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Articles 2611 - 2640 of 2761

Full-Text Articles in Other Environmental Sciences

Ectoparasitism As A Cause Of Natal Dispersal In Cliff Swallows, Charles R. Brown, Mary Bomberger Brown Jan 1992

Ectoparasitism As A Cause Of Natal Dispersal In Cliff Swallows, Charles R. Brown, Mary Bomberger Brown

School of Natural Resources: Faculty Publications

Nestling Cliff Swallows (Hirundo pyrrhonota) in southwestern Nebraska that were relatively heavily parasitized by hematophagous fleas (Ceratophyllus celsus) and swallow bugs (Oeciacus vicarius) dispersed to nonnatal colonies to breed the subsequent year, whereas nestlings that were relatively lightly parasitized returned to their natal colony to breed. There were no significant differences between dispersers and nondispersers in natal clutch size, natal brood size, relative hatching date, natal body mass, natal nest's distance from the colony's center, and natal nest's age. There were no sex differences in dispersal tendencies. Dispersing birds tended to move to smaller colonies …


Ecological Aspects Of Burrowing Owl Nesting Strategies In The Nebraska Panhandle, Martha J. Desmond Dec 1991

Ecological Aspects Of Burrowing Owl Nesting Strategies In The Nebraska Panhandle, Martha J. Desmond

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.


Bird Response To Monofilament Lines At Backyard Feeders, Kimberly K. Kessler Dec 1991

Bird Response To Monofilament Lines At Backyard Feeders, Kimberly K. Kessler

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.


Biology And Ecology Of Dioryctria Ponderosae Dyar And Dioryctria Tumicolella Mutuura, Munroe And Ross, Mark A. Brohman Dec 1991

Biology And Ecology Of Dioryctria Ponderosae Dyar And Dioryctria Tumicolella Mutuura, Munroe And Ross, Mark A. Brohman

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.


Biology And Ecology Of Dioryctria Ponderosae Dyar And Dioryctria Tumicolella Mutuura, Munroe And Ross, Mark A. Brohman Dec 1991

Biology And Ecology Of Dioryctria Ponderosae Dyar And Dioryctria Tumicolella Mutuura, Munroe And Ross, Mark A. Brohman

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.


Effects Of The Conservation Reserve Program On Selected Wildlife Populations In Southeast Nebraska, Justin W. King May 1991

Effects Of The Conservation Reserve Program On Selected Wildlife Populations In Southeast Nebraska, Justin W. King

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.


Wbecon: A Windbreak Evaluation Model 1, James R. Brandle Jan 1991

Wbecon: A Windbreak Evaluation Model 1, James R. Brandle

School of Natural Resources: Faculty Publications

No abstract provided.


Estimation Of Shortwave Hemispherical Reflectance (Albedo) From Bidirectionally Reflected Radiance Data, Elizabeth A. Walter-Shea, Blaine L. Blad Jan 1991

Estimation Of Shortwave Hemispherical Reflectance (Albedo) From Bidirectionally Reflected Radiance Data, Elizabeth A. Walter-Shea, Blaine L. Blad

School of Natural Resources: Faculty Publications

No abstract provided.


Leaf Reflectance And Transmittance In Soybean And Corn, Elizabeth A. Walter-Shea, Blaine Blad Jan 1991

Leaf Reflectance And Transmittance In Soybean And Corn, Elizabeth A. Walter-Shea, Blaine Blad

School of Natural Resources: Faculty Publications

No abstract provided.


Predicting Canopy Light-Use Efficiency From Leaf Characteristics, T. J. Arkebauer Jan 1991

Predicting Canopy Light-Use Efficiency From Leaf Characteristics, T. J. Arkebauer

School of Natural Resources: Faculty Publications

No abstract provided.


Modeling Canopy Stomatal Conductance In A Temperate Grassland Ecosystem, Joon Kim, Shashi B. Verma Jan 1991

Modeling Canopy Stomatal Conductance In A Temperate Grassland Ecosystem, Joon Kim, Shashi B. Verma

School of Natural Resources: Faculty Publications

No abstract provided.


Modeling Canopy Photosynthesis: Scaling Up From A Leaf To Canopy In A Temperate Grassland Ecosystem, S. B. Verma Jan 1991

Modeling Canopy Photosynthesis: Scaling Up From A Leaf To Canopy In A Temperate Grassland Ecosystem, S. B. Verma

School of Natural Resources: Faculty Publications

No abstract provided.


