一株淡水红藻的形态及分子系统发育研究     

方鵾鹏  南芳茹  冯佳  吕俊平  刘琪  谢树莲 《湖泊科学》2019,31(1):220-235

以采自山西晋祠泉的一株淡水红藻JC1712001为实验材料，对其进行分子系统发育分析和形态特征鉴定，同时利用分子数据对其进行生物地理学研究.结果显示，该株淡水红藻JC1712001与美国、西班牙地区报道的马赫拉熊野藻（Kumanoa mahlacensis Kumano）遗传距离最近，基于rbcL、COI和UPA序列的遗传距离均为0.基于3个序列，利用贝叶斯法、最大似然法和邻接法3种方法构建的系统发育树具有高度一致的系统发育关系，JC1712001均与西班牙及美国地区已报道的马赫拉熊野藻聚为一支，支持率都在97%以上，支持其为马赫拉熊野藻，同时也表明3个基因的高度保守性.形态特征的观察也支持这个结果.马赫拉熊野藻在欧洲、亚洲、北美洲均有分布，RASP软件构建的地理起源图谱显示，欧洲类群地理起源更为古老.马赫拉熊野藻为稀有种，本文的研究结果丰富了我国淡水红藻的分布，为其系统发育和地理起源研究提供了依据.  相似文献   

The Cabo Frio upwelling overrides geographical patterns in the population dynamics of the shrimp Artemesia longinaris Spence Bate, 1888 (Decapoda: Penaeidae)     

Abner Carvalho‐Batista  Joo Alberto Farinelli Pantaleo  Antonio Leo Castilho  Rogrio Caetano da Costa 《Marine Ecology》2019,40(2)

Upwelling areas are among the most productive ecosystems on the planet, influencing the biology of marine organisms. This study investigated the population dynamics of the shrimp Artemesia longinaris in two regions in southeastern Brazil, one inside (Macaé—Rio de Janeiro State) and one outside (Ubatuba—State of São Paulo) the Cabo Frio upwelling area. The aim was to verify the influence of the upwelling phenomenon on the abundance, growth, longevity, size of sexual maturity, and reproductive period of the species. In total, 188,902 individuals were captured at Macaé and 3,461 at Ubatuba. Individuals captured at Macaé showed larger maximum size, higher longevity, and slower growth rate, besides reaching sexual maturity at larger sizes than at Ubatuba. Continuous reproduction was observed in both regions, with juvenile recruitment peaks in spring and summer. Local conditions observed at Macaé were influenced by the Cabo Frio upwelling zone, characterized by productive and cooler waters that are around 20°C during most of the year. The upwelling phenomenon is probably the main factor influencing the population parameters studied here, changing the geographic patterns previously observed for the variation of these parameters in A. longinaris.  相似文献   

A shift in eruption mode of Hekla volcano,Iceland, 3000 years ago: two-coloured Hekla tephra series,characteristics, dispersal and age     

GUDRÚN LARSEN  Bryndís G. Róbertsdóttir  Bergrún A. Óladóttir  JÓN EIRÍKSSON 《第四纪科学杂志》2020,35(1-2):143-154

Hekla volcano is a major producer of large, widespread silicic tephras. About 3000 years ago, the dominant eruption mode shifted from infrequent large (>1 km³) to more frequent moderate (<1 km³) eruptions. In the following two millennia ≥20 explosive silicic-to-intermediate eruptions occurred, and six or more basaltic. Three categories can be identified with dacite/andesite to basaltic andesite in the oldest eruptions through basaltic andesite to basalt in the youngest eruptions. Ten tephra layers of the first category have distinct field characteristics: a pale lower unit and a dark upper unit (two coloured or TC-layers). Colour separation is sharp indicating a stratified magma chamber origin. The lower unit is dominantly andesitic (61–63% SiO₂), while the upper unit is basaltic andesite (53–57% SiO₂). Volumes of the eight largest TC-layers range from 0.2 to 0.7 km³ as freshly fallen. Radiocarbon and soil accumulation rate dates constrain the TC-layers to between 3000 and 2200 years ago. Two of these (~2890 and ~2920 b2k) are likely to occur overseas. Low SiO₂ in the last erupted tephra of the TC-layers is comparable to that of historical Hekla lavas, implying a final effusive phase. The Hekla edifice may, consequently, be younger than 3000 years.  相似文献   

海域地名采集编辑系统的设计与实现   总被引：1，自引：0，他引：1  

张哲  陆毅  高王军  李汉荣  蒋红燕 《海洋测绘》2011,31(6):45-47

针对我国S-57标准电子海图生产中海域地名数据修编存在的手工操作效率低、准确性不高现状,结合海洋测绘生产体系,研究开发海域地名采集编辑系统.系统在可视化显示基础上,实现地名实体数据多边形拓扑构造、编辑、修改,并实现地名属性与图形的双向查询.满足与目前S-57标准电子海图生产系统数据的互通、对接,可提高生产效率和自动化水...  相似文献   

浅论高精度DEM的制作     

陈亚历 《测绘与空间地理信息》2015,(5)

结合地理国情普查DEM精细化生产项目,论述了基于ArcGIS 10.1、ERDAS 2011软件,批量生产高精度DEM的工艺流程及作业过程中关键性技术问题的解决.  相似文献   

基于ArcGIS的MDB数据自动整合方法研究     

刘晓娟  陈少锋  周津津 《测绘与空间地理信息》2015,(7)

以海南1∶50 000 DLG道路数据与地理国情要素道路数据为主要研究对象,利用ArcGIS二次开发平台、Python语言编写脚本,快速实现了二者之间的自动转换,并将此脚本运用到不同要素层,提高了数据整合的工作效率。  相似文献   

基于VR的具有民族地域文化特色的农村小城镇规划设计     

何琳 《测绘与空间地理信息》2015,(5):37-39

利用虚拟现实技术,建立具有不同民族地域文化特色的三维模型和场景,虚拟展示城镇和新农村建设规划设计,从而取代传统的采用沙盘、平面规划图等展示介绍的方法,便于专家和广大民众参与交流。  相似文献   

省级水利地理信息服务平台架构研究     

刘昱君  陶旸 《测绘与空间地理信息》2015,(7):45-46

面向专业应用的地理信息公共服务平台建设,是近年来地理信息服务的重点内容之一。本文以江苏省水利地理信息服务平台建设为例,系统探讨了专业型地理信息服务平台建设的主要设计思路、架构选型和服务接口设计等关键内容。研究期望为各类专业型地理信息公共服务平台建设提供借鉴。  相似文献   

吉林省文物保护管理系统的设计与建立     

薛晓轩  刘子嘉 《测绘与空间地理信息》2015,(11)

文物是不可再生的文化资源,利用先进的测绘技术助力文物保护管理智慧平台的建设,将吉林省文物局现有的文物信息管理平台与地理信息时空数据相挂接,实现文物的查询、属性、分布、统计等功能与地形图相关联,是切实可行的。  相似文献   

《南京市基础测绘成果目录》图册的编制特点     

张颖杰 《测绘与空间地理信息》2015,(8):216-218

概述了《南京市基础测绘成果目录》图册（以下简称《图册》）的编制背景、结构内容及开本与装订方式,较详细地介绍了资料收集整理的方法、地理底图的类型与选取内容、各项专题要素的设计表示的形式与特点。  相似文献