Life Sciences Commons^™

Herbivory Effects On Thalassia Testudinum Leaf Growth And Nitrogen Content, J. C. Zieman, R. L. Iverson, John C. Ogden

Integrative Biology Faculty and Staff Publications

The pattern of turtle grazing on Thalassia testudinum in St. Croix seagrass beds begins with the establishment of a grazing plot by initial removal of leaf blades, followed by repeated grazing of several centimeter-long leaf blades within a maintained grazing area. Plants within the grazed area exhibit increased specific growth rate as a consequence of increased light flux to unepiphytized leaf bases. Leaf width is reduced in the grazed area as a consequence of grazing stress. The leaf bases contain a higher proportion of nitrogen and a lower lignin content than the leaf tips, in addition to lacking epiphytes. Our …

A Survey Of The Living Hermatypic Corals On The West Fore Reef Of Discovery Bay, Jamaica After The Occurence Of Hurricane Allen, James Arthur Crawford

Master's Theses

No abstract provided.

Inflorescence Architecture And Evolution In The Fagaceae, Robert B. Kaul, Ernst C. Abbe

School of Biological Sciences: Faculty Publications

First paragraph:

Inflorescence architecture is receiving increasing attention with respect to its role in the life of plants, but much remains to be learned of its effects on pollination and dispersal biology (see Wyatt, 1982). Little is known of the biology of fagaceous inflorescences or of their relationships with the growth or the reproductive patterns of the trees. Most studies (Abbe, 1974; Macdonald, 1979; Fey & Endress, 1983) have concentrated on the nature of the flower clusters (often called dichasia or partial inflorescences) and cupules. Hjelmqvist (1948) and Soepadmo (1972) briefly reviewed the variety of inflorescences in the Fagaceae. Čelakovský …

Inquiry Into The Causes And Significance Of Cytoplasmic Vacuolation Of Neutrophils In The Peripheral Circulation, Gary Xavier Haight

Dissertations and Theses

One-half million cases of septicemia are reported annually with a mortality of around 35%. Diagnosis depends in part on blood cultures which require one to two weeks. It would be advantageous if an early sign of septicemia were available.

Cytoplasmic vacuolation of polymorphonuclear neutropnils is occasionally seen in the peripheral blood smears of patients who have infections. The object of this work was to determine the cause and significance of cytoplasmic vacuolation with the goal of using the occurrence of vacuolation as an early indicator of infection.

Factors That Influence Plant Species Richness On Habitat Islands Of Sand Pine Scrub, Cindy B. Connery

Retrospective Theses and Dissertations

No abstract provided.

Applications Of Aerial Imagery In Identification Of Natural Areas, Kendall Duane Wessel

Dissertations and Theses @ UNI

There is current interest in utilizing aerial imagery to obtain information on natural vegetation. The purpose of this study is to utilize and evaluate commonly available aerial imagery to identify potential natural areas suitable for preservation and to initiate development of a procedure for imagery interpretation to meet this goal.

Clayton County, located in the northeastern quarter of the state of Iowa, was selected for study because it is dissected by steep, narrow stream valleys that are unsuitable for cultivation and may still possess native vegetation of a quality suitable for preservation.

Baseline or control communities were selected from known …

The Isolation And Identification Of Flavonoids In Zygocactus, Jacqueline M. Wade

Retrospective Theses and Dissertations

No abstract provided.

A Biosystematic Study Of The Fern Genus Lygodium In Eastern North America, Violet M. Brown

Retrospective Theses and Dissertations

The mainly tropical genus Lygodium differs from other ferns in that the fronds are indeterminate and are vine-like. A single species, L. palmatum is native in temperate North America. The temperate Asian L. japonicum is naturalized throughout much of the southeastern United States. About twenty years ago, L. microphyllum was introduced into South Florida and is now naturalized in several counties. The present study documents differences among spores and their generation, development of sporophytes from the fertilized egg, and in flavonoid chemistry. Hybridization experiments showed a strong possibility for cross fertility between species. Experiments with prothallial development and differentiation revealed …

A Revision Of Kyllinga Rottb. (Cyperaceae) In Mexico And Central America, Gordon C. Tucker

Gordon C. Tucker

No abstract provided.

