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首页> 外文期刊>The Biological Bulletin >EMBRYOS AT THE EDGE OF TOLERANCE - EFFECTS OF ENVIRONMENT AND STRUCTURE OF EGG MASSES ON SUPPLY OF OXYGEN TO EMBRYOS
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EMBRYOS AT THE EDGE OF TOLERANCE - EFFECTS OF ENVIRONMENT AND STRUCTURE OF EGG MASSES ON SUPPLY OF OXYGEN TO EMBRYOS

机译：宽容边缘的胚胎-鸡蛋质的环境和结构对氧气供给胚胎的影响。

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摘要

Oxygen concentrations in gelatinous egg masses of two species of opisthobranch gastropods were examined with microelectrodes. Embryos in central positions are near the limit of the oxygen supply required for development. This limit is approached despite a diffusion constant for oxygen in masses that is close to that in water. Closed-chamber respirometry shows that oxygen is consumed by masses in the dark but generated in the light. Internal oxygen concentrations were greater in bright than in dim light. Thus photosynthesis and respiration of microorganisms associated with the masses affects the supply of oxygen to embryos within the mass. This effect of light was confirmed for egg masses of a polychaete. These observations, together with other published observations on the effects of hypoxia on development, indicate that the developmental rates of embryos in egg masses may depend on algal photosynthesis and metabolism. Flow around the masses also affects delivery of oxygen to embryos, but masses in dim light are at the limit of adequate supply even in a strong flow with a very thin boundary layer. Because the central embryos are near the Limit for adequate supply of oxygen by diffusion, their development rate thus depends on light, abundance of photosynthetic and heterotrophic microorganisms, flow, and oxygen concentration in the surrounding water.
机译：用微电极检查了两种鱼鳞腹足纲动物的胶状卵中的氧气浓度。处于中心位置的胚胎接近发育所需的氧气供应极限。尽管氧气在水中的扩散常数接近于在水中的扩散常数，但仍接近该极限。密室呼吸测定法显示，氧气在黑暗中被大量物质消耗，而在明亮的环境中产生。明亮时的内部氧气浓度大于昏暗的情况。因此，与团块有关的微生物的光合作用和呼吸作用会影响到团块内的胚胎的氧气供应。对于多毛卵的卵团，证实了光的这种作用。这些观察结果以及其他有关低氧对发育影响的观察结果表明，卵团中胚胎的发育速率可能取决于藻类的光合作用和代谢。团块周围的流动也会影响氧气向胚胎的输送，但是昏暗光线下的团块即使在边界层非常薄的强流中也受到了充足供应的限制。由于中心胚接近通过扩散提供足够氧气的极限，因此它们的发育速度取决于光，光合和异养微生物的丰度，流量以及周围水中的氧气浓度。

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