The American Midland Naturalist

Articles from Vol. 156, No. 2, October

Annual Dynamics of Bobcat (Lynx Rufus) Home Range and Core Use Areas in Mississippi
ABSTRACT.-We investigated the annual dynamics of bobcat (Lynx rufus) home range and core use areas by radiotracking 23 female and 6 male bobcats from 10 January 1989 to 31 January 1998 in Mississippi. We quantified space use by measuring changes in the...
Comparative Analysis of Goldenseal (Hydrastis Canadensis L.) Population Re-Growth Following Human Harvest: Implications for Conservation
ABSTRACT.-Goldenseal is an uncommon woodland herb whose rhizomes are widely harvested for their medicinal properties. Goldenseal populations regenerate from vegetative propagules that are broken-off from the primary rhizome during harvesting activities....
Conservation Implications of Individual Scale Spatial Pattern in the Threatened Dune Thistle, Cirsium Pitcheri
ABSTRACT.-For plants and other sessile organisms, the dispersion of individuals in a population can influence the strength of ecological interactions, and can have important implications for the conservation of these species. We investigated the spatial...
Distribution of the Imperiled Williams' Crayfish (Orconectes Williamsi) in the White River Drainage of Missouri: Associations with Multi-Scale Environmental Variables
ABSTRACT.-The imperiled crayfish Orconectes williamsi is found only in the upper White River drainage in Missouri and Arkansas, and is known from only nine localities in four Missouri counties. Its distribution has never been thoroughly assessed. Knowledge...
Ecology of Young Stream Resident Warner Sucker (Catostomus Warnerensis) in Warner Basin, Oregon
ABSTRACT.-We visually censused Warner sucker cohorts in a low gradient stream reach and determined microhabitat use from random availability data. For above-water visual censuses (AVC), we counted aggregations while slowly wading through Honey Creek...
Effects of White-Tailed Deer on Tsuga Canadensis Regeneration: Evidence of Microsites as Refugia from Browsing
ABSTRACT.-Both herbivory and windthrow disturbances have individually been shown to dramatically alter the structure and composition of forest communities; however, the interaction of these two factors has scarcely been examined. Windthrow disturbance...
Fire Regime of an Ozark Wilderness Area, Arkansas
ABSTRACT.-Many of the present day issues associated with fire management in wilderness areas are addressed by studying past interactions among fire, humans, vegetation and climate. In this paper we describe three centuries of the fire regime in the Lower...
Growth, Body Condition, Reproduction and Survival of Stocked Barrens Topminnows, Fundulus Julisia (Fundulidae)
ABSTRACT.-We documented the fate of 29 cohorts of propagated Barrens topminnows Fundulus julisia stocked as juveniles and adults (n^sub total^ = 2770 fish) into 17 springheads and small ponds in middle Tennessee in 2003 and 2004. Annual mortality rates...
Impacts of Channelization on Stream Habitats and Associated Fish Assemblages in East Central Indiana
ABSTRACT.-The objective of this study was to determine the relationship between fish assemblage and habitat in streams dominated by an agricultural landscape. Fishes from 20 natural and 20 channelized streams were sampled using electrofishing gear in...
Influence of Water Flow on Neosho Madtom (Noturus Placidus) Reproductive Behavior
ABSTRACT.-The Neosho madtom is a small, short-lived catfish species endemic to gravel bars of the Neosho River in Kansas, Oklahoma and Missouri, U.S.A. It spawns during summer in nesting cavities excavated in gravel. Although the species has survived...
Intergeneric Spawning between Captive Female Sacramento Perch (Archoplites Interruptus) and Male Rock Bass (Ambloplites Rupestrus), Teleostei: Centrarchidae
ABSTRACT.-The North American freshwater fish family Centrarchidae is well known for extensive natural hybridization, but there are no reports of voluntary spawning between genera. We document courtship and spawning in an aquarium between two separate...
Invasion of Downy Brome (Bromus Tectorum L.) Causes Rapid Changes in the Nitrogen Cycle
ABSTRACT.-Invasion of exotic species threatens the stability of ecosystems and is regarded as a significant component of global ecological change. One of the most successful invasive species of the intermountain west of the United States is Bromus tectorum...
Population Dynamics of Meadow Voles and Feral House Mice on a Dredge Disposal Site
ABSTRACT.-We examined population dynamics of two species of small mammals, Mus musculus (house mouse) and Microtus pennsylvanicus, (meadow vole), in a highly disturbed dredge disposal site in eastern Virginia. Using mark-release-recapture methods, we...
Recovery of Aquatic Macroinvertebrate Communities from Drought in Georgia Piedmont Headwater Streams
ABSTRACT.-Drought is an important disturbance in stream ecosystems. From 1998-2002 Georgia suffered a major drought, causing many headwater streams to experience reduced flows or to dry completely. Six headwater streams in the Georgia Piedmont were selected...
Response of Rocky Mountain Elk (Cervus Elaphus) to Wind-Power Development
ABSTRACT.-Wind-power development is occurring throughout North America, but its effects on mammals are largely unexplored. Our objective was to determine response (i.e., home-range, diet quality) of Rocky Mountain elk ( Cervus elaphus) to wind-power...
Reticulate Melanism in Western Painted Turtles (Chrysemys Picta Bellii): Exploring Linkages with Habitat and Heating Rates
ABSTRACT.-In western painted turtles (Chrysemys picta bellii), males often exhibit one of two morphs: (1) a reticulated form, characterized by an intricate network of dark markings on the carapace or (2) a non-reticulated form. Although several hypotheses...
Sociality among Foraging Ardeidae: Does Plumage Coloration Influence Nearest-Neighbor Spacing?
ABSTRACT.-Increased sociality in herons, family Ardeidae, is often considered to be associated with the occurrence of white plumage. If white plumage increases sociality, we hypothesized that white-plumaged birds should forage closer to one another and...
Status and Distribution of the Streamside Salamander, Ambystoma Barbouri, in Middle Tennessee
ABSTRACT.-Middle Tennessee populations of the Streamside Salamander, Ambystoma barbouri, delimit the southern extent of the species' range and are geographically isolated from more northerly populations. Few populations have been discovered in Tennessee,...
The Evolution of American Ecology 1890-2000
The Evolution of American Ecology 1890-2000, Sharon E. Kingsland, The Johns Hopkins University Press, Baltimore, 2005, ISBN 0-8018-8171-4.Ecology became recognized as a science in the 189Os when this volume begins, but it was many decades before it was...