Seasonal succession of zooplankton species composition and dominant species in the Daya Bay,northern South China Sea

为全面掌握南海北部大亚湾海域浮游动物的群落特征。利用2007—2008年在大亚湾开展的4个航次124个站次的海洋生物调查数据和历史资料,通过数据统计分析,对浮游动物种类组成和优势种进行研究,结果表明:(1)大亚湾浮游动物种类组成的季节变化明显、种类更替频繁;(2)优势种组成简单,季节变化明显,单一种的优势地位显著。与过去相比,大亚湾海域浮游动物群落的组成基本稳定,但种类和优势种的更替率均呈现逐步增大的趋势,浮游动物优势种组成趋于简单、单一种优势地位明显提高。大亚湾生态环境随季节的变幅增强,群落的稳定性明显下降。海水温度的升高,改变了大亚湾暖水性浮游动物种类的生活周期;而且营养水平的提高也促使赤潮种类夜光虫数量的增加。To understand the characteristics of zooplankton community in the Daya Bay comprehensively,the zooplankton species composition and dominant species in the Daya Bay were studied based on 124 samples collected from seasonal surveys conducted in December 2007 and March,May,and September 2008.A total number of 284 zooplankton species were recorded in the surveys.We found large seasonal changes in zooplankton composition with an average ratio of 62.3% of species seasonal subrogation.We also found that there were apparent dominant species and the dominant species changed greatly between seasons.The clear seasonal succession of zooplankton composition and dominant species was a reflection of the increased amplitude of seasonal variations in environmental conditions in the Daya Bay.Compared with past records,the seasonal subrogation ratio of zooplankton species has been increased,the dominant species changed from Copepoda to Protista,and their dominance became higher.This indicates that the stability of zooplankton community has been reduced.The increased water temperature in the Daya Bay has changed the life cycle of the warm-water zooplanktons.Because of the increased nutrient levels in the Daya Bay,the dominance of the red-tide species of Noctiluca miliaris has been greatly increased,especially in winter and spring when the water temperature is relatively low.广东省科技计划项目(2009B030600002); 中央级公益性科研院所基本科研业务费专项基金(2007ZD08;2010YD10;2009TS08;2012TS02

基于桑格测序法建立高鼻羚羊鉴定方法的可行性研究

为有效鉴定高鼻羚羊（Saiga tatarica）源性成分，基于细胞色素c氧化酶亚型Ⅰ基因设计特异性引物对高鼻羚羊角、高鼻羚羊角粉，以及与其种属相近或形态学相似的动物角和动物组织的DNA进行PCR扩增，对扩增产物进行桑格测序和序列分析，并对高鼻羚羊的物种分类问题进行探讨。结果表明：所有对照样品均未见扩增条带，阳性样品与NCBI基因数据库参考序列的相似性均大于99.42%，说明桑格测序法能准确鉴定高鼻羚羊成分，但由于证据不足，无法明确该方法能否进一步区分高鼻羚羊与蒙古高鼻羚羊（S.t.mongolica）

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements