Long distance swimmers in warming waters: Active transport in postlarval American lobsters (Homarus americanus) in the context of climate change in the Gulf of Maine

IF 2.2 2区 农林科学 Q2 FISHERIES Fisheries Research Pub Date : 2024-07-21 DOI:10.1016/j.fishres.2024.107112
Jason S. Goldstein , Benjamin C. Gutzler , Abigail Lemmon , Joshua T. Carloni , Marlies Betka , Steven H. Jury
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Abstract

Recent declines in American lobster (Homarus americanus) settlement in the Gulf of Maine (GoM) have raised questions concerning the effects of climate change on lobster recruitment. Postlarval lobsters are strong swimmers that typically transit to inshore settlement habitats, an energy-intensive process that may be a metabolic bottleneck. Using 72-hr laboratory swimming challenges, we tested the performance of laboratory-reared postlarvae at historically favorable temperatures (15°C), as well as projected end-of-century GoM temperatures (22°C) to determine if increased water temperatures may impair the swimming abilities needed to reach settlement habitats. Video observation and analysis revealed that postlarvae in the 22°C treatment spent 25 % less time actively swimming compared with postlarvae at 15°C. Postlarvae in the 22°C swimming trials also had lower lipid content after the swimming challenge when compared with pre-trial controls; however, dry weight and protein content were not significantly different between the treatment groups. When sequential trials were run using postlarvae from the same clutch, dry weights increased with time since metamorphosis. Metabolic rates for lobsters increase in warmer temperatures, so it is possible that decreased swimming at warmer temperatures may be an adaptive strategy for energy conservation in less favorable, thermally stressful, conditions. Overall, decreased swimming activity in warmer waters may be a contributing factor in shifting patterns of lobster recruitment in the GoM.

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变暖水域中的长距离游泳者:缅因湾气候变化背景下美洲龙虾(Homarus americanus)幼体的主动迁移
最近,缅因湾(GoM)美国龙虾(Homarus americanus)定居量的下降引发了气候变化对龙虾繁殖影响的问题。幼体后的龙虾游泳能力很强,它们通常会游到近岸的定居栖息地,这是一个能量密集型过程,可能是一个新陈代谢瓶颈。通过72小时的实验室游泳挑战,我们测试了实验室饲养的后生龙虾在历史适宜温度(15°C)以及预计的本世纪末全球海洋观测系统温度(22°C)下的表现,以确定水温升高是否会损害到达定居栖息地所需的游泳能力。视频观察和分析表明,22°C处理中的幼体与15°C处理中的幼体相比,主动游泳的时间减少了25%。与试验前的对照组相比,22°C游泳试验中的后生幼体在游泳挑战后的脂质含量也较低;但是,各处理组之间的干重和蛋白质含量没有显著差异。使用同一窝的幼体进行连续试验时,干重会随着变态时间的延长而增加。龙虾的新陈代谢率在温度较高时有所增加,因此在温度较高时减少游泳可能是一种适应性策略,以便在较差的热应力条件下节约能量。总体而言,在温度较高的水域中游泳活动减少可能是导致戈尔诺-卡拉巴赫龙虾招募模式变化的一个因素。
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来源期刊
Fisheries Research
Fisheries Research 农林科学-渔业
CiteScore
4.50
自引率
16.70%
发文量
294
审稿时长
15 weeks
期刊介绍: This journal provides an international forum for the publication of papers in the areas of fisheries science, fishing technology, fisheries management and relevant socio-economics. The scope covers fisheries in salt, brackish and freshwater systems, and all aspects of associated ecology, environmental aspects of fisheries, and economics. Both theoretical and practical papers are acceptable, including laboratory and field experimental studies relevant to fisheries. Papers on the conservation of exploitable living resources are welcome. Review and Viewpoint articles are also published. As the specified areas inevitably impinge on and interrelate with each other, the approach of the journal is multidisciplinary, and authors are encouraged to emphasise the relevance of their own work to that of other disciplines. The journal is intended for fisheries scientists, biological oceanographers, gear technologists, economists, managers, administrators, policy makers and legislators.
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