Data for: Species composition of shoreline wolf spider communities vary with salinity but their diets vary with wrack inflow

Wolf spiders are typically the most common group of arthropod predators on both lake and marine shorelines, because of the high prey availability in these habitats. However, shores are also harsh environments due to flooding and, in proximity to marine waters, to toxic salinity levels. Here, we describe the spider community, prey availabilities, and spider diets between shoreline sites with different salinities, albeit with comparatively small differences (5 vs. 7‰). Despite the small environmental differences, spider communities between low and higher-saline sites showed an almost complete species turnover. At the same time, differences in prey availability or spider gut contents did not match changes in spider species composition but rather changed with habitat characteristics within the region, where spiders collected at sites with thick wrack beds had a different diet than sites with little wrack. These data suggest that shifts in spider communities are due to habitat characteristic..., , Files are text files.狼蛛（Wolf spider）通常是湖滨与滨海岸带最为常见的节肢动物捕食者类群，这类生境具备较高的猎物可获得性，这也是其成为优势类群的核心成因。然而，岸带环境同样严苛：既面临洪涝灾害的威胁，紧邻海域的岸带还会承受盐度超标带来的毒性胁迫。本研究针对盐度差异相对较小（5‰与7‰）的岸带样点，系统描述了其蜘蛛群落结构、猎物可获得性以及蜘蛛食性特征。尽管环境差异微小，但低盐与高盐样点的蜘蛛群落却呈现出近乎彻底的物种更替现象。与此同时，猎物可获得性或蜘蛛肠道内含物的差异，并未与蜘蛛物种组成的变化相匹配，而是随区域内的生境特征发生改变：采集自厚层海藻堆积床样点的蜘蛛，其食性与枯落物稀少样点的蜘蛛存在显著差异。本研究数据表明，蜘蛛群落的更替主要受生境特征驱动……（原文未完整）。本次提交的文件均为文本文件。