...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >The effect of a permanent saltwater barrier on Rangia cuneata, an indicator species of brackish conditions
【24h】

The effect of a permanent saltwater barrier on Rangia cuneata, an indicator species of brackish conditions

机译：永久性盐水屏障对rangia cuneata的影响，淡咸的条件的指示物种

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

Rangia cuneata is a brackish water clam with a broad distribution along western Atlantic coasts and is an important component of estuarine communities. Adult R. cuneata are tolerant of salinities ranging from 0 to 32 but limited experimental studies have indicated that spawning and larval development are constrained to salinities between 2 and 10. In 2003, a permanent saltwater barrier was built in the lower Neches River, Texas, that partitioned a population of R. cuneata that had been surveyed since the 1950s. The barrier prevented salt water intrusions upstream and provided a natural experiment to determine how the regulation of salinity intrusion can influence R. cuneata spawning, recruitment, and establishment. We surveyed a total of 12 historical sites (eight above and four below the barrier) plus one site outside the previous surveys. Above the barrier, five sites had no living R. cuneata and the remaining three sites had very low densities (0.2 per m(-2)). The large sizes of the few R. cuneata above the barrier (mean = 65.8 mm) suggested no spawning, with energy instead being invested into somatic growth. It also demonstrated the effectiveness of the barrier in preventing the continued recruitment of R. cuneata upstream and supports the hypothesis that non-zero salinity levels are needed for successful reproduction of the species. Populations downstream from the barrier experienced a resurgence in population size since the last survey in 1992, with one site having 86 individuals m(-2). The presence of distinct size cohorts indicated that spawning and recruitment occurs sporadically. Using the results of previous research, we defined the conditions apparently needed for successful reproductive events as warm weather periods with a salinity change (= 4 over a week) to induce spawning and elevated salinity levels (2-10 for 15+ days) for larval development. Using these criteria, we identified three salinity influx events on the lower Neches River in the last eight years that correlate with the presence of the size cohorts observed below the barrier, which support the hypothesis that salinity fluxes and durations are needed to induce spawning and facilitate larval recruitment.
机译：Rangia Cuneata是一块咸水蛤，沿西部大西洋海岸广泛分销，是河口社区的重要组成部分。成人R. CUNEATA耐受性的盐度范围从0到32次，但有限的实验研究表明，产卵和幼虫发育受到2至10之间的约束盐度。2003年，一个永久的盐水屏障建于德克萨斯州的下部尼斯河，自20世纪50年代以来一直调查的R. Cuneata的人口分开。障碍防止盐水入侵上游，并提供了一种自然的实验，以确定盐度入侵的调节如何影响R. CUNEATA产卵，招聘和建立。我们调查了12个历史地点（上面八个和下面的屏障下面的四个）加上前一届调查之外的一个网站。在屏障之上，五个地点没有生活R. CUNEATA，其余的三个位点具有非常低的密度（0.2 / m（-2））。屏障上方的少数R. CUNEATA（平均= 65.8毫米）的大尺寸表明没有产生的产卵，而不是投入体细胞生长。它还展示了阻隔的有效性，以防止持续募集R. CUNEATA上游，并支持成功繁殖物种繁殖所需的非零盐度水平的假设。自1992年上次调查以来，屏障下游的人口大小在人口大小的复苏中经历了一个人口大小，其中一个网站有86个个人M（-2）。不同尺寸的群组的存在表明产卵和招募均匀地发生。使用先前研究的结果，我们定义了成功的生殖事件作为盐度变化（> = 4超过一周）的温暖天气期间的条件，以诱导产卵和升高的盐度水平（2-10持续15天）幼虫发展。使用这些标准，我们在过去八年中确定了三个盐度流入事件，在过去的八年中，与在屏障下方观察到的尺寸队列的存在相关，这支持盐度助熔剂和持续时间来诱导产卵和促进幼虫招聘。

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