The American Midland Naturalist

Articles from Vol. 151, No. 2, April

Abundance and Species Richness of Shrews within Forested Habitats on Prince Edward Island
ABSTRACT.-Little is known about the small mammalian fauna of Prince Edward Island, particularly shrews. Although historical data indicate the presence of five shrew species on PEI (Sorex cinereus, S. fumeus, S. hoyi, S. palustris and Blarina brevicauda),...
Abundance of Ohio Shrimp (Macrobrachium Ohione) and Glass Shrimp (Palaemonetes Kadiakensis) in the Unimpounded Upper Mississippi River
ABSTRACT.-Large rivers of the United States have been altered by construction and maintenance of navigation channels, which has resulted in habitat loss and degradation. Using 7 y of Long Term Resource Monitoring Program data collected from the unimpouncled...
Age Affects the Risk of Sexual Cannibalism in Male Crab Spiders (Misumena Vatia)
ABSTRACT.-In certain arthropod groups, including spiders, males seeking copulations may expose themselves to cannibalism from females that are larger and stronger than they are. Although old males are commonly believed to be particularly vulnerable to...
Allegheny Woodrat (Neotoma Magister) Use of Rock Drainage Channels on Reclaimed Mines in Southern West Virginia
ABSTRACT.-Allegheny woodrats (Neotoma magister) currently receive protected status throughout their range due to population declines. Threats associated with habitat fragmentation (e.g., introduced predators, disease, loss of connectivity among subpopulations...
Badger Predation on Yellow-Bellied Marmots
ABSTRACT.-Badger (Taxidea taxus) activity was recorded in colonies of yellow-bellied marmots (Marmota flaviventris) during behavioral observations and trapping. Badgers were observed seven times in a marmot colony and extensive digging at marmot burrows...
Differential Tree Colonization of Old Fields in a Temperate Rain Forest
ABSTRACT.-Most old fields in the Queets Valley of Olympic National Park, USA, remain dominated by exotic herbs 60 y after abandonment although the fields are surrounded by temperate rain forest. However, areas of some fields have been invaded by Picea...
Do Dandelion Flowers Influence Seed Set of a Native Plant (Delphinium Nuttallianum) in Subalpine Meadows?
ABSTRACT.-Experimental removal of flower heads of Taraxacum officinale (Common Dandelion) tested whether the presence of these showy yellow flowers affected seed production of Delphinium nuttallianum in natural populations where both species are visited...
Effects of Hydrology, Herbivory and Sediment Disturbance on Plant Recruitment in a Lake Erie Coastal Wetland
ABSTRACT.-Coastal wetlands of the Laurentian Great Lakes provide many valuable ecological functions and, currently, there are extensive efforts to preserve and manage remaining habitats. We examined plant recruitment in a Lake Erie coastal marsh on bare...
Effects of Hydrology on Unionids (Unionidae) and Zebra Mussels (Dreissenidae) in a Lake Erie Coastal Wetland
ABSTRACT.-Infestation by introduced zebra mussels has extirpated native unionids in many Great Lake habitats. Shallow areas in coastal wetlands are intermittently dewatered by seiches and seasonal water level changes, and we examined how water level...
Habitat Associations and Co-Occurrence of Chihuahuan Desert Hares (Lepus Californicus and L. Callotis)
ABSTRACT.-Black-tailed and white-sided jackrabbits (Lepus californicus and L. callotis) occur sympatrically throughout much of the Chihuahuan Desert; black-tailed jackrabbits are widely distributed, whereas white-sided jackrabbits are endemic to the...
Habitat Use by Loggerhead Shrikes (Lanius Ludovicianus) at Midewin National Tallgrass Prairie, Illinois: An Application of Brooks and Temple's Habitat Suitability Index
ABSTRACT.-Declines in loggerhead shrike populations have been attributed to pesticide use and habitat loss on the breeding grounds and factors outside the breeding range. To determine the role of breeding habitat limitation, Brooks and Temple (1990)...
Japanese Barberry (Berberis Thunbergii) in Forest Understory: Leaf and Whole Plant Responses to Nitrogen Availability
ABSTRACT.-We invesligated whether Japanese barberry in forest understory responded to N availability through physiological adjustments at the leaf level or growth components at the plant level. Barberry increased foliar N, photosynthesis at ambient and...
Nest Tree Use by the Endangered Virginia Northern Flying Squirrel in the Central Appalachian Mountains
ABSTRACT.-Little is known about nest tree use of the endangered Virginia northern flying squirrel (Glaucomys sabrinus fuscus). Because nesting sites could be a limiting factor, it is important to understand the denning ecology to further manage and protect...
Plant Community Change Following Fifty-Years of Management at Kalsow Prairie Preserve, Iowa, U.S.A
ABSTRACT.-Over the last 200 y the tallgrass prairie of the Midwestern United States has experienced widespread conversion to agricultural production. Today, the few remaining tracts of unplowed grassland persist as small isolated patches within a landscape...
Riverine Peninsulas: An Experimental Approach to Homing in White-Footed Mice (Peromyscus Leucopus)
ABSTRACT.-White-footed mice, Peromyscus leucopus, were removed from a riverine peninsula to assess the effects of a river functioning as a barrier to movement. During an 8-mo period in 2001, 101 mice were live trapped and released across a river from...
Simulation Models of Harvested and Zebra Mussel Colonized Threeridge Mussel Populations in the Upper Mississippi River
ABSTRACT.-We simulated populations of threeridge mussels (Amblema plicata, Say, 1817) using empirically derived survival rates. Survival rates were derived from a mark-recapture study of mussels conducted in the Mississippi and Otter Tail rivers, Minnesota....
Small Mammal Communities of High Elevation Central Appalachian Wetlands
ABSTRACT.-We surveyed small mammal assemblages at 20 high-elevation wetlands in West Virginia and Maryland and examined relationships among mammal capture rates, richness and evenness and landscape features at multiple spatial scales. In 24,693 trap...
Survival, Growth and Gas Exchange of Celastrus Orbiculatus Seedlings in Sun and Shade
ABSTRACT.-The invasive vine Celastrus orbiculatus Thimb. (Oriental bittersweet) dominates gap and edge environments, but may also colonize undisturbed forest. We compared survival and growth of C. orbiculatus seedlings in field plots under 2%, 28% and...
The Distribution of Fox Squirrel (Sciurus Niger) Leaf Nests within Forest Fragments in Central Indiana
ABSTRACT.-We examined the abundance and placement of leaf nests by fox squirrels in six urban woodlots in central Indiana ranging in size from 1.06 to 8.28 ha. Four of the woodlots were disturbed, or subject to extensive human impact, whereas the remaining...
The Effect of Size-Limited Brood Capacity on Brood Size in a Freshwater Bivalve
ABSTRACT.-Size limited brood capacity is common among species with hard exoskeletons or shells. In these species, brood size is limited by the physical capacity to hold offspring. Here we present evidence that brood size is limited by physical constraints...
Veery Nest Sites in a Mid-Atlantic Piedmont Forest: Vegetative Physiognomy and Use of Alien Shrubs
ABSTRACT.-Veery (Catharus fuscescens) nest sites were compared to unused sites in a Middle-Atlantic Piedmont forest to determine if nest placement was random or biased with respect to forest structure and alien vegetation. Thus far, available data shows...