Abstract

The article describes the assessment of the primary (i.e., occurring before the onset of adaptation) reaction of coenosarc pulsations in the colonial hydroid Dynamena pumila (L., 1758) to decreased salinity and the associated changes in the growth and functioning of the distribution system. Time-lapse video microscopy has been used to register coenosarc pulsations of D. pumila stolons and stems in seawater with a salinity of 26‰ (control) and in seawater serially diluted to 20, 15, and 10‰. Video microscopy of colony coenosarc pulsations made it possible to monitor the colony’s reaction to salinity changes within approximately 2 h. D. pumila colonies did not show any distress in a salinity range of 26 to 20‰ at a temperature of 14°C, and the growth increment of stolons and stems, both in 1 h and in one pulsation, was the greatest under these conditions. The increment per pulsation by decreased 1.5 times at 15‰. Signs of stress, such as the cessation of stolon growth and a significant deceleration in stem growth, were observed at a salinity of 10‰. The period of growth pulsations of stem tips and stolons was doubled at 10‰. The reactions of the growth pulsation amplitude of the stolons and stems at 10‰ were different: the amplitude did not change in the stems but decreased by approximately ten times in the stolons. The resting phase of lateral pulsations and hydroplasm flows in both stems and stolons increased with decreasing salinity, which may be indicative of a decrease in propulsatory activity. Dissimilar changes in the rate of hydroplasm movement in the coenosarc module closest to the growth tip occurred in the stems and stolons: it decreased slightly in the stolons and significantly in the shoots.

中文翻译：

---

海水淡化对殖民地水DyDynamena pumila（L.，1758）的生长，共生脉动和水质运动的影响

摘要

这篇文章描述了对结肠液状Dynamena pumila（L.，1758）中的共鼻脉动的初级反应（即发生在适应发作之前）对盐度降低以及配水系统生长和功能的相关变化的评估。延时视频显微镜已被用于记录盐度为26‰（对照）的海水中以及依次稀释至20、15和10‰的海水中D. pumila stolon和茎的共鼻脉动。殖民地coenosarc脉动的视频显微镜使得可以在大约2小时内监测殖民地对盐度变化的反应。普米拉在14°C的温度下，菌落在26至20‰的盐度范围内未显示任何困扰，and茎和茎的生长增量（在1 h和一个脉冲中）在这些条件下最大。每个脉动的增量在15‰处减少了1.5倍。在盐度为10‰时，观察到了压力迹象，例如茎生长停止和茎生长显着减速。茎尖和sto茎的生长脉动周期增加了一倍，为10‰。sto茎和茎的生长脉动幅度在10‰处的反应是不同的：茎中的幅度没有变化，但茎中的幅度下降了大约十倍。随着盐度的降低，茎和茎中的横向脉动和水质流动的静止期增加，这可能表明推进活动减少。在最接近生长尖端的coenosarc组件中，水质运动速率的不同变化发生在茎和茎中：在茎茎中略有降低，在芽中则显着降低。