极端温度的影响和亚得里亚海北部沿海泻湖中鲃鱼的恢复潜力:异地方法。

IF 3.6 2区 生物学 Q1 PLANT SCIENCES Annals of botany Pub Date : 2024-08-22 DOI:10.1093/aob/mcae038
Andrea Bilajac, Edi Gljušćić, Shannen Smith, Mirjana Najdek, Ljiljana Iveša
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引用次数: 0

摘要

背景和目的:在全球范围内,海水温度的上升导致海洋大型藻类森林的退化。在伊斯特拉海岸线(亚得里亚海北部)的一个沿海泻湖中,一个孤立的钩吻藻种群持续存在,是该地区最后的海洋大型藻类森林之一。我们的目的是研究极端温度对钩吻藻形态和生理的影响,并测试其在模拟海洋热浪(MHW)条件下的恢复潜力:方法:我们调查了研究区域附近伊斯特拉南部海洋热浪的发生情况,以及研究区域内的极端温度。随后,我们进行了耐高温实验,实验包括应激和恢复阶段,在这一阶段,我们将芭蕉藻暴露在四个极端温度(28 °C、30 °C、32 °C、34 °C)和一个有利温度(18 °C)下。我们随后监测了形态和生理反应:主要结果:我们的研究结果表明,几十年来,伊斯特拉海岸南部的MHWs频率、持续时间和强度都在显著增加。实验结果表明,G. barbata在暴露于高达32 °C的温度下后,形态和生理都有可能恢复。然而,暴露在 34 °C的温度下会导致菌丝腐烂,再生能力有限:我们的研究结果表明,鲃鱼对长期暴露于 32 ℃ 以下的极端温度具有显著的适应能力,并表明短期暴露于 32 ℃ 以上的温度(如目前泻湖内的温度)不会对当地鲃鱼的生理或形态产生明显影响。预计未来会有更多的马赫瓦湖,这种适应性强的种群可能是适合伊斯特拉海岸未来恢复活动的重要捐献者。这些结果强调了这一独特种群的恢复能力,同时也警示人们,在快速变化的气候条件下,海洋大型藻类森林很容易受到海水温度升高的影响。
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Effects of extreme temperatures and recovery potential of Gongolaria barbata from a coastal lagoon in the northern Adriatic Sea: an ex situ approach.

Background and aims: Globally, rising seawater temperatures contribute to the regression of marine macroalgal forests. Along the Istrian coastline (northern Adriatic), an isolated population of Gongolaria barbata persists in a coastal lagoon, representing one of the last marine macroalgal forests in the region. Our objective was to examine the impact of extreme temperatures on the morphology and physiology of G. barbata and test its potential for recovery after simulating marine heatwave (MHW) conditions.

Methods: We explored the occurrence of marine heatwaves in southern Istria, adjacent to the study area, in addition to extreme temperatures inside the area itself. Subsequently, we performed a thermotolerance experiment, consisting of a stress and recovery phase, in which we exposed G. barbata thalli to four extreme (28, 30, 32 and 34 °C) and one favourable (18 °C) temperature. We monitored morphological and physiological responses.

Key results: Our findings indicate a significant rise in frequency, duration and intensity of MHWs over decades on the southern Istrian coast. Experimental results show that G. barbata demonstrates potential for both morphological and physiological recovery after exposure to temperatures as high as 32 °C. However, exposure to 34 °C led to thallus decay, with limited ability to regenerate.

Conclusions: Our results show that G. barbata has a remarkable resilience to long-term exposure to extreme temperatures ≤32 °C and suggest that short-term exposure to temperatures beyond this, as currently recorded inside the lagoon, do not notably affect the physiology or morphology of local G. barbata. With more MHWs expected in the future, such an adapted population might represent an important donor suitable for future restoration activities along the Istrian coast. These results emphasize the resilience of this unique population, but also warn of the vulnerability of marine macroalgal forests to rising seawater temperatures in rapidly changing climatic conditions.

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来源期刊
Annals of botany
Annals of botany 生物-植物科学
CiteScore
7.90
自引率
4.80%
发文量
138
审稿时长
3 months
期刊介绍: Annals of Botany is an international plant science journal publishing novel and rigorous research in all areas of plant science. It is published monthly in both electronic and printed forms with at least two extra issues each year that focus on a particular theme in plant biology. The Journal is managed by the Annals of Botany Company, a not-for-profit educational charity established to promote plant science worldwide. The Journal publishes original research papers, invited and submitted review articles, ''Research in Context'' expanding on original work, ''Botanical Briefings'' as short overviews of important topics, and ''Viewpoints'' giving opinions. All papers in each issue are summarized briefly in Content Snapshots , there are topical news items in the Plant Cuttings section and Book Reviews . A rigorous review process ensures that readers are exposed to genuine and novel advances across a wide spectrum of botanical knowledge. All papers aim to advance knowledge and make a difference to our understanding of plant science.
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