Do rusty crayfish (Faxonius rusticus) invasions affect water clarity in north temperate lakes?

IF 1.4 4区 环境科学与生态学 Q3 LIMNOLOGY Limnology Pub Date : 2021-11-20 DOI:10.1007/s10201-021-00683-x
Szydlowski, Daniel K., Daniels, Melissa K., Larson, Eric R.
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Abstract

Invasive crayfish can cause shifts in lakes from clear, macrophyte-dominated states to eutrophic, phytoplankton-dominated states because of their burrowing and foraging behavior. While invasive crayfish populations have been linked to declines in water clarity of shallow lakes and wetlands in Asia and Europe, little research has been done on the potential for similar effects of invasive rusty crayfish (Faxonius rusticus) in large temperate lakes of the Midwestern USA. We related F. rusticus abundance in 17 lakes of northern Wisconsin, USA over time (1984‒2018) to measures of lake clarity (chlorophyll a concentration and Secchi disc depth) estimated from remote sensing (Landsat imagery). Contrary to the effects of invasive crayfish in other study systems, we found a weak, positive association between F. rusticus abundance and water clarity. We propose that lake clarity may increase if declines in small fishes caused by F. rusticus lead to population growth of zooplankton and consequent decreases in phytoplankton through a trophic cascade. Alternatively, F. rusticus could be passengers to, rather than drivers of, lake clarity trends, responding positively to increased littoral benthic productivity when lakes are clearer. Future research should aim to determine if F. rusticus causes or responds to changes in water clarity, but should also investigate the impacts of crayfish invasions on water clarity across a greater variety of lentic ecosystems.

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生锈的小龙虾(Faxonius rusticus)入侵会影响北温带湖泊的水质清晰度吗?
由于小龙虾的挖洞和觅食行为,它们会导致湖泊从清澈、以大型植物为主的状态转变为富营养化、以浮游植物为主的状态。虽然亚洲和欧洲的浅水湖泊和湿地的水清晰度下降与入侵小龙虾种群有关,但对美国中西部大型温带湖泊中入侵的生锈小龙虾(Faxonius rusticus)的潜在影响进行的研究很少。我们将美国威斯康星州北部17个湖泊的F. rusticus丰度随时间(1984-2018)与遥感(Landsat图像)估计的湖泊清晰度(叶绿素a浓度和Secchi盘深度)相关联。与其他研究系统中入侵小龙虾的影响相反,我们发现F. rusticus丰度与水的清晰度之间存在微弱的正相关关系。我们认为,如果由褐螺旋藻引起的小型鱼类数量减少导致浮游动物数量增加,进而通过营养级联导致浮游植物数量减少,那么湖泊的清晰度可能会增加。另外,当湖泊变得更清澈时,F. rusticus可能是湖泊清澈趋势的乘客,而不是驱动者,对增加的沿海底栖生物生产力作出积极的反应。未来的研究应该着眼于确定是rusticus引起还是响应了水的清晰度变化,但也应该调查小龙虾入侵对更多种生态系统中水的清晰度的影响。
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来源期刊
Limnology
Limnology 地学-湖沼学
CiteScore
4.30
自引率
6.20%
发文量
15
审稿时长
>12 weeks
期刊介绍: Limnology is a scientific journal published three times a year, in January, April, and August, by Springer in association with the Japanese Society of Limnology. The editors welcome original scientific contributions on physical, chemical, biological, or related research, including environmental issues, on any aspect of basic, theoretical, or applied limnology that present significant findings for the community of scholars. The journal publishes Rapid communications, Research papers, Review articles, Asia/Oceania reports, and Comments. The aims and scope of Limnology are to publish scientific and/or technical papers in limnological sciences, to serve as a platform for information dissemination among scientists and practitioners, to enhance international links, and to contribute to the development of limnology.
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