. The invertebrate fauna of these habitat remnants is poorly known, both in terms of species diversity and community composition. Pitfall traps baited with carrion were used to sample carrion beetles (Coleoptera: Silphidae) during June and July of 2003. Prairie remnants were selected based on size to test whether habitat area influenced the diversity of this important insect community. Three size classes were identified; greater …
Habitat Use And Migration Patterns Of Sandhill Cranes Along The Platte River, 1998 – 2001, Craig Davis
Habitat Use And Migration Patterns Of Sandhill Cranes Along The Platte River, 1998 – 2001, Craig Davis
Great Plains Research: A Journal of Natural and Social Sciences
During spring migration, sandhill cranes (Crus Canadensis) rely on the central Platte River valley in Nebraska as a staging area to replenish depleted energy and nutrient reserves. From mid-February to mid-April 1998-2001, we conducted ground and aerial surveys of sandhill cranes in the central Platte River valley. Peak numbers of sandhill cranes (121,000-285,000 cranes) detected during ground surveys occurred in mid-March (1998, 2001) or early March (1999, 2000). From 42% to 55% of the cranes occurred in cornfields, 26%-38% in lowland grassland, 7%-13% in alfalfa, and 2%-12% in other habitats (soybean, winter wheat, shrub-grassland, upland grassland). In general, …
Waving "A Bough Of Challenge" Forestry On The Kansas Grasslands, 1868-1915, Brian Allen Drake
Waving "A Bough Of Challenge" Forestry On The Kansas Grasslands, 1868-1915, Brian Allen Drake
Great Plains Quarterly
Kansas is legendary for geographical monotony, for a landscape allegedly so absent of trees and relief that the state has become the butt of national jokes and a cultural synonym for flat. Kansas is not really flat; tilted might be a better description, for the state rises some 3,300 feet in elevation along the 400-mile stretch between Kansas City and Kanorado. Kansas is lacking in substantial tree cover, though, especially in its western third. US Forest Service researchers noted in 1999 that forests covered slightly less than 3 percent of the state, concentrated mostly in the northeast and southeast corners. …
Effects Of Management Practices On Grassland Birds: Northern Harrier, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Melvin P. Nenneman, Betty R. Euliss
Effects Of Management Practices On Grassland Birds: Northern Harrier, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Melvin P. Nenneman, Betty R. Euliss
USGS Northern Prairie Wildlife Research Center
Northern Harrier (Circus cyaneus):
Breeding range
Suitable habitat
Prey habitat
Area requirements
Brown-headed Cowbird brood parasitism
Breeding-season phenology and site fidelity
Species’ response to management
Management Recommendations
Habitat Characteristics
Effects Of Management Practices On Grassland Birds: Sedge Wren, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Barry D. Parkin, Betty R. Euliss
Effects Of Management Practices On Grassland Birds: Sedge Wren, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Barry D. Parkin, Betty R. Euliss
USGS Northern Prairie Wildlife Research Center
Sedge Wren (Cistothorus platensis):
Breeding range
Suitable habitat
Area requirements
Brown-headed Cowbird brood parasitism
Breeding-season phenology and site fidelity
Species’ response to management
Management Recommendations
Habitat Characteristics
Assemblages Of Breeding Birds As Indicators Of Grassland Condition, Sharon Freshman Browder, Douglas H. Johnson, I. J. Ball
Assemblages Of Breeding Birds As Indicators Of Grassland Condition, Sharon Freshman Browder, Douglas H. Johnson, I. J. Ball
USGS Northern Prairie Wildlife Research Center
We developed a measure of biological integrity for grasslands (GI) based on the most influential habitat types in the Prairie Pothole Region of North Dakota. GI is based on proportions of habitat types and the relationships of these habitat types to breeding birds. Habitat types were identified by digital aerial photography, verified on the ground, and quantified using GIS. We then developed an index to GI based on the presence or abundance of breeding bird species. Species abundance data were obtained from 3 min roadside point counts at 889 points in 44, 4050 ha study plots over a 2-year period. …
Effects Of Management Practices On Grassland Birds: Dickcissel, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Amy L. Zimmerman, Betty R. Euliss
Effects Of Management Practices On Grassland Birds: Dickcissel, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Amy L. Zimmerman, Betty R. Euliss
USGS Northern Prairie Wildlife Research Center
Dickcissel (Spiza americana):
Breeding range
Suitable habitat
Area requirements
Brown-headed Cowbird brood parasitism
Breeding-season phenology and site fidelity
Species’ response to management
Management Recommendations
Habitat Characteristics
Effects Of Management Practices On Grassland Birds: Willet, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Barry D. Parkin, Betty R. Euliss
