Griotti Mariana, Muñoz-Escobar Christian, Ferretti Nelson E
Instituto Argentino de Investigaciones de las Zonas Áridas IADIZA (CCT-CONICET), Av. A. Ruiz Leal s/n, Parque Gral. San Martín (5500), Mendoza, Argentina.
Programa de Doctorado en Sistemática and Biodiversidad. Departamento de Zoología, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Chile.
Environ Entomol. 2017 Aug 1;46(4):794-803. doi: 10.1093/ee/nvx094.
The link between vegetation structure and spider diversity has been well explored in the literature. However, few studies have compared spider diversity and its response to vegetation at two conceptual levels: assemblage (species diversity) and ensemble (guild diversity). Because of this, we studied spider diversity in riparian and adjacent habitats of a river system from the Chacoan subregion in central Argentina and evaluated their linkage with vegetation structure at these two levels. To assess vegetation structure, we measured plant species richness and vegetation cover in the herb and shrub - tree layers. We collected spiders for over 6 months by using vacuum netting, sweep netting and pitfall traps. We collected 3,808 spiders belonging to 119 morphospecies, 24 families and 9 guilds. At spider assemblage level, SIMPROF analysis showed significant differences among studied habitats. At spider ensemble level, nevertheless, we found no significant differences among habitats. Concerning the linkage with vegetation structure, BIOENV test showed that spider diversity at either assemblage or ensemble level was not significantly correlated with the vegetation variables assessed. Our results indicated that spider diversity was not affected by vegetation structure. Hence, even though we found a pattern in spider assemblages among habitats, this could not be attributed to vegetation structure. In this study, we show that analyzing a community at two conceptual levels will be useful for recognizing different responses of spider communities to vegetation structure in diverse habitat types.
植被结构与蜘蛛多样性之间的联系在文献中已有充分探讨。然而，很少有研究在两个概念层面上比较蜘蛛多样性及其对植被的响应：群落（物种多样性）和功能团（功能群多样性）。因此，我们研究了阿根廷中部查科亚地区一个河流系统的河岸及相邻栖息地的蜘蛛多样性，并在这两个层面评估了它们与植被结构的联系。为评估植被结构，我们测量了草本层和灌木 - 乔木层的植物物种丰富度和植被覆盖度。我们通过使用吸虫网、扫网和陷阱诱捕器收集蜘蛛超过6个月。我们收集到了3808只蜘蛛，分属于119个形态种、24个科和9个功能群。在蜘蛛群落层面，SIMPROF分析显示所研究的栖息地之间存在显著差异。然而，在蜘蛛功能团层面，我们发现栖息地之间没有显著差异。关于与植被结构的联系，BIOENV检验表明，无论是群落层面还是功能团层面的蜘蛛多样性，都与所评估的植被变量没有显著相关性。我们的结果表明，蜘蛛多样性不受植被结构影响。因此，尽管我们在不同栖息地的蜘蛛群落中发现了一种模式，但这不能归因于植被结构。在本研究中，我们表明在两个概念层面分析一个群落，将有助于认识蜘蛛群落在不同栖息地类型中对植被结构的不同响应。
