...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine biology >Effects of brackish water incursions and diel phasing of tides on vertical excursions of the keystone predator Pisaster ochraceus
【24h】

Effects of brackish water incursions and diel phasing of tides on vertical excursions of the keystone predator Pisaster ochraceus

机译：咸淡水入侵和潮汐的狄尔定相对梯形捕食者Pi鱼Pi鱼垂直偏移的影响

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 physical factors that constrain the vertical foraging excursions of the keystone predator, the sea star Pisaster ochraceus, hold considerable interest because they indirectly shape the vivid patterns of zonation of rocky shore communities by impeding or enhancing the ability of P. ochraceus to traverse the intertidal zone. In this paper, we describe a study conducted in the Pacific Northwest of North America in which we examined, in the field and laboratory, the abiotic factors that can affect vertical excursions by P. ochraceus. Our field observations revealed that the extreme upward reach and average shore level height reached by P. ochraceus were significantly lower for daylight high tides than nocturnal high tides. Based on diver observations following a severe storm, it would also appear that these diurnal movements can be impeded by freshwater incursions into the intertidal zone; a regularly occurring event in the Pacific Northwest. As part of an experimental investigation into this phenomenon, we observed that sea stars maintained in tall cylindrical aquaria, without tidal flux, remained near the bottom during daylight and moved to the top of the column at night, suggesting that photoperiod alone can influence the cycle of vertical movement. Adding a freshwater layer to the aquaria restricted these vertical excursions. Our results suggest that on rocky coastlines susceptible to fresh water incursions, the suppression of foraging may be an important factor in the spatial and temporal variation in the intensity of predation. Furthermore, given the relative increase in frequency and intensity of freshwater incursions in the Pacific Northwest and the intolerance of P. ochraceus to lowered salinity, there is the long-term potential to significantly alter patterns of species zonation in this essential marine habitat.
机译：限制基石捕食者海洋星Pi鱼鱼垂直觅食偏移的物理因素引起人们极大的兴趣，因为它们通过阻止或增强草对虾穿越潮间带的能力而间接塑造了岩岸社区的生动分区模式。区。在本文中，我们描述了在北美西北太平洋地区进行的一项研究，在该研究中，我们在田野和实验室中检查了可能影响och草假单胞菌垂直偏移的非生物因素。我们的野外观测表明，在白天高潮时，och鱼的极端向上延伸和平均岸上高度明显低于夜间高潮。根据暴风雨后潜水员的观察，似乎还可能由于淡水入侵潮间带而阻碍了这些昼夜运动。西北太平洋地区经常发生的事件。作为对此现象进行实验研究的一部分，我们观察到维持在高圆柱状水族箱中的海星没有潮汐通量，在白天时仍停留在底部附近，而在夜晚移至柱顶，这表明光周期可以影响周期垂直运动。在水族箱中增加淡水层限制了这些垂直偏移。我们的研究结果表明，在容易受到淡水入侵的岩石海岸线上，抑制觅食可能是捕食强度时空变化的重要因素。此外，鉴于西北太平洋地区淡水入侵的频率和强度相对增加，以及草对盐度降低的不耐受性，在这一重要的海洋生境中，具有长期改变物种分区模式的长期潜力。

著录项

  • 来源
    《Marine biology》 |2010年第3期|673-682|共10页
  • 作者

    Corey Garza; Carlos Robles;

  • 作者单位

    Division of Science and Environmental Policy, California State University, Monterey Bay, 100 Campus Center, Seaside, CA 93955, USA;

    Department of Biological Sciences, California State University, Los Angeles, 5151 State University Drive, Los Angeles, CA 90032, USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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