New observations on the corallivorous nudibranch Phestilla melanobrachia: morphology, dietary spectrum and early development

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-09-11 DOI:10.1093/mollus/eyab034

Sam King Fung Yiu, Sheena Suet-Wah Chung, Jian-Wen Qiu

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Abstract

Phestilla melanobrachia is a coral-eating nudibranch widely distributed in the tropical Pacific. Previous studies have revealed only two colour morphs of P. melanobrachia, an orange form preying on various orange Dendrophyllia and Tubastraea spp. and a dark green form preying on the black Tubastraea micrantha and Tubastraea diaphana. Both colour morphs live in relatively deep waters (15–25 m) of exposed shores. We conducted morphological and molecular analysis, which revealed a beige colour morph of P. melanobrachia that feeds on the hermatypic scleractinian coral Turbinaria peltata in shallow waters (<10 m). The three genera of corals all belong to the family Dendrophylliidae, but Dendrophyllia and Tubastraea are azooxanthellates whereas Turbinaria is zooxanthellate. Consistent with their diet, the beige colour morph has a high abundance of dinoflagellate cells in the ceratal tips, whereas the other two colour morphs contain only few or no dinoflagellate cells in their cerata. Our finding of this new colour morph extends the knowledge about the diet, ecological niche and potential ecological impact of this species of corallivorous nudibranch.

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珊瑚食性裸鳃鱼的新观察:形态、食性谱和早期发育

黑臂弯虫是一种广泛分布于热带太平洋的以珊瑚为食的裸鳃动物。先前的研究只揭示了黑尾蕨的两种颜色变种，一种是橙色的，捕食各种橙色的树蕨和管状蕨，另一种是深绿色的，捕食黑色的薇兰管状蕨和小管状蕨。这两种颜色的变种都生活在相对较深的水域(15-25米)。我们进行了形态学和分子分析，发现P. melanobrachia在浅水(<10 m)中以雌雄同体的硬核珊瑚Turbinaria peltata为食，呈米黄色形态。这三属珊瑚都属于树突珊瑚科，但树突珊瑚和Tubastraea是偶黄质珊瑚，而Turbinaria是虫黄质珊瑚。与它们的饮食一致，米黄色形态的甲壳尖端有大量的甲壳鞭毛细胞，而其他两种颜色形态的甲壳中只有很少或没有甲壳鞭毛细胞。我们对这种新的颜色形态的发现扩展了对这种珊瑚食性裸鳃动物的饮食、生态位和潜在生态影响的认识。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

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.