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，我们对每个潮盆的第2级潮带（即低潮间带）的滨螺属（Littorina sp.）覆盖度进行了测定。在20cm×20cm的样框内划分出16个5cm×5cm的单元格，通过目视法判定每个单元格内是否存在滨螺属物种以记录覆盖情况。我们在海藻斑块内部随机布设3个样框，同时在斑块外侧的无海藻廊道内同样随机布设3个样框。最终以所有样框内16个单元格中出现滨螺属物种的单元格占比，作为滨螺属覆盖度的估算值。