Vanaverbeke Jan, Deprez Tim, Vincx Magda
Ghent University, Biology Department, Marine Biology Section, Krijgslaan, 281/S8, B-9000 Gent, Belgium.
Mar Pollut Bull. 2007 Sep;54(9):1351-60. doi: 10.1016/j.marpolbul.2007.05.019. Epub 2007 Jul 10.
We investigated the long-term effects of sand extraction activities on the nematode communities from the Kwintebank. Although changes in nematode community composition cannot be completely uncoupled from natural processes, we suggest that the morphological changes in the sandbank and physical disturbance associated with the dredging activities indeed affected nematode community composition. Nematode diversity did not change since the start of the extraction activities but nematode community composition changed significantly. The SIMPER routine identified predatory nematodes to be important for the within group similarity at the start of the exploitation, while similarity in 1997 and 2001 was determined by the contribution of deposit feeding nematodes. In addition, long nematodes, vulnerable to physical disturbance became less important. These changes are attributed to long term changes in sediment characteristics in combination with additional short-term disturbances by the creation and filling of dredge furrows which are related to the extraction activities.
我们研究了采砂活动对昆特班克线虫群落的长期影响。尽管线虫群落组成的变化无法完全与自然过程分离，但我们认为，沙堤的形态变化以及与疏浚活动相关的物理干扰确实影响了线虫群落组成。自采砂活动开始以来，线虫多样性没有变化，但线虫群落组成发生了显著变化。SIMPER程序确定，在开采初期，捕食性线虫对组内相似性很重要，而1997年和2001年的相似性则由沉积取食线虫的贡献决定。此外，易受物理干扰的长线虫变得不那么重要了。这些变化归因于沉积物特征的长期变化，以及与采砂活动相关的疏浚沟渠的形成和填充所带来的额外短期干扰。
