菱鲆的生态学研究。在浅水干涸的过程中。

P A Genkel', N D Pronina
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摘要

本文研究了干燥对绿藻Zygnema的影响。Zygnema是共轭目zygnemacae科的一种典型水生形式。青豆的无性繁殖以两种不同的方式发生,花丝分离。结果表明,在干燥过程中,细胞形态发生变化。分裂后,大多数细胞形成正方形。它们通常是分裂前营养细胞的一半大。色素团的形态和颜色也发生变化;它们变成了绿棕色,也就是说,Zygnema处于静止状态,因为没有观察到细胞分裂。在这种休息状态下,花丝遭受夏季干旱的不利条件。在秋天,8月底,随着白天的缩短和温度的降低,藻类产生孤雌孢子进行越冬。
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Ecology of Zygnema stellinum Vauch. during desiccation of a shallow body of water.

the effect of desiccation on the green alga Zygnema, a typical aquatic form of the order Conjugatae, family Zygnemaceae, is investigated. The vegetative reproduction of Zygnema occurs with the separation of the filaments in two different ways. It is shown that changes take place in cell morphology during desiccation. After division most of the cells acquire the shape of a square. These are usually half as large as the vegetative cells prior to division. Also, the form and color of the chromatophores change; they become green-brown, i.e., Zygnema falls into a state of rest, since no cell division is observed. During this state of rest the filaments suffer the unfavorable conditions of summer drought. In the fall, at the end of August, with the shortening of the day and reduction of temperature, the alga develops parthenospores for overwintering.

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