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Do lake-specific characteristics mediate the temporal relationship between walleye growth and warming water temperatures?
Canadian Journal of Fisheries and Aquatic Sciences ( IF 2.4 ) Pub Date : 2021-02-10 , DOI: 10.1139/cjfas-2020-0169
Danielle L. Massie 1 , Gretchen J.A. Hansen 2 , Yan Li 3 , Greg G. Sass 4 , Tyler Wagner 5
Affiliation  

Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
Walleye (Sander vitreus) population declines have been linked to climate change, but it is unclear how the growth of this cool-water species may be affected by warming water temperatures. Because warming rates vary among lakes, it is uncertain whether lake characteristics may mediate the temperature effects on walleye growth or may vary as a result of differences in lake habitat or productivity. In this study, we (i) quantified walleye annual growth from 1983 to 2015 in 61 lakes in midwestern United States; (ii) estimated the relationship between annual early life growth (ω; mm·year–1) and water growing degree days (GDD); and (iii) identified lake characteristics affecting loge(ω)–GDD relationships. On average, ω estimates significantly increased with increasing GDD; however, this relationship varied in direction and magnitude among lakes. We estimated an 84% posterior probability of a negative effect of water clarity on the loge(ω)–GDD relationship, suggesting that water clarity may mediate the effect of warming water temperatures by affecting the magnitude and direction of the loge(ω)–GDD relationship. Our results provide insights into the conservation of cool-water species in a changing environment and identify lakes characteristics in which walleye growth may be more resilient to climate change.


中文翻译:

湖泊特有的特征是否介导了角膜白斑生长与水温变暖之间的时间关系?

加拿大渔业和水产科学杂志,提前印刷。
角膜白斑(Sander vitreus)人口下降与气候变化有关,但目前尚不清楚这种冷水物种的生长会如何受到水温升高的影响。由于湖泊的升温速率不同,因此不确定湖泊特征是否会调节温度对角膜白斑生长的影响,或者是否可能因湖泊栖息地或生产力的差异而有所不同。在这项研究中,我们 (i) 量化了美国中西部 61 个湖泊从 1983 年到 2015 年的角膜白斑年增长率;(ii) 估计生命早期年增长率 (ω; mm·year–1) 与水生度日 (GDD) 之间的关系;(iii) 确定影响 loge(ω)-GDD 关系的湖泊特征。平均而言,ω 估计值随着 GDD 的增加而显着增加;然而,这种关系在不同湖泊的方向和大小上各不相同。我们估计水透明度对 loge(ω)-GDD 关系的负面影响的后验概率为 84%,表明水透明度可能通过影响 loge(ω)-GDD 的幅度和方向来调节水温升高的影响关系。我们的研究结果为在不断变化的环境中保护冷水物种提供了见解,并确定了角膜白斑生长可能对气候变化更具弹性的湖泊特征。
更新日期:2021-02-10
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