• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>San Francisco Estuary and Watershed Science >Variation of Fish Habitat and Extent of the Low-Salinity Zone with Freshwater Flow in the San Francisco Estuary
【24h】

Variation of Fish Habitat and Extent of the Low-Salinity Zone with Freshwater Flow in the San Francisco Estuary

机译：旧金山河口鱼类栖息地的变化以及低盐度带的淡水流量变化

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

摘要

We used the UnTRIM San Francisco Bay–Delta hydrodynamic model to examine the spatial distribution of salinity as a function of freshwater flow in the San Francisco Estuary. Our particular focus was the covariation of flow with the spatial extent of the low-salinity zone (LSZ: salinity = 0.5 to 6), and with the extent of habitat for common species of -nekton as defined by their salinity ranges. The UnTRIM model has an unstructured grid which allowed us to refine earlier estimates of the availability of suitable salinity ranges, particularly for species resident in low salinity. The response of the salinity field to flow was influenced by the bathymetry of the estuary. Area and volume of the LSZ were bimodal with X2, the distance up the axis of the estuary to a near-bottom salinity of 2, roughly the middle of the LSZ. The smallest area and volume occurred when the LSZ was in the Delta or Carquinez Strait, moderate values when it was in Suisun Bay, and the highest values when it was in broad, shallow San Pablo Bay. Resource selection functions for the distributions of common nekton species in salinity space were up-dated from previous values and used to calculate salinity-based habitat indices using the UnTRIM results. These indices generally increased with decreasing X2 (increasing flow), but the slopes of these relationships were mostly inconsistent with corresponding relationships of abundance to flow. Thus, although the salinity range used by most nekton expands as flow increases, other mechanisms relating population size to flow are likely more important than the physical extent of suitable salinity.
机译：我们使用UnTRIM旧金山湾三角洲水动力模型来检查盐度的空间分布与旧金山河口淡水流量的关系。我们特别关注的是流量与低盐度区（LSZ：盐度= 0.5至6）的空间范围以及由其盐度范围定义的-kneton常见物种的栖息地范围的协变。 UnTRIM模型具有非结构化的网格，这使我们能够更早地估算合适的盐度范围的可用性，尤其是对于低盐度物种而言。盐度场对流量的响应受河口测深法的影响。 LSZ的面积和体积为X2的双峰，即沿河口轴到近底部盐度2的距离，大约为LSZ的中间。当LSZ位于三角洲或Carquinez海峡时，面积和体积最小，在Suisun湾时为中等值，在宽而浅的圣巴勃罗湾时最大。用于盐度空间中常见尼克顿物种分布的资源选择函数已从以前的值更新，并用于使用UnTRIM结果计算基于盐度的栖息地指数。这些指数通常随着X2的减小（流量增加）而增加，但是这些关系的斜率大多与流量与流量的对应关系不一致。因此，尽管大多数尼克顿所使用的盐度范围随着流量的增加而扩大，但将种群规模与流量相关的其他机制可能比适当盐度的物理程度更为重要。

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