Abstract

In this study we analyze the characteristics of the cardiac activity of crayfish held on a long-term basis in an environment with high salinity (6.5‰) in order to find out the fundamental possibility of using them as bioindicators in bioelectronic systems for monitoring the quality of marine coastal waters under high anthropogenic load. Similar salinity values were noted for many bays of the Baltic Sea subregions, for example, the Tallinn and Bothnian bays, which are characterized by intense anthropogenic load. It is found that an increase in water salinity from 0 to 6.5‰ causes an initial short-term increase in heart rate (HR) by 30%. It has been shown that crayfish can not only successfully survive for 1 month in high salinity water, but also change the characteristics of cardiac activity to a small extent. Some features are revealed in crayfish in water with altered salinity. During exposure to saline solution, crayfish show a clear diurnal rhythm of cardiac activity. The rhythmicity of the heart rate disappears a few days before the molt in both fresh and salt water. This study makes it possible to come to a conclusion about the possibility of using freshwater crayfish in bioelectronic systems for the continuous monitoring of the functional state of representatives of the local biota and for identifying the biological effects of pollutants in both fresh and brackish water.

中文翻译：

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长期暴露于高盐度下的十足足 (Decapoda) 心脏活动：关于使用淡水小龙虾测试咸水的可能性

摘要

本研究分析了长期处于高盐度（6.5‰）环境中的小龙虾的心脏活动特征，以期找出将其作为生物电子系统中质量监测生物指示剂的根本可能性。高人为负荷下的沿海水域。波罗的海次区域的许多海湾也有类似的盐度值，例如塔林和波的尼亚海湾，这些海湾的特点是人为负荷强烈。研究发现，水盐度从 0 增加到 6.5‰ 会导致心率 (HR) 最初短期增加 30%。研究表明，小龙虾不仅能在高盐度水中成功存活1个月，而且还能小程度改变心脏活动的特征。小龙虾在盐度改变的水中会表现出一些特征。在暴露于盐水溶液期间，小龙虾表现出清晰的心脏活动昼夜节律。无论是在淡水还是盐水中，心率的节律性都会在蜕皮前几天消失。这项研究使人们有可能得出关于在生物电子系统中使用淡水小龙虾的可能性的结论，以连续监测当地生物群代表的功能状态并识别淡水和咸水中污染物的生物效应。