Abstract

The interannual and intraseasonal patterns of the spatiotemporal dynamics of the main commercial fishes from Lake Pskov, one of the most productive water bodies in northwestern Russia, are studied. The results of cartographic analysis of the summer–fall fish distributions in the lake are presented. The results of trawl surveys conducted in years that differed by the water level (2003, 2006, and 2008) were used as the input data. The initial data were aggregated into tables of attributes containing information on the trawling dates, trajectories, duration, average speed, water temperature, and the species and size composition of the catch. These tables were used to map the spatial distribution of seven fish species (bream, pikeperch, roach, perch, white bream, burbot, and ruff). Cartographic estimates of abundance are obtained for roach, pikeperch, bream, pike, and perch. An attempt is made to assess the reproduction efficiency of several fish species (pikeperch, perch, and pike) based on an analysis of their abundance variation from spring to autumn. Maps of the spatial distribution of the pikeperch that account for the size composition of the population are created. The discrepancy in the localization of different age groups in different seasons, along with their moving patterns, is ascertained. The patterns in the fish spatiotemporal dynamics are matched with the available hydrological characteristics.

中文翻译：

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普斯科夫湖鱼类的时空动态

摘要

研究了普斯科夫湖（俄罗斯西北部生产力最高的水体之一）主要商业鱼类时空动态的年际和季内模式。展示了对湖泊中夏秋季鱼分布的制图分析结果。在不同水位的年份（2003、2006 和 2008）中进行的拖网调查结果被用作输入数据。初始数据汇总到属性表中，其中包含有关拖网捕捞日期、轨迹、持续时间、平均速度、水温以及渔获物的种类和大小组成的信息。这些表用于绘制七种鱼类（鲷鱼、梭鲈、蟑螂、鲈鱼、白鲷、江鳕和河豚）的空间分布图。获得了蟑螂、梭鲈、鲷鱼、梭子鱼和鲈鱼。根据春季到秋季的丰度变化分析，尝试评估几种鱼类（鲈鱼、鲈鱼和梭鱼）的繁殖效率。创建了说明种群大小组成的梭鲈空间分布图。确定了不同季节不同年龄组的定位差异及其移动模式。鱼类时空动态的模式与可用的水文特征相匹配。创建了说明种群大小组成的梭鲈空间分布图。确定了不同季节不同年龄组的定位差异及其移动模式。鱼类时空动态的模式与可用的水文特征相匹配。创建了说明种群大小组成的梭鲈空间分布图。确定了不同季节不同年龄组的定位差异及其移动模式。鱼类时空动态的模式与可用的水文特征相匹配。