Effects of trampling on rocky intertidal communities

This data is from an experiment that was designed to assess the impact of trampling on Hormosira mats, Xenostrobus beds and in areas of 'bare-rock' where Siphonaria diemenensis are the numerically dominant gastropod species. Experimental plots were walked on a number of times per month to match the seasonal changes in the number of people using the reefs. The experiment started in early February 1990 and sampled approximately every 3 months, after 10, 17, 25, 39 and 45 visits. The variables measured in each strip were the percent cover of Hormosira and other non-turfing algae, number of gastropods per strip, number of Siphonaria and percent cover of Xenostrobus.

本数据集源自一项旨在评估踩踏活动对囊藻（Hormosira）群落、偏顶蛤（Xenostrobus）床以及以迪门氏伞螺（Siphonaria diemenensis）为数量优势腹足类（gastropod）物种的裸岩区域所产生影响的操控实验。实验样地每月接受的踩踏次数，与沿岸礁体的人类使用量的季节变化相匹配。本实验于1990年2月初启动，分别在第10、17、25、39、45次踩踏后，约每3个月开展一次采样。每个样条（strip）测量的变量包括：囊藻及其他非藻席藻类的盖度百分比、每样条的腹足类总数量、迪门氏伞螺的个体数量，以及偏顶蛤的盖度百分比。