Data on snail coverage in a mesocosm experiment in the Oslofjord June to September 2022

In August and September 2022, we measured Littorina sp. coverage on step 2 (the lower intertidal) in each basin. Coverage was visually identified as presence or absence in each of 16 5x5cm large cells within a 20x20 cm frame. Three frames were randomly placed within the seaweed patches and three in the seaweed-free corridors outside of the patches. Coverage was estimated as the percent of all 16 cells in the frames having Littorina sp. presence.2022年8月至9月，我们对每个潮盆内第2阶（低潮间带）区域的滨螺属（Littorina sp.）盖度开展测定。具体判定方式为：将20×20 cm样框划分为16个5×5 cm的子样方，逐一目视判定每个子样方内是否存在滨螺属生物。我们在海藻斑块内部随机布设3个样框，在斑块外侧的无海藻廊道内同样布设3个样框。最终盖度以所有样框的16个子样方中存在滨螺属生物的子样方占比进行估算。