The removal from an alpine pond of the eggs of a salamander, Ambystoma gracile, had a large impact on the zooplankton community. The pond was dominated by large Daphnia while nearby ponds, from which salamander eggs were not removed, were dominated by the small cladoceran Diaphancscma . The size at maturity of Diaptomus copepods increased by 0.3 to 0.4 mm compared to the previous year. Crop content analyses revealed that food intake of Ilnd and Illrd instar Chaoborus was low. IVth instars were scarce and their dry weight was 50% lower than in the previous year. When Ambystoma is abundant, it preys heavily upon Holopedium gibberum and Daphnia rosea which are not available as food to Chaoborus trivittatus. The reduction in the density of large zooplankters permits a competitor, Diaphancscma brachyurum , to flourish. It is the main food source, when available, of Ilnd and Illrd instar Chaoborus . In this indirect way, Chaoborus depends on vertebrate predation to successfully reach its IVth instar. This lends support to Dodson's hypothesis of complementary feeding niches. / Science, Faculty of / Zoology, Department of / Graduate

Thesis (Ph.D.)--Tufts University, 1996. / Adviser: Frances S. Chew. Submitted to the Dept. of Biology. Includes bibliographical references (leaves 173-184). Access restricted to members of the Tufts University community. Also available via the World Wide Web;

Thesis (Ph. D.)--Florida State University, 2006. / Advisor: Henry W. Bass, Florida State University, College of Arts and Sciences, Dept. of Biological Science. Title and description from dissertation home page (viewed June 15, 2006). Document formatted into pages; contains x, 83 pages. Includes bibliographical references.

The muscle aldolase from Ambystoma tigrinum has been purified 73-fold to a final specific activity of 13.2 units per mg. The purified enzyme appeared to be homogenous by ultracentrifugation and electrophoretic criteria. A molecular weight of 159,000 + 1000 was determined by gel filtration on Sephadex G-200 and high speed sedimentation equilibrium ultracentrifugation. The enzyme migrated identically with rabbit muscle aldolase when subjected to sodium dodecyl sulfate polyacrylamide gel electrophoresis and is apparently a tetramer of nearly identical subunits of approximately 40,000 MW. The catalytic constants of the salamander enzyme were similar to those reported for other muscle aldolases with the exception of the unusually low Fru-P2/FlP ratio.

Thesis (M.S.)--Marshall University, 2002. / Title from document title page. Document formatted into pages; contains v, 51 p. with maps and illustrations. Includes vita. Includes bibliographical references (p. 24-26).

There is no abstract available for this dissertation.

Thesis (Ph. D.)--University of Minnesota, 1915. / Cover title. "Reprinted from the American jornal of anatomy, vol. 19, no. 2, March, 1916." Bibliography: p. 266-267.

Thesis (Ph. D.)--University of Minnesota, 1915. / Cover title. "Reprinted from the American jornal of anatomy, vol. 19, no. 2, March, 1916." Bibliography: p. 266-267.

No description available.

Thesis (M.S.)--Marshall University, 2003. / Title from document title page. Document formatted into pages; contains viii, 111 p. including illustrations. Includes vita. Includes bibliographical references (p. 35-38).