Environmental heterogeneity, rather than stability, explains spider assemblage differences between ecosystems

Open ecosystems (e.g., grasslands, prairies, shrublands) tend to be ecologically less stable than closed ones (i.e., forests) and encompass higher spatial heterogeneity in terms of environmental diversity. Such differences are expected to differentially constrain the diversity and structure of the communities that inhabit each of them, but identifying the specific processes driving contrasting biodiversity patterns between open and closed systems is challenging. In order to understand how environmental variability might structure spider assemblages, both between and within open and closed ecosystems, we implement a high throughput multiplex barcode sequencing approach to generate a dataset for 8585 specimens representing 168 species, across open ecosystems within the Canary Islands. Combining these with spider sequences from closed ecosystems within the same islands, we show that spider communities in open ecosystems show higher species richness, higher beta diversity, and higher propor..., A total of 25 sites were sampled within open shrublands characterised by the presence of species of Euphorbia across the four western islands of the Canary Archipelago. These data were complemented with an existing dataset including 31 closed laurel forest sites across the same islands. Sampled individuals were examined under a stereomicroscope, and provisional taxonomic assignments were made at the species, genus, or family level. Subsequently, all specimens were DNA-barcoded using the multiplex barcoding approach. Community dissimilarity matrices were estimated at the species level across all sites. Matrices were generated using total β diversity (Sørensen index, βsor) and its additive turnover (Simpson index, βsim) and nestedness (βsne) components. To disentangle the contribution of different factors in the βsor within ecosystems, generalised dissimilarity models (GDM) were applied. A matrix of dissimilarity across sites was implemented as the response variables, and geographical dis..., , # Environmental heterogeneity, rather than stability, explains spider assemblage differences between ecosystems

This README.txt file was generated on 2024-08-21 by Daniel Suárez

## GENERAL INFORMATION

1. Author Information
* Corresponding Investigator Name: Dr. Brent Charles Emerson Institution: IPNA-CSIC, San Cristóbal de La Laguna, Canary Islands, Spain Email: [[e-mail]](mailto:[e-mail])
* Co-investigator 1 Name: Daniel Suárez Institution: IPNA-CSIC, San Cristóbal de La Laguna, Canary Islands, Spain
* Co-investigador 2 Name: Paula Arribas Institution: IPNA-CSIC, San Cristóbal de La Laguna, Canary Islands, Spain
* Co-investigator 4 Name: Amrita Srivathsan Institution: Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Centre for Integrative Biodiversity Discovery, Berlin, Germany
* Co-investigator 5 Name: Rudolf Meier Institution: Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Ce...

开放生态系统（例如草原、稀树草原、灌丛）在生态学层面往往较封闭生态系统（即森林）更不稳定，且在环境多样性维度具备更高的空间异质性。这类差异预计会对栖息于两类系统中的群落的多样性与结构产生差异化限制，但厘清驱动开放与封闭系统间生物多样性模式差异的具体过程仍颇具挑战。为探究环境异质性如何塑造开放与封闭生态系统之间及内部的蜘蛛类群组成，我们采用高通量多重条形码测序技术，针对加那利群岛境内开放生态系统中的8585号标本（涵盖168个物种）生成了数据集。将其与同一群岛内封闭生态系统的蜘蛛序列数据结合后，我们发现开放生态系统中的蜘蛛群落具备更高的物种丰富度、更高的β多样性（Beta diversity）以及更高的占比……
我们在加那利群岛西部四座岛屿内，以大戟属（Euphorbia）物种为特征的开放灌丛生境中共布设25个采样点。本数据集辅以现有数据集，后者涵盖同一群岛内的31个封闭月桂林采样点。采样个体经体视显微镜检视后，在物种、属或科水平完成临时分类学鉴定。随后，所有标本均通过多重条形码测序技术完成DNA条形码分析。基于所有采样点的物种水平数据构建了群落相异矩阵，分别以总β多样性（索伦森指数，Sørensen index，βsor）及其组分分解的周转（辛普森指数，Simpson index，βsim）与嵌套性（βsne）生成对应矩阵。为解析生态系统内总β多样性的不同影响因子贡献，我们采用了广义相异模型（Generalised Dissimilarity Models, GDM）。以样点间的相异矩阵作为响应变量，地理距离……
# 环境异质性而非稳定性可解释生态系统间的蜘蛛类群组成差异
本README.txt文件由Daniel Suárez于2024年8月21日生成。
## 一般信息
1. 作者信息
* 通讯研究者：Brent Charles Emerson博士，所属机构：西班牙加那利群岛拉古纳圣克里斯托瓦尔IPNA-CSIC，电子邮箱：[e-mail]
* 共同研究者1：Daniel Suárez，所属机构：西班牙加那利群岛拉古纳圣克里斯托瓦尔IPNA-CSIC
* 共同研究者2：Paula Arribas，所属机构：西班牙加那利群岛拉古纳圣克里斯托瓦尔IPNA-CSIC
* 共同研究者4：Amrita Srivathsan，所属机构：德国柏林莱布尼茨进化与生物多样性科学研究所、整合生物多样性发现中心
* 共同研究者5：Rudolf Meier，所属机构：德国柏林莱布尼茨进化与生物多样性科学研究所……