This study delves into how two ecotypes of diatom affect the , a valuable and commercial red macroalga. We co-cultivated with a planktonic diatom and benthic diatom . The results showed that benthic diatom significantly hindered growth, while planktonic ones had no major impact. The macroalga restrained planktonic diatom growth but did not affect benthic diatom. Photosynthetic pigments of macroalga, except chlorophyll, were higher, indicating stress when exposed to diatoms. Microscopic images revealed dense benthic diatom attachment, potentially stressing thalli due to limited light and EPS secretion. Total carbohydrate slightly decreased in both diatom treatments, while total protein significantly decreased with increasing benthic diatom densities. In summary, benthic diatom notably influenced growth, pigments, and total protein levels. This study sheds light on the interaction between microalgal ecotypes and commercial macroalga , which is crucial for its economic significance.

中文翻译：

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底栖和浮游硅藻对商业大型藻坛紫菜生长和生化成分的影响

这项研究深入探讨了硅藻的两种生态型如何影响一种有价值的商业红藻。我们与浮游硅藻和底栖硅藻共同培养。结果表明，底栖硅藻显着阻碍生长，而浮游硅藻则没有重大影响。大型藻类抑制了浮游硅藻的生长，但不影响底栖硅藻。除叶绿素外，大型藻类的光合色素较高，表明暴露于硅藻时存在应激。显微图像显示密集的底栖硅藻附着，由于光线和 EPS 分泌有限，可能会对菌体造成压力。两种硅藻处理中的总碳水化合物略有下降，而总蛋白质随着底栖硅藻密度的增加而显着下降。总之，底栖硅藻显着影响生长、色素和总蛋白质水平。这项研究揭示了微藻生态型和商业大型藻类之间的相互作用，这对其经济意义至关重要。