我校生命科学学院两名研究生应邀参加国际学术会议

2005年10月15日至29日，我校生命科学学院硕士研究生赵大鹏应美国迪斯尼动物园邀请、资助，赴奥兰多市参加“动物调查方法研究”国际讨论会。会议主要探讨应用最新的统计分析软件评估、测量物种的丰富度，确定野生动物种群中动物个体的数量。赵大鹏作为亚洲惟一代表，并在大会上作了“秦岭金丝猴交配行为的观察”报告，获得了美国佛罗里达大学Anne Savage教授的好评，双方就研究领域内的许多学术问题进行了交流探讨。     

天宝生态公路对沿线生态景观格局可能的影响

文章以生态学的视角，用系统论原理、对公路生态影响的空间概念模型初步做了营造。对即将开工建设的天水到宝鸡生态高速公路通过“生态公路系统、路基通透度、种群缩小、和公路生态影响区的轮廓”等较新的“道路生态”新概念提出了天宝高速公路在生态恢复的过程中要关注的几个内容。     

硇洲岛沿海双壳类的种类组成和生态分布

本文报道了广东湛江硇洲岛沿海的双类软件动物９２种，隶属５４属２０科；介绍了硇洲岛的自然环境及潮汐；对双壳类的种类组成，生态分布，优势种和区系特点等进行了分析。     

粘虫（Mythimna Separata实验种群生殖力表的研究

本文以粘虫为实验材料,在3个温度和同一相对湿度条件下,组建了粘虫实验种群生殖力表。应用3种方法分别求得各统计量的值如下。 内禀增长能力:18℃下为0.0668/每日;25℃下为0.1256/每日;30℃下为0.1272/每日。 周限增长率:18℃下为1.069/每日;25℃下为1.135/每日;30℃下为1.136/每日。 净增殖率:18℃下为309.792/每日,25℃下为319.876/每日;30℃下为134.211/每日。     

匹配于进化种群的局部网络图度量

为了分析匹配于进化种群的贝叶斯网络结构 ,给出了用于刻画局部贝叶斯网络度量的有关表示。依据贝叶斯狄利克雷度量 ,对于贝叶斯网络图中的 3个顶点 (对应于染色体的某 3个基因位置 ) ,研究了 3个顶点无连接、其中只有两个顶点存在有向连接、及 3个顶点存在两条有向边时的度量值关系。揭示了局部贝叶斯网络结构的固有特性 ,为进一步研究进化算法的种群结构提供了一条可行的途径。     

Spatial and temporal variations of zooplankton composition and quantity distribution in the upper waters around Nansha Islands

This study aims to examine spatial and temporal variations of zooplankton species composition, density and biomass distribution and community structure, based on the data obtained from three separate cruises carded out in November 1997, April and July 1999. Results show that 244 species of zooplankton and 8 groups of planktonic larvae were identified, which were dominated by copepods, followed by amphipods, ostracods and medusae. The total species were 201 and 198 for the cruises of November 1997 and July 1999, respectively, and no obvious seasonal variation of species richness was observed. The distribution of zooplankton species richness decreased from pelagic to coastal waters. Average richness of species in each station was higher in the cruises of November 1997（62） and April 1999（61） than in the cruise in July 1999 （56）, which was mainly a result from the pelagic or coastal water mass movement made by the monsoon. Zooplankton in the upper waters （0--100 m） around Nansha Islands belonged to the typical tropic pelagic fauna, most of them were pelagic warm-water species, followed by coastal warm-water species and euryhaline warm-water species. The number of dominant species ranged from 5 to 7 in each cruise. No obvious seasonal succession of dominant species was ob- served. Sagitta enflata, Cypridina narni, Cosmocalanus darwinii, Pleuromamma gracilis and Echino-pluteus larva were the main dominant species. The average of zooplankton biomass and density in three cruises were 31, 32, 28 mg·m^-3 and 31, 39, 35 ind·m^-3, respectively. Copepods were the most abundant, followed by chaetognaths. Zooplankton high biomass distributed mainly in the northwestern waters around Nansha Islands, and generally occurred in the areas of oceanic front and upweUing. The main reason for zooplankton quantity without obvious seasonal variation was the relative steady temperature dynamics in the waters around Nansha Islands.     

草的蝗虫种群数量消长数学模型研究

本文根据草地蝗虫发生特点，在充分考虑其数量消长受环境条件、敌害及本身内禀作用制约的基础上，提出了以时序为特点的几种主要蝗虫及混虫种群数量消长的数学模型。宽须蚁蝗、狭翅雏蝗及混合种群密度的拟合模型中ｚ和ｘ有较强的相关性，故这几个模型较好的反映了消长情况。但在混合种群消长模型中，自９月１５日以后观测值迅速下降，而模型值并未很快下降，这是由于模型未考虑蝗虫生存的临界温度。