Macrobenthic Communities of the Eastern Mediterranean Continental Shelf

Abstract. The results of a year long study in which soft-bottom epibenthic invertebrates were collected by grab, dredge and beam-trawl, along the southern Mediterranean coast of Israel, are described in this paper. The classificatory analysis used for both normal and inverse analyses used two measures of dissimilarity - Canberra metric and Bray-Curtis, and both group-average and nearest-neighbour clustering. The results were displayed as dendrograms. Four site groups and five species groups characterised a total of 58 site samples and 245 species. The prominent species in each of the five species groups are mentioned. The applicability of "community concepts" and the effects of sediment properties on community structure are discussed.     

聚类分析成图新方法

常规统计分析软件在聚类分析谱系图的自动成图上,受算法和成图方式局限,成图质量较低,有时出现偏差,程序可读性和可操作性较差,硬件资源占用率偏高.虽前人对此进行了一定的研究,并提出了链式算法,但缺少成图的实施方法.本文运用模块化的软件设计思想,在链式算法的基础上,以循环迭代方式,改善了样品纵向排序方式,并用顺序归并标记的方法提取了谱系图中各线段的顶点数据,大幅简化了谱系图的绘制.解决了用字符代替线段、并类线头无法置中等问题.使得成图在质量、速度上得到了较大的提升,对硬件资源的占用率也大大降低.     

云南腾冲热海热田痕量元素分带研究

对云南省腾冲已知水热活动区及其邻近区域所做地球化学土壤和岩石测量发现痕量元素异常分带模式,范围从25km²逐渐扩大至60km²和200km²。进行相关分析和聚类分析后绘出谱系图。这个分带模式与热液矿床模式酷似,故对其在矿床勘探及贵金属资源方面的潜力给予评价。     

养殖大菱鲆烂鳍病病原菌的鉴定及系统发育学研究

从山东半岛3个养殖场各分离到一株大菱鲆烂鳍病的病原菌,均为革兰氏阴性,短杆状,极生鞭毛,有运动能力,菌落半透明。经常规生理生化特征测试和16SrRNA基因序列对比,表明它们都是同一种细菌。理化特征的结果显示这3株菌均与V．anguillarum的表性特征非常相似。对其16SrRNA基因序列进行分析,并构建了系统发育树,结果表明这些菌株与V．anguillarum亲缘关系最近。综合上述研究结果,将该菌鉴定为V．anguillarum.     

Individual Movement - Sequence Analysis Method (IM-SAM): characterizing spatio-temporal patterns of animal habitat use across landscapes

ABSTRACT

We present methodological advances to a recently developed framework to study sequential habitat use by animals using a visually-explicit and tree-based Sequence Analysis Method (SAM), derived from molecular biology and more recently used in time geography. Habitat use sequences are expressed as annotations obtained by intersecting GPS movement trajectories with environmental layers. Here, we develop IM-SAM, where we use the individual reference area of use as the reference spatial context. To assess IM-SAM’s applicability, we investigated the sequential use of open and closed habitats across multiple European roe deer populations ranging in landscapes with contrasting structure. Starting from simulated sequences based on a mechanistic movement model, we found that different sequential patterns of habitat use were distinguished as separate, robust clusters, with less variable cluster size when habitats were present in equal proportions within the individual reference area of use. Application on real roe deer sequences showed that our approach effectively captured variation in spatio-temporal patterns of sequential habitat use, and provided evidence for important behavioral processes, such as day-night habitat alternation. By characterizing sequential habitat use patterns of animals, we may better evaluate the temporal trade-offs in animal habitat use and how they are affected by changes in landscapes.     

利用凝聚层次聚类的多视影像重建算法

无序多视影像的三维重建由于缺乏先验信息而可能导致重建结果发生漂移。提出一种稳健的重建算法,以匹配点对数量作为影像间的相似性量度,利用层次聚类算法对影像集进行分层分组,通过自下而上的顺序,对各层中的每一组子影像集进行重建;然后利用公共点将相邻子影像集间的重建结果进行融合,直到完成整个影像集的重建。最后通过3组具有代表性的影像集的重建试验,验证了算法的有效性。