Grazer‐induced changes on mechanical properties of diatoms frustule: A new proof for a watery arms race

IF 5.1 2区地球科学 Q1 LIMNOLOGY

Limnology and Oceanography Letters Pub Date : 2024-07-01 DOI:10.1002/lol2.10419

Huo Xu, Fengyuan Chen, Xiaodong Zhang, Zhen Zhang, Ke Pan, Hongbin Liu

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引用次数: 0

Abstract

We investigated changes in physiology and mechanical properties of diatoms exposed to chemical cues released by copepods Pseudodiaptomus annandalei. Our results showed that the diatoms Phaeodactylum tricornutum, Cylindrotheca closterium, Thalassiosira weissflogii, and Amphora coffeaeformis exhibited elevated growth rates and a substantial 2‐ to 50‐fold increase in biogenic silica (BSi) content increase when exposed to the chemical cues except for Cyclotella sp. Atomic force microscopy and X‐ray photoelectron spectroscopy analyses revealed that diatom frustules exhibited a remarkable 3‐ to 10‐fold increase in modulus and a substantial 2‐ to 5‐fold increase in hardness when they received grazing signals. The increase in the proportion of condensed silicon in the frustules could be the major reason for the more mechanically robust cells. Our results indicate that diatoms simultaneously increase their growth rate and robustness when exposed to copepod chemical cues. This study at the nanoscale enhanced our understanding of how diatoms respond to zooplankton predation in marine ecosystems.

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噬菌体诱发的硅藻嵴椎机械特性变化：水中军备竞赛的新证据

我们研究了硅藻在桡足类黄腹假桡足类（Pseudodiaptomus annandalei）释放的化学线索作用下的生理和机械特性变化。结果表明，硅藻 Phaeodactylum tricornutum、Cylindrotheca closterium、Thalassiosira weissflogii 和 Amphora coffeaeformis 在暴露于化学线索时，生长速度加快，生物硅（BSi）含量大幅增加 2 到 50 倍，但 Cyclotella sp.原子力显微镜和 X 射线光电子能谱分析表明，硅藻在接受放牧信号时，其挫折模量显著增加 3 至 10 倍，硬度大幅增加 2 至 5 倍。硅藻块根中凝结硅比例的增加可能是细胞具有更强机械强度的主要原因。我们的研究结果表明，硅藻在受到桡足类化学线索的影响时，其生长速度和稳健性会同时提高。这项纳米尺度的研究加深了我们对海洋生态系统中硅藻如何应对浮游动物捕食的理解。

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

Limnology and Oceanography Letters Multiple-

CiteScore

10.00

自引率

3.80%

发文量

审稿时长

25 weeks

期刊介绍： Limnology and Oceanography Letters (LO-Letters) serves as a platform for communicating the latest innovative and trend-setting research in the aquatic sciences. Manuscripts submitted to LO-Letters are expected to present high-impact, cutting-edge results, discoveries, or conceptual developments across all areas of limnology and oceanography, including their integration. Selection criteria for manuscripts include their broad relevance to the field, strong empirical and conceptual foundations, succinct and elegant conclusions, and potential to advance knowledge in aquatic sciences.