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Articles 3751 - 3780 of 3961
Full-Text Articles in Ecology and Evolutionary Biology
Atlas Of Wetlands In The Principal Coal Surface Mining Region Of Western Kentucky, William J. Mitsch, Jan R. Taylor, Kimberly B. Benson, Paul L. Hill Jr.
Atlas Of Wetlands In The Principal Coal Surface Mining Region Of Western Kentucky, William J. Mitsch, Jan R. Taylor, Kimberly B. Benson, Paul L. Hill Jr.
KWRRI Research Reports
This atlas contains maps of wetlands and surface mining activity in the Western Kentucky Coal Field, and focuses on a 3960 km2 (1530 mi2) region where approximately 90 percent of surface mining in the Coal field occures. Some present and potential competition exists between surface coal mining and wetland protection. A wetland classification, based on the recent FWS classification, includes six types of palustrine systems and one each of riverine and laucstrine systems. Wetlands and surface mines are located on twenty-seven 7.5 minute USGS quadrangles that define the study region. A total of 460 km2 (177 …
The Prairie Naturalist Volume 15, No. 2. June 1983
The Prairie Naturalist Volume 15, No. 2. June 1983
The Prairie Naturalist
Paul B. Kannowski, Editor
Douglas H. Johnson, Book Review Editor
TABLE OF CONTENTS
EFFECTS OF FIRE ON RODENTS IN TALLGRASS PRAIRIE OF THE FLINT HILLS REGION OF EASTERN KANSAS. D. W. Kaufman, G. A. Kaufman, and E. J. Finck
FECAL pH AND FOOD HABITS OF SYMPATRIC LAGOMORPHS IN TEXAS R. J. Warren
UNUSUAL PLANT ASSEMBLAGE IN WALSH COUNTY, NORTH DAKOTA ▪ B. Heidel
ADDITIONAL RECORDS OF PASSERINES FEEDING ON POPLAR GALLS, AND A POSSIBLE MECHANISM FOR SUMMER NOMADISM IN BOREAL FINCHES ▪ P. J. DuBowy
UPDATE ON THE AMERICAN BALD EAGLE, Haliaeetus leucocephalus L., IN NEBRASKA ▪ S. J. Rothenberger …
Cameron B. Kepler's Review Of Janet Kear And A. J. Berger's The Hawaiian Goose: An Experiment In Conservation, Cameron B. Kepler
Cameron B. Kepler's Review Of Janet Kear And A. J. Berger's The Hawaiian Goose: An Experiment In Conservation, Cameron B. Kepler
Pacific Studies
No abstract provided.
The Prairie Naturalist Volume 15, No. 1. March 1983
The Prairie Naturalist Volume 15, No. 1. March 1983
The Prairie Naturalist
NUTRIENT POOL SIZE RELATIONS IN THE UNDERSTORY STRATA OF A NORTHERN GREAT PLAINS GALLERY FOREST ▪ K. T. Killingbeck
COMPARISON OF OLD FIELD SUCCESSION ON A TALLGRASS PRAIRIE AND A NEBRASKA SANDHILLS PRAIRIE ▪ M. L. Bomberger, S. L. Shields, A. T. Harrison and K. H. Keeler
MANIPULATION OF FLOOD MEADOW VEGETATION AND OBSERVATIONS ON SMALL MAMMAL POPULATIONS ▪ J. E. Cornely, C. M. Britton and F. A. Sneva
CANVASBACK INTRODUCTION IN WEST-CENTRAL MINNESOTA ▪ H. A. Doty
FORAGING BEHAVIOR AND WATER USE OF HORSES AND CATTLE IN THE WYOMING RED DESERT ▪ L. J. Krysl, G. E. Plumb, M. …
Water Quality Trends In The Las Vegas Wash Wetlands, F. A. Morris, L. J. Paulson
Water Quality Trends In The Las Vegas Wash Wetlands, F. A. Morris, L. J. Paulson
Publications (WR)
The Las Vegas Wash is a wetlands ecosystem that acts to buffer the effects of wastewater discharges on the receiving waters of Lake Mead. The wash is the terminus for the 4,144 km2 Las Vegas Valley drainage basin, emptying into Las Vegas Bay of Lake Mead (Colorado River). It is in the northern Mojave desert, which receives an average of only 10 cm of rainfall annually. The Las Vegas Wash is technically an artificial wetland supported almost entirely by the perennial flows from sewage treatment plants. These flows contribute an average of 3-7 t of nutrients (nitrogen and phosphorus) and …
Use Of Hydroelectric Dams To Control Evaporation And Salinity In The Colorado River System, Larry J. Paulson
