...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ICES Journal of Marine Science >Patterns of larval-stage connectivity of Atlantic cod (Gadus morhua) within the Gulf of Maine in relation to current structure and a proposed fisheries closure
【24h】

Patterns of larval-stage connectivity of Atlantic cod (Gadus morhua) within the Gulf of Maine in relation to current structure and a proposed fisheries closure

机译：缅因湾内大西洋鳕（Gadus morhua）幼体阶段连通性的模式与当前结构和拟议的渔业关闭的关系

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

The decline of the Atlantic cod, Gadus morhua, stock in the Gulf of Maine to a historically low biomass has been coupled with a severe contraction in spatial range. The stock is now largely concentrated in the western Gulf of Maine. This erosion of spatial stock structure may be a factor-inhibiting recovery of Gulf of Maine cod. However, recent efforts to rebuild anadromous forage fish in the coastal Maine region coupled with the proposed creation of a new Eastern Maine Closed Area (EMCA), sited where localized depletion of the cod stock has been especially severe, might enable reestablishment of lost spatial structure of Gulf of Maine cod. We carried out larval transport modeling to examine the potential benefit of recovered cod spawning in the EMCA through supplying larvae to suitable juvenile settlement areas in the Gulf of Maine coastal zone and in the Cashes Ledge Closed Area (CLCA) in the central Gulf of Maine. The results indicate that an appreciable fraction of the larvae spawned in the EMCA are retained, to an age of settlement capability, in the coastal Maine region. Spawning in the EMCA may thus be a contributor of juveniles to a local, eastern Gulf of Maine, cod sub-stock. The results further indicate that spawning in the EMCA may supply a substantial subsidy of larvae to suitable juvenile habitat in the western Gulf of Maine and the CLCA. Protection of spawning stock in the EMCA may thus provide demographic benefits for the wider Gulf of Maine cod stock. Patterns of larval-stage connectivity between various potential spawning regions (including the EMCA) and areas of suitable juvenile habitat exhibit considerable interannual variability, which is predominantly linked to variability in the large-scale Gulf of Maine circulation. This result underscores the value of spatially explicit management as a means of fostering the recovery of the Gulf of Maine cod stock.
机译：缅因湾的大西洋鳕鱼Gadus morhua数量下降至历史最低的生物量，再加上空间范围上的严重收缩。现在的库存主要集中在缅因州西部的海湾。空间种群结构的这种侵蚀可能是阻碍缅因鳕鱼湾恢复的因素。但是，最近在缅因州沿海地区重建无食性饲用鱼的努力，加上提议的建立新的缅因州东部禁猎区（EMCA）的提议，该地区的鳕鱼种群局部耗竭特别严重，这可能使失去的空间结构得以重建缅因州鳕鱼湾。我们进行了幼虫运输模型，通过向缅因州海湾沿岸地区和缅因州中部的Cashes Ledge禁区（CLCA）的适当少年定居点供应幼虫，来研究EMCA中回收的鳕鱼产卵的潜在利益。结果表明，在缅因州沿海地区，EMCA中产生的幼虫中有相当一部分被保留到一定的定殖能力。因此，EMCA中的产卵可能是缅因州东部东部鳕鱼子种群中幼鱼的诱因。结果进一步表明，EMCA中的产卵可为缅因州西部和CLCA的适当少年栖息地提供大量的幼体补贴。保护EMCA中的产卵种群可能因此为缅因湾鳕鱼种群的广泛提供人口优势。各种潜在产卵区域（包括EMCA）与适当的少年栖息地区域之间的幼虫阶段连通性模式表现出很大的年际变化，这主要与缅因湾大环流的变化有关。这一结果强调了空间明确管理作为促进缅因湾鳕鱼种群恢复的一种手段的价值。

著录项

相似文献

  • 外文文献
  • 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