Survey of adult and juvenile periwinkle snail (Littoraria irrorata) density in mid-marsh and creekbank plots at GCE LTER study sites in October 2016.

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 2016. In each marsh zone at each GCE LTER permanent monitoring site, we counted the number of adult and juvenile snails in replicate quadrats (8 in creekbank and 12 in mid-marsh zones).

为表征盐沼内潮间带中部与溪岸带两个生境带，以及沿盐度与距海距离梯度的区域中，带纹滨螺（Littoraria irrorata）成体与幼体的种群密度空间变异特征，我们于2016年10月开展了滨螺密度调查。在各GCE LTER永久监测样地的对应潮间带生境中，我们于重复样方（溪岸带设置8个样方，潮间带中部设置12个样方）内统计了成体与幼体滨螺的数量。