Use Of Hydroelectric Dams To Control Evaporation And Salinity In The Colorado River System, Larry J. Paulson
Publications (WR)
The main stem reservoirs on the Colorado River comprise one of the largest and most heavily used freshwater bodies in the nation. These reservoirs (Lake Powell, Lake Mead, Lake Mohave and Lake Havasu) can store up to 53,590,400 acre-feet of water at their maximum capacities. Nonetheless, local water shortages still exist in some areas of the Colorado River Basin. There is also concern that salt concentrations are approaching levels that could severely affect municipal and agricultural uses. Water shortages will become even more acute as demands for water increase with continued urban and agricultural development in the basin. Water conservation …
The Influence Of Lake Powell On The Suspended Sediment-Phosphorus Dynamics Of The Colorado River Inflow To Lake Mead, T. D. Evans, Larry J. Paulson
The Influence Of Lake Powell On The Suspended Sediment-Phosphorus Dynamics Of The Colorado River Inflow To Lake Mead, T. D. Evans, Larry J. Paulson
Publications (WR)
The Colorado River has been successively modified by the construction of several reservoirs, beginning in 1935 with the formation of Lake Mead by Hoover Dam. These reservoirs are located in a chain, and each one has an influence on the nutrient dynamics and productivity of the river and downstream reservoir. Lake Mead derives 98% of its annual inflow from the Colorado River. Historically, the Colorado River inflow was unregulated into Lake Mead. Regulation occurred in 1963, when Lake Powell was impounded by the construction of Glen Canyon Dam, approximately 450 km upstream. The formation of Lake Powell drastically altered the …
Effects Of Sewage Pollution In The White River, Arkansas, Arthur V. Brown, Lawrence D. Willis, Peter P. Brussock
Effects Of Sewage Pollution In The White River, Arkansas, Arthur V. Brown, Lawrence D. Willis, Peter P. Brussock
Journal of the Arkansas Academy of Science
Recently there has been much emphasis placed on the importance of leaf detritus processing to the energetics of stream invertebrates. This study was designed primarily to assess the effects of municipal effluent on the ability of a stream community to utilize leaf detritus, and secondarily to evaluate the extent of the pollution of the White River by the Fayetteville, Arkansas, effluent discharge. Physical and chemical water quality and benthos were sampled periodically at one station upstream and two stations downstream from the discharge, and in the Richland Creek tributary. Processing of leaf detritus was also studied at each site using …
The Prairie Naturalist Volume 14, No. 4. December 1982
The Prairie Naturalist Volume 14, No. 4. December 1982
The Prairie Naturalist
THE MICROBIAL AND VEGETATIONAL RESPONSE TO FIRE IN THE LYNX PRAIRIE PRESERVE, ADAMS COUNTY, OHIO ▪ A. E. Annala and L. A. Kapustka
ASPECTS OF BEHAVIOR IN FREE-RANGING BARBARY SHEEP (AMMOTRAGUS LERVIA) G. G. Gray and C. D. Simpson
HOME RANGES OF MULE DEER BUCKS IN THE TEXAS PANHANDLE ▪ B. H. Koerth and F. C. Bryant
DETERMINING SEX OF PLAINS POCKET GOPHERS BY INCISOR WIDTH ▪ R. M. Case and A. B. Sargeant
BOOK REVIEWS:
On Counting Birds ▪ S. A. Mikol
Freshwater Marshes ▪ R. M. Kaminiski
NOTICE TO AUTHORS ▪ Editor
INDEX TO VOLUME 14 …
The Prairie Naturalist Volume 14, No. 3. September 1982
The Prairie Naturalist Volume 14, No. 3. September 1982
The Prairie Naturalist
FECAL pH OF DESERT AND EASTERN COTTONTAIL RABBITS IN TEXAS ▪ R. J. Warren and K. T. Scribner
NESTING OF THE AMERICAN AVOCET IN NORTH DAKOTA ▪ J. G. Sidle and P. M. Arnold
