Digital Commons Network^™

Multiplication Of Four Penstemon Species In Vitro, Dale T. Lindgren, Brent Mccown

West Central Research and Extension Center, North Platte

Penstemon (beard tongue) is a native genus of U.S. wildflower that is used for landscape plants (Lindgren, 1984a, 1984b, 1990), for cut flowers (Lindgren, 1986), and for ecological studies (Stubbendieck et al., 1982). Tissue culture techniques could be useful for propagating cultivars and species in this genus as some do not breed true from seed, require special seed germination conditions, or are difficult to propagate using other vegetative methods (Lindgren, 1984b, 1990; Stubbendieck et al., 1982). Penstemon haydenii is also the only listed endangered plant species in Nebraska.

The Penstemon spp. P. digitalis Nutt. ‘Husker Red’ (Lindgren, 1984b); P. grandiflorus …

Reproductive Characteristics Of Rodent Assemblages In Cultivated Regions Of Central Argentina, James N. Mills, Barbara A. Ellis, Kelly T. Mckee, Julio I. Maiztegui, James E. Childs

Zoonotics and Wildlife Disease: Publications

Small mammals were trapped for 2 years at 16 localities on the central-Argentine pampa. Six species (Akodon azarae, Calomys musculinus, C. laucha, Bolomys obscurus, Oligory-zomys flavescens and Mus musculus) accounted for >95% of captures. The major breeding season, as assessed by pregnancies, was September or October through April or May. Mild weather in late autumn and winter of the second season resulted in a relatively longer breeding season during the 2nd year of the study. Females of all six species comprised significantly 50% of captures during the height of the breeding season. For most species, there was …

Relationship Of Channel Maintenance Flows To Whooping Crane Use Of The Platte River, Craig A. Faanes, David B. Bowman

Proceedings of the North American Crane Workshop

Periodic high flows in the Platte River are necessary to scour vegetation and redistribute sediment in the stream channel. Peak and mean annual flows have been reduced by as much as 70% from pre-development times, but channel maintenance flows still occur, although at a much reduced frequency and magnitude of occurrence. Use of the Platte River by migrant whooping cranes (Grus americana) in recent years appears to be related to the recent occurrence of flows in excess of 8,000 cfs for 5 or more consecutive days.

Host Quality Of Baldcypress And Its Influence On Fruittree Leafroller, Archips Argyrospila (Walker) (Lepidoptera: Tortricidae), Performance In Forested Wetlands Of Louisiana., James R. Meeker

LSU Historical Dissertations and Theses

Ecological relationships between the fruittree leafroller (FTLR), (Archips argyrospila (Walker)) and a new host, baldcypress (Taxodium distichum (L.)), were investigated in southern Louisiana where persistent annual defoliation over increasingly larger areas has occurred since 1983. Defoliation was observed to correspond with common types of baldcypress foliage morphology; designated as open and appressed. Pondcypress, Shumard oak and citrus foliage also were examined. The objectives were to: (1) determine the relative suitability/susceptibility of foliage types, and (2) quantify parameters of foliage quality possibly influencing FTLR performance. Levels of defoliation, egg mass counts, and laboratory bioassays of: initial survival, host preference, growth, feeding, …

Ecosystem Models Of Aquatic Primary Production And Fish Migration In Laguna De Terminos, Mexico., Enrique Reyes

LSU Historical Dissertations and Theses

Laguna de Terminos is Mexico's largest coastal lagoon. There is a high habitat diversity including open water, mangroves, seagrasses and marshes, which supports Mexico's most economically important fisheries. Understanding ecosystem processes is essential for effective management of the lagoon's resources. This research developed landscape-level models for aquatic primary production (LAPPTER model), and fish migration (ROE model) in Laguna de Terminos. The ROE model was developed first as a theoretical approach, and later integrated into the LAPPTER model as a submodule which utilizes simulated production as a food source. The ROE model includes behavioral rules for fish movement based on environmental …

Developing A Guidebook For An Outdoor Classroom, David D. Martell

Theses Digitization Project

Field guide -- Map -- Nature trail plant species -- Plant identification key -- Species test plot -- Climate -- Cloud identification -- Desert soils -- Tortoise station -- Animal track and pond.

Mountain Habitat Activity Guide, Gina Glock

Theses Digitization Project

No abstract provided.

Measuring Shrubland Vegetational Structure Using Avian Habitats As An Example, Douglas A. James

Journal of the Arkansas Academy of Science

Vegetational sampling of avian habitats stresses the use of methods primarily designed for forest birds. This paper describes a technique for sampling vegetational structure in uneven patchy habitats such as shrublands. Using the method, avian habitats in old field shrublands of northwestern Arkansas were analyzed.

Student Perceptions Of The Transition From Year 10 To Year 11, Tim Mcdonald

Theses : Honours

Issues associated with the transition from Year 10 to Year 11 have largely been ignored by researchers. Previous research has predominantly focussed on the primary to secondary transition experience. The existing problem of lower school to upper school transition has been compounded by the increased importance of upper school and the rising retention rates. This study investigated student perceptions of the transition from Year 10 to Year 11. It explored student concerns encountered in the transition and the differences they perceived between Year 10 and Year 11 after having entered Year 11. A case study approach, incorporating both qualitative and …

Loggerhead Shrikes Eat Crayfish, Reuven Yosef

Florida Field Naturalist

No abstract provided.

