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  • Author or Editor: M. Kaufman x
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Results of two field experiments showed that selective removal of omnivorous mosquito larvae (Aedes triseriatus (Say)) functioning as top predators in the food web of a temperate, tree hole ecosystem resulted rapidly in increased abundance of flagellate and then ciliate populations. Flagellate density increased from <1 per ml to >103 per ml within 4 days of omnivore removal, followed shortly thereafter by an increase in ciliate density from <1 per ml to >102 per ml, after which flagellate density declined, and flagellate and ciliate densities stabilized. Rod-shaped bacteria increased slightly in density after removal of larval mosquitoes, then declined as protist density increased. Cocciform bacteria did not vary in density with these changes, thus the trophic cascade dampened at the remotest trophic level. Concomitant with the increase in protist densities, some bacteria formed elongated filaments >10 μm in length, likely an anti-predation, morphological response stimulated by suddenly intensified grazing as protozoan density rose. Results suggest that feeding by omnivorous mosquito larvae exhibited strong top-down effects on flagellate and ciliate populations, depressing them to below their equilibrium densities and nearly to extinction in tree hole ecosystems.

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Acta Mathematica Hungarica
Authors: J. Angelos, E. Kaufman, T. Lenker and M. Henry
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Journal of Radioanalytical and Nuclear Chemistry
Authors: L. Kaufman, D. Price, M. Holliday, B. Payne, D. Camp, J. Nelson and F. Deconninck

Abstract  

The fluorescent excitation analysis equipment and techniques developed at the University of California, San Francisco are reviewed and the recent advances and their impact on extending the applicability are discussed.

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