The American Midland Naturalist

Articles from Vol. 151, No. 1, January

Allometric Equations for Estimation of Ash-Free Dry Mass from Length Measurements for Selected European Earthworm Species (Lumbricidae) in the Western Great Lakes Region
ABSTRACT.-In the last decade the invasion of European earthworms into previously wormfree glaciated areas of North America has stimulated research into their impacts on native forest ecosystems in the region. As a first approximation, the impacts of...
Ectoparasites of a Threatened Insular Endemic Mammalian Carnivore: The Island Spotted Skunk
ABSTRACT.-Parasites have been identified as potential threats to mammalian carnivores, particularly insular species. We evaluated external parasites on island spotted skunks (Spilogale gracilis amphiala), a threatened insular endemic carnivore on Santa...
Edge Effects on Nesting Dickcissels (Spiza Americana) in Relation to Edge Type of Remnant Tallgrass Prairie in Kansas
ABSTRACT.-Edge effects on grassland-nesting birds should be less pronounced or absent near cropland edges of grasslands that lack wooded-edge habitat often used by nest predators and brood parasites. We compared nest predation, brood parasitism and densities...
Effect of Competition on Plant Allometry and Defense
ABSTRACT.-A series of experiments was conducted to examine the effects of competition on allometry and defense using tomato plants (Lycopersicon esculentum). No mortality occurred over the 4-wk test period, even with a plant density of 30 plants per...
Effect of Supplemental High-Fat Forage on Body Composition in Wild Meadow Voles (Microtus Pennsylvanicus)
ABSTRACT.-We evaluated the effect of dietary fat on body fat of meadow voles (Microtus pennsylvanicus) in the field after a 6-wk supplemental feeding period with a 25% dietary-fat food. The initial 3-wk period showed no difference in body composition,...
Estimating Survival and Recruitment in a Freshwater Mussel Population Using Mark-Recapture Techniques
ABSTRACTT.-We used a mark-recapture method and model averaging to estimate apparent survival, recruitment and rate of population growth in a native freshwater mussel population at a site on the Cacapon River, which is a tributary to the Potomac River....
Fish Assemblage Dynamics in an Adventitious Stream: A Landscape Perspective
ABSTRACT.-Recent studies of stream fish assemblages have begun to incorporate landscape properties in explaining the dynamics seen at individual sites in riverine systems. In this approach, stream and river landscapes (riverscapes) are viewed over greater...
Ground-Dwelling Spider Assemblages Inhabiting Riparian Forests and Hedgerows in an Agricultural Landscape
ABSTRACT.-Generalist predators, such as spiders, play an important role as natural enemies in agroecosystems and, given the annual disturbance of most field crops, these predators typically re-colonize fields from adjacent habitats such as hedgerows...
Helminth Parasites of the Pacific Fat Sleeper, Dormitator Latifrons (Richardson, 1844) (Osteichthyes: Eleotridae) from Tres Palos Lagoon, Guerrero, Mexico
ABSTRACT.-A total of 48 adults Pacific fat sleepers Dormitator latifrons was collected from Tres Palos Lagoon, Guerrero, Mexico, between May and August 1999. Seven helminth taxa were recovered: Clinostomum complanatum, Pseudoacanthostomum panamense,...
Indexing Swift Fox Populations in New Mexico Using Scats
ABSTRACT.-We examined collection of scats (feces) as a survey method for indexing statewide populations of swift foxes (Vulpes velox). We searched for scats on 99 transects throughout the range of swift foxes in New Mexico. Swift fox scats were found...
Ontogeny of Larval Greater Redhorse (Moxostoma Valenciennesi)
ABSTRACT.-Adult greater redhorse Moxostoma valenciennesi, were seined from the Grand River, Ontario, and artificially spawned in May 1997 and May 1998. Eggs hatched after 6-8 d at a mean temperature of 19 C. Eggs and larval development of 9-22-mm specimens...
Partitioning of Food Resources by Syntopic Eastern Red (Lasiurus Borealis), Seminole (L. Seminolus) and Evening (Nycticeius Humeralis) Bats
ABSTRACT.-We evaluated partitioning of food resources among syntopic eastern red (Lasiurus borealis), Seminole (L. seminolus) and evening (Nycticeius humemlis) bats at the Savannah River Site, South Carolina, from June through August of 1996 and 1997....
Population Characteristics of Virginia Opossum in the Cross Timbers during Raccoon Reduction
ABSTRACT.-Mesopredator populations arc increasing because of habitat fragmentation and elimination of keystone predators. An increase of mesopredators, such as the raccoon (Procyon lotor) and Virginia opossum (Didelphis virginiana), may change competitive...
Potential Geographic Distribution of Anoplophora Glabripennis (Coleoptera: Cerambycidae) in North America
ABSTRACT.-The potential for ecological and economic damage caused by invasive species is only beginning to be appreciated. A recently arrived, and particularly worrisome, invader in North America is the Asian longhorned beetle Anoplophora glabripennis...
Reproduction in Etheostoma Zonale across Three Breeding Seasons in Ohio
ABSTRACT.-Etheostoma zonale was collected from the Hocking River in south-central Ohio from April 1999 through August 2001. Ovaries of adult females were classified by developmental stage and appropriate-stage ovaries were used to analyze clutch size,...
Roost Selection and Roosting Behavior of Male Common Nighthawks
ABSTRACT.-Many studies to date have documented clear energetic costs and benefits of avian roost selection. Male Common Nighthawks (Chordeiles minor) spend at least half of each day during the summer on a day-roost. Therefore selection of roost-sites...
Shifting Sands in Florida Scrub Gaps and Roadsides: Dynamic Microsites for Herbs
ABSTRACT.-Florida scrub grows on relict beach ridges with xeric sands, which arc constantly transported by wind and water. These sand movements are likely affect microsites occupied by Florida scrub herbs and their demography. We analyzed temporal variation...
Survival and Cause-Specific Mortality among Furbearers in a Protected Area
ABSTRACT.-Information is needed on protected furbearer communities to help understand the ecological impacts of trapping pressure on furbearer populations. We monitored coyotes (Canis latrans), bobcats (Lynx rufus), raccoons (Procyon lotor) and opossums...
The Effect of Female Prairie Vole (Microtus Ochrogaster) Immigrants on Space Use of Conspecific Female Residents
ABSTRACT.-We tested the hypothesis that female prairie vole (Microtus ochrogaster) residents change their space use patterns in response to immigration pressure. We established prairie vole populations in four 32 × 32-m enclosures during 2000 and 2001....
The Life of a Fire-Adapted Florida Goldenrod, Solidago Odora Var. Chapmanii
ABSTRACT.-We studied the ramet dynamics of Chapman's goldenrod [Solidago odora var. chapmanii (A. Gray) Cronquist] in burned Florida scrub and sandhill by monitoring permanent quadrats for 10 y, excavating to reveal clonal structure and postfire responses...
The Scientific Names Notropis Stramineus (Cope) and N. Ludibundus (Girard)
ABSTRACT.-Two scientific names referring to the sand shiner have appeared in the literature during the past decade. A ruling by the International Commission on Zoological Nomenclature in 2002 (Opinion, 1991) conserved the more commonly used name, Notrojm...