Notes On The Rock Iguana (Cyclura Carinata) Of The Caicos Islands, Robert L. Norton, Nicholas V. Clarke

Florida Field Naturalist

No abstract provided.

Status Of The Ozark Hellbender, Cryptobranchus Bishopi (Urodela: Cryptobranchidae), In The Spring River, Fulton County, Arkansas, Stanley E. Trauth, J. D. Wilhide, Patrick Daniel

Journal of the Arkansas Academy of Science

We conducted a tag and release study of the Ozark hellbender along a 26 km stretch of the Spring River from mid-July through mid-November, 1991, to determine current population levels. Salamanders were collected by hand with the aid of scuba diving equipment. Thirteen visits(36 dive hrs.) to10 selected access sites yielded 20 animals. Compared to previously published data of the early 1980's which indicated large, striving populations of C. bishopi(in some cases, > 300 individuals) in the Spring River, our study found perilously low numbers of salamanders. This drastic decline may be attributed to over collection of specimens for scientific or …

Eleven New Species Of Free-Living Marine Nematodes, Edwin J. Keppner

Gulf and Caribbean Research

The genus Halalaimus is reviewed and divided into four groups based on characters of the male. Characters used to separate the groups of males include presence or absence of caudal algae and the presence or absence of a precloacal sensillum and/or pore. Ten new species are described from St. Andrew Bay, Bay County, Florida, and H. gerlachi n. sp. is proposed for H. gracilis sensu GerIach, 1967. New species from St. Andrew Bay are H. thalassinus, H. tarjani, H. bayensis, H. bulbocaudatus, H. variabilis, H. paracomatus, H. americanus, H. floridanus, H. brimi, …

The World Bank And The Environment: A Legal Perspective, Ibrahim F.I. Shihata

Maryland Journal of International Law

No abstract provided.

Demography Of Sapphire Rockcress (Arabis Fecunda Rollins : Brassicaceae) A Rare Endemic Montana Species, Roberta Walsh

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Arbor Day Curriculum Unit For Grades Kindergarten Through Grade Six, Kathleen Ann Story

Theses Digitization Project

No abstract provided.

Movements Of A Female Black Bear In Northwestern Florida, John B. Wooding, Stephen M. Shea, Morgan L. Richardson, D. Y. Dowling

Florida Field Naturalist

No abstract provided.

Strike-Induced Chemosensory Searching: Variation Among Lizards, Royce E. Ballinger, Nathaniel R. Coady, Joseph M. Prokop, Julio A. Lemos-Espinal

Transactions of the Nebraska Academy of Sciences and Affiliated Societies

Strike-induced chemosensory searching (SICS) was found in two families of lizards (Teiidae, Anguidae) but not in two other lizard families (Scincidae, Iguanidae). Experiments on another family (Xenosauridae) were inconclusive as to its possession of SICS. The rate of tongue-flicking was significantly increased after a simulated prey strike compared to controls in Cnemidophorus sexlineatus and Barisia imbricata. SICS may be part of a complex foraging strategy evolved in certain reptiles rather than part of a generalized chemosensory behavior because two species of skinks did not exhibit SICS in spite of a well developed vomeronasal olfactory apparatus and known abilities to …

The First Documentation Of A Lower Middle Pennsylvanian Upland Flora From The Eastern Margin Of The Eastern Interior Basin (Illinois Basin), Vicki J. Comer

Masters Theses

The primary objective of this study is to reconstruct the paleofloristics of an unnamed shale of lower Middle Pennsylvanian age. The shale is periodically exposed in the highwall of the Ashboro Pit, Log Cabin Coal Company, Clay County, Indiana. This will be the first upland fossil flora to be described from the eastern margin of the Eastern Interior Basin (Illinois Basin). The gray shale containing the upland flora lies directly above the Upper Block Coal (SW 1/4, SE 1/4, sec. 17, T. 11N., R. 6W.)

Two collections, collected on three different occasions were made available for analysis: Smithsonian Natural …

Floristic Survey Of Remnant Vegetation In The Bindoon To Moora Area, Western Australia, Edward Arnold Griffin

Resource management technical reports

No abstract provided.

Pqf News: Newsletter Of The Partridge, Quail And Francolin Specialist Group 1-3, 5-6 (1992-1995), Iucn Species Survival Commission, Birdlife International, World Pheasant Association

Galliformes Specialist Group and Affiliated Societies: Newsletters

The purpose of the newsletter is to receive details of new projects, re-assessments of the status of relevant species, interesting discoveries or observations, taxonomic changes, conservation successes or threats and anything else that members might find interesting. We would like in future issues to produce a list of relevant publications which appear during the year in order to keep members up-to-date with current information. We will publish requests for contacts or information, advertisements for conferences and workshops and news of projects and project proposals.

Issue 1 (February 1992)

Foreword by Simon D. Dowell

News from around the regions: Commonwealth of …

Sussex School Backyard Nature Area Project, Yukiko Maeda Tanaka

Graduate Student Theses, Dissertations, & Professional Papers

No abstract provided.

Imminent Threat To America's Last Great Wildnerness, Anthony R. Chase

Denver Law Review

No abstract provided.