Michels G J, Carney V A, Jones E N, Pollock D A
Texas AgriLife Research, Bushland, TX 79012, USA.
Environ Entomol. 2010 Jun;39(3):738-52. doi: 10.1603/EN09049.
In a 3-yr study involving saltcedar-free, saltcedar-infested, and burned habitats in a riparian area at Lake Meredith, TX, the number of carabid species collected, diversity indices, and indicator species varied significantly among habitats. A 3-yr average of 15, 14, and 24 carabid species were collected from the saltcedar-free, saltcedar-infested, and burned habitats, respectively. Values for species richness, Shannon's and Simpson's diversity indices, and evenness index for pooled data collected from 2005 to 2007 were higher in the burned habitat followed by the saltcedar-free habitat and the saltcedar-infested habitat. Within-year parameters across the three habitats generally followed the pooled data results with some variation. Nonmetric multidimensional scaling analyses clearly indicated groups of carabid species preferred specific habitats. Five species in the burned area had indicator species percentage values >50% (Agonum punctiforme, Agonum texanum, Brachinus alternans, Harpalus pensylvanicus, and Poecilus chalcites). In the saltcedar-infested and saltcedar-free habitats, only one species in each habitat had indicator species percentage values that exceeded 50%: Calathus opaculus and Cicindela punctulata punctulata, respectively.
在得克萨斯州梅雷迪思湖河岸地区进行的一项为期3年的研究中，涉及无柽柳、有柽柳侵扰和被火烧过的栖息地，所采集的步甲物种数量、多样性指数以及指示物种在不同栖息地之间存在显著差异。从无柽柳、有柽柳侵扰和被火烧过的栖息地分别采集到的步甲物种的3年平均数量分别为15种、14种和24种。2005年至2007年收集的汇总数据的物种丰富度、香农多样性指数、辛普森多样性指数和均匀度指数值在被火烧过的栖息地最高，其次是无柽柳栖息地和有柽柳侵扰的栖息地。三个栖息地的年内参数总体上遵循汇总数据的结果，但存在一些差异。非度量多维标度分析清楚地表明步甲物种群偏好特定的栖息地。在被火烧过的区域，有5个物种的指示物种百分比值>50%（点状粒龙虱、德克萨斯粒龙虱、交替步甲、宾夕法尼亚婪步甲和铜绿步甲）。在有柽柳侵扰的栖息地和无柽柳栖息地，每个栖息地分别只有1个物种的指示物种百分比值超过50%，分别为暗黑步甲和点斑虎甲指名亚种。
