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Productivity and thallus toughness trade‐off relationship in marine macroalgae from the Japan Sea
Phycological Research ( IF 1.5 ) Pub Date : 2019-04-02 , DOI: 10.1111/pre.12375
Yoshihiko Sakanishi 1 , Hiromi Kasai 2 , Koichiro Enomoto 3 , Masashi Toda 4 , Jiro Tanaka 5
Affiliation  

Trade‐offs are considered key to understanding mechanisms supporting the coexistence of multiple plant species. Thus, understanding the mechanisms underlying trade‐offs is expected to contribute to conservation and management of macroalgal beds composed of diverse macroalgae of rocky shore ecosystems. To test the occurrence of trade‐offs between productivity and thallus toughness as well as pair‐wise thallus trait relationships that are expected to indirectly relate to any trade‐offs, traits and relationships for 13 species of macroalgae from the central area along the Japan Sea coast of Honshu, Japan were examined. In each species we examined for photosynthetic capacity per unit biomass (as Amass) and nitrogen (i.e., photosynthetic nitrogen‐use efficiency, PNUE), nitrogen content (as Nmass), thallus mass per unit thallus area (as TMA) and force required to penetrate the thallus (as Fp, a common index of leaf toughness in land plants by punch test). A significant negative correlation indicating a trade‐off between productivity and thallus toughness was found between Amass or PNUE and Fp. Pair‐wise relationships that were expected to indirectly relate to the trade‐off were as follows. Amass was positively correlated with Nmass. Thalli with high Nmass extensively utilizing nitrogen in the photosynthetic parts, and consequently exhibiting elevated metabolic rates. Moreover, thalli with high Nmass tended to be associated with low TMA, and Nmass decreased with increasing TMA. A significant negative correlation was observed between TMA and Amass or PNUE because of the linkage of high Amass or PNUE with high Nmass and high Nmass associated with low TMA, while a significant positive correlation was observed between TMA and Fp. The two correlations indicate a physiological and structural trade‐off, which underlies the interdependency of thallus traits. Results of multivariate analyses also indicated that the thallus traits interdependently vary across a single axis based on the trade‐off.

中文翻译:

日本海海洋大型藻类的生产力和叶绿体韧性权衡关系

权衡被认为是理解支持多种植物物种共存的机制的关键。因此,了解权衡背后的机制有望有助于保护和管理由岩石海岸生态系统的各种大型藻类组成的大型藻床。测试生产力和叶绿体韧性之间的权衡以及成对的叶绿体性状关系的发生,这些关系预计与来自日本海中部地区的 13 种大型藻类的任何权衡、性状和关系间接相关日本本州海岸进行了考察。在每个物种中,我们检查了每单位生物量的光合能力(作为 Amass)和氮(即光合氮利用效率,PNUE)、氮含量(作为 Nmass)、每单位菌体面积的菌体质量(作为 TMA)和穿透菌体所需的力(作为 Fp,通过冲压试验测定陆地植物叶片韧性的常用指标)。在 Amass 或 PNUE 和 Fp 之间发现了显着的负相关,表明生产力和叶绿体韧性之间存在权衡。预计与权衡间接相关的成对关系如下。Amass 与 Nmass 呈正相关。具有高 Nmass 的菌体在光合部分广泛利用氮,因此表现出较高的代谢率。此外,具有高 Nmass 的菌体往往与低 TMA 相关,并且 Nmass 随着 TMA 的增加而降低。由于高 Amass 或 PNUE 与高 Nmass 和高 Nmass 与低 TMA 相关联,因此在 TMA 和 Amass 或 PNUE 之间观察到显着的负相关,而在 TMA 和 Fp 之间观察到显着的正相关。这两种相关性表明了生理和结构的权衡,这是叶状体性状相互依赖的基础。多变量分析的结果还表明,基于权衡,菌体性状在单个轴上相互依赖地变化。
更新日期:2019-04-02
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