Effects Of Management Practices On Grassland Birds: Willet, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Barry D. Parkin, Betty R. Euliss
USGS Northern Prairie Wildlife Research Center
Willet (Catoptrophorus semipalmatus inornatus):
Breeding range
Suitable habitat
Area requirements
Brown-headed Cowbird brood parasitism
Breeding-season phenology and site fidelity
Species’ response to management
Management Recommendations
Habitat Characteristics
Effects Of Management Practices On Grassland Birds: Loggerhead Shrike, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Melvin P. Nenneman, Amy L. Zimmerman, Betty R. Euliss
Effects Of Management Practices On Grassland Birds: Loggerhead Shrike, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Melvin P. Nenneman, Amy L. Zimmerman, Betty R. Euliss
USGS Northern Prairie Wildlife Research Center
Loggerhead Shrike (Lanius ludovicianus):
Breeding range
Suitable habitat
Area requirements
Prey habitat
Brown-headed Cowbird brood parasitism
Breeding-season phenology and site fidelity
Species’ response to management
Management Recommendations
Habitat Characteristics
Effects Of Management Practices On Grassland Birds: Grasshopper Sparrow, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Melvin P. Nenneman, Betty R. Euliss
Effects Of Management Practices On Grassland Birds: Grasshopper Sparrow, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Melvin P. Nenneman, Betty R. Euliss
USGS Northern Prairie Wildlife Research Center
Grasshopper Sparrow (Ammodramus savannarum):
Breeding range
Suitable habitat
Area requirements
Brown-headed Cowbird brood parasitism
Breeding-season phenology and site fidelity
Species’ response to management
Management Recommendations
Habitat Characteristics
Effects Of Management Practices On Grassland Birds: Field Sparrow, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Barry D. Parkin, Betty R. Euliss
Effects Of Management Practices On Grassland Birds: Field Sparrow, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Barry D. Parkin, Betty R. Euliss
USGS Northern Prairie Wildlife Research Center
Field Sparrow (Spizella pusilla):
Breeding range
Suitable habitat
Area requirements
Brown-headed Cowbird brood parasitism
Breeding-season phenology and site fidelity
Species’ response to management
Management Recommendations
Habitat Characteristics
Abundance And Habitat Associations Of Birds Wintering In The Platte River Valley, Nebraska, Craig Davis
Abundance And Habitat Associations Of Birds Wintering In The Platte River Valley, Nebraska, Craig Davis
Great Plains Research: A Journal of Natural and Social Sciences
The abundance and habitat associations of overwintering birds in Platte River Valley of central Nebraska may influence their long-term survival. I observed a total of 51 species over a three-year period in shrub-grassland, forest, grassland, and cropland habitats during the winter. Grassland habitats had the lowest abundance of wintering birds, while abundances in shrub-grassland, forest, and cropland habitats were higher and similar. Species richness was highest in forests ( x= 2.97 species) and lowest in grasslands (x = 0.73 species) and croplands (x = 0.57 species). Overall, horned larks (Eremophila alpestris), American tree sparrows (Spizella arborea), …
Habitat Fragmentation Effects On Birds In Grasslands And Wetlands: A Critique Of Our Knowledge, Douglas Johnson
Habitat Fragmentation Effects On Birds In Grasslands And Wetlands: A Critique Of Our Knowledge, Douglas Johnson
Great Plains Research: A Journal of Natural and Social Sciences
Habitat fragmentation exacerbates the problem of habitat loss for grassland and wetland birds. Remaining patches of grasslands and wetlands may be too small, too isolated, and too influenced by edge effects to maintain viable populations of some breeding birds. Knowledge of the effects of fragmentation on bird populations is critically important for decisions about reserve design, grassland and wetland management, and implementation of cropland set-aside programs that benefit wildlife. In my review of research that has been conducted on habitat fragmentation, I found at least five common problems in the methodology used. The results of many studies are compromised by …
Review Of Standard Soil Methods For Long-Term Ecological Research Edited By G. Philip Robertson, David E. Coleman, Caroline S. Bledsoe, And Phillip Sollins, Mary Ann Vinton
Great Plains Research: A Journal of Natural and Social Sciences
Standard Soil Methods for Long-Term Ecological Research is the second in a series of books dedicated to summarizing the research results and methods of ecological studies being conducted at sites around North America and Antarctica under the sponsorship of the National Science Foundation's Long-Term Ecological Research (LTER) program. The twenty-one sites range from arctic tundra to hot desert and from natural tropical rainforest to urban and suburban areas.
