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<p>Invasive macroalgae are recognized as one of the greatest threats to local marine ecology and economy. <i>Chaetomorpha valida</i> is an invasive species in China, originally found in Dalian City, Liaoning Province, and has now invaded southward to seas such as Rongcheng City, Shandong Province. Its overgrowth has seriously damaged the local mariculture industry. Based on two strains of <i>C. valida</i> isolated in our previous study, this study explores the effects of temperature and irradiance on their growth and reproduction under laboratory conditions. The results show that the suitable temperature ranges are primarily 21–29°C. The optimal temperature is 25°C for gametophytic growth and sporophytic asexual reproduction, and 29°C for sporophytic growth and gametophytic sexual reproduction. And there is no significant effect of irradiance on their growth and reproduction. Meanwhile, the suitable temperature ranges and optimum irradiance for the growth and reproduction of both strains are largely similar, with only slight differences in the suitable ones for sporophytic asexual reproduction and gametophytic growth. Accordingly, the effect of temperature on the isomorphic generation alternation in <i>C. valida</i> was analyzed, as well as the dynamics of its generation alternation and invasive potential for its environmental adaptation in the northern and southern seas of China. This will help to understand its dynamic pattern spreading from the north to south in China, and also be an important reference for understanding the generation alternation characteristics, invasions and prevention of the outbreaks of other green tidal algae.</p>

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Temperature characteristics reveal the dynamic pattern of isomorphic generation alternation in the environmental adaptation and invasive potential of the green macroalga, Chaetomorpha valida

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Bingxin Huang,
  • Liming Rao,
  • Yunyan Deng,
  • Boxi Li,
  • Yanguang Zhong,
  • Chang Sun,
  • Meina Chen,
  • Yuan Gao,
  • Lanping Ding

摘要

Invasive macroalgae are recognized as one of the greatest threats to local marine ecology and economy. Chaetomorpha valida is an invasive species in China, originally found in Dalian City, Liaoning Province, and has now invaded southward to seas such as Rongcheng City, Shandong Province. Its overgrowth has seriously damaged the local mariculture industry. Based on two strains of C. valida isolated in our previous study, this study explores the effects of temperature and irradiance on their growth and reproduction under laboratory conditions. The results show that the suitable temperature ranges are primarily 21–29°C. The optimal temperature is 25°C for gametophytic growth and sporophytic asexual reproduction, and 29°C for sporophytic growth and gametophytic sexual reproduction. And there is no significant effect of irradiance on their growth and reproduction. Meanwhile, the suitable temperature ranges and optimum irradiance for the growth and reproduction of both strains are largely similar, with only slight differences in the suitable ones for sporophytic asexual reproduction and gametophytic growth. Accordingly, the effect of temperature on the isomorphic generation alternation in C. valida was analyzed, as well as the dynamics of its generation alternation and invasive potential for its environmental adaptation in the northern and southern seas of China. This will help to understand its dynamic pattern spreading from the north to south in China, and also be an important reference for understanding the generation alternation characteristics, invasions and prevention of the outbreaks of other green tidal algae.