REVISED CHECKLIST OF NORTH DAKOTA BIRDS ▪ C. A. Fannes and R. E. Stewart
THE EFFECT OF WEATHER FACTORS ON AUDUBON CHRISTMAS BIRD COUNTS L. L. Falk
NOTES:
Additional Nest Record for Red-breasted Nuthatch in North Dakota ▪ R. Hopkins
A Henslow's Sparrow in North Dakota ▪ R. B. Renken and J. J. Dinsmore
First Documented Record of the Moose in South Dakota ▪ D. A. …
An Ecological Analysis Of Relic Diatoms In Sediments Of Las Vegas Bay, Lake Mead, David Ross Hetzel
An Ecological Analysis Of Relic Diatoms In Sediments Of Las Vegas Bay, Lake Mead, David Ross Hetzel
Publications (WR)
Relic diatoms in sediments of the inner Las Vegas Bay, near the Las Vegas Wash sewage inflow, were examined in order to assess historic trophic conditions in this area of Lake Mead. Diatom sedimentation rates and ratios of Araphidineae/Centrales (A/C) diatom groups were determined from sediment cores collected in the old wash channel 1.5 km from the sewage inflow (station 2), in a small cove 1.5 km further downstream (station 3) and in an adjacent embayment off Gypsum Wash (station 4). Diatom sedimentation rates generally increased from the bottom to the top of each core, but pronounced minima existed at …
The Effects Of Kepone On The Estuarine Copepod Acartia Tonsa, Judith Marie Wilson
The Effects Of Kepone On The Estuarine Copepod Acartia Tonsa, Judith Marie Wilson
Biological Sciences Theses & Dissertations
Due to the contamination of a 113 km reach of the James River, Kepone poses a serious environmental threat to the Chesapeake Bay. The purpose of the study is to determine the acutely toxic and sublethal levels of kepone for the copepod Acartia tonsa, and to investigate what effects those levels may have on filtration rates.
Kepone was determined to be acutely toxic to A. tonsa, with a 96 hour LC50 of 4.96 ug/1. Dunaliella tertiolecta was selected as the food source for the grazing experiments. Kepone concentrations of 0.046 ug/1 significantly (0.05 level) reduced the flltering rate …
The Prairie Naturalist Volume 14, No. 2. June 1982
The Prairie Naturalist Volume 14, No. 2. June 1982
The Prairie Naturalist
DISTRIBUTIONS, DENSITIES, AND RELATIVE ABUNDANCES OF GRASSHOPPERS (ORTHOPTERA: ACRIDIDAE) IN A NEBRASKA SAND HILLS PRAIRIE ▪ A. Joern
FLORA OF FOREST CLEARINGS CREATED BY LOGGING IN BELTRAMI COUNTY, MINNESOTA ▪ E. W. Devlin
CHRISTMAS BIRD COUNTS FOR NORTH DAKOTA - 1981 ▪ R. N. Randall
RAPTOR USE OF HARDWOOD DRAWS IN CENTRAL NORTH DAKOTA ▪ R. C. Gaines and S. C. Kohn
NOTES ON DUCK NEST STRUCTURES ▪ J. G. Sidle and P. M. Arnold
EFFECT OF SOIL MOISTURE OR SOIL TEMPERATURE ON REPRODUCTION OF INDIGENOUS NEMATODE POPULATIONS IN A MIXED PRAIRIE ▪ J. D. Smolik
CORRECTION: Replacement for Table …
Influence Of Photosynthetic Photon Flux Density On Uv-Binduced Photoinhibition In Soybean Leaves: Comparison Of Preconditioning And Concomitant Light Treatments, Charles W. Warner
Influence Of Photosynthetic Photon Flux Density On Uv-Binduced Photoinhibition In Soybean Leaves: Comparison Of Preconditioning And Concomitant Light Treatments, Charles W. Warner
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Previous studies indicate that the degree of UV-Binduced photosynthetic inhibition may be highly dependent upon the photosynthetic photon flux density (PPFD, total quantum flux in the waveband 400-700 nm) incident on a plant. This study illustrates that Essex soybean leaves (Glycine max) preconditioned under high PPFD suffered less UV-B-induced photoinhibition than when preconditioned under low PPFD. However, sensitivity to UV-B increased when soybean leaves received high-PPFD as a concomitant treatment.