What The Past Can Provide: Contribution Of Prehistoric Bison Studies To Modern Bison Management, Kenneth Cannon
What The Past Can Provide: Contribution Of Prehistoric Bison Studies To Modern Bison Management, Kenneth Cannon
Great Plains Research: A Journal of Natural and Social Sciences
For over 100 years, bison in the Greater Yellowstone Area have been managed intensely. Even during the years of "natural regulation," bison herds have been heavily managed by culling. One of the fundamental goals of the plan for the Greater Yellowstone Area is to maintain the ecosystem's integrity using sound science. In order to reach this goal, it must be recognized that it is a dynamic system, continually undergoing change. However, our knowledge of such changes is extremely limited. In the case of bison, our knowledge is based on nonsystematically collected historic records and modern studies of small, isolated populations. …
Carbon And Nitrogen Isotopes In Archeological Bison Remains As Indicators Of Paleoenvironmental Change In Southern Alberta, Jeremy J. Leyden, Gerald Oetelaar
Carbon And Nitrogen Isotopes In Archeological Bison Remains As Indicators Of Paleoenvironmental Change In Southern Alberta, Jeremy J. Leyden, Gerald Oetelaar
Great Plains Research: A Journal of Natural and Social Sciences
Between 1995 and 1997, archeological excavations in northwest Calgary, Alberta, uncovered cultural materials from several occupations dating back 8,500 years. Samples of bison bone recovered at the sites were chemically prepared and analyzed for isotopic ratios. Using the resultant carbon and nitrogen isotope ratios, we reconstructed the diet of bison from four different cultural occupations spanning the last 8,500 years. Based on current and established models of bison subsistence behavior, this dietary information was used to infer large-scale environmental changes during this time interval in our study area. The inferred changes in vegetation and climate were compared with paleoenvironmental reconstructions …
Effects Of Management Practices On Grassland Birds: Bobolink, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Amy L. Zimmerman, Betty R. Euliss
Effects Of Management Practices On Grassland Birds: Bobolink, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Amy L. Zimmerman, Betty R. Euliss
USGS Northern Prairie Wildlife Research Center
Bobolink (Dolichonyx oryzivorus):
Breeding range
Suitable habitat
Area requirements
Brown-headed Cowbird brood parasitism
Breeding-season phenology and site fidelity
Species’ response to management
Management Recommendations
Characteristics
Effects Of Management Practices On Grassland Birds: Marbled Godwit, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Melvin P. Nenneman, Betty R. Euliss
Effects Of Management Practices On Grassland Birds: Marbled Godwit, Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Melvin P. Nenneman, Betty R. Euliss
USGS Northern Prairie Wildlife Research Center
Marbled Godwit (Limosa fedoa):
Breeding range
Suitable habitat
Area requirements
Brown-headed Cowbird brood parasitism
Breeding-season phenology and site fidelity
Species’ response to management
Management Recommendations
Habitat Characteristics
Suggestions For Presenting The Results Of Data Analysis, David R. Anderson, William A. Link, Douglas H. Johnson, Kenneth P. Burnham
Suggestions For Presenting The Results Of Data Analysis, David R. Anderson, William A. Link, Douglas H. Johnson, Kenneth P. Burnham
USGS Northern Prairie Wildlife Research Center
We give suggestions for the presentation of research results from frequentist, information-theoretic, and Bayesian analysis paradigms, followed by several general suggestions. The information-theoretic and Bayesian methods offer alternative approaches to data analysis and inference compared to traditionally used methods. Guidance is lacking on the presentation of results under these alternative procedures and on nontesting aspects of classical frequentist methods of statistical analysis. Null hypothesis testing has come under intense criticism. We recommend less reporting of the results of statistical tests of null hypotheses in cases where the null is surely false anyway, or where the null hypothesis is of little …
Statistics For Wildlifers: How Much And What Kind?, Douglas H. Johnson, Terry L. Shaffer, Wesley E. Newton
Statistics For Wildlifers: How Much And What Kind?, Douglas H. Johnson, Terry L. Shaffer, Wesley E. Newton
USGS Northern Prairie Wildlife Research Center
Quantitative methods are playing increasingly important roles in wildlife ecology and, ultimately, management. This change poses a challenge for wildlife practitioners and students who are not well educated in mathematics and statistics. Here we give our opinions on what wildlife biologists should know about statistics, while recognizing that not everyone is inclined mathematically. For those who are, we recommend that they take mathematics coursework at least through calculus and linear algebra. They should take statistics courses that are focused conceptually, stressing the "why" rather than the "how" of doing statistics. For less mathematically oriented wildlifers, introductory classes in statistical techniques …
Area Requirements Of Grassland Birds: A Regional Perspective, Douglas Johnson, Lawrence Igl
Area Requirements Of Grassland Birds: A Regional Perspective, Douglas Johnson, Lawrence Igl
USGS Northern Prairie Wildlife Research Center
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 …
Wolf-Bison Interactions In Yellowstone National Park, Douglas Smith, L. David Mech, Mary Meagher, Wendy Clark, Rosemary Jaffe, Michael Phillips, John A. Mack
Wolf-Bison Interactions In Yellowstone National Park, Douglas Smith, L. David Mech, Mary Meagher, Wendy Clark, Rosemary Jaffe, Michael Phillips, John A. Mack
USGS Northern Prairie Wildlife Research Center
We studied interactions of reintroduced wolves (Canis lupus) with bison (Bison bison) in Yellowstone National Park. Only 2 of 41 wolves in this study had been exposed to bison before their translocation. Wolves were more successful killing elk (Cervus elaphus) than bison, and elk were more abundant than bison, so elk were the primary prey of wolves. Except for a lone emaciated bison calf killed by 8 1-year-old wolves 21 days after their release, the 1st documented kill occurred 25 months after wolves were released. Fourteen bison kills were documented from April 1995 through …