Seasonal and inter‐annual variability in the heatwave tolerance of the kelp Saccharina latissima (Laminariales, Phaeophyceae)

IF 1.6 4区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Phycological Research Pub Date : 2022-09-14 DOI:10.1111/pre.12501

Sarina Niedzwiedz, N. Diehl, P. Fischer, K. Bischof

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引用次数: 1

Abstract

The geographical distribution of organisms, such as the foundation kelp species Saccharina latissima, is mainly driven by temperature. Globally increasing sea surface temperature and further intensification of marine heatwaves have already resulted in local extinction of kelp populations worldwide. In the present study, we investigated temporal variation in the thermal susceptibility of S. latissima by assessing stress responses of field sporophytes sampled from Helgoland (German Bight) in June 2018, August 2018 and August 2019 in heatwave scenarios. We analyzed survival, growth, maximum quantum yield of photosystem II (Fv/Fm) and pigment composition. Survival decreased with increasing environmental and experimental temperatures. Growth revealed seasonal patterns, being higher in June than in August, whereas Fv/Fm decreased with increasing temperature, independent of the sampling time. We found an increase in the concentration of light harvesting pigments and in the de‐epoxidation state of the xanthophyll cycle with higher treatment temperature. This pattern was even more pronounced at higher environmental temperature prior to the experiment (June 2018 < August 2019 < August 2018). Our results show that the thermal tolerance of S. latissima towards heatwaves in summer is significantly affected by the environmental history it previously experienced.

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海带Saccharina latissima(海带科)耐热性的季节和年际变化

基带(Saccharina latissima)等生物的地理分布主要受温度驱动。全球海平面温度的上升和海洋热浪的进一步加剧已经导致了全球海带种群的局部灭绝。本研究通过评估2018年6月、2018年8月和2019年8月德国黑尔戈兰(Helgoland)野外孢子体在热浪情景下的胁迫响应，研究了黑穗草(S. latisima)热敏感性的时间变化。我们分析了光系统II的存活、生长、最大量子产率(Fv/Fm)和色素组成。存活率随环境温度和实验温度的升高而降低。生长表现出季节性特征，6月高于8月，而Fv/Fm随温度升高而降低，与采样时间无关。我们发现，随着处理温度的升高，光收获色素的浓度增加，叶黄素循环的去环氧化状态也增加。在实验前较高的环境温度下(2018年6月< 2019年8月< 2018年8月)，这种模式更为明显。结果表明，柽柳对夏季热浪的耐热性受其所经历的环境历史的显著影响。

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

Phycological Research 生物-海洋与淡水生物学

CiteScore

3.60

自引率

13.30%

发文量

审稿时长

>12 weeks

期刊介绍： Phycological Research is published by the Japanese Society of Phycology and complements the Japanese Journal of Phycology. The Journal publishes international, basic or applied, peer-reviewed research dealing with all aspects of phycology including ecology, taxonomy and phylogeny, evolution, genetics, molecular biology, biochemistry, cell biology, morphology, physiology, new techniques to facilitate the international exchange of results. All articles are peer-reviewed by at least two researchers expert in the filed of the submitted paper. Phycological Research has been credited by the International Association for Plant Taxonomy for the purpose of registration of new non-vascular plant names (including fossils).