Worthen Wade B, Fravel R Kile, Horne Connor P
Biology Department, Furman University, Greenville, SC 29613, USA.
1716 Johnson Marina Rd, Chapin, SC 29036, USA.
Insects. 2021 Feb 27;12(3):201. doi: 10.3390/insects12030201.
The community structure of lotic odonates (Insecta: Odonata) changes downstream, but it is difficult to untangle natural and anthropogenic causes. We surveyed larvae and adults at 15 sites along the Reedy River in Greenville Co., SC, USA, from sites in forested suburban landscapes through the urban core of the city of Greenville. We used principal component analyses and Akaike information criteria models to describe the relationships between larval and adult community descriptors (abundance, richness, and diversity) and habitat characteristics at several spatial scales, including water chemistry, sediment and detritus, aquatic and streamside vegetation, and the percent cover of landforms in the surrounding landscape. At all scales, larval abundance, richness, and diversity correlated with the amount of detritus. At a small scale, adult indices correlated with the amount of sunlight and streamside vegetation. Zygopteran community composition was nested at a large scale; richness and diversity did not correlate with changes in the landscape but increased downstream. Anisopteran composition was also nested, but richness correlated with the percent cover of field, wetland, and open water in the habitat and was unrelated to downstream site position. Landscape transformation affected anisopterans more than zygopterans by opening habitats that facilitate these generalist heliotherms.
流水生境蜻蛉目（昆虫纲：蜻蜓目）的群落结构随下游位置而变化，但很难厘清自然和人为因素。我们在美国南卡罗来纳州格林维尔县的里迪河沿岸15个地点进行了调查，涵盖从森林环绕的郊区景观到格林维尔市城市核心区域的地点，对幼虫和成虫进行了调查。我们使用主成分分析和赤池信息准则模型，在几个空间尺度上描述幼虫和成虫群落描述符（丰度、丰富度和多样性）与栖息地特征之间的关系，这些特征包括水化学、沉积物和碎屑、水生和溪边植被，以及周围景观中地貌的覆盖百分比。在所有尺度上，幼虫的丰度、丰富度和多样性都与碎屑量相关。在小尺度上，成虫指标与阳光量和溪边植被相关。蟌科群落组成在大尺度上呈嵌套分布；丰富度和多样性与景观变化无关，但随下游方向增加。差翅亚目组成也呈嵌套分布，但丰富度与栖息地中田野、湿地和开阔水域的覆盖百分比相关，与下游地点位置无关。景观改造对差翅亚目昆虫的影响大于蟌科昆虫，因为改造创造了有利于这些广适性喜阳生物的栖息地。