The relative msgnitude of UV-B-induced damage was similar for both light-limited and light-saturated photosynthesis. This probably indicates that UV-B is inhibiting fundamentally different photosynthetic processes.
Soybean leaves preconditioned …
The Prairie Naturalist Volume 14, No. 1. March 1982
The Prairie Naturalist Volume 14, No. 1. March 1982
The Prairie Naturalist
LEGUME DISTRIBUTION AND NODULATION IN ARAPAHO PRAIRIE, ARTHUR COUNTY, NEBRASKA ▪ L. A. Kapustka and J. D. DuBois
BREEDING BIRDS IN TWO DRY WETLANDS IN EASTERN SOUTH DAKOTA ▪ D. E. Hubbard
RELATIVE EFFICIENCY OF THREE SMALL-MAMMAL TRAPS IN PRAIRIE WETLANDS G. W. Pendleton and R. P. Davison
WHITE PELICAN POPULATIONS AT CHASE LAKE, NORTH DAKOTA, EVALUATED BY AERIAL PHOTOGRAPHY ▪ J. G. Sidle and E. L. Ferguson
MOSQUITOES (DIPTERA:CULICIDAE) CONSUMED BY BREEDING ANATINAE IN SOUTH CENTRAL NORTH DAKOTA ▪ M. I. Meyer and G. W. Swanson
BOOK REVIEWS:
Peterson's revised field guide ▪ J. M. Andrew
Midwestern turtles ▪ …
The Voluntary Water Quality Monitoring Program : 1982 Project Report, Barbara Welch, Judy Potvin, Mary Ellen Dennis
The Voluntary Water Quality Monitoring Program : 1982 Project Report, Barbara Welch, Judy Potvin, Mary Ellen Dennis
Maine Collection
The Voluntary Water Quality Monitoring Program : 1982 Project Report
by Barbara Welch, Judy Potvin & Mary Ellen Dennis
Division of Environmental Evaluation and Lake Studies, Maine Department of Environmental Protection, Augusta, Maine 1982.
Contents: Understanding Maine's Lakes and Ponds / Acknowledgement / Temperature / Dissolved Oxygen / Other Measures of Lake Water Quality / Nutrients / Algae and Chlorophyll a / Transparency / Morphometry / Sampling / Protection / Classification / Answers to Most Frequently Asked Questions / Glossary of Terms / Appendix A : Maximum, Minimum, and Mean Values / Appendix B : Phosphate Content of Common Cleansers …
The Systematics And Biology Of The Genus Zapus (Mammalia, Rodentia, Zapodidae), Gwilym S. Jones
The Systematics And Biology Of The Genus Zapus (Mammalia, Rodentia, Zapodidae), Gwilym S. Jones
All-Inclusive List of Electronic Theses and Dissertations
This study was undertaken to determine specific and intraspecific relationships within the genus Zapus (Mammalia, Rodentia, Zapodidae). Subspecies are based on the biological subspecies concept where the subspecies is an evolutionary step between a population and species. Approximately 20,000 Recent specimens and representatives of fossil taxa were examined. Cranial and postcranial characteristics, colors, and when available bacula, sperms and karyotypes were incorporated into the morphological analyses. In addition, published biological data were summarized and analyzed for evidence of primary and secondary isolating mechanisms. Supplemental data were acquired during collection of 450 specimens in midwestern and western United States, western Canada, …
The Ecology Of Maine's Intertidal Habitats : A Report Prepared For The Maine State Planning Office, Peter F. Larsen, Lee F. Doggett
The Ecology Of Maine's Intertidal Habitats : A Report Prepared For The Maine State Planning Office, Peter F. Larsen, Lee F. Doggett
Maine Collection
The Ecology of Maine's Intertidal Habitats : A Report Prepared for the Maine State Planning Office
by Bigelow Laboratory for Ocean Sciences (Authors: Peter F. Larsen and Lee F. Doggett) , 1981.
