“近空间飞行器的关键基础科学问题”重大研究计划2009年度学术交流会介绍

<正>2010年1月9～10日,近空间飞行器的关键基础科学问题重大研究计划2009年度学术交流会在北京市昌平区召开.参加会议的有该重大研究计划学术指导专家组、秘书组和管理工作组的成员,项目负责人和部分项目组成员,共计150余人.

Ulva diversity in the Yellow Sea during the large-scale green algal blooms in 2008-2009

P>In the Yellow Sea of China, large-scale green tides have broken out for three consecutive years from 2007 to 2009. As part of the efforts to localize the algal source, two cruises were conducted in the early stage and the outbreak stage of the bloom in 2009. We analyzed the morphological and genetic diversity of drifting Ulva specimens and culture-derived isolates from seawater sampled in different localities. For phylogenetic analyses, the nuclear encoded ribosomal DNA internal transcribed spacer region (ITS nrDNA) and the plastid encoded large subunit of ribulose-1, 5-bisphosphate carboxylase/oxgenase gene (rbcL) were used. Our molecular and morphological data indicate that the dominant free-floating Ulva species in 2008 and 2009 possibly belonged to a single strain of the U. linza-procera-prolifera (LPP) clade. The ITS sequences from bloom-forming algal samples with dense branches were identical to those from U. linza-like specimens without branches derived from the Yellow Sea. Microscopic individuals of the dominant Ulva strain were detected in eight stations, revealing that spore dispersal in the water helped to enlarge biomass in the water during the outbreak stage of green tide in the Yellow Sea.

南美白对虾（Penaeus vannamei Boone,1931)卵子质量的形态学评估

1）本文描述了南美白对虾正常的卵子形态及发生特点，以及受精卵和非受精卵的形态学鉴别方法。2）从生产的角度出发提出了评估卵子质量的五项指标：同批卵子规格的一致程度，卵子的沉降速度，孵化膜的抗变形能力，4－8细胞期的分裂特点，扩膜卵在同批卵中所占的比例。除此外，对于亲虾持续产卵与所产卵子质量的关系等也作了相应的探讨。