The American Midland Naturalist

Articles from Vol. 141, No. 2, April

A Comparative Study of the Seedling-Juvenile and Flowering Stages of the Life Cycle in an Annual and a Perennial Species of Senna (Leguminosae; Caesalpinioideae)
ABSTRACT.-Various growth parameters and the requirements for flowering of Senna (=Cassia) marilandica, an herbaceous polycarpic perennial native to the eastern United States, and Senna (=Cassia) obtusifolia, a pantropical-warm temperate annual weed,...
Age, Size and Water Status of Acacia Gregii Influencing the Infection and Reproductive Success of Phoradendron Californicum
ABsTRACT.-The incidence of infection and reproductive success of Phoradendron californicum (desert mistletoe) on its host, Acacia greg (catclaw), was quantitatively investigated in two localities of the Las Vegas Valley, Nevada, from March through November...
Behavioral Response of Argiope Trifasciata to Recent Foraging Gain: A Manipulative Study
ABSTRACT.-This study investigates how recent foraging gain affects the web-building behavior of the garden spider, Argiope tnfasciata, especially stabilimentum-building. Adult female spiders in the field and in cages were randomly assigned to two groups,...
Cold Hardiness of the Woolly Bear Caterpillar (Pyrrharctia Isabella Lepidoptera: Arctiidae)
AssTRAGr.-Caterpillars of the eastern North American moth Pyrrha.rctia isabella (Lepidoptera: Arctiidae) overwinter under plant debris where they are exposed to subfreezing temperatures. We measured supercooling points (srs), susceptibility to ice formation...
Compatibility Relationships in Distylous Bluets: Houstonia Serpyllifolia and H. Longifolia (Rubiaceae)
ABSTRACT.-We performed hand-pollinations to assess the compatibility of crosses within and between long-styled (pin) and short-styled (thrum) morphs of Houstonia serpyllifolia and H. longifolia. For both species, percentage fruit-set and seed-set per...
Diet of the Ouachita Dusky Salamander (Desmognathus Brimleyorum) in Southeastern Oklahoma
ABSTRACT.-We studied the diet and prey selection of Desmognathus btimleyorum in southeastern Oklahoma relative to salamander size class and availability of prey. We found significant differences in prey consumed by large and small size classes. Also,...
Differences in Siphonal Anatomy between Dreissena Polymorpha and D. Bugensis (Mollusca: Dreissenidae) in Lake Ontario
ABSTRACT.-The Great Lakes region has come to be occupied by at least two species of Dreissena, the zebra mussel, D. polymorpha and the quagga mussel, D. bugensis. The species are distinguished on the basis of shell morphology and electrophoretic patterns....
Does Aggressive Behavior of Peromyscus Leucopus Influence Isolation of Habitat Islands?
ABSTRACT.-Fragmentation of habitat has been found to create dispersal barriers for some species. Less well understood is the possibility that physical barriers to dispersal between habitat patches might be reinforced or modified by behavioral barriers....
Does Balsam Fir (Abies Balsamea) Facilitate the Recruitment of Eastern Hemlock (Tsuga Canadesis)?
ABSTRACT.-Eastern hemlock ( Tsuga canadensis) was a major component of mesic forests in the Upper Great Lakes region, but presently persists in only a few locations. Many of these stands experience poor regeneration due to herbivory by white-tailed deer...
Effects of Habitat Area on the Occurrence of Grassland Birds in Illinois
ABSTRACT.-We documented the occurrence of 12 bird species within Prairie Ridge State Natural Area, Jasper County, Illinois, a matrix of nine grassland tracts (range 7-120 ha, totaling 489 ha), from 1994 to 1997 and analyzed the presence of these species...
Effects of Larval Food-Limitation on Vannessa Cardui Linnaeous (Lepidoptera: Nymphalidae)
ABSTRACT.-Larval food-limitation may be an important factor influencing growth of lepidopteran populations. We tested effects of food-limitation on larval growth of Vanessa cardui Linnaeus (Lepidoptera: Nymphalidae), the painted lady butterfly. Vanessa...