Contents: Acknowledgements / List of Tables / List of Figures / Chapter 1 - Introduction / Chapter 2 - Human Impact on Intertidal Fauna / Chapter 3 - A Primer of Intertidal Ecology / Chapter 4 - A Sampler of Intertidal Species / Chapter 5 - Methodology / Chapter 6 - Results of Faunal Studies / Appendix 1 - Habitats With Date Sampled / Appendix 2 - List …
The Prairie Naturalist Volume 13, Numbers 3 And 4. September - December 1981
The Prairie Naturalist Volume 13, Numbers 3 And 4. September - December 1981
The Prairie Naturalist
PROVISIONAL CHECKLIST OF MAMMALS OF SOUTH DAKOTA ▪ J. R. Choate and J. K. Jones, Jr.
LABORATORY FEEDING PREFERENCES OF THREE SMALL MAMMALS FOR FIVE TREE SPECIES ▪ T. G. Barnes and T. A. Schaid
NESTLING DIETS OF RED-WINGED AND YELLOW-HEADED BLACKBIRDS ON PLAYA LAKES OF WEST TEXAS ▪ D. H. Fischer and E. C. Bolen
COMPARISON OF FOUR NORTH DAKOTA IMPOUNDMENTS AND FACTORS AFFECTING
THE DEVELOPMENT OF IMPOUNDMENT PARASITOFAUNA ▪ H. L. Holloway, Jr. and N. T. Hagstrom
FIRST STATE RECORD OF RICHARDSON'S GROUND SQUIRREL IN IOWA ▪ R. P. Lampe, J. B. Bowles, and R. Spengler
THE EFFECT …
Algal Dynamics In A Cypress Stand In The Seasonally Flooded Great Dismal Swamp, Joseph A. Atchue Iii
Algal Dynamics In A Cypress Stand In The Seasonally Flooded Great Dismal Swamp, Joseph A. Atchue Iii
Biological Sciences Theses & Dissertations
The dynamics of epiphytic algae and phytoplankton were studied at a cypress stand in the Great Dismal Swamp, Virginia. Mean epiphytic algal biomass was 19.9 g m-2 and mean planktonic biomass was 3.4 g m-2.Nutrient concentrations in the epiphytic algae and the litter were determined. The algae had mean concentrations of 1.67% and 0.18%. They were found to immobilize as much as 0.5 g N m-2 and 0.06 g P m-2. This suggests that the algae are important as nutrient conservers. The phytoplankton were composed primarily of Bacillariophyceae. They exhibited a more or less …
Diagenesis Of Organic Matter In Las Vegas Bay And Bonelli Bay, Lake Mead, James W. Murray, Carolyn J. Jones, Kathy Kuivila, Jeff Sawlan
Diagenesis Of Organic Matter In Las Vegas Bay And Bonelli Bay, Lake Mead, James W. Murray, Carolyn J. Jones, Kathy Kuivila, Jeff Sawlan
Publications (WR)
The interstitial water chemistry of the sediments of Las Vegas Bay and Bonelli Bay in Lake Mead has been studied as part of a comprehensive water quality study of those locations. Pore water and solid phase analyses were completed from four stations in Las Vegas Bay and two stations in Bonelli Bay. At both locations the pore water compositions and organic matter diagenesis in the sediments are dominated by sulfate reduction. This major role of sulfate reduction is unusual for lake sediments and reflects the fact that SO4 is the major anion in the lake water. In addition, gypsum …
The Prairie Naturalist Volume 13, Number 2. June 1981
The Prairie Naturalist Volume 13, Number 2. June 1981
The Prairie Naturalist
HERPETOFAUNA OF MORMON ISLAND PRESERVE, HALL COUNTY, NEBRASKA ▪ S. M. Jones, R. E. Ballinger and J. W Nietfeldt
