Noda Hatsuko, Parkinson John Everett, Yang Sung-Yin, Reimer James Davis
Molecular Invertebrate Systematics and Ecology Laboratory, Department of Biology, Chemistry and Marine Sciences, Faculty of Science, University of the Ryukyus, Nishihara, Okinawa, Japan.
Department of Integrative Biology, Oregon State University, Corvallis, OR, USA.
PeerJ. 2017 Oct 3;5:e3740. doi: 10.7717/peerj.3740. eCollection 2017.
Symbiotic dinoflagellates (genus ) shape the responses of their host reef organisms to environmental variability and climate change. To date, the biogeography of has been investigated primarily through phylogenetic analyses of the ribosomal internal transcribed spacer 2 region. Although the marker can approximate species-level diversity, recent work has demonstrated that faster-evolving genes can resolve otherwise hidden species and population lineages, and that this diversity is often distributed over much finer geographical and environmental scales than previously recognized. Here, we use the noncoding region of the chloroplast psbA gene (psbA) to examine genetic diversity among clade C associating with the common reef zoantharian on Okinawa-jima Island, Japan. We identify four closely related psbA lineages including one common generalist and two potential specialists that appear to be associated with particular microhabitats. The sea surface temperature differences that distinguish these habitats are smaller than those usually investigated, suggesting that future biogeographic surveys of should incorporate fine scale environmental information as well as fine scale molecular data to accurately determine species diversity and their distributions.
共生甲藻（属）塑造了其宿主珊瑚礁生物对环境变化和气候变化的反应。迄今为止，主要通过对核糖体内部转录间隔区2区域的系统发育分析来研究的生物地理学。尽管该标记可以近似物种水平的多样性，但最近的研究表明，进化较快的基因可以解析其他隐藏的物种和种群谱系，而且这种多样性通常分布在比以前认识到的更精细的地理和环境尺度上。在这里，我们使用叶绿体psbA基因（psbA）的非编码区域来研究与日本冲绳岛常见的珊瑚虫相关的C类中的遗传多样性。我们鉴定出四个密切相关的psbA谱系，包括一个常见的多面手和两个似乎与特定微生境相关的潜在专家种。区分这些栖息地的海面温度差异比通常研究的要小，这表明未来对的生物地理调查应纳入精细尺度的环境信息以及精细尺度的分子数据，以准确确定物种多样性及其分布。
