Survey of adult and juvenile periwinkle snail (Littoraria irrorata) density in mid-marsh and creekbank plots at GCE LTER study sites in October 2020.

To characterize spatial variation in the adult and juvenile density of periwinkle snails, Littoraria irrorata, within two zones in the salt marsh, the mid-marsh and creekbank, and across a gradient in salinity and distance to ocean, we surveyed snail density in October 2020. In each marsh zone at each GCE LTER permanent monitoring site, we counted the number of adult and juvenile snails in 8 creekbank and 12 mid-marsh replicate quadrats.为阐明盐沼内中部盐沼带与溪岸带两个生境带中，细纹玉黍螺（Littoraria irrorata）的成体与幼体密度的空间变异特征，及其沿盐度梯度与距海距离梯度的变化趋势，我们于2020年10月开展了螺类密度调查。在每个GCE LTER长期监测样地的各盐沼生境带中，我们分别在8个溪岸带重复样方与12个中部盐沼带重复样方内，计数了该螺类成体与幼体的个体数量。