COYOTE USE OF PLAYAS IN THE TEXAS HIGH PLAINS ▪ R. W. Whiteside and F. S. Guthery
NEW RECORD OF THE LEAST WEASEL IN WYOMING ▪ M. R. Stromberg, D. E. Biggens and M. Bidwell
STATUS OF AMERICAN WOODCOCK IN NEBRASKA WITH NOTES ON A RECENT BREEDING RECORD ▪ G. R. Lingle
WINTER FOODS OF THE PINE GROSBEAK IN EASTERN NORTH DAKOTA ▪ R. C. Reigh
SEASONAL VARIATION IN HOME RANGE OF A FEMALE BADGER (Taxidea taxus) ▪ R. …
Effect Of Mild Water Stress And Enhanced Ultraviolet-B Irradiation On Leaf Growth Of Rumex Obtusifolius L. And Rumex Patientia L. (Polygonaceae)., Steve R. Holman
Effect Of Mild Water Stress And Enhanced Ultraviolet-B Irradiation On Leaf Growth Of Rumex Obtusifolius L. And Rumex Patientia L. (Polygonaceae)., Steve R. Holman
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Leaves of Rumex obtusifolius L. and R. patientia L.were exposed to combinations of mild water stress and enhanced ultraviolet-B irradiation during their ontogeny. Two UV-B treatments (enhanced UV-B and control) and three water stress treatments (-0.0 MPa, -0.2 MPa and -0.4 MPa rooting medium matric potentials) were employed. The impact of the stress interaction was assessed on the basis of changes in leaf area, average adaxial epidermal cell size, and total number of adaxial epidermal cells per leaf. Although the level of UV-B irradiation applied was insufficient to significantly alter leaf growth at any given water stress, UV-B did interact …
The Energy Expenditure Of Heifers Grazing Crested Wheatgrass Rangeland In West-Central Utah, Kris M. Havstad
The Energy Expenditure Of Heifers Grazing Crested Wheatgrass Rangeland In West-Central Utah, Kris M. Havstad
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The free-roaming ruminant requires energy for the demands of vii grazing, traveling and thermoregulation that are not required by its confined counterpart. Literature estimates of these additional costs range from 10 to 170 percent above maintenance. The uncertain magnitude of this increased demand and the factors that contribute to it impede the ability of the rangeland ruminant nutritionist to establish guidelines for the energy requirements of the free-roaming herbivore. This study was designed to estimate the energy expenditure of yearling Angus heifers while grazing a declining supply of available crested wheatgrass forage (Agropyron cristatum) on rangeland in west-central …
Fall Regrowth Of Crested Wheatgrass And Fourwing Saltbush, Noor Mohammad
Fall Regrowth Of Crested Wheatgrass And Fourwing Saltbush, Noor Mohammad
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
During 1980-81, studies with crested wheatgrass (Agropyron desertorum) and fourwing saltbush (Atriplex canescens) were conducted in controlled environment growth chambers as well as under field conditions to achieve the following objectives:
1. To determine the effect of nitrogen fertilizer on the water use efficiency.
2. To determine the effects of various temperature, water stress and nitrogen treatments on the productivity, nitrogen content and carbohydrate reserves.
