Pitfalls can trap mobile fauna during their peak surface activity, whereas sediment corer efficiently capture individuals buried in the substrate. Corer sampling is the most used method to capture the sandhopper Atlantorchestoidea brasiliensis, because of the assumption that bias related to surface activity during daylight can be controlled by a careful sampling. The objective of the present study was to evaluate the efficiency of pitfalls to sample the sandhopper A. brasiliensis on sandy beaches with distinct impact levels. We compared our results with a previous impact assessment on the same beach arc that used corer sampling. The sandhopper abundance was more than 10 times higher in the pitfalls compared to the corer samples, suggesting prevalent activity on the sediment surface during daylight and possible bias when using corer sampling to estimate population size. The conclusion of the previous impact assessment, however, was not strongly affected by sampling tools, because seasonal trampling seems to be negative for the number of buried and surface-active individuals. Our results showed that the choice of sampling tool is an important issue to be considered when using sandhoppers as indicator species on sandy beaches.

陷阱可以在活动动物的最高表面活动期间将其困住，而沉积物剥落器可以有效地捕获埋在基质中的个体。由于假设可以通过仔细采样来控制与白天表面活动相关的偏差，因此，Corer采样是捕获沙漏Atlantorchestoidea brasiliensis的最常用方法。本研究的目的是评估陷阱对沙toA。brasiliensis采样的效率。在具有不同影响水平的沙滩上。我们将我们的结果与先前在使用corer采样的同一海滩弧上进行的影响评估进行了比较。与核心样品相比，沙坑中的沙坑丰度高出10倍以上，这表明白天白天沉积物表面普遍存在活性，使用核心取样估算种群数量时可能存在偏差。但是，以前的影响评估的结论并未受到抽样工具的强烈影响，因为季节性践踏对被掩埋和具有表面活性的个体的数量似乎是不利的。我们的结果表明，在沙滩上使用沙漏作为指示物种时，采样工具的选择是一个重要的考虑因素。