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Effects of sediment transport on intergravel flow and egg survival in silt-rich spawning beds.

机译：富泥产卵床中泥沙输送对砂砾间流量和卵存活的影响。

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摘要

Previous studies have shown fine sediment was removed from spawning beds when salmon dug nests and subsequent sediment deposition can re-clog the nests, which reduces intergravel flow and threatens egg survival. In the intensively logged Cascapédia watershed it is not known if there is enough sediment deposition to re-clog salmon nests. Furthermore, Cascapédia spawning beds are relatively silt-rich, whereas, the effect of fine sediment has been studied in rivers with sand-rich substrate. I evaluated if sediment-epositing events reduced intergravel flow and if these events inhibited egg survival.;During the summer and fall 2001, sediment deposition into clean gravel occurred at rates proportional to the length and dose of suspended sediment transporting events. Based on the results of an experimental sensor, sediment deposition reduced intergravel water velocities. Habitat conditions within artificial salmon nests, however, remained above critical levels for egg survival. Eggs survived (81%) until mid-April, at which time they were at the pre-hatched life-stage. The data suggests that in Cascapédia rivers, egg survival is likely only inhibited if the spring-freshet erodes or clogs the salmon nests.
机译：先前的研究表明，当鲑鱼挖巢时，会从产卵床中清除细小的沉积物，随后的沉积物沉积会再次阻塞巢穴，这会降低砾石流并威胁卵的存活。在密集采伐的卡斯卡佩迪亚流域，尚不清楚是否有足够的沉积物沉积物重新堵塞鲑鱼巢。此外，卡斯卡佩迪亚产卵床的淤泥含量相对较高，而在含沙量丰富的河​​流中已研究了细沙的作用。我评估了沉积物沉积事件是否减少了砾石流，以及这些事件是否抑制了卵的存活。在2001年夏季和秋季，沉积物沉积到干净的砾石中的速率与悬浮沉积物传输事件的长度和剂量成正比。根据实验传感器的结果，沉积物沉积降低了砾石间的水流速度。但是，人工鲑鱼巢中的生境条件仍高于卵生存的临界水平。鸡蛋幸存下来（81％），直到四月中旬，那时它们处于孵化前的生命阶段。数据表明，在卡斯卡佩迪亚河中，只有当春季鲜鱼侵蚀或阻塞鲑鱼巢时，卵的存活才可能受到抑制。

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  • 作者

    Zimmermann, Andre E.;

  • 作者单位

    McGill University (Canada).;

  • 授予单位 McGill University (Canada).;
  • 学科 Physical Geography.;Agriculture Fisheries and Aquaculture.;Hydrology.
  • 学位 M.Sc.
  • 年度 2003
  • 页码 157 p.
  • 总页数 157
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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