3. To determine the effects of N fertilization on fall and spring regrowth.
Crested wheatgrass and fourwing saltbush plants were maintained in three growth chambers for 60 days under three temperature …
Seasonal Temperature Preference Of Adult Mountain Whitefish, Prosopium Williamsoni, Jean M. Ihnat
Seasonal Temperature Preference Of Adult Mountain Whitefish, Prosopium Williamsoni, Jean M. Ihnat
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Temperatures selected seasonally by adult mountain whitefish were measured in the laboratory in a horizontal gradient. Final preferendum estimates, based on acute (3-hour) preference tests conducted with fish acclimated to 5, 10, and 15 C each season, were 17.7 C (pre-spawning), 11.9 C (post-spawning), 9.9 C (winter), and 16.3 C (spring). Seasonal influence on temperature selection was evident on the basis of differences in final preferenda, covariance analysis of responses of laboratory-acclimated fish, and temperature selection by fish held at ambient river temperatures. Post-spawning and winter groups selected lower temperatures than did pre-spawning and spring groups. Pre-spawning fish selected temperatures …
Some Morphological And Chemical Responses Of Blackbrush (Coleogyne Ramosissima) To Goat Browsing: Influences On Dietary Blackbrush Selection By Goats And Cattle, Frederick D. Provenza
Some Morphological And Chemical Responses Of Blackbrush (Coleogyne Ramosissima) To Goat Browsing: Influences On Dietary Blackbrush Selection By Goats And Cattle, Frederick D. Provenza
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Domestic goats were used to modify the growth form of blackbrush, a spinescent shrub occurring in nearly monospecific stands on several million hectares of rangeland in the southwestern United States. The objective of this research was to evaluate goat browsing as a means of improving these rangelands for cattle. Winter goat browsing stimulated spring twig growth from basal and axillary buds which resulted in increased production.
Twig production by heavily browsed plants (>95 percent removal of current season's twigs) was a function of precipitation, soil depth, branch location on the plant, and period of rest after browsing. As precipitation …
Higher Plant Acclimation To Solar Ultraviolet-B Radiation, Ronald Robberecht
Higher Plant Acclimation To Solar Ultraviolet-B Radiation, Ronald Robberecht
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Plant acclimation to natural and intensified solar UV-B irradiance was investigated in three species, Oenothera stricta Ledeb., Rumex obtusifolius L., and R. patientia L. The objectives of this study were to determine: (1) the relationship between plant sensitivity and epidermal UV attenuation, (2) the effect of phenotypic changes in the leaf epidermis, resulting from UV-B exposure, on plant sensitivity to UV radiation, and (3) the plasticity of these changes in the epidermis leading to plant acclimation to UVB radiation.
Epidermal UV transmittance was found to differ in magnitude and spectral distribution among the three species examined in this study. Epidermal …
Maine's Whitewater Rapids And Their Relevance To The Critical Areas Program, Janet Mcmahon
Maine's Whitewater Rapids And Their Relevance To The Critical Areas Program, Janet Mcmahon
Maine Collection
Maine's Whitewater Rapids and Their Relevance to the Critical Areas Program
by Janet McMahon
Planning Report No. 74, Critical Areas Program, 184 State St., Augusta, Maine,
April, 1981 (additions made in October, 1981). Reprinted July, 1983.
Contents: Introduction / Natural History of Whitewater Rapids / Methods / Criteria / Results / Conclusions / General Evaluation of Whitewater Rapids for Inclusion on the Register of Critical Areas / Bibliography / Action Plan
The Prairie Naturalist Volume 13, Number 1. March 1981
The Prairie Naturalist Volume 13, Number 1. March 1981
The Prairie Naturalist
EDITOR: Dr. Paul B. Kannowski
BOOK REVIEW EDITOR: Douglas H. Johnson
TABLE OF CONTENTS
WATERFOWL USE OF A MUNICIPAL SEWAGE LAGOON ▪ G-A. D. Maxson
MASS MORTALITY OF MUSSELS FROM SLUMPING ALONG THE RED LAKE RIVER NEAR CROOKSTON, MINNESOTA ▪ A. M. Cvancara, D. J. Brown, D. K. Cudworth, and T. R. Klett
CHRISTMAS BIRD COUNTS FOR NORTH DAKOTA — 1980 ▪ R. N. Randall
BREEDING BIRDS ON WATERFOWL PRODUCTION AREAS IN NORTHEASTERN NORTH DAKOTA ▪ H. F. Duebbert
FURTHER EVIDENCE OF MARSH HAWKS FEEDING ON DUCKS ▪ R. A. Wishert, R. M. Kaminski, and D. W. Soprovich
FIRST NEST …