Two Life Strategies in Copepod Cryptic Species: Coexistence and Displacement

Pub Date : 2023-12-29 DOI:10.1134/s2075111723040161

N. Sukhikh, V. Alekseev

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Abstract

Among invasive species there is a special group so named cryptic species for which morphological identification is very difficult. This review is devoted to analysis of the dispersal routes of two copepod cryptic species complexes into aquatic ecosystems. Eurytemora carolleeae introduction was revealed in 2007 with bar-code. The species was described as a new taxon; its distribution was also studied using morphology. Biological invasions of two other Copepod species Acanthocyclops americanus and Eurytemora caspica were mainly studied using morphological methods since the species have already been described. At the same time, to confirm their distinctions from local forms molecular genetic tools were also used. Two scenarios resulting from cryptic species’ invasions and their competitions with native species were the partly (E. carrolleeae) or full displacement (A. americanus). When assessing the possible negative impact of invasive species on competitors, the most attention should be paid to predator species. Identification of cryptic species significantly complicates the situation with the assessment of bioinvasion and needs the use of molecular methods.

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桡足类隐蔽物种的两种生活策略：共存与迁移

摘要在入侵物种中，有一类特殊的物种被命名为隐蔽物种，其形态鉴定非常困难。这篇综述专门分析了两种桡足类隐蔽物种群在水生生态系统中的扩散路线。Eurytemora carolleeae的引入是在2007年通过条形码发现的。该物种被描述为一个新类群；还利用形态学研究了其分布。对另外两个桡足类物种 Acanthocyclops americanus 和 Eurytemora caspica 的生物入侵主要采用形态学方法进行研究，因为这两个物种已经被描述过。同时，为了确认它们与当地形态的区别，还使用了分子遗传工具。隐蔽物种的入侵及其与本地物种的竞争导致了两种情况，一种是部分入侵（E. carrolleeae），另一种是完全迁移（A. americanus）。在评估入侵物种对竞争者可能产生的负面影响时，最应注意的是捕食物种。对隐性物种的鉴定使生物入侵评估工作变得更加复杂，需要使用分子方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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