瞬态流动结构和幼虫附着时机：藤壶幼虫游动附着

2017/02/09   下载量： 3 次

方案摘要

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应用领域 生物产业
检测样本 其他
检测项目
参考标准 暂无

采用英国Litron公司的30毫焦双脉冲PIV激光器，LaVision Imager Pro X PIV相机。在LaVision的硬件控制和数据采集软件平台DaVis集成控制下。对水中藤壶幼虫的游动附着过程进行了观测研究。

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Water flow affects settlement of marine larvae on several scales. At the smallest scale local
flow regime may control the probability of adhesion to the substrate. Our aim was to mechanistically
understand the transition from suspended to attached larvae in turbulent flow.
Recently it was proposed that opportunities for larval settlement in turbulent boundary layers
depend on time windows with suitable instantaneous flow properties. In flume flow we
characterized the proportion of suitable time windows in a series of flow velocities with
focus on the near-bed flow. The change in the proportion of potential settling windows with
increasing free-stream velocities was compared to the proportion of temporary attachment
of barnacle cypris larvae at different flow velocities. We found large instantaneous flow variations
in the near-bed flow where cyprid attachment took place. The probability of temporary
attachment in cyprids declined with local flow speed and this response was compatible with
a settling window lasting at least 0.1 s with a maximum local flow speed of 1.9–2.4 cm s-1.
Cyprids swam against the near-bed flow (negative rheotaxis) and the swimming speed (1.8
cm s-1) was close to the critical speed that permitted temporary attachment. We conclude
that temporary attachment in barnacle cyprids requires upstream swimming to maintain a
fixed position relative to the substrate for at least 0.1 s. This behaviour may explain the ability
of barnacles to recruit to high-flow environments and give cyprids flexibility in the pre-settlement
choice of substrates based on flow regime.

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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