The American Midland Naturalist

Articles from Vol. 148, No. 2, October

A Comparison of Population Survey Techniques for Swift Foxes (Vulpes Velox) in New Mexico
ABSTRACT.-We compared survey techniques for estimating relative and absolute abundances of swift foxes (Vulpes velox) in New Mexico. For relative abundance surveys, the most efficient technique is collection of scats followed by verification of species...
Activity, Reproduction and Overwintering Behavior of Ornate Box Turtles (Terrapene Ornata Oranta) in the Nebraska Sandhills
ABSTRACT.-Activity, reproduction and overwintering behavior were investigated in a radio-telemetry study of ornate box turtles (Terrapene ornata Ornata) in the Sandhills region of Nebraska between 1997 and 1999. Based on 477 radio-locations where activity...
A Hierarchical Analysis of Seed Production by Alnus Rubra
ABSTRACT.-This study examined variation in the total number of seed, the number and percent of viable seed produced per catkin in red alder (Alnus rubra) across the following five levels of plant organization: stands, individual trees within stands,...
Assessing the Progress of a Tallgrass Prairie Restoration in Southern Wisconsin
ABSTRACT.-Assessments of ecosystem restorations are necessary to improve restoration practices and goals. Restoration assessments, whether quantitative or qualitative, are also a vital part of managing previously degraded ecosystems. This study examined...
Calcium as a Limiting Factor in Distribution of the Amphipod Gammarus Pseudolimnaeus
ABSTRACT.-The amphipod Gammarus pseudolimnaeus is abundant throughout most of the length of two small streams on the coastal plain of Virginia, but is absent from their upper reaches. The streams begin as very dilute springs but exhibit a downstream...
Diet, Microhabitat Use and Seasonal Activity Patterns of Gray Squirrels (Sciurus Carolinensis) in Hammock and Upland Pine Forest
ABSTRACT.-Gray squirrels (Sciurus carolinensis) are an important component of forest ecosystems in the eastern United States, but their ecology in subtropical habitats remains unstudied. This study was conducted on a population of gray squirrels in a...
Evidence of Tissue-Specific Allelopathic Activity in Euthamia Graminifolia and Solidago Canadensis (Asteraceae)
ABSTRACT.-Euthamia graminifolia and Solidago canadensis may be found growing in dense, essentially monospecific, stands. One hypothesis to explain this phenomenon is that both of these goldenrods, as do many related taxa in Asteraceae, release allelochemicals...
Failure of Adult Recruitment in Quercus Buckleyi Populations on the Eastern Edwards Plateau, Texas
ABSTRACT.-In many semiarid regions woodlands, savannas and grasslands form an unstable landscape mosaic; the physiognomy of a particular patch in the mosaic changes over time. To explain such temporal and spatial variation in tree abundance in semiarid...
Habitat Use by Larval Mosquitos in West Virginia
ABSTRACT.--Surveys for larval mosquitoes were conducted in West Virginia from 1992 through 1997. A total of 26 species were identified with the frequency of occurrence for each species determined by elevation category, month of collection and association...
Long-Distance Movements in Cotton Rats (Sigmodon Hispidus) and Prairie Voles (Microtus Ochrogaster) in Northern Kansas
ABSTRACT.-Long-distance dispersal is an important phenomenon in both theoretical and applied population biology, yet empirical data are difficult to collect. We analyzed long-- distance movement data for cotton rats (Sigmodon hispidus) and prairie voles...
Nonfruiting Hermaphroditic Flowers as Reserve Ovaries in Solanum Carolinense
ABSTRACT.-Two alternative hypotheses may account for the low fruit:flower ratios regularly observed in many species of plants. First, a low fruit:flower ratio may be a passive "nonadaptive" consequence of external stressors that destroy flowers or limit...
Observations on Feeding Behavior by the Terrestrial Flatworm Bipalium Adventitium (Platyhelminthes: Tricladida: Terricola) from Illinois
ABSTACT.-Bipalium adventitium Hyman, 1943, an exotic terrestrial flatworm that is predatory on earthworms, is reported from Illinois for the first time. No-choice laboratory feeding tests were performed to test the acceptability of several lumbricid...
Seasonal Variation in the Helminth Community of the Brown Anole, Anolis Sagrei (Sauria: Polychrotidae), from Oahu, Hawaii
Notes and Discussion ABSTRACT.-Seasonal prevalence and abundance of helminth species in an introduced population (Oahu, Hawaii) of the brown anole Anolis sagrei were examined. One species of Cestoda Oochoristica sp., four species of Nematoda Atractis...
Sex- and Age-Specific Patterns of Mineral Lick Use by White-Tailed Deer (Odocoileus Virginianus)
ABSTRACT.-Little is known regarding the influence of sex- and age-specific factors on mineral lick use by white-tailed deer (Odocoileus virginianus). We recorded 1020 visits to mineral licks by deer between April and September, of which we could classify...
Spatial Relationships of Male Green Frogs (Rana Clamitans) throughout the Activity Season
ABSTRACT.-The spatial relationships exhibited by individuals in a population may indicate their social organization. In territorial species interactions between individuals should lead to maximal spacing in a uniform pattern. Using nearest neighbor distances...
Spatio-Temporal Relationships among Adult Raccoons (Procyon Lotor) in Central Mississippi
ABSTRACT.-We monitored 131 (99 male, 32 female) radiocollared raccoons (Procyon lotor) from January 1991 to December 1997 on the Tallahala Wildlife Management Area, Mississippi. We examined inter- and intrasexual spatial relationships and temporal interactions...
Spread of the Invasive Alien Vine Vincetoxicum Rossicum: Tradeoffs between Seed Dispersability and Seed Quality
ABSTRACT.-The relationship between seed weight, dispersal ability and seed "quality" was tested for the seeds of pale swallow-wort Vincetoxicum rossicum (Kleo.) Barb., an invasive alien Nine. In a field release, small seeds traveled significantly farther...
The Effect of Prescribed Burning on Epigeic Springtails (Insecta: Collembola) of Woodland Litter
ABSTRACT.-Species richness, frequency and density of litter-dwelling springtails (Collembola) were analyzed from woodland litter samples collected for 4 y, over a 12 y interval, from The East Woods of The Morton Arboretum, Lisle, Illinois. The 162 samples...
The Effects of Proximity and Colony Age on Interspecific Interference Competiton between the Desert Ants Pogonomyrmex Barbatus and Aphaenogaster Cockerelli
ABSTRACT.-The ants Aphaenogaster cockerelli and Pogonomyrmex barbatus compete for seed resources in the Chihuahuan desert. Previous work showed that intraspecific competition in P. barbatus is more intense between near neighbors with overlapping foraging...
Use by Bats of Patches of Residual Trees in Logged Areas of the Boreal Forest
ABSTRACT.-Previous studies have shown that bat activity is greater along forest-clearcut edges than in the center of clearcuts or in the forest interior. Residual patches of trees in logged areas may also provide habitat for bats. To investigate this,...
Weak Trophic Interactions among Birds, Insects and White Oak Saplings (Quercus Alba)
ABSTRACT.-We examined the interactions among insectivorous birds, arthropods and white oak saplings (Quercus alba L.) in a temperate deciduous forest under 'open' and 'closed' canopy environments. For 2 y, we compared arthropod densities, leaf damage...