The American Midland Naturalist

Articles from Vol. 150, No. 1, July

Additional Habitat, Diet and Range Information for the White-Footed Vole (Arborimus Albipes)
ABSTRACT.-Little is known about the natural history of the white-footed vole (Arborimus albipes). We present new information on habitat, diet and range of this mammal as a result of 13 captures in the southern Cascade Range of western Oregon. The study...
Analysis of Spatial Patterns and Spatial Association between the Invasive Tree-of-Heaven (Ailanthus Altissima) and the Native Black Locust (Robinia Pseudoacacia)
ABSTRACT.-Invasive exotic plants can persist and successfully spread within ecosystems and negatively affect the recruitment of native species. The exotic invasive Ailanthus altissima and the native Robinia pseudoacacia are frequently found in disturbed...
Body Mass and Antler Development Patterns of Rocky Mountain Elk (Cervus Elaphus Nelsoni) in Michigan
ABSTRACT.-We documented mean and maximum body mass, mass accretion patterns and antler development patterns of Rocky Mountain elk in Michigan. Mean body mass of bulls averaged 9-11% heavier, and maximum body mass 23-27% heavier, in Michigan than in other...
Changes in Breeding Bird Populations with Habitat Restoration in Northern Iowa
ABSTRACT.-Native tallgrass prairie and wetland habitat in the Prairie Pothole Region of the United States have declined over the past two centuries. Bird communities using these habitats have also experienced widespread declines that are often attributed...
Composition and Demographics of Beaver (Castor Canadensis) Colonies in Central Illinois
ABSTRACT.-Beavers (Castor canadensis) exhibit wide variations in colony composition and demographics over their broad geographic range, so regional population studies are important for sound management of this species. The objectives of this study were...
Distribution of Eastern Chipmunks (Tamias Striatus) in the Shawnee National Forest, Southern Illinois: Why Are They Missing from the Eastern Shawnee?
ABSTRACT.-We live-trapped small mammals at 12 sites and compiled data from 3 previous live-trapping studies to document the distribution of the eastern chipmunk (Tamias striatus) in the Shawnee National Forest (SNF) in southern Illinois. Chipmunks were...
Fitness Costs and Benefits Associated with Dispersal in Northern Bobwhites (Colinus Virginianus)
ABSTRACT.-Movements and dispersal distances are fundamental aspects of ecology and evolutionary biology. Northern bobwhites (Colinus virginianus) generally are considered the least mobile of all gallinaceous species, but dispersal events of bobwhites...
Franklin's Ground Squirrel (Spermophilus Franklinii) in Illinois: A Declining Prairie Mammal?
ABSTRACT.-Franklin's ground squirrel (Spermophilus franklinii) appears to be becoming increasingly uncommon in the eastern portion of its range, but current data on its status in Illinois are lacking. We conducted a mail survey of 166 wildlife professionals...
Geomorphic, Water Quality and Fish Community Patterns Associated with the Distribution of Notropis Topeka in a Central Missouri Watershed
ABSTRACT.-The Topeka shiner (Notropis topeka) is a small native cyprinid species that has declined throughout its range in the Central Great Plains Region of the United States. Declines of the species have been associated with numerous factors including...
Habitat Associated with Daytime Refugia of Fox Squirrels in a Longleaf Pine Forest
ABSTRACT.-Fox squirrel (Sciurus niger) populations are declining in many areas of the eastern United States, and habitat loss may be partly responsible for these declines. We measured habitat variables at fox squirrel refuge sites and random sites and...
Influence of Canopy Closure and Shrub Coverage on Travel along Coarse Woody Debris by Eastern Chipmunks (Tamias Striatus)
ABSTRACT.-We investigated relationships between canopy closure, shrub cover and the use of coarse woody debris as a travel path by eastern chipmunks (Tamias striatus) in the north central United States. Fine scale movements of chipmunks were followed...
Leaf Scraping Beetle Feces Are a Food Resource for Tree Hole Mosquito Larvae
ABSTRACT.-In tree holes, leaf scraping scirtid beetles increase the rate at which leaf litter is converted to fine particles, which may benefit fine particle feeding mosquitoes if these fine particles are valuable to mosquitoes. We tested whether the...
Population Differences in Effects of Fish on Physa Integra Refuge Use
ABSTRACT.-Prey populations exposed to different sets of predators often adopt distinct antipredalor behaviors. We investigated the refuge use of a freshwater pulmonate snail, Physa integra, in the presence and absence offish predators. Over 80% of snails...
Prescribed Fire's Impact on Water Quality of Depressional Wetlands in Southwestern Georgia
ABSTRACT.-Depressional wetlands are a natural feaUire of the longleaf pine-wiregrass ecosystem on the southeastern Coastal Plain. Fire is an essential part of the longleaf pine forest with prescribed burns occurring at 1-3 y intervals. In 2000 and 2001...
Relationships of Ruffed Grouse (Bonasa Umbellus) Home Range Size to Landscape Characteristics
ABSTRACT.-We investigated how size and spatial arrangement of landscape-level habitat types influenced home range size of ruffed grouse (Bonasa umbllus) in Virginia. Grouse home ranges were overlaid onto a GIS database derived from Landsat TM imagery...
Ruffed Grouse (Bonasa Umbellus) Brood Microhabitat Selection in the Southern Appalachians
ABSTRACT.-Brood cover is a critical component of ruffed grouse habitat during a period when chick mortality may be high. We compared microhabitat characteristics at ruffed grouse (Bonasa umbellus) brood locations with random locations to determine characteristics...
Status of the Freshwater Mussel Communities of the Sydenham River, Ontario, Canada
ABSTRACT.-The Sydenhara River, a tributary to Lake St. Clair in southwestern Ontario, historically supported the richest freshwater mussel community of any river in Canada. Surveys conducted between 1971 and 1991 suggested that the mussel fauna was in...
The Effects of Isolation, Habitat Area and Resources on the Abundance, Density and Movement of the Butterfly Parnassius Smintheus
ABSTRACT.-We examined the effects of isolation and site size on the abundance, density, emigration and immigration of the butterfly Parnassius smintheus in a series of sub-alpine meadows. Site size was measured either as habitat area or as number of...
The Relationship between Breeding by the Gopher Frog, Rana Capito (Amphibia: Ranidae) and Rainfall
ABSTRACT.-Declines in amphibian species have become a worldwide concern. This concern is heightened by predicted global climatic changes that may result in shifts in current patterns of local precipitation. Because of the potential dependence of successful...
Use of Bison Wallows by Anurans on Konza Prairie
ABSTRACT.-Historically, bison were of great importance to the grassland ecosystem, affecting plants and other organisms directly through grazing and indirectly by creating soil disturbances, such as wallows. When bison were reintroduced to the Konza...
Visual Signals in the Crepuscular Common Nighthawk (Chordeiles Minor)
ABSTRACT.-The common nighthawk ( Chordeiles minor) is a crepuscular species known to use visual signals for agonistic and sexual communication. To test the hypothesis that white plumage patches function in visual communication of reproductive quality,...