Fábio Nauer, Mariana Cabral Oliveira, E. Plastino, Nair Sumie Yokoya, Mutue Toyota Fujii
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引用次数: 1
摘要
研究温度对生理过程的影响是建立大型藻类生物地理分布模型的必要条件。在巴西沿海(约3.000 km) 3个区系省(热带、过渡型和暖温带)收集到假musciformis四孢子植物,代表3种生态型。分别在20°C、24°C、28°C和32°C条件下培养21 d,分析生长率、光合作用和色素含量等生理参数。假mususciformis标本耐受20°C至32°C的温度变化。然而,所有生态型在32°C时的生理性能均显著下降。我们假设来自热带省的假musciformis生态型已经生活在其热生理极限,仅在冬季(6月至9月)达到最大生长,而温暖温带生态型在夏季(12月至3月)达到最大生长。这种广泛的热最佳可能是这个物种沿着巴西海岸广泛分布的原因,使它能够占据不同的热环境。
Thermal tolerance of Hypnea pseudomusciformis ecotypes (Cystocloniaceae, Rhodophyta) related to different floristic provinces along the Brazilian coast
Studies on the effects of temperature on physiological processes are essential to model macroalgae biogeographic distribution. Tetrasporophytes of Hypnea pseudomusciformis were collected from three floristic provinces (tropical, transition and warm temperate) along the Brazilian coast (~3.000 km), representing three ecotypes. Specimens were cultured under 20°C, 24°C, 28°C and 32°C for 21 days, then physiological parameters (growth rates, photosynthesis and pigments content) were analyzed. H. pseudomusciformis specimens tolerated a temperature variation from 20°C to 32°C. However, all ecotypes displayed a significant decrease in physiological performance at 32°C in all parameters analyzed. We hypothesized that the H. pseudomusciformis ecotype from the tropical province is already living at its thermal physiological limit, reaching its maximum growth only in the winter months (June to September), whereas a warm temperate ecotype reaches maximum growth in the summer months (December to March). This wide thermal optimum may be the reason for the widespread distribution of this species along the Brazilian coast, allowing it to occupy different thermal environments.
期刊介绍:
Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance.
Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.