The American Midland Naturalist

Articles from Vol. 146, No. 1, July

Allozymic Variation of the Endangered Delmarva Fox Squirrel (Sciurus Niger Cinereus): Genetics of a Translocated Population
ABSTRACT.-We examined allozymic variation at 42 loci in a translocated population of the endangered Delmarva fox squirrel, Sciurus niger cinereus, as well as the naturally occurring (source) population from which individuals were obtained to establish...
Are Female Voles Food Limited? Effects of Endophyte-Infected Tall Fescue on Home Range Size in Female Prairie Voles (Microtus Ochrogaster)
ABSTRACT.-Space use patterns of female voles may or may not be related to quality and quantity of food available. We examined the relationship between food quality and home range size in female prairie voles (Microtus ochrogaster) by radiotracking voles...
Associations of Grassland Birds with Landscape Factors in Southern Wisconsin
ABSTRACT.-We investigated the association of grassland birds with field- and landscape-- level habitat variables in south-central Wisconsin during 1985-1987. Landscape-level variables were measured and digitized at 200, 400 and 800 m from the perimeter...
Burrows and Burrow-Cleaning Behavior of House Mice (Mus Musculus Domesticus)
ABSTRACT.-Burrow systems constructed by house mice (Mus musculus domesticus) in four large outdoor enclosures were excavated. Burrows ranged from 10-835 cm in length, contained 1-7 entrance holes and had 1-8 distinct tunnel segments and 0-5 cavities....
Coyote (Canis Latrans) Food Habits in a Tropical Deciduous Forest of Western Mexico
ABSTRACT.-We studied the food habits of the coyote (Canis latrans) in a tropical deciduous forest along the Mexican Pacific coast during 1996 and 1997. Small mammals, chiefly the Jaliscan cotton rat (Sigmodon mascotensis), were the main prey items during...
Density of Prairie Skinks (Eumeces Septentrionalis) in Old-Field Habitats
ABSTRACT.-From 1996-1998 I estimated the density of prairie skinks (Eumeces septentrionalis) in old fields and evaluated the influence of habitat characteristics on density. I estimated prairie skink density from a trapping grid using a mark-recapture...
Effect of Garlic Mustard [Alliaria Petiolata (Beib. Cavara & Grande)] Extracts on Plants and Arbuscular Mycorrhizal (AM) Fungi
ABsTRACT.-We examined the effects of garlic mustard (Alliaria petiolata) leachates on germination of arbuscular mycorrhizal (AM) fungal spores, colonization of plant roots by AM fungi and germination and root growth of monocot and dicot plants under...
Effects of White-Tailed Deer (Odocoileus Virginianus) on Plants, Plant Populations and Communities: A Review
ABSTRACT.-Large effects of white-tailed deer (Odocoileus virginianus) upon individual plants, plant populations and communities have been documented in a number of studies. However, well-supported experimental measures of the magnitude and geographical...
Hydroperiod Influence on Breakdown of Leaf Litter in Cypress-Gum Wetlands
ABSTRACT.-Many cypress-gum wetlands in the southeast United States are isolated from rivers and streams and are seasonally inundated by rainfall. Organic matter processing in these wetlands is caused primarily by biotic components (i.e., microbes and...
Impacts of a Flood on Small Mammal Populations of Lower Missouri River Floodplain Forests
ABSTRACT.-Small mammal responses to flooding in the lower Missouri River floodplain are poorly understood. Our study examined the survival of marked populations of small mammals in mature and regenerating forest seral stages in response to a brief flood....
Leg Autotomy in the Wolf Spider Pardosa Milvina: A Common Phenomenon with Few Apparent Costs
ABSTRACT.-A number of animals escape predation by sacrificing a body part. Spiders commonly lose legs in encounters with predators or conspecifics. We investigated the frequency of leg loss and its affect on locomotion and prey capture activities of...
Mitochondrial Cytochrome B Sequences Support Recognition of Two Cryptic Species of Plaines Killifish, Fundulus Zebrinus and Fundulus Kansae
ABSTRACT.-The current literature treats the plains killifish as a single species (Fundulus zebrinus). However, a recent range-wide survey of genetic variation detected two distinct groups. The presence of the two groups suggests that the plains killifish...
Ontogeny of Deer Mice (Peromyscus Maniculatus) and Montane Voles (Microtus Montanus) as Owl Prey
ABSTRACT.-Frequencies of size classes of deer-mice (Peromyscus maniculatus) femora and humeri from a sample of what are believed to be barn-owl (Tyto alba) pellets collected from Columbia County, southeastern Washington, indicate that most prey were...
Population Genetic Structure of the Self-Compatible Annual Herb; Polygonum Thunbergii (Polygonaceae) Detected by Multilocus DNA Fingerprinting
ABSTRACT-The spatial genetic structure of Polygonum thunbergii was investigated by DNA fingerprinting, using an oligonucleotide probe (GACA)4 and restriction enzyme Dra I. The genetic similarity of DNA fingerprints among 15 plants collected over a distance...
Responses of Generalist Predators Fed High-Ni Melanotrichus Boydi (Heteroptera: Miridae): Elemental Defense against the Third Trophic Level
ABSTRACT.-The recent discovery of herbivores that feed on Ni-hyperaccumulating plants and contain elevated Ni concentrations in their bodies suggests that Ni may be transferred to their predators. We tested this hypothesis using the high-Ni herbivore...
Sexual Dimorphism in Functional Response and Trophic Morphology in Rabidosa Rabida (Araneae: Lycosidae)
ABSTRACT.-We investigated sexual dimorphism in feeding behavior and morphological characteristics associated with prey capture in the wolf spider, Rabidosa rabida (Araneae, Lycosidae). Female R. rabida attack and consume more prey than do males. In addition...
Spatial Organization of Bobcats (Lynx Rufus) in Southern Illinois
ABSTRACT.-Many aspects of spatial organization in solitary carnivores remain unknown due to prohibitively low sample sizes and reliance on only annual home range and overlap data. We estimated size, overlap and fidelity of annual and seasonal home ranges...
Temporal Patterns of Bird Abundance in Cornfield Edges during the Breeding Season
ABSTRACT.-Bird abundance in cornfield edges in Iowa was documented from mid-April through early August 1992. During this period the barren, sparsely vegetated fields are transformed into fields with dense plant cover; the availability of food resources...
The Effect of Suburban and Agricultural Development on the Activity Patterns of Coyotes (Canis Latrans)
ABSTRACT.-We compared the activity patterns of coyotes (Canis latrans) in a suburban/ agricultural area to those in an adjacent undeveloped area in northwest Wyoming from August 1998 to August 1999. Activity patterns were recorded using variable-pulse...
Top-Down Control by the Red Imported Fire Ant (Solenopsis Invicta)
ABSTRACT.-Top-down control by predaceous insects has rarely been demonstrated in terrestrial communities, but invasive species may be particularly suited to exert such control. The red imported fire ant, Solenopsis invicta, has strong interactions with...
Year-to-Year Reuse of Tree-Roosts by California Bats (Myotis Californicus) in Southern British Columbia
ABSTRACT.-To document year-to-year reuse of roost trees by forest-dwelling bats we monitored trees in southern British Columbia that we first identified as maternity roosts of California bats (Myotis californicus) in 1995. Initially we identified roost...