Ephemeroptera, Plecoptera and Trichoptera (EPT) functional feeding group responses to fine grain sediment stress in a river in the Eastern Cape, South Africa

Environmental Monitoring and Assessment
Frank Chukwuzuoke Akamagwuna, Oghenekaro Nelson Odume

Abstract

Sedimentation arising from agricultural run-offs, riparian habitat fragmentation and channel bank erosion has long been known to impair the structure and ecological functioning of stream and river ecosystems. This study examined the effects of fine sediment grain sizes on the functional feeding group structure of Ephemeroptera, Plecoptera and Trichoptera (EPT) in the Tsitsa River catchment in the Eastern Cape Province of South Africa. Fine sediments and EPT were sampled between August 2016 and April 2017 from eight selected sampling sites. The eight sites were classified into four groups in terms of fine sediments and turbidity to represent a gradient of sediment stress, with site groups 4 and 3 being less influenced and groups 2 and 1 as the highly influenced groups. EPT genera/species were assigned to five functional feeding groups (FFGs) and their responses to sediment stress assessed. The results of the study showed that of the five FFGs, four (i.e. collector-filterer, collector-gatherer, scraper/grazer and shredder) were significantly different between the four groups, separating the impacted groups from the less impacted groups. Redundancy analysis (RDA) showed that FFGs such as scraper/grazer, collector-gatherer and shre...Continue Reading

References

Mar 1, 1997·Environmental Management·P J WOOD, P D ARMITAGE
May 10, 2017·The Science of the Total Environment·Kate L MathersPaul J Wood
Oct 21, 2018·The Science of the Total Environment·Tinotenda MangadzeP William Froneman
Nov 24, 2019·The Science of the Total Environment·Tinotenda MangadzeTatenda Dalu

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