Survey of adult and juvenile periwinkle snail (Littoraria irrorata) density in mid-marsh and creekbank plots at GCE LTER study sites in October 2017.

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 2017. In each marsh zone at each GCE LTER permanent monitoring site, we counted the number of adult and juvenile snails in 8 replicate quadrats.

为刻画盐沼（salt marsh）内中潮带、溪岸带两个生境带，以及盐度与距海距离梯度下细纹滨螺（Littoraria irrorata）成体与幼体的密度空间变异特征，我们于2017年10月开展了滨螺密度野外调查。在各GCE LTER永久监测站点的每个盐沼生境带中，我们于8个重复样方（quadrats）内统计了成体与幼体滨螺的个体数量。