OXYGEN CONSUMPTION OF INSECT EGGS

Temperature-dependent oxygen limitation in insect eggs.

Most terrestrial insect embryos support metabolism with oxygen from the environment by diffusion across the eggshell. Because metabolism is more temperature sensitive than diffusion, embryos should be relatively oxygen-limited at high temperatures. We tested whether survival, development time and metabolism of eggs of a moth, Manduca sexta, were sensitive to experimentally imposed variation in ...

The respiratory mechanisms of some insect eggs.

Fertilization and the Temperature Coefficients of Oxygen Consumption in Eggs of Arbacia Punctulata

The eggs of A. punctulata have a high temperature coefficient in the resting state: Q(10) = 4.1. On fertilization and on cytolysis the temperature coefficient falls to less than half the resting value: Q(10) = 1.8 and 1.9 respectively. The factor by which oxygen consumption increases on fertilization is a variable, its magnitude depending on temperature as well as on egg species. It is nearly t...

Design and Testing of a Closed, Stirring Respirometer for Measuring Oxygen Consumption of Channel Catfish Eggs

—A closed, stirring respirometer was designed to agitate small egg mass samples of channel catfish Ictalurus punctatus while measuring oxygen consumption by the eggs. Egg mass samples ranging in size from 15 to 46 g were placed on a screen platform above a magnetic stir bar in the respirometer; the degree of agitation was controlled with a magnetic stir plate. Dissolved oxygen (DO) concentratio...

On the Rate of Oxygen Consumption by Fertilized and Unfertilized Eggs

1. The unfertilized eggs of Fucus vesiculosus, in the dark, consume about 5.2 mm.(3) O(2) per hour per 10 mm.(3) eggs. 2. With an illumination of 100,000 foot candles in photosynthesis they liberate more than twice as much oxygen as they consume. 3. The actively swimming antherozoids or sperm of Fucus consume oxygen at a very high rate: 25.5 mm.(3) O(2) per hour per 10 mm.(3) antherozoids. 4. I...