Evaluation of a pump method for unbiased sampling of stream hyporheos
Evaluation of a pump method for unbiased sampling of stream hyporheos
复制标题
流式流变无偏采样泵法的评估
DOI：
10.1007/s10750-014-1820-x
复制
发表时间：
2014
期刊：
影响因子：
2.6
通讯作者：
Takemon Y
中科院分区：
文献类型：
--
作者：
Tanaka A;Namba T;Tanida K;Takemon Y
在日本纪津川下游的海岸地区，通过比较泵法和岩心法，研究了泵法在下流野外调查中的适用性。第一个10升的泵样品与10升的潜流水（相当于）的核心样品相比，抽样偏差指数表明，泵的方法低估了丰度的大多数类群，除了太阳虫Centrohelida。根据体型和采样偏倚指数将动物分为三组;体型较小和采样偏倚指数较高的动物的平坦度指数通常接近1.0。根据连续泵送中连续分数值的降低模式，将动物分为三组。虽然甲壳纲动物往往是过多的泵样品，其中的相对密度与那些在核心样品，除了harpacticoid桡足类。在50升泵样和1,000立方厘米岩芯样品中，除甲壳纲和Centrohelida外，具有中间减少模式的动物具有相似的相对丰度。结果表明，通过使用适当的分类依赖量的水，泵的方法是有用的，用于检查潜流动物群落组成。
The applicability of a pump method for field surveys of hyporheos was investigated for taxon-specific collection bias by comparing a pump method with a core method in a shore area of the lower reach of Kizu River in Japan. A sampling bias index for the first 10 l of pump samples compared with 10 l hyporheic water (equivalent) core samples showed that the pump method underestimated the abundance of most taxa, except for the heliozoan Centrohelida. Animals were classified into three groups based on body size and sampling bias index; animals with small bodies and high sampling bias indices generally had flatness indices near 1.0. The animals were also classified into three groups based on patterns of reduction in serial fraction values in consecutive pumpings. Although Crustacea tended to be overrepresented in the pump samples, relative densities among them were comparable to those in the core samples, except for harpacticoid copepods. Animals with an intermediate reduction pattern had a similar relative abundance in the 50-l pump and 1,000-cm3core samples, except for Crustacea and Centrohelida. The results suggest that by using an adequate taxon-dependent volume of water, the pump method is useful for examining the community composition of hyporheic fauna.