Life Sciences Commons^™

Effect Of Activity On Energy Allocation In The Northern Abalone, Haliotis Kamtschatkana (Jonas), Deborah A. Donovan, Thomas H. Carefoot

Biology Faculty and Staff Publications

The effect of activity, in the form of increased respiratory energy expenditure and secretion of mucus, on the summer and winter energy budgets of Haliotis kamtschatkana was assessed. Abalone exhibited seasonal variations in field activity with 20% of all individuals observed crawling during June to October, compared with -1 quiescent 12.0 h day^-1 alert. O.7 h day^-1 feeding, and 1.5 h day^-1 crawling during the summer, and 15.8 h day^-1 quiescent, 5.5 h day^-1 alert, 2.3 h day^-1 feeding, and o.4 h day^-1 crawling during the winter. Videotapes of abalone made over 24-h …

Double Mutant Analysis Of Headless And Head Only In The Wasp Nasonia Vitripennis., Amy Maule

WWU Honors College Senior Projects

Nasonia vitripennis is a relatively new model organism in the field of developmental genetics. It is a small, solitary, parasitic Hymenopteran found throughout the world. Recent research on Nasonia has primarily dealt with its mode of sex determination, and the reproductive isolation of species of Nasonia by a parasitic bacteria, Wolbachia (Werren 94). Like many Hymenopterans, Nasonia uses the haplo-diploid method of sex determination. In haplo-diploid organisms, fertilized eggs produce diploid females while unfertilized eggs produce haploid males. The system is a bit of a mystery, as it is possible to obtain fertile diploid males by setting triploid females unmated. …

The Influence Of Dispersal And Diet Breadth On Patterns Of Genetic Isolation By Distance In Phytophagous Insects, Merrill A. Peterson

Biology Faculty and Staff Publications

To determine the effects of dispersal ability and diet breadth on population-genetic structure, we reviewed the allozyme literature and estimated genetic isolation by distance (IBD) for 43 species/host races of phytophagous insects. Subsequently, we tested two opposing hypotheses regarding the influence of dispersal ability on IBD: that IBD slopes do not vary with mobility, but that intercepts increase with mobility, and, alternatively, that IBD slopes vary with dispersal ability. We found that from tens of kilometers to more than 1,000 km, IBD is weak in sedentary and highly mobile species but pronounced in moderately mobile species. We attribute the weak …

Mechanisms And Applications Of Enzymatic Thermostability, Julia Whitford

WWU Honors College Senior Projects

Imagine a hot summer day. What happens when the temperature climbs to a point above 100° F (38° C)? Depending on the place and the typical weather found in that location, reactions vary. Ice cream sales will probably go up. People may curse global warming as they seek shade. Others will head for the beach or community pool. Most forms of life, including human beings, aren't accustomed to that level of heat.

One special group of microorganisms, however, would find 100° F heat downright chilly. They are far more comfortable in temperatures nearly three times as warm as the hottest …

Correlates Of Average Daily Metabolism Of Field-Active Zebra-Tailed Lizards (Callisaurus Draconoides), William Karasov, Roger A. Anderson

Biology Faculty and Staff Publications

ABSTRACT The extent of variation in reptile field metabolism, and its causal bases, are poorly understood. We studied the energetics of the insectivorous lizard Callisaurus draconoides at a site in the California Desert (Desert Center) and at a site at the southern tip of the Baja Peninsula (Cabo San Lucas; hereafter, Cabo). Reproducing Callisaurus were smaller at Cabo than at Desert Center. The allometry of metabolism with body mass can account for most differences in whole-animal metabolism. There was no significant effect of sex or source population on mass-adjusted metabolic rate in the laboratory (resting metabolism, measured by closed-system respirometry) …

Seasonality In Digestive-Gland Size And Metabolism In Relation To Reproduction In Haliotis Kamtschatkana, Thomas H. Carefoot, Barbara E. Taylor, Deborah A. Donovan

Biology Faculty and Staff Publications

A novel method of isolating digestive gland cells in abalone was used to provide information on the metabolic activity of this gland in Haliotis kamtschatkana. Activity, expressed as percent ·change in Vo₂ of isolated cells before and after the addi­tion of glucose and amino acid substrates, was studied in relation to sex and to seasonal changes in gonad and digestive gland indices. At 3- to 4-mo intervals between May 1995 and July 1996, five collections of 10 adult abalone (equal sexes) were made from the West Coast of Vancouver Island, British Columbia. Each animal's live mass (without shell) was …