科研之友
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摘要
The diversity of lakes, rivers and streams of flood plain sustains great taxonomic and functional diversity. The Bananal flood plain is located mainly in the State of Mato Grosso, in the southern region of the Cerrado Biome and north of the Cerrado-Amazonia transition zone, two very diverse ecosystems. In the present study, to test the hypothesis that composition, richness and functional groups would differ between regions (south and north), as well as between environments (lentic and lotic), always being greater in the northern area and in lotic environments, immature Ephemeroptera individuals were collected from 12 aquatic environments, 6 streams and 6 lakes, in the northern and southern regions of the plains. Composition differed only between regions; the richness of genera and the number of functional feeding groups was higher in the northern region, and did not differ between environments. The greater diversity in the northern region may be because of its location in the ecotone of two highly diverse ecosystems, whereas the similarity between the lentic and lotic environments may be because of the homogenisation temporarily caused by floods during the flood period, increasing fluvial connectivity. Knowledge of the diversity patterns in these inhospitable regions spatially minimises knowledge gaps and provides empirical evidence of the importance of areas such as the Cerrado-Amazon transition for conservation, as shown in the present study.
- 出版日期2017
