Abstract：
This study delves into how two ecotypes of diatom affect the Pyropia haitanensis, a valuable and commercial red macroalga. We co-cultivated P. haitanensis with a planktonic diatom Skeletonema costatum and benthic diatom Navicula climacospheniae. The results showed that benthic diatom significantly hindered P. haitanensis 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 P. haitanensis growth, pigments, and total protein levels. This study sheds light on the interaction between microalgal ecotypes and commercial macroalga P. haitanensis, which is crucial for its economic significance.
摘要：
这项研究探讨了硅藻的两种生态型如何影响海底草，一种有价值的商业红色大型藻类。我们将海丹与浮游硅藻骨骼和底栖硅藻共同栽培。结果表明，底栖硅藻显著阻碍了海丹的生长，而浮游生物没有重大影响。大型藻类抑制了浮游硅藻的生长，但不影响底栖硅藻。大藻光合色素，除了叶绿素,更高,表明暴露于硅藻时的应力。显微图像显示了致密的底栖硅藻附着，由于光线和EPS分泌有限，可能会对Thalli造成压力。两种硅藻处理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降低。总之,底栖硅藻特别影响了海丹的生长，颜料,和总蛋白质水平。本研究揭示了微藻生态型与商业大型藻类之间的相互作用。这对其经济意义至关重要。
