Gómez-Anaya José Antonio, Novelo-Gutiérrez Rodolfo, Campbell William Bruce
Instituto de Ecología, A.C., Carretera Antigua a Coatepec 351, El Haya, 91070 Xalapa, Veracruz, Mexico.
Rev Biol Trop. 2011 Dec;59(4):1559-77. doi: 10.15517/rbt.v59i4.3420.
Evaluating components of landscape diversity is essential for the implementation of efficient conservation strategies. We evaluated the diversity of Odonata larval assemblages from the Coalcomán mountains (CM), Michoacán, Mexico, and related it to local (site-level) habitat variables. Larvae were collected from shores, riffles and pools in five streams, counted and identified to species, twice per season during 2005. The Shannon Diversity Index (H'), Margalef's Richness Index (R), Simpson's Index as a dominance measure (D) and Pielou's Equitability (J) were used to describe the assemblages, and Renyi's Diversity Profiles were used to order diversity. A Bray-Curtis Similarity Index (BC) was used to evaluate beta diversity. Theoretical richness was estimated using non-parametric and parametric methods. A Canonical Correspondence Analysis (CCA) was applied to explore the relationships of species with site-level environmental variables. A total of 12 245 larvae from 75 species, 28 genera and 8 families were recorded. Over all sites, the dominant species were Erpetogomphus elaps, Macrothemis pseudimitans and Argia pulla. The number of species per locality ranged from 18 to 36, and a high number of species (76%) occurred with relative abundances lower than 1%. A differential distribution of species and abundance in streams, time and strata was observed. Renyi's diversity profiles showed diversity was higher in spring and on shores. Most BC similarity values were smaller than 25%, indicating a high turnover rate in the CM. The high turnover rate reflects a differential distribution of the species along the altitudinal gradient, supporting the hypothesis of Mexico as a betadiverse country. According to the slope of Clench's curve, a reliable list of species was gathered. The CM larval assemblage is currently the largest reported for Mexico, and our results support previous proposals of the CM as a species-rich area for conservation.
评估景观多样性的组成部分对于实施有效的保护策略至关重要。我们评估了墨西哥米却肯州科阿尔科曼山脉（CM）蜻蜓目幼虫群落的多样性，并将其与当地（场地水平）栖息地变量相关联。2005年期间，每个季节从五条溪流的岸边、浅滩和水潭中采集幼虫两次，进行计数并鉴定到物种。使用香农多样性指数（H'）、马加莱夫丰富度指数（R）、作为优势度度量的辛普森指数（D）和皮洛均匀度指数（J）来描述群落，并使用雷尼多样性剖面来对多样性进行排序。使用布雷-柯蒂斯相似性指数（BC）来评估β多样性。使用非参数和参数方法估计理论丰富度。应用典范对应分析（CCA）来探索物种与场地水平环境变量之间的关系。共记录了来自75个物种、28个属和8个科的12245只幼虫。在所有场地中，优势物种为埃氏原箭蜓、拟仿大蜻和拉氏长尾春蜓。每个地点的物种数量从18种到36种不等，并且大量物种（76%）的相对丰度低于1%。观察到溪流、时间和地层中物种和丰度的差异分布。雷尼多样性剖面显示春季和岸边的多样性较高。大多数BC相似性值小于25%，表明CM的周转率很高。高周转率反映了物种沿海拔梯度的差异分布，支持了墨西哥是一个β多样性国家的假设。根据克兰奇曲线的斜率，收集了一份可靠的物种清单。CM幼虫群落目前是墨西哥报道的最大的群落，我们的结果支持了之前将CM作为物种丰富的保护区的提议。
