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Full-Text Articles in Life Sciences

Evaluation Of Selected Factors That May Influence The Application Of Electromagnetic Induction Technology To Soil Science Investigations In Iowa , Eric Charles Brevik Jan 2001

Evaluation Of Selected Factors That May Influence The Application Of Electromagnetic Induction Technology To Soil Science Investigations In Iowa , Eric Charles Brevik

Retrospective Theses and Dissertations

Many who engage in soil survey have long desired discovery of a remote sensing technique that differentiates individual soil series. As research in precision agriculture has begun, many other agricultural scientists have also begun evaluating remote sensing tools for soil mapping purposes. Soil electrical conductivity (EC), as measured by instruments including the Geonics RTM EM-38, has shown promise as a soil survey tool. Most of the work done along these fines to date has involved comparing soil EC patterns to Order 1 or 2 soil surveys. It is important that we understand how certain field conditions that might be encountered ...


Landscape Ecology Of Mammalian Predators And Its Relationship To Waterfowl Nest Success In The Prairie Pothole Region Of North Dakota , Michael Lee Phillips Jan 2001

Landscape Ecology Of Mammalian Predators And Its Relationship To Waterfowl Nest Success In The Prairie Pothole Region Of North Dakota , Michael Lee Phillips

Retrospective Theses and Dissertations

Mammalian predation is a major cause of mortality of breeding waterfowl in the Prairie Pothole Region. However, little is known about how landscape features influence the ability of predators to find waterfowl nests. I analyzed the habitat selection and movement patterns of radiomarked red fox ( Vulpes vulpes) and striped skunk (Mephitis mephitis) in two 41.4 km2 study areas with contrasting compositions of grassland (planted cover, pastureland and hayland). The study areas included either 10--15% (Low Grassland Composition, LGC) or 40--50% (High Grassland Composition, HGC) grassland. Edges of wetlands surrounded by cropland were consistently selected by fox and skunk on ...


Role Of The Dominant Phototrophic Bacterium In Anaerobic Swine Waste Lagoons, Rhodobacter Sp Ps9, In Odor Remediation , Young Sub Do Jan 2001

Role Of The Dominant Phototrophic Bacterium In Anaerobic Swine Waste Lagoons, Rhodobacter Sp Ps9, In Odor Remediation , Young Sub Do

Retrospective Theses and Dissertations

Temporal pigmentation changes in anaerobic swine waste lagoons were investigated during 4 year period. One commonly observed event in anaerobic swine waste lagoons is the development of purple color associated with the apparent reduction of odor intensity in late summer. The major purple phototrophic bacteria responsible for this color change and corresponding reduction in odor were isolated. Morphological, physiological, and phylogenetic characterization identified a predominant phototrophic bacterium as a new strain of Rhodobacter, designated Rhodobacter sp. PS9. Rhodobacter sp. PS9 is capable of photoheterotrophic growth on various organic compounds including all of the characteristic volatile organic compounds (VOC) responsible for ...


Assessment Of Diet And Consumption Dynamics Of The Adult Piscivorous Fish Community In Spirit Lake, Iowa , Hongsheng Liao Jan 2001

Assessment Of Diet And Consumption Dynamics Of The Adult Piscivorous Fish Community In Spirit Lake, Iowa , Hongsheng Liao

Retrospective Theses and Dissertations

We explored differences among four well-known indices (%W, %O, %N, and %IRI), plus a modified %IRI (%MIRI), examined diet and consumption dynamics of black crappie (Pomoxis nigromaculatus), largemouth bass (Micropterus salmoides), northern pike (Esox lucius ), smallmouth bass (Micropterus dolomieui), walleye (Stizostedion vitreum), and yellow perch (Perca flavescens ) in Spirit Lake, Iowa, in 1995--1997. %W and %MIRI emphasizes importance of large prey taxa, even when relatively rare in diets, whereas %O and %N emphasize small prey common in diets. %IRI yielded intermediate results. Using %IRI, we found that the most important prey taxa overall were yellow perch, Decapoda, and Amphipoda. Largemouth ...


Evaluation Of A Collaborative Approach To Mediate Conflict Between Parties With Interests In Wildlife And Livestock In Colorado , Gina Marie Mcandrews Jan 2001

Evaluation Of A Collaborative Approach To Mediate Conflict Between Parties With Interests In Wildlife And Livestock In Colorado , Gina Marie Mcandrews

Retrospective Theses and Dissertations

The Habitat Partnership Program (HPP) is a collaborative initiative of the Colorado Division of Wildlife and the Colorado Cattleman's Association. The program consists of 15 committees, distributed over western Colorado, representing the interests of public resource managers, livestock growers and hunters. Through partnerships and projects, each committee strives to reduce fence damage and forage loss from big game activity. Information gathered from interviews, documents, projects and observation was used to assess the effectiveness of HPP in meeting its stated goals: resolve conflicts, improve ecosystem health, raise local knowledge about resource management and improve communication and understanding. Over seven years ...


The Influence Of Vegetation, Microbial Inoculation, And Aging Of Pesticide Residues On The Degradation Of Atrazine And Metolachlor In Soils , Shaohan Zhao Jan 2001

The Influence Of Vegetation, Microbial Inoculation, And Aging Of Pesticide Residues On The Degradation Of Atrazine And Metolachlor In Soils , Shaohan Zhao

Retrospective Theses and Dissertations

The bacteria Agrobacterium radiobacter J14a and Pseudomonas sp. strain ADP and the enzyme atrazine chlorohydrolase all had a significant effect on the degradation of atrazine in Alpha soil, a soil with a low indigenous atrazine-mineralizing population. However, inoculation with J14a did not increase the atrazine degradation in Bravo soil, a soil with a high number of indigenous atrazine-mineralizing microorganisms. This suggests that the ability of J14a to enhance the degradation of atrazine is affected by the presence of indigenous atrazine-mineralizing microorganisms. Inoculation of Pseudomonas fluorescens UA5-40 did not enhance the transformation of metolachlor in either soil.;The ability of native ...


Quantitation Of Bound Pesticide Residues In Field And Wetland Soils , Larry Warren Wulf Jan 2001

Quantitation Of Bound Pesticide Residues In Field And Wetland Soils , Larry Warren Wulf

Retrospective Theses and Dissertations

A sequential extraction scheme was developed for the quantitation of extractable and bound pesticide residues in field and wetland soils. Extractable and bound fractions of pesticides in soil were measured in spiked field and wetland soils that were stored for periods of up to ninety days. Treatment conditions included microbiological control through the use of irradiated soil and biocide. Bound pesticide residue formation was also studied as affected by moisture level, dark and light storage, and concentration. The water column of wetland microcosms was dosed with pesticides to study sorption behavior of pesticides in intact wetland systems. Extractable pesticide degradation ...