Photoperiod Control Of Poplar Bark Storage Protein Accumulation, Gary D. Coleman, Tony H.H. Chen, Stephen G. Ernst, Leslie Fuchigami Jan 1991

Photoperiod Control Of Poplar Bark Storage Protein Accumulation, Gary D. Coleman, Tony H.H. Chen, Stephen G. Ernst, Leslie Fuchigami

School of Natural Resources: Faculty Publications

Bark storage proteins (BSPs) accumulate in the inner bark parenchyma of many woody plants during autumn and winter. We investigated the effect of a short-day (SD) photoperiod on the accumulation of the 32-kilodalton bark storage protein of poplar (Populus deltoides Bart. ex Marsh.) under controlled environmental and natural growing conditions. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and protein gel blot analysis revealed that 10 days of SD exposure (8 hours of light) resulted in a 20% increase in the relative abundance of the 32-kilodalton bark storage protein of poplar. After 17 days of SD exposure, the 32-kilodalton bark storage protein …


Slope Effects On Shortwave Radiation Components And Net Radiation: Interim Report For Period April 1, 1991- December 31, 1991, E. A. Walter-Shea, B. L. Blad, C. J. Hays, M. A. Mesarch Jan 1991

Slope Effects On Shortwave Radiation Components And Net Radiation: Interim Report For Period April 1, 1991- December 31, 1991, E. A. Walter-Shea, B. L. Blad, C. J. Hays, M. A. Mesarch

School of Natural Resources: Documents and Reviews

No abstract provided.


Potential Effects Of Climate Change On Milk Production And Conception Rate In Dairy Cattle In The United States And Western Europe, Peggy Lea Klinedinst Jan 1991

Potential Effects Of Climate Change On Milk Production And Conception Rate In Dairy Cattle In The United States And Western Europe, Peggy Lea Klinedinst

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.


A Report On Black-Tailed Prairie Dogs In Nebraska, Their Biology, Behavior, Ecology, Management, And Responses To A Visual Barrier Fence, Nancy S. Foster Dec 1990

A Report On Black-Tailed Prairie Dogs In Nebraska, Their Biology, Behavior, Ecology, Management, And Responses To A Visual Barrier Fence, Nancy S. Foster

School of Natural Resources: Dissertations, Theses, and Student Research

I examined the effects of a visual barrier fence, which had a see-through visibility of 600/0, on the foraging, vigilance, and aggressive behaviors of adult female black-tailed prairie dogs from June through August 1990 in central Nebraska. I also examined changes in their home ranges and use of an area in response to this fence. Prairie dogs prefer an open view of their surroundings. Therefore, I expected animals near a visual barrier to spend more time in vigilance and aggression, and less time foraging. Adult female prairie dogs exposed to the visual barrier devoted more time to foraging and less …


The Pacific/ North American Teleconnection Pattern And United States Climate. Part I: Regional Temperature And Precipitation Associations, Daniel J. Leathers, Brent Yarnal, Michael A. Palecki Nov 1990

The Pacific/ North American Teleconnection Pattern And United States Climate. Part I: Regional Temperature And Precipitation Associations, Daniel J. Leathers, Brent Yarnal, Michael A. Palecki

School of Natural Resources: Faculty Publications

The Pacific/ North American (PNA) teleconnection index, a measure of the strength and phase of the PNA teleconnection pattern, is related to the variations of the surface climate of the United States from 1947 through 1982 for the autumn, winter, and spring months when the PNA is a main mode of Northern Hemisphere mid-tropospheric variability. The results demonstrate that the PNA index is highly correlated with both regional temperature and precipitation. The strongest, most extensive correlations between the index and temperature are observed in winter, but large areas of the country show important associations during the spring and autumn as …


Interactions Between Plains Pocket Gophers And Two Varieties Of Dryland Alfalfa, James C. Luchsinger May 1990

Interactions Between Plains Pocket Gophers And Two Varieties Of Dryland Alfalfa, James C. Luchsinger

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.


Evaluation Of Monofilament Lines To Prevent Damage By Birds, Danilo A. Aguero May 1990

Evaluation Of Monofilament Lines To Prevent Damage By Birds, Danilo A. Aguero

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.


