Urbanization modifies the original habitat and the biodiversity. Research throughout urban-rural gradients allows the monitoring of human activities on the biodiversity of native environments. Our aims were to a) record the diversity of edaphic coleopteran families and carabid species in native grassland remnants of urban, suburban and rural areas; b) identify potential taxa exclusively associated with urban and rural sites, respectively, or indifferent to such categorization; and c) compare the body sizes, wing morphology and trophic groups of carabid beetles in the three levels of urbanization. Our results showed that carabid species richness is higher in urban areas, but we found no difference in the number of families of edaphic coleopterans. One species, the eurytopic Argutoridius bonariensis, dominated in all areas; but in the suburban and rural areas it shared the dominance with stenotopic Argutoridius sp. N° 2. Carabid species assemblages did not exactly reflect the urban-rural gradient selected a priori. Regarding size variation, we found that large size species were more abundant in two urban sites; wing-dimorphic and apterous species were more abundant in urban areas. In reference to trophic groups, we recorded larger number of omnivores in the urban areas. We showed that some species can develop and survive in cities while others cannot, creating and sustaining a “new” urban ecosystem, with its own history, rules, dynamics and internal ecological memory.

中文翻译：

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布宜诺斯艾利斯东南部草原的最少故事：整个城乡梯度中甲壳类甲虫的生物多样性

城市化改变了原始栖息地和生物多样性。贯穿城乡梯度的研究可以监测人类对自然环境生物多样性的活动。我们的目标是：a）在城市，郊区和农村地区的原生草地残留物中记录食性鞘翅目科和腕类物种的多样性；b）分别确定分别与城市和乡村场所相关或与这种分类无关的潜在分类单元；c）在城市化的三个层次上比较甲壳虫的体型，翅膀形态和营养组。我们的结果表明，城市地区腕甲物种的丰富度较高，但我们发现无翅鞘翅目动物的科数没有差异。一种，eurytopic Argutoridius bonariensis，在所有领域都占据统治地位；但在郊区和农村，它与狭窄的Argutoridius sp。共享优势。N°2.甲足类物种的集合不能准确反映先验选择的城乡梯度。关于大小变化，我们发现在两个城市地点，大型物种更为丰富。在城市地区，翼形和畸形物种更为丰富。关于营养类群，我们在市区记录了更多的杂食动物。我们表明，某些物种可以在城市中发展和生存，而其他物种则不能，它们具有自己的历史，规则，动态和内部生态记忆，从而创造并维持一个“新的”城市生态系统。