Distribution and population structure of introduced rainbow trout Oncorhynchus mykiss in Cyprus

IF 1.7 4区环境科学与生态学 Q3 ECOLOGY

Aquatic Ecology Pub Date : 2025-01-24 DOI:10.1007/s10452-025-10173-2

Michele Spairani, Bruno Boz, Athina Papatheodoulou, Anna Polazzo, Iakovos Tziortzis, Gerald Dörflinger, Alessandra Oggioni, Paolo Tremolada, Ayis Iacovides, Alessandro Balestrieri

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引用次数: 0

Abstract

Although rainbow trout Oncorhynchus mykiss has been widely introduced throughout Europe, self-sustaining populations are rare and unevenly distributed. In Cyprus, this invasive salmonid was introduced for recreational fishing at the end of the nineteenth century. To test whether rainbow trout have established in some water catchments of the island, between September 2020 and September 2022 we assessed the species’ distribution and analysed the age structure (by Bhattacharya’s method) and weight-length relationship of its major populations. The rainbow trout was recorded in 17 out of 86 sampling sites (19.7%), belonging to nine rivers and five catchments. Well-structured populations (N of cohorts ≥ 4) occurred in the River Kryos, where water temperatures were suitable for reproduction. Only a few individuals older than 4 years were sampled. Overall, both environmental conditions and population parameters suggest that the rainbow trout may self-sustain at least in the central, mountainous part of the island (rivers Kryos and Limnatis), where it occasionally coexists only with other introduced species. Nonetheless, its impact on native freshwater communities needs to be carefully assessed.

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塞浦路斯引进虹鳟鱼的分布及种群结构

尽管虹鳟鱼Oncorhynchus mykiss在整个欧洲被广泛引入，但自我维持的种群很少且分布不均匀。在塞浦路斯，这种入侵鲑鱼在19世纪末被引入休闲钓鱼。为了测试虹鳟鱼是否已经在岛上的一些集水区定居，在2020年9月至2022年9月期间，我们评估了该物种的分布，并分析了其主要种群的年龄结构（通过Bhattacharya的方法）和体重-长度关系。在86个采样点中的17个（19.7%）记录到虹鳟鱼，属于9条河流和5个集水区。Kryos河水温适宜繁殖，种群结构良好（N个队列≥4个）。只有少数4岁以上的个体被取样。总体而言，环境条件和种群参数都表明，虹鳟鱼至少可以在该岛中部山区（Kryos河和Limnatis河）自我维持，偶尔只与其他引进物种共存。然而，它对当地淡水群落的影响需要仔细评估。

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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来源期刊

Aquatic Ecology 环境科学-海洋与淡水生物学

CiteScore

3.90

自引率

0.00%

发文量

审稿时长

3 months

期刊介绍： Aquatic Ecology publishes timely, peer-reviewed original papers relating to the ecology of fresh, brackish, estuarine and marine environments. Papers on fundamental and applied novel research in both the field and the laboratory, including descriptive or experimental studies, will be included in the journal. Preference will be given to studies that address timely and current topics and are integrative and critical in approach. We discourage papers that describe presence and abundance of aquatic biota in local habitats as well as papers that are pure systematic. The journal provides a forum for the aquatic ecologist - limnologist and oceanologist alike- to discuss ecological issues related to processes and structures at different integration levels from individuals to populations, to communities and entire ecosystems.