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热耐受极限和生理特征可作为指示红毛菜耐受全球和局部变化驱动因素的适应能力的指标。

Thermal tolerance limits and physiological traits as indicators of Hediste diversicolor's acclimation capacity to global and local change drivers.

机构信息

ECOMARE - Laboratory for Innovation and Sustainability of Marine Biological Resources, CESAM - Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Estrada do Porto de Pesca Costeira, 3830-565, Gafanha da Nazaré, Portugal.

ECOMARE - Laboratory for Innovation and Sustainability of Marine Biological Resources, CESAM - Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Estrada do Porto de Pesca Costeira, 3830-565, Gafanha da Nazaré, Portugal.

出版信息

J Therm Biol. 2023 May;114:103577. doi: 10.1016/j.jtherbio.2023.103577. Epub 2023 Apr 27.

Abstract

Global projections predict significant increases in ocean temperature and changes in ocean chemistry, including salinity variations by 2100. This has led to a substantial interest in the study of thermal ecophysiology, as temperature is a major factor shaping marine ectotherm communities. However, responses to temperature may be influenced by other factors such as salinity, highlighting the relevance of multiple stressor studies. In the present work, we experimentally evaluated the thermal tolerance of the marine ragworm Hediste diversicolor under predicted global change scenarios. Organisms were subjected to an experimental trial under control (24 °C), and two temperature treatment scenarios (ocean warming +3 °C - (27 °C) and heat wave +6 °C - (30 °C)), combined with salinity variations (20 and 30) in a full factorial design for 29 days. Environmental data from the field were collected during 2019 and 2020. At day 30 post exposure, upper thermal limits (Critical Thermal Maximum - CTMax), thermal safety margins (TSM) and acclimation capacity were measured. Higher acclimation temperatures led to higher thermal tolerance limits, confirming that H. diversicolor features some physiological plasticity, acclimation capacity and a positive thermal safety margin. This margin was greater considering in situ temperature data from 2019 than maximum temperatures for 2020 (CTMax > maximum habitat temperature-MHT). Moreover, smaller organisms displayed higher upper thermal limits suggesting that thermal tolerance is size dependent. Ragworms subjected to higher salinity also showed a higher CTMax than those acclimated to lower salinity. However, temperature and salinity showed an additive effect on CTMax, as no significant interaction was detected. We conclude that H. diversicolor can easily acclimate to increased water temperature, independently of salinity variations. Given the key role of ragworms in food webs in estuaries and coastal lagoons, substrate bioturbation and aquaculture, this information is relevant to support conservation actions, optimize culture protocols and identify thermal resistant strains.

摘要

全球预测表明,海洋温度和化学性质将发生重大变化,包括到 2100 年盐度变化。这导致人们对热生态生理学的研究产生了浓厚的兴趣,因为温度是塑造海洋外温动物群落的主要因素。然而,对温度的响应可能会受到其他因素的影响,例如盐度,这凸显了多胁迫研究的相关性。在本工作中,我们根据预测的全球变化情景,实验评估了海洋沙蚕 Hediste diversicolor 的热耐受能力。在控制(24°C)和两种温度处理情景(海洋变暖+3°C-(27°C)和热浪+6°C-(30°C))下,生物体在实验试验中,结合盐度变化(20 和 30),在全因子设计中进行了 29 天的实验。在 2019 年和 2020 年期间收集了实地环境数据。在暴露后第 30 天,测量了上限热极限(临界热最大值 - CTMax)、热安全裕度(TSM)和适应能力。更高的适应温度导致更高的热耐受极限,这证实了 H. diversicolor 具有一些生理可塑性、适应能力和正热安全裕度。考虑到 2019 年的原位温度数据比 2020 年的最高温度(CTMax>最大栖息地温度-MHT),这种裕度更大。此外,较小的生物体表现出更高的上限热极限,这表明热耐受性与体型有关。在较高盐度下适应的沙蚕的 CTMax 也高于在低盐度下适应的沙蚕。然而,温度和盐度对 CTMax 有相加效应,因为未检测到显著的相互作用。我们得出结论,H. diversicolor 可以轻松适应水温升高,而与盐度变化无关。鉴于沙蚕在河口和沿海泻湖的食物网中、底质生物扰动和水产养殖中的关键作用,这些信息对于支持保护行动、优化养殖方案和识别耐热株很重要。

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