Regional Climate Centers: New Institutions For Climate Service And Climate- Impact Research, Stanley A. Changnon, Peter J. Lamb, Kenneth G. Hubbard Apr 1990

Regional Climate Centers: New Institutions For Climate Service And Climate- Impact Research, Stanley A. Changnon, Peter J. Lamb, Kenneth G. Hubbard

School of Natural Resources: Faculty Publications

In response to the need climate services at the local, state, and regional levels, a national network of regional climate centers has developed. This provides the background to this development, and outlines the functions of the centers and identifies their benefits and beneficiaries. The centers are a source of climate expertise and maintain multifaceted interfaces with the public and private sectors. Each center a) performs services, including the management of the basic data for its region and the delivery of specialized products; b) conducts applied climate studies, including the monitoring of anomalous conditions and the promotin of regional research; and …


Potential Effects Of Climate Change On Tree Survival And Forest Pests In The Great Plains, James R. Brandle Jan 1990

Potential Effects Of Climate Change On Tree Survival And Forest Pests In The Great Plains, James R. Brandle

School of Natural Resources: Faculty Publications

No abstract provided.


Potential Effects Of Climate Change On Tree Survival And Forest Pests In The Great Plains, James R. Brandle Jan 1990

Potential Effects Of Climate Change On Tree Survival And Forest Pests In The Great Plains, James R. Brandle

School of Natural Resources: Faculty Publications

No abstract provided.


Shelterbelts: A Buffer To Climate On The Plains, James R. Brandle Jan 1990

Shelterbelts: A Buffer To Climate On The Plains, James R. Brandle

School of Natural Resources: Faculty Publications

No abstract provided.


Management Of Microclimate With Windbreaks, James R. Brandle Jan 1990

Management Of Microclimate With Windbreaks, James R. Brandle

School of Natural Resources: Faculty Publications

No abstract provided.


Components Of Surface Energy Balance In A Temperate Grassland Ecosystem, S. B. Verma Jan 1990

Components Of Surface Energy Balance In A Temperate Grassland Ecosystem, S. B. Verma

School of Natural Resources: Faculty Publications

No abstract provided.


Carbon Dioxide Exchange In A Temperate Grassland Ecosystem, S. B. Verma Jan 1990

Carbon Dioxide Exchange In A Temperate Grassland Ecosystem, S. B. Verma

School of Natural Resources: Faculty Publications

No abstract provided.


Calibration Of Field Reference Panel And Radiometers Used In Fife 1989: Semi-Annual Report For Period February 1- September 30, 1990, B. L. Blad, E. A. Walter-Shea, C. J. Hays, M. A. Mesarch Jan 1990

Calibration Of Field Reference Panel And Radiometers Used In Fife 1989: Semi-Annual Report For Period February 1- September 30, 1990, B. L. Blad, E. A. Walter-Shea, C. J. Hays, M. A. Mesarch

School of Natural Resources: Documents and Reviews

No abstract provided.


Dehydration Tolerance Of Several Populus Deltoides Clones, G. Michael Gebre Dec 1989

Dehydration Tolerance Of Several Populus Deltoides Clones, G. Michael Gebre

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.


Reproductive Biology Of Pinus Sylvestris L.: Seed Yield, Flower Phenology, The Response Of Young Seedlings To Ga 4/7, And Developmental Anatomy, Teresa K. Boes Dec 1989

Reproductive Biology Of Pinus Sylvestris L.: Seed Yield, Flower Phenology, The Response Of Young Seedlings To Ga 4/7, And Developmental Anatomy, Teresa K. Boes

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.


Habitat Use And Diet Analysis Of Breeding Common Barn Owls In Western Nebraska, Joseph A. Gubanyi M.S. Apr 1989

Habitat Use And Diet Analysis Of Breeding Common Barn Owls In Western Nebraska, Joseph A. Gubanyi M.S.

School of Natural Resources: Dissertations, Theses, and Student Research

I studied barn owl (Tyto alba) breeding biology in western Nebraska 1984-1986. I had greatest success capturing males (56% success) at night using trap doors at nest sites and females (91 % success) using hoop nets at nest sites during the day. Barn owls removed 16 of 23 tail-mounted radios. Eight birds were radio-tracked for 7-14.5 hours. The mean foraging range was 198 ha (32- 299 ha, n = 8) with < 1 % overlap among birds from adjacent nest sites. Field-tested telemetry error was high (mean displacements of radio-locations for 2 birds were 208 and 241 m). I found no relationship between percent cover in foraging habitat and reproductive success. I identified 10,140 prey items from 15 nest sites and found both annual and seasonal variation in barn owl diets. Microtus ochrogaster occurred most frequently (32.7%) and increased in the diet from 17.6 to 27.2 to 43.5% 1984-1986. M. ochrogaster and Perognathus hispidus annual frequencies were …