The volume of water filtered by a Continuous Plankton Recorder sample: the effect of ship speed
The volume of water filtered by a Continuous Plankton Recorder sample: the effect of ship speed
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DOI：
10.1093/plankt/fbh137
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发表时间：
2004-12-01
影响因子：
2.1
通讯作者：
Hays, GC
中科院分区：
文献类型：
--
作者：
Jonas, TD;Walne, A;Hays, GC
连续浮游生物记录仪(CPR)调查是世界上最大的浮游生物监测计划之一。自1931年以来，CPR已经收集了大约38万个样本，每个样本代表10英里的拖曳。假设每个样品过滤的海水体积保持不变，接近3m(3)。在这项研究中，1995年至2000年期间，在CPR调查监测的两条路线(SA和IN)上测量了为每个CPR样本过滤的体积。尽管SA路线的滤水量接近3m(3)的理论值(3.2m(3))，但IN路线的滤水量(3.8m(3))明显更高。滤水量与船舶航速呈显著负相关。这一关系表明，船速越快，过滤的体积越低。这可能会对CPR调查产生影响，因为自20世纪50年代末以来，船只的速度一直在不断提高。然而，船舶航速的长期变化与浮游生物变异性的两个常用指标：浮游植物颜色和总桡足类指数之间没有明显的相关性。这种关系的缺乏可能表明，与水文气候强迫的影响相比，所发现的影响较小，尽管需要更广泛的研究来证实这些发现。
The Continuous Plankton Recorder (CPR) survey is one of the largest plankton-monitoring programmes in the world. Since 1931, the CPR has collected similar to380 000 samples, each representing 10 miles of tow. It has been assumed that the volume of seawater filtered by each sample remained constant and close to 3 m(3). In this study, the volume filtered for each CPR sample was measured on two routes (SA and IN)), monitored by the CPR survey, between 1995 and 2000. Although the filtered volume was near the theoretical value of 3 m(3) on the SA route (3.2 m(3)), it was significantly higher on the IN route (3.8 m(3)). A significant negative relationship was found between the volume filtered and the speed of the ships. This relationship indicates that the faster the speed of the ship, the lower the volume filtered. This could have implications for the CPR survey as the speed of the ships has increased continuously since the end of the 1950s. However, no significant correlation was found between the long-term changes in the speed of the ships and two commonly used indicators of plankton variability: the Phytoplankton Colour and the Total Copepods indices. This absence of relationship may indicate that the effect found is small in comparison with the influence of hydroclimatic forcing, although a more extensive study is needed to confirm these findings.