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Walleye growth declines following zebra mussel and Bythotrephes invasion
Biological Invasions ( IF 2.9 ) Pub Date : 2020-01-24 , DOI: 10.1007/s10530-020-02198-5
Gretchen J. A. Hansen , Tyler D. Ahrenstorff , Bethany J. Bethke , Joshua D. Dumke , Jodie Hirsch , Katya E. Kovalenko , Jaime F. LeDuc , Ryan P. Maki , Heidi M. Rantala , Tyler Wagner

Invasive species represent a threat to aquatic ecosystems globally; however, impacts can be heterogenous across systems. Documented impacts of invasive zebra mussels (Dreissena polymorpha) and spiny water fleas (Bythotrephes cederströmii; hereafter Bythotrephes) on native fishes are variable and context dependent across locations and time periods. Here, we use a hierarchical Bayesian analysis of a 35-year dataset on two fish species from 9 lakes to demonstrate that early life growth of ecologically important fishes are influenced by these aquatic invasive species. Walleye (Sander vitreus) in their first year of life grew more slowly in the presence of either invader after correcting for temperature (measured by degree days), and were on average 12 or 14% smaller at the end of their first summer following invasion by Bythotrephes or zebra mussels, respectively. Yellow perch (Perca flavescens) growth was less affected by invasion. Yellow perch on average grew more slowly in their first year of life following invasion by zebra mussels, although this effect was not statistically distinguishable from zero. Early life growth of both walleye and yellow perch was less tightly coupled to degree days in invaded systems, as demonstrated by increased variance surrounding the degree day-length relationship. Smaller first-year size is related to walleye survival and recruitment to later life stages and has important implications for lake food webs and fisheries management. Future research quantifying effects of zebra mussels and Bythotrephes on other population-level processes and across a wider gradient of lake types is needed to understand the mechanisms driving observed changes in walleye growth.



中文翻译:

斑马贻贝和拜特菲斯入侵后,角膜白斑的生长下降

外来入侵物种对全球水生生态系统构成威胁;但是,影响在整个系统中可能是不同的。侵入性斑马贻贝(Dreissena polymorpha)和多刺水蚤(Bythotrephescederströmii;以下称Bythotrephes)对本地鱼类的影响有据可依,并且在不同地点和时间段内依情况而定。在这里,我们对来自9个湖泊的两种鱼类的35年数据集进行了分级贝叶斯分析,以证明具有生态重要性的鱼类的早期生长受到这些水生入侵物种的影响。角膜白斑(Sander玻璃体)在校正温度后(根据度数天数衡量),在有入侵者存在的情况下,他们生命的第一年生长缓慢,并且在被拜特菲斯或斑马贻贝入侵后的第一个夏季末平均缩小了12%或14%, 分别。黄鲈(Perca flavescens)的增长受到入侵的影响较小。黄斑鲈在斑马贻贝入侵后的生命的第一年平均增长速度较慢,尽管从统计学上讲,这种影响不能从零区分出来。在入侵系统中,角膜白斑和黄鲈的早期生活增长与度数之间的联系不那么紧密,这可以通过度数与日长关系的方差增加来证明。第一年的规模较小,与角膜白斑的存活和到晚年的生活有关,对湖泊食物网和渔业管理具有重要意义。需要进一步的研究来量化斑马贻贝和斑tho鱼对其他种群水平过程以及更大范围的湖泊类型的影响,以了解驱动观察到的角膜白斑变化的机制。

更新日期:2020-04-20
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