The influence of habitat heterogeneity and latitude on gamma diversity of the Nearctic Simuliidae,a ubiquitous group of stream-dwelling insects

• 来源期刊: 中国昆虫科学（英文版）
• 关键词: aquatic insects biodiversity gamma richness North America Simuliidae streams
• 年，卷（期）: 2018,（4）
• 页码范围: 712-720
• 页数: 9页
• 语种: 英文
• DOI: 10.1111/1744-7917.12442

摘要

Among the most prominent,large-scale patterns of species richness are the increases in richness with decreasing latitude and with increasing habitat heterogeneity.Using the stream-dwelling larval and pupal stages of North American black flies (Diptera:Simuliidae),we address 3 broad questions about species richness:(i) Does a significant latitude-richness relationship exist? (ii) How does habitat heterogeneity influence gamma diversity? (iii) What is the sign (positive or negative) of the latitude richness and the heterogeneity-richness relationships? We found no evidence that habitat heterogeneity influences gamma diversity.The estimated peak species richness for black flies in North America was at 50-53°N,which also corresponds with peak generic richness.All plesiomorphic,extant lineages of the Simuliidae in the Western Hemisphere are found in cool mountainous environments of North America,suggesting that peak richness at 50-53°N might be a signature of this phylogenetic pattern and a reflection of underlying historical processes.