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Relative importance and interactive effects of photosynthesis and food in two solar-powered sea slugs

机译：两种太阳能海sea中光合作用和食物的相对重要性和交互作用

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摘要

Sacoglossans use chloroplasts taken from algal food for photosynthesis (kleptoplasty), but the adaptive significance of this phenomenon remains unclear. Two congeneric sacoglossans (Elysia trisinuata and E. atroviridis) were collected in 2009-2011 from Shirahama (33.69°N, 135.34°E) and Mukaishima (34.37°N, 133.22°E), Japan, respectively. They were individually maintained for 16 days under four experimental conditions (combination of light/dark and with/without food), and their survival rate and relative (=final/initial) weights were measured. Both light and food had positive effects on the survival in E. trisinuata, whereas no positive effects of light or food on survival were detected in E. atroviridis. Both light and food had positive effects on relative weights in both species, but light had smaller effects than food. A significant interaction term between light and food was detected in E. trisinuata (but not in E. atroviridis) in that only the presence of both resulted in weight gains. This result suggests that E. trisinuata can obtain sufficient additional energy from photosynthesis for sustaining growth when fresh chloroplasts are continuously supplied from algal food. In addition, fluorescence yield measurements showed that unfed individuals of both E. trisinuata and E. atroviridis lost photosynthetic activity soon (＜4 and 4-8 days, respectively). In conclusion, photosynthesis may function to obtain supplementary nutrition for sustaining growth when food is available in sacoglossans with short-term functional kleptoplasty.
机译：Sacoglossan使用从藻类食物中提取的叶绿体进行光合作用（角膜移植术），但是这种现象的适应性意义仍不清楚。 2009年至2011年，分别从日本的白滨（33.69°N，135.34°E）和Mukaishima（34.37°N，133.22°E）收集了两种同类的角aco（Elysia trisinuata和atroviridis）。将它们分别在四种实验条件下（浅色/深色和有/无食物）组合保持16天，并测量其存活率和相对（最终/初始）重量。光和食物都对三叶埃希氏菌的存活有积极影响，而光和食物对埃特罗弗里迪斯没有检测到正向影响。轻食和食物对这两个物种的相对重量都有积极影响，但轻食比食物对食物的影响要小。在E. trisinuata（但在E. atroviridis中）中检测到了光与食物之间的一个重要的相互作用项，因为只有两者的存在才导致体重增加。该结果表明，当从藻类食物中连续供应新鲜的叶绿体时，三叶草可从光合作用中获得足够的额外能量来维持生长。此外，荧光产量测量结果表明，三食大肠埃希氏菌和黑夜肠埃希氏菌的未饲喂个体很快丧失了光合活性（分别＜4和4-8天）。总而言之，当可在具有短期功能性整形术的舌草中获得食物时，光合作用可能起到获得维持生长所需的补充营养的作用。

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  • 来源
    《Marine biology》 |2014年第5期|1095-1102|共8页
  • 作者

    Ayana Akimoto; Yayoi M. Hirano; Atsushi Sakai; Yoichi Yusa;

  • 作者单位

    Faculty of Science, Nara Women's University, Kitauoya-nishi,Nara 630-8506, Japan;

    Graduate School of Science, Chiba University, 1-33 Yayoi-cho,Inage, Chiba 263-8522, Japan;

    Faculty of Science, Nara Women's University, Kitauoya-nishi,Nara 630-8506, Japan;

    Faculty of Science, Nara Women's University, Kitauoya-nishi,Nara 630-8506, Japan;

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