Ferreira W R, Hepp L U, Ligeiro R, Macedo D R, Hughes R M, Kaufmann P R, Callisto M
Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Departamento de Biologia Geral, Laboratório de Ecologia de Bentos, Av. Presidente Antônio Carlos 6627, CP 486, CEP 30161-970, Belo Horizonte, Minas Gerais, Brasil.
Universidade Regional Integrada do Alto Uruguai e das Missões (URI), Av. Sete de Setembro, 1621, CEP 99709-910, Erechim, Rio Grande do Sul, Brasil.
Ecol Indic. 2017 Jan;72:365-373. doi: 10.1016/j.ecolind.2016.08.042.
Biological diversity can be divided into: alpha (α, local), beta (β, difference in assemblage composition among locals), and gamma (γ, total diversity). We assessed the partitioning of taxonomic diversity of Ephemeroptera, Plecoptera and Trichoptera (EPT) and of functional feeding groups (FFG) in neotropical savanna (southeastern Brazilian cerrado) streams. To do so, we considered three diversity components: stream site (α), among stream sites (β), and among hydrologic units (β). We also evaluated the association of EPT genera composition with heterogeneity in land use, instream physical habitat structure, and instream water quality variables. The percentage of EPT taxonomic α diversity (20.7%) was smaller than the β and β diversity percentages (53.1% and 26.2%, respectively). The percentage of EPT FFG collector-gatherer α diversity (26.5%) was smaller than that of β diversity (55.8%) and higher than the β (17.7%) diversity. The collector-gatherer FFG was predominant and had the greatest β diversity percentage among stream sites (β, 55.8%). Our findings support the need for implementing regional scale conservation strategies in the cerrado biome, which has been degraded by anthropogenic activities.
阿尔法（α，局部）、贝塔（β，不同局部之间组合组成的差异）和伽马（γ，总多样性）。我们评估了新热带稀树草原（巴西东南部塞拉多）溪流中蜉蝣目、襀翅目和毛翅目（EPT）的分类多样性以及功能摄食组（FFG）的划分情况。为此，我们考虑了三个多样性组成部分：溪流位点（α）、溪流位点之间（β）以及水文单元之间（β）。我们还评估了EPT属组成与土地利用异质性、溪流物理栖息地结构以及溪流水质变量之间的关联。EPT分类α多样性的百分比（20.7%）小于β和β多样性的百分比（分别为53.1%和26.2%）。EPT FFG收集者 - 采集者α多样性的百分比（26.5%）小于β多样性的百分比（55.8%）且高于β（17.7%）多样性。收集者 - 采集者FFG占主导地位，在溪流位点之间具有最大的β多样性百分比（β，55.8%）。我们的研究结果支持在已因人为活动而退化的塞拉多生物群落中实施区域尺度保护策略的必要性。
