del Rosario Ingaramo María, Etchepare Eduardo Gabriel, Alvarez Blanca Beatriz, Porcel Eduardo
Laboratorio de Herpetología, Facultad de Ciencias Exactas y Naturales y Agrimensura, Universidad Nacional del Nordeste, Av. Libertad 5470, Corrientes, Argentina.
Rev Biol Trop. 2012 Jun;60(2):759-69.
In recent decades, the concern for biodiversity conservation has increased in importance, especially due to the loss of highly biodiverse natural areas such as wetlands. Despite the high fauna diversity inhabiting the Iberá, the information about its composition, structure and dynamics is scarce, and amphibians are typical and conspicuous representatives of these Neotropical areas. To generate new information about this group, the amphibian composition from two villages (Paraje Galarza and Colonia Carlos Pellegrini), belonging to two different fitogeographic regions in the Eastern edge of the Iberá, were described and compared. Samples were taken, from a respective area of 100km2 that included five landscape units (wetlands, streams and swamps, grasslands, forest and a permanent/temporal pond) each, during the four seasons between January 2007 and March 2008. The techniques applied were the Complete Species Inventories (Unrestricted direct search) and Visual Encounter Surveys (VES). A total of 28 species were found, and represented the 70% of the previously registered taxa for the whole wetland. Scinax similis and Rhinella azarai were recorded for the first time in the Iberá Wetlands. No significant differences were found in the anuran specific richness between the surveyed villages, since the 95% of confidence intervals for the species accumulation curves were superimposed. In both villages, the wetlands, streams and swamps, and the permanent pond landscapes, showed the higher species richness when compared to the others. According to the Chao2, Jacknifel and ICE estimators, the inventory completeness of species, oscillated among 88% and 98% for the whole area. The dendrogram analysis based on the Jaccard similarity index, showed that wetlands, streams and swamps were grouped and well separated from grasslands. To guarantee the conservation of the high anuran richness that inhabit the Iberá Wetland, we recommend that representative areas of each landscape must be protected.
近几十年来，生物多样性保护受到的关注日益重要，尤其是由于湿地等生物多样性高度丰富的自然区域的丧失。尽管伊贝拉地区栖息着丰富的动物多样性，但关于其组成、结构和动态的信息却很匮乏，两栖动物是这些新热带地区的典型且显著的代表。为了获取关于这一群体的新信息，对伊贝拉东部边缘两个不同植物地理区域的两个村庄（帕拉耶·加拉尔萨和科隆尼亚·卡洛斯·佩莱格里尼）的两栖动物组成进行了描述和比较。在2007年1月至2008年3月的四个季节里，从各自100平方公里的区域采集样本，每个区域包括五个景观单元（湿地、溪流和沼泽、草原、森林以及永久性/临时性池塘）。应用的技术是完全物种清查（无限制直接搜索）和视觉相遇调查（VES）。共发现28个物种，占整个湿地先前记录分类单元的70%。斯氏琴蛙和阿扎拉蟾蜍首次在伊贝拉湿地被记录。在所调查的村庄之间，无尾目物种丰富度没有发现显著差异，因为物种积累曲线的95%置信区间相互重叠。在两个村庄中，与其他景观相比，湿地、溪流和沼泽以及永久性池塘景观显示出更高的物种丰富度。根据Chao2、Jacknifel和ICE估计器计算，整个区域物种清查的完整性在88%至98%之间波动。基于杰卡德相似性指数的聚类分析表明，湿地、溪流和沼泽被归为一组，与草原明显分开。为了确保保护栖息在伊贝拉湿地的高度丰富的无尾目动物，我们建议必须保护每个景观的代表性区域。
