...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine ecology progress series >Composition of trawl catch fauna off the mouth of the Rio Baluarte, southeastern Gulf of California
【24h】

Composition of trawl catch fauna off the mouth of the Rio Baluarte, southeastern Gulf of California

机译：加利福尼亚东南湾里约热内卢河口附近的拖网捕捞动物组成

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

From April to December 2007, experimental trawls (n = 44, 4 to 22 m depth) were made off the mouth of the Rio Baluarte ecosystem (MRB) and compared to experimental trawls (n = 54, 7 to 40 m) in the adjacent offshore region (AOR) from 2002 to 2007. For both ecosystems, a total of 143 species belonging to 5 phyla were collected. Fishes comprised ca. 80% of the bycatch biomass, while molluscs and echinoderms contributed <20% bycatch. Eight species accounted for 50% of the numerical abundance: the crab Portunus asper (11%), the Panama grunt Pomadasys panamensis (8%), the curvina Stellifer ericymba (7%), the comb sand star Astropecten armatus (6%), the fishes Orthopristis chalceus (6%) and Larimus effulgens (4%), and the crabs Callinectes arcuatus (4%) and Hepatus kossmani (3%). Species with a high or medium survival rate with respect to trawling activity were well represented in the samples, e.g. the crabs C. arcuatus, H. kossmani, and Euphilax robustus, the hermit crab Petrochirus californiensis, and the sea star Luidia brevispina. For the MRB and AOR, the estimated mean biomass was 2.08 and 0.72 t km~(-2), respectively. The population of the blue shrimp Litopenaeus stylirostris and white shrimp L. van-namei was composed of recruits, juveniles, spawners, and old individuals, whereas for grunts it was composed of recruits and juveniles, but rarely old individuals. The high diversity, population structure, and productivity of the studied fauna has positive effects, such as enabling the recruitment for coastal marine fisheries. This is an important reason to protect the river mouth and the adjacent shallow waters.
机译：从2007年4月至2007年12月，从里约Baluarte生态系统（MRB）的口中制造了实验拖网（n = 44，4至22 m深度），并将其与邻近地区的实验拖网（n = 54，7至40 m）进行了比较。 2002年至2007年的近海区域（AOR）。对于这两个生态系统，总共收集了143个物种，属于5个门。鱼约占。 80％的兼捕生物量，而软体动物和棘皮动物贡献的<20％兼捕。八个物种占数量丰富度的50％：螃蟹Portunus asper（11％），巴拿马咕unt Pomadasys panamensis（8％），curvina Stellifer ericymba（7％），梳状沙星Astropecten armatus（6％），鱼类包括Orthopristis chalceus（6％）和Larimus effulgens（4％），以及Callinectes arcuatus（4％）和Hepatus kossmani（3％）的螃蟹。关于拖网活动具有高或中等存活率的物种在样品中得到了很好的体现，例如。蟹C. arcuatus，H。kossmani和Euphilaxrobustus，寄居蟹calitronirus Petrochirus和海洋之星Luidia brevispina。对于MRB和AOR，估计的平均生物量分别为2.08和0.72 t km〜（-2）。蓝色虾对虾和南美白对虾的种群由新兵，少年，产卵者和老者组成，而步兵则由新兵和少年组成，但很少有老者。所研究动物区系的高度多样性，种群结构和生产力具有积极作用，例如能够招募沿海海洋渔业。这是保护河口和附近浅水区的重要原因。

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