. The Biological bulletin. Biology; Zoology; Marine biology. OXYGEN IN EGG MASSES 13 Production and consumption of oxygen in a closed chamber by four masses of Melanochlamys diomedea in light and dark Table IV Consumption of oxygen per egg mass and per embryo for four masses of Melanochlamys diomedea in a closed chamber in the dark; all were at early veliger stage Production in Consumption in Volume light dark of mass (^mol O2 min"') (/tmol O2 min~') (mm^) Stage Temperature (°C) Consumption (^mol O2 min~') Volume of mass Embryos (mm') per mass Consumption per embryo (lO-^Mlh-') Temperatur
. The Biological bulletin. Biology; Zoology; Marine biology. OXYGEN IN EGG MASSES 13 Production and consumption of oxygen in a closed chamber by four masses of Melanochlamys diomedea in light and dark Table IV Consumption of oxygen per egg mass and per embryo for four masses of Melanochlamys diomedea in a closed chamber in the dark; all were at early veliger stage Production in Consumption in Volume light dark of mass (^mol O2 min"') (/tmol O2 min~') (mm^) Stage Temperature (°C) Consumption (^mol O2 min~') Volume of mass Embryos (mm') per mass Consumption per embryo (lO-^Mlh-') Temperature (°C) 630 veliger 20 600 cleaving 20 527 14960 20 271 hatching 20 471 18390 20 352 vehger 12 670 452 9139 23910 20 20 452 23910 12 acterized, but light had a pronounced effect on oxygen concentrations within the mass. Oxygen production and consumption in light and dark Fouled masses of M. diomedea produced oxygen in bright light (Table III, Fig. 3). Microbial photosynthesis can be large relative to respiration by embryos. In the dark, the masses consumed oxygen (Table III, Fig. 3). In the dark, the mean estimated respiration per embryo at 20°C was X 10"^ ^1 h"' (Table IV), which is close to that expected for hatched and swimming veligers of similar size (Bayne, 1983). This agreement may not reflect real similarity in the respiration rates of hatched and un- hatched larvae. Instead, respiration by microorganisms may be inflating the oxygen consumption per unhatched veliger. Oxygen consumption per embryo was calculated from consumption by whole masses, and the variation in es- timates could therefore be a result of differences in foul- ing by microorganisms. The highest estimate ( X 10"^ ^l\ oxygen h~') exceeds that expected for hatched ve- ligers of similar size (Bayne, 1983), and respiration by microorganisms may account for the excess.
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