Pompozzi Gabriel, Copperi Sofía, Schwerdt Leonela, Ferretti Nelson
Rev Biol Trop. 2014 Mar;62(1):87-93.
The "Ernesto Tornquist" Provincial Park (ETPP) is located inside the Ventania system (Argentina) and was created to protect one of the last relicts of pampean grasslands. Even though many studies have looked at the vertebrate faunal diversity, biology, and conservation in this Park, few studies have been dedicated to arthropods. Among these, spiders have been used as ecological indicators to evaluate nature conservation status, nevertheless, basic information on their distribution and ecology is necessary for their use as indicator taxa in this region. Thus the goal of this study was to present the phenology and demography of the spider Odo bruchi, a cursorial spider present in the ETPP. For this, spiders were sampled bimonthly using pitfall traps between September 2009-2010 (first year), and March 2011-2012 (second year). A total of 10 traps were placed every 10m along a transect of 100m parallel to the longest axis ofa grassland slope with native vegetation. Traps were filled with 1 500mL of ethylene glycol, that were examined and refilled every 60 day period. We collected a total of 799 specimens in two years. Juveniles were the most abundant reaching 47.8% of the total, while males corresponded to 27.8% and females 24.4%. We found significant differences in the mean abundance of O. bruchi: the abundance during spring-summer (Nov-Dec-Jan-Feb) was significantly higher than the other periods of the two years period. Moreover, we found an even abundance distribution throughout the year in the entire study. This work represents one of the first contributions to the ecology of this spider family in the area. Also, our results comprise relevant information to encourage future studies on this spider species as a bio-indicator of the conservation status of pampean grasslands.
“欧内斯托·托恩奎斯特”省立公园（ETPP）位于文塔尼亚系统（阿根廷）内，其设立目的是保护潘帕斯草原最后的遗迹之一。尽管已有许多研究关注该公园内脊椎动物的区系多样性、生物学特性及保护情况，但针对节肢动物的研究却很少。其中，蜘蛛被用作生态指标来评估自然保护状况，然而，要将其作为该地区的指示分类单元，还需要了解它们分布和生态的基本信息。因此，本研究的目的是呈现ETPP中一种游走型蜘蛛——布鲁奇奥多蛛的物候学和种群统计学特征。为此，在2009年9月至2010年（第一年）以及2011年3月至2012年（第二年）期间，每隔两个月使用陷阱诱捕器对蜘蛛进行采样。沿着一条与有原生植被的草地斜坡最长轴平行的100米样带，每隔10米放置10个陷阱。陷阱中装有1500毫升乙二醇，每60天检查并重新装填一次。两年间我们共收集到799个标本。幼蛛数量最多，占总数的47.8%，雄性占27.8%，雌性占24.4%。我们发现布鲁奇奥多蛛的平均丰度存在显著差异：春夏季（11月至12月、1月至2月）的丰度显著高于两年中的其他时期。此外，在整个研究期间，我们发现其全年丰度分布均匀。这项工作是该地区对这种蜘蛛生态研究的首批贡献之一。而且，我们的研究结果包含了相关信息，有助于鼓励未来将这种蜘蛛作为潘帕斯草原保护状况生物指标的研究。
