Biology Commons^™

The Effect Of Light Intensity On The Incorporation Of Calcium Into The Carbonate Skeleton In Bossiella Orbigniania, Carol D. Logan

Loma Linda University Electronic Theses, Dissertations & Projects

The effect of light intensity on the incorporation of calcium carbonate into the algal skeleton inBossiala orbigniana (Descaisne) Silva (1957) (Corallinaceae) was studied. Calcium-45 labeling of terminal segments under experimental laboratory conditions was used to estimate calcification rate. Plant sections were tested under each of six light intensities ranging between zero (darkness) and 1960 pW^-2cm Calcium incorporation was found to be enhanced in light treatments as compared with dark treatment. Light of intensities ranging from 285 pW cm^-2 to 1960 pW cm^-2gave enhancement effects which were not significantly different from each other. Three alternate …

A Comparative Analysis Of Plant Response Parameters : To The Los Angeles Aqueduct Systems In The Mojave Desert, California, Edwin F. Archbold

Loma Linda University Electronic Theses, Dissertations & Projects

A comparative study of the two Los Angeles aqueduct systems was appropriate and feasible because of the 57 year span between construction dates. Although, dealing with complex interactive relationships of a variety of parameters and some unmeasurable aspects, this project attempted to get a closer look at the impacts of man-made constructions in the Mojave Desert.

Land managers and ecologists are particularly interested in answering the questions, how did the Mojave Desert perennial vegetation respond to a utility construction, such as the Los Angeles aqueduct, and what is the intensity of damage to plant cover. The recovery rates for vegetation …