Adaptation and challenges for giant clam species under marine heatwaves

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Global and Planetary Change Pub Date : 2025-02-14 DOI:10.1016/j.gloplacha.2025.104746

Jun Geng , Hong Yan , Chengcheng Liu , Nanyu Zhao , Shan Liu , Tao Han , John Dodson , Hanfeng Wen

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Abstract

Amid ocean warming, giant clams face serious threats, yet our understanding of their adaptation to marine heatwaves is limited compared to corals. In the South China Sea, a 9-year record of Tridacna gigas surviving recurrent heatwaves provides valuable insights. Our results indicate that the daily growth bands in T. gigas shell effectively track their growth responses to heatwaves. The T. gigas shell exhibits abnormal growth bands under mild to moderate cumulative heat stress caused by heatwaves but recovers as temperatures return to normal. However, following the severe cumulative heat stress in 1998, shell growth took 2.5 years to gradually return to pre-heat stress levels, indicating a significant negative impact. Unexpectedly, T. gigas has developed some degree of heat tolerance with repeated exposure to heatwaves. However, its ability to withstand heat stress increases non-linearly, and recovery slows significantly after exposure to severe heat stress. This raises concerns about its ability to adapt to future more frequent marine heatwaves.

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海洋热浪下巨蛤物种的适应与挑战

在海洋变暖的情况下，巨型蛤蜊面临着严重的威胁，但与珊瑚相比，我们对它们适应海洋热浪的了解有限。在南中国海，长达9年的砗磲蛤在反复出现的热浪中存活的记录提供了有价值的见解。我们的研究结果表明，T. gigas壳的日生长带有效地跟踪了它们对热浪的生长响应。在由热浪引起的轻度至中度累积热应激下，巨虾壳表现出异常的生长带，但当温度恢复正常时，壳会恢复正常。然而，在1998年严重的累积热胁迫之后，壳的生长花了2.5年的时间才逐渐恢复到热胁迫前的水平，这表明了显著的负面影响。出乎意料的是，巨齿龙在反复暴露于热浪中已经发展出一定程度的耐热性。然而，其承受热应激的能力呈非线性增长，并且在暴露于严重热应激后恢复速度显着减慢。这引起了人们对其适应未来更频繁的海洋热浪的能力的担忧。

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

Global and Planetary Change 地学天文-地球科学综合

CiteScore

7.40

自引率

10.30%

发文量

226

审稿时长

63 days

期刊介绍： The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.