Abstract

Intertidal benthos monitoring has been conducted annually in two small bights of Kandalaksha Bay from the spring of 1987 up to the present. The observations covered all hydrological seasons (spring, summer, autumn, and winter) and were carried out at standard sites arranged in two transects, from the lower to the middle or higher intertidal level. Standardized methods of sampling and material processing were used within the entire study period. The long-term biomass dynamics of seven main species was analyzed using eigenvector filtering analysis and the dynamic phase portrait method. During the observation period, the structure of the communities studied varied over time, exhibiting trends in either biomass growth for some species or its decrease for others. A weak correlation was found between the main trends in the biomass dynamics of particular species and the main trend in change in the surface water layer temperature in summer in Chupa Inlet. Moreover, the community structure changed from time to time due to anomalous ice melting conditions in one of the explored bights. The analysis of other measured temporal variables allowed us to find out quasi-cyclic biomass changes in all species studied. The duration of the quasi-cycle varied for different species; in most cases, they were about 4–6 years. Along with that, quasi-cycles within the same species were asynchronous in different bights and even at different intertidal levels of one bight. They did not correlate with either the summer temperature or the quasi-cyclic salinity dynamics in the surface water layer. This allowed us to suggest that the described quasi-cycles were not induced by external factors, but represented self-oscillation processes.

中文翻译：

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白海坎达拉克夏湾两个小湾潮间带群落中几种物种的生物量动力学三十年

摘要

从1987年春季到现在，每年在Kandalaksha湾的两个小海湾中进行潮间底栖动物监测。观测涵盖了所有水文季节（春季，夏季，秋季和冬季），并在潮间水位从低到中或更高的两个断面的标准地点进行。在整个研究期内，均采用了标准化的抽样和材料处理方法。使用特征向量滤波分析和动态相画像法分析了七个主要物种的长期生物量动态。在观察期内，所研究的群落结构随时间变化，表现出某些物种生物量增长或其他物种生物量下降的趋势。在Chupa Inlet的特定物种的生物量动态的主要趋势与夏季地表水层温度变化的主要趋势之间发现弱相关性。此外，由于其中一处勘探区的异常融冰条件，群落结构不时发生变化。对其他测得的时间变量的分析使我们能够找出所有研究物种的准循环生物量变化。准周期的持续时间因物种而异。在大多数情况下，大约是4-6年。除此之外，同一物种内的准周期在不同的种群中甚至在一个种群的不同潮间水平上都是异步的。它们与夏季温度或地表水层中的准循环盐度动态均不相关。