Lam-Gordillo Orlando, Douglas Emily J, Hailes Sarah F, Cummings Vonda, Lohrer Andrew M
National Institute of Water and Atmospheric Research, Hamilton, New Zealand.
National Institute of Water and Atmospheric Research, Wellington, New Zealand.
Sci Rep. 2025 Jan 13;15(1):1812. doi: 10.1038/s41598-025-86310-6.
Ocean surface temperatures and the frequency and intensity of marine heatwaves are increasing worldwide. Understanding how marine organisms respond and adapt to heat pulses and the rapidly changing climate is crucial for predicting responses of valued species and ecosystems to global warming. Here, we carried out an in situ experiment to investigate sublethal responses to heat spikes of a functionally important intertidal bivalve, the venerid clam Austrovenus stutchburyi. We describe changes in metabolic responses under two warming scenarios (five days and seven days) at two sites (muddy and sandy). Tidal flat warming during every low tide for five days affected the abundance of multiple functional metabolites within this species. The metabolic response was related to pathways such as metabolic energetics, amino acid and lipid metabolism, and accumulation of stress-related metabolites. There was some recovery after cooler weather during the final two days of the experiment. The degree of change was greater in muddy versus sandy sediments. Our findings provide new evidence of the metabolomic response of these important bivalve to heat stress, which could be used for resource managers when implementing strategies to mitigate the impacts of climate change on valuable marine resources.
全球海洋表面温度以及海洋热浪的频率和强度都在上升。了解海洋生物如何应对和适应热脉冲以及迅速变化的气候，对于预测有价值的物种和生态系统对全球变暖的反应至关重要。在此，我们开展了一项原位实验，以研究一种具有重要功能的潮间带双壳贝类——文蛤（Austrovenus stutchburyi）对热脉冲的亚致死反应。我们描述了在两个地点（泥质和沙质）的两种升温情景（五天和七天）下代谢反应的变化。在每次低潮时将潮滩升温五天，影响了该物种内多种功能性代谢物的丰度。代谢反应与代谢能量学、氨基酸和脂质代谢以及应激相关代谢物的积累等途径有关。在实验的最后两天天气转凉后有一定程度的恢复。泥质沉积物中的变化程度大于沙质沉积物。我们的研究结果为这些重要双壳贝类对热应激的代谢组学反应提供了新证据，可用于资源管理者实施减轻气候变化对宝贵海洋资源影响的策略时参考。
