The quagga mussel Dreissena rostriformis bugensis is a highly invasive species. It plays an important role in benthic communities, influencing their structure and functioning. Two morphs of this mussel have been described: a shallow-water (i.e. the typical) morph and a deep-water morph, profunda. Currently, profunda has been found in several water bodies only within the nonnative range of D. r. bugensis. In North America, the profunda morph is widespread and abundant in the Laurentian Great Lakes. In Europe, profunda was found for the first time in 2009 in the Cheboksary Reservoir, which is located on the central part of the Volga River. A 2016 search for profunda in the four deepest Volga reservoirs (Cheboksary, Kuybyshev, Saratov and Volgograd) failed to find this morph even at the site where it was found in 2009. Traditional and outline-based morphometric analyses showed that only the shallow-water morph individuals inhabited studied sites at depths of 25–33 m. The present study revealed that morphological differences between the typical and profunda morphs from both the European and North American ranges were accompanied by limited genetic differences. Microsatellite analysis showed only minor differences in allele frequencies between morphs sampled in 2019 from the Cheboksary Reservoir; these differences were not significant after correction for null alleles. High phenotypic and ecological plasticity of D. r. bugensis may facilitate its invasion success.

中文翻译：

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俄罗斯伏尔加河水库中斑斑贻贝 (Dreissena rostriformis bugensis) 深形态的发生有限，俄罗斯和北美形态之间的遗传差异有限

斑驴贻贝 Dreissena rostriformis bugensis 是一种高度入侵物种。它在底栖生物群落中发挥着重要作用，影响其结构和功能。已经描述了这种贻贝的两种变体：浅水（即典型）变体和深水变体 profunda。目前，仅在 D. r. 的非原生范围内的几个水体中发现了深水。臭虫。在北美洲，深变型在劳伦森五大湖分布广泛且丰富。在欧洲，2009 年首次在位于伏尔加河中部的切博克萨雷水库中发现了深渊。2016 年在伏尔加河最深的四个水库（切博克萨瑞、古比雪夫、萨拉托夫和伏尔加格勒）中寻找深渊，即使在 2009 年发现的地点也未能找到这种形态。传统和基于轮廓的形态测量分析表明，只有浅水形态个体居住在 25-33 m 深度的研究地点。本研究表明，欧洲和北美范围内的典型和深部形态之间的形态差异伴随着有限的遗传差异。微卫星分析显示，2019 年从切博克萨瑞水库采样的变体之间的等位基因频率仅存在微小差异；在对无效等位基因进行校正后，这些差异并不显着。D. r. 的高表型和生态可塑性 bugensis 可能有助于其入侵成功。本研究表明，欧洲和北美范围内的典型和深部形态之间的形态差异伴随着有限的遗传差异。微卫星分析显示，2019 年从切博克萨瑞水库采样的变体之间的等位基因频率仅存在微小差异；在对无效等位基因进行校正后，这些差异并不显着。D. r. 的高表型和生态可塑性 bugensis 可能有助于其入侵成功。本研究表明，欧洲和北美范围内的典型和深部形态之间的形态差异伴随着有限的遗传差异。微卫星分析显示，2019 年从切博克萨瑞水库采样的变体之间的等位基因频率仅存在微小差异；在对无效等位基因进行校正后，这些差异并不显着。D. r. 的高表型和生态可塑性 bugensis 可能有助于其入侵成功。D. r. 的高表型和生态可塑性 bugensis 可能有助于其入侵成功。D. r. 的高表型和生态可塑性 bugensis 可能有助于其入侵成功。