ABSTRACT

We analyzed the spatial-seasonal patterns on the abundance, composition, structure (i.e. abundance distribution among species), and diversity of the ground-dwelling spiders belonging to the retrolateral tibial apophysis (RTA) clade in two pine-oak forest remnants from Mexico. Additionally, a short review to compare the RTA ground-dwelling communities from Mexican habitats was carried out. Spiders were collected monthly, from July 2010 to June 2011, using pitfall-traps at each site. Species composition was seasonally, but not spatially, different. Estimated diversity for the Hill number 1 was influenced by the sites, and a site–season interaction effect was yielded for the Hill number 2. Abundance and community structure were strongly influenced by both sites and seasons. Six species exhibited strong associations with spatial and seasonal-specific conditions (possible bioindicators). Bibliographic analysis showed the highest richness and the lowest number of undescribed species in desert habitats of northern Mexico, pointing those as possible species repositories for the RTA clade. Our results showed a heterogenous spatial-seasonal response in the RTA ground-dwelling spiders, together with a weak influence of the regional variation in temperature and precipitation on the abundance and species richness, suggesting a stronger influence of ecological drivers at the microhabitat scale.

摘要

我们分析了来自墨西哥的两个松橡树林残余物中属于后外侧胫骨隆突 (RTA) 进化枝的地栖蜘蛛的丰度、组成、结构（即物种间的丰度分布）和多样性的空间季节性模式。此外，还进行了一项简短的审查，以比较来自墨西哥栖息地的 RTA 地面住宅社区。从 2010 年 7 月到 2011 年 6 月，每个月都使用陷阱陷阱收集蜘蛛。物种组成是季节性的，但不是空间上的不同。Hill 1 的估计多样性受站点影响，Hill 2 产生站点-季节交互效应。丰度和群落结构受站点和季节的强烈影响。六个物种表现出与空间和季节性特定条件（可能的生物指标）的强烈关联。书目分析显示，墨西哥北部沙漠栖息地中未描述物种的丰富度最高，数量最少，这表明这些物种可能是 RTA 进化枝的物种库。我们的研究结果表明，RTA 地栖蜘蛛存在异质的空间季节性响应，温度和降水的区域变化对丰度和物种丰富度的影响较弱，表明微生境尺度上生态驱动因素的影响更大。