Spatiotemporal variations of benthic macrofaunal community in the Xiamen Amphioxus Nature Reserve, eastern South China Sea

In order to realize the spatiotemporal variations of benthic macrofaunal communities at the"Amphioxus Sand"habitat,six surveys including four seasons and three consecutive summers(i.e.,2014,2015 and 2016)were conducted in two core sites,i.e.,Huangcuo(HC)and Nanxian-Shibaxian(NX),in the Xiamen Amphioxus Nature Reserve in China.A total of 155 species of macrofauna were recorded,therein,polychaetes were dominant in terms of species number and density.Significant spatiotemporal variations of macrofaunal communities were observed.The density of polychaetes and the biomass of molluscs in the HC site were higher than those in the NX site.Macrofauna were more diverse and abundant in the cold seasons(winter and spring)than that in the warm seasons(summer and autumn).The annual variations of macrofaunal communities may be attributed to the changes in sediment texture among the three years of the survey.The variations in macrofaunal communities were mainly related to the proportion of polychaetes within the community.In addition,the density of amphioxus(include Branchiostoma japonicum and B.belcheri)was negatively correlated to that of polychaetes,bivalves,and crustaceans.Amphioxus was less likely to be found in the sediments with higher silt and clay content.Five biotic indices including Margaref’s richness index(d),Peilou’s evenness index(J′),Shannon-Wiener diversity index(H′),AMBI and M-AMBI were calculated in the present study.AMBI seems suitable in assessing benthic health at the"Amphioxus Sand"habitat,and a potential risk of ecological health in Xiamen Amphioxus Nature Reserve should be aware.

Multivariate analysis of serum surface-enhanced Raman spectroscopy of liver cancer patients

Early diagnosis of liver cancer plays a significant role in reducing its high mortality.In this preliminary study,the feasibility of using serum surface-enhanced Raman spectroscopy(SERS)to identify liver cancer was studied.Serum samples were obtained from liver cancer patients and healthy controls.The differences between the SERS spectra of pre-operation and postoperation of liver cancer patients were also analyzed.The general shape and trend of SERS spectra of health control and liver cancer patients were similar.Multivariate analysis,e.g.,PLSSVM,might be useful for the discrimination of serum SERS spectra of pre-operation and post-operation.

中国海域多毛类环节动物物种多样性研究进展

多毛类环节动物是海洋底栖生物群落的重要类群之一,在海洋生物监测、海水养殖、底栖食物链网、生态评估和生态修复中起着重要的作用。本文根据我国学者首篇记述中国海域多毛类物种文献、首次发表新种文献和首篇博士论文的年份,将中国海域多毛类环节动物物种多样性研究分为3个阶段。第一阶段(1933–1961年)我国学者尚未发现新种,但记述了几十种多毛类;第二阶段(1962–2007年)发现了49新种,但没有专门的博士和硕士学位论文;第三阶段(2008–2022年)发现了120新种,有博士和硕士学位论文。从1933年至2022年,我国学者发现的新种和新记录种数量呈上升趋势,但在不同时间段,特别是在第二阶段有较大波动。目前,我国多毛类物种多样性研究存在一些科、属、种的分类地位存疑,一些科、属的分类亟待研究,一些新种未被世界海洋物种目录(World Register of Marine Species)接受等问题。鉴于存在的问题,本文建议在我国加强多毛类数据库建设,加强多毛类物种多样性、遗传多样性和环境DNA研究。