• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Symposium on Effects of Fishing Activities on Benthic Habitats--Linking Geology, Biology, Socioeconomics, and Management >Mapping and Characterizing Subtidal Oyster ReefsUsing Acoustic Techniques, Underwater Videography,and Quadrat Counts
【24h】

Mapping and Characterizing Subtidal Oyster ReefsUsing Acoustic Techniques, Underwater Videography,and Quadrat Counts

机译：映射和表征阴性牡蛎reefsusing声学技术，水下摄像性和四边形计数

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Populations of the eastern oyster Crassostrea virginica have been in long-term decline in most areas. A major hindrance to effective oyster management has been lack of a methodology for accurately and economically obtaining data on their distributionand abundance patterns. Here, we describe early results from studies aimed at development of a mapping and monitoring protocol involving acoustic techniques, underwater videography, and destructive sampling (excavated quadrats). Two subtidal reefs in Great Bay, New Hampshire, were mapped with side-scan sonar and with videography by systematically imaging multiple sampling cells in a grid covering the same areas. A single deployment was made in each cell, and a 5-10-s recording was made of a 0.25-m2 area; the location of each image was determined using a differential global position system. A still image was produced for each of the cells and all (n = 40 or 44) were combined into a single photomontage overlaid onto a geo-referenced base map for each reef using Arc View geographic information system. Quadrat (0.25 m2) samples were excavated from 9 or 10 of the imaged areas on each reef, and all live oysters were counted and measured. Intercomparisons of the acoustic, video, and quadrat data suggest: (1) acoustic techniques and systematic videography can readily delimit the boundaries of oyster reefs; (2) systematic videography can yield quantitative data on shell densities and information on reef structure; and (3) some combination of acoustics, systematic videography, and destructive sampling can provide spatially detailed information on oyster reef characteristics.
机译：东牡蛎鲫鱼的人口在大多数地区的长期下降。有效的牡蛎管理的主要障碍缺乏用于准确和经济地获得其分配和丰富模式的数据的方法。在这里，我们描述了旨在开发涉及声学技术，水下摄像性和破坏性采样（挖掘四rats）的映射和监测协议的研究的早期结果。在Great Bay，New Hampshire中的两个阴性珊瑚礁被侧扫声纳映射，并通过系统地成像在覆盖相同区域的网格中的多个采样单元。在每个电池中进行单个部署，并且5-10-S记录由0.25-m2面积制成;使用差分全局位置系统确定每个图像的位置。将静止图像用于每个细胞，将所有（n = 40或44）组合成使用电弧视图地理信息系统的每个Reef覆盖到地理参考的基础图上的单个光电子。将Quadrat（0.25m 2）样品从每个礁上的成像区域的9或10个挖掘出来，所有活牡蛎都被计算并测量。声学，视频和四边数据的离法表明：（1）声学技术和系统摄像机可以容易地分隔牡蛎珊瑚礁的边界; （2）系统摄像机可以在壳体密度和珊瑚礁结构信息上产生定量数据; （3）声学，系统摄像机和破坏性采样的某些组合可以提供关于牡蛎礁特性的空间详细信息。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号