Genetic Polymorphisms in Fishers (Martes Pennanti)
ABSTRACT.-Genetic polymorphisms were investigated in fishers (Martes pennant/) using horizontal starch gel electrophoresis of allozymes. During the 199-1997 fisher trapping season muscle and liver samples were collected from animals in New Hampshire,...
Influence of Inundation Potential and Forest Overstory on the Ground-Layer Vegetation of Allegheny Plateau Riparian Forests
ABSTRACT.-In the nonglaciated Allegheny Plateau of northwestern Pennsylvania groundlayer plant communities of headwater riparian forests are among the most species-rich of the region. We examined the influence of inundation potential (geomorphic surfaces...
Life History of a Peripheral Population of Bluespotted Sunfish Enneacanthus Gloriosus (Holbrook), with Comments on Geographic Variation
ABSTRACT.-Enneacanthus gloriosus occurs in coastal plain drainages from New York to Florida and W to Mississippi, but little is known about its life history. Enneacanthus gloriosus is smaller and shorter-lived in Mississippi than in eastern populations....
Lumbricid Prey and Potential Herpetofaunal Predators of the Invading Terrestrial Flatworm Bipalium Adventitium (Turbellaria: Tricladida: Terricola)
ABSTRACT.-Bipalium advent%tium Hyman, an exotic terrestrial planarian invading North America, is an aggressive predator on earthworms. The spread and ecological impact of this flatworm will be determined in part by the its interactions with potential...
Morphometric Analysis of Salamanders of the Plethodon Vandykei Species Group
ABSTRACT.-We used discriminant analysis to examine morphological variation within the Plethodon vandykei species group. Significant differentiation was found among the nine samples used in the study. Canonical discriminant analysis and UPGMA clustering...
Nest Predation in Suburban and Rural Woodlots of Northern Ohio
ABSTRACT.-The intensity of nest predation in small woodlots was compared across three regions in Ohio: (I) suburban Cuyahoga County, (2) semirural Lorain County and (3) rural Huron County. Artificial nests, each holding three Japanese quail eggs, were...
Reproductive Cycle of Quadrula Metanevra (Bivalvia: Unionidae) in the Pickwick Dam Tailwater of the Tennessee River
A$sAcT.-Quadrula metanevra were collected monthly from Pickwick Dam tailwater (Tennessee River mile 201.3), Tennessee, between July 1988 and June 1990. A total of 227 specimens were examined. The population consisted primarily of dioecious individuals...
Response of Zizia Aurea to Seasonal Mowing and Fire in a Restored Prairie
ABSTRACT.-Zizza aurea (L.) Koch (Apiaceae) planted in a tallgrass restoration near Viola, Wisconsin, declined in numbers in randomly assigned plots left unburned or burned in May (41 to 9 and 63 to 30 individuals, respectively), but tripled in numbers...
The Effects of Bison Crossings on the Macroinvertebrate Community in a Tallgrass Prairie Stream
ABSTRACT.-The distribution and diversity of macroinvertebrates in relation to bison crossings was studied for four seasons in a headwater reach of a tallgrass prairie stream. Species richness was significantly higher above crossings only during the fall....
The Effects of Pollen Addition on Fruit Set and Sex Expression in the Andromonoecious Herb Horsenettle (Solanum Carolinense)
ABSTRACT.-Horsenet.tle (Solanum carolinense. Solanaceae) plants possess the ability to bear both hermaphroditic and male flowers on the same plant, a breeding system referred to as andromonoecy. As part of an ongoing investigation into the evolution...
The First Record of Cryptosis Parva for the Florida Keys
The genus Cryptotis is ubiquitous throughout the eastern United States (Hall, 1981) and although it occurs in peninsular Florida, it has never been recorded from the Florida Keys. Schwartz (1952) hypothesized that insectivores were absent from Key Largo...
Vegetation Biomass Dynamics and Patterns of Sexual Reproduction in a Northern Mixed-Grass Prairie
ABSTRACT.-The sustainability of natural grasslands is in large part dependent upon the successful ingress and propagation of alien plant species. We attempted to characterize the propagation potential of the dominant plant species of a southeastern Montana...