A Revision Of Kyllinga Rottb. (Cyperaceae) In Mexico And Central America, Gordon Tucker

Faculty Research & Creative Activity

No abstract provided.

The Ontogeny And Functional Significance Of Luteinizing Hormone Releasing Hormone (Lhrh) Containing Centers Of The Brain Of The Freshwater Teleost, Xiphophorus Maculatus, Leslie R. Halpern-Sebold

Dissertations, Theses, and Capstone Projects

The use of cytometric, immunocytochemical and radioimmunological methods has allowed the investigation of the ontogeny and functional significance of LHRH containing centers in sibling platyfish (Xiphophorus maculatus) genetically determined to reach sexual maturity at different ages and in adult fish which were hypophysectomized and given replacement therapy with gonadotropin.

There is a sequential development of three immunoreactive (ir-) LHRH centers in the brain that is directly related to stage, not age of sexual maturation. The first region to contain ir-LHRH is the nucleus olfactoretinalis (NOR). Ir-LHRH then appears in the nucleus preopticus periventricularis (NPP), followed by the nucleus lateralis tuberis …

A Study Of Cladonia Cryptochlorophaea And Morphologically Similar Species In Illinois, Indiana, And Wisconsin, Scott S. Wilcer

Masters Theses

Collections of Cladonias with cup-shaped podetia were made in Illinois, Indiana, and Wisconsin in order to determine the distribution of an atranorin-containing variant of Cladonia cryptochlorophaea, which was discovered in 1982 in Coles County, Illinois by Cheryl Cunningham. A second objective was a distributional study of the Cladonias having cup-shaped podetia in the same three state area.

A total of 591 specimens were collected from the three states. The collection areas for Illinois were: Jackson Hollow in Pope County, Giant City State Park and Touch of Nature Interpretive Center in Jackson and Williamson Counties, Starved Rock State Park in …

A Revision Of Kyllinga Rottb. (Cyperaceae) In Mexico And Central America, Gordon C. Tucker

Faculty Research & Creative Activity

No abstract provided.

Food Habits And Body Composition Of Some Dominant Deep-Sea Fishes From Temperate And Tropical Regions Of The Western North Atlantic, Roy E. Crabtree

Dissertations, Theses, and Masters Projects

Food habits of 23 species of demersal deep-sea fishes from the temperate Middle Atlantic Bight and the tropical Bahamas region are described. In addition, body composition parameters including percent water, ash, carbon, and nitrogen are discussed for 48 demersal species from these study areas. Food habits data on Bahamian species are combined with those from other studies in an attempt to describe the trophic structure of this tropical deep-sea fish assemblage. Numerical classification techniques are used to group species based upon similarity of diets. Four groups are evident, including a group which feeds largely on polychaetes, a second which feeds …

Seasonal Shifts Of Photosynthesis In Portulacaria Afra (L.) Jacq., Lonnie J. Guralnick, Patricia A. Rorabaugh, Zac Hanscom

Arts & Sciences Faculty Publications

Portulacaria afra (L.) Jacq., a perennial facultative Crassulacean acid metabolism (CAM) species, was studied under natural photoperiods and temperatures in San Diego, California. The plants were irrigated every fourth day throughout the study period. Measurements of ¹⁴CO₂ uptake, stomatal resistance, and titratable acidity were made periodically from July 1981 through May 1982. P. afra maintained C₃ photosynthesis during the winter and the spring. Diurnal acid fluctuations were low and maximal ¹⁴CO₂ uptake occurred during the day. The day/night ratio of carbon uptake varied from 5 to 10 and indicated little nocturnal CO₂ uptake. CAM …

Extracellular Enzyme Production By Rhizopus And Mucor Species On Solid Media, D P. Thompson, Broderick Eribo

Broderick Eribo