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Tanzania River Scoring System (TARISS): a macroinvertebrate-based biotic index for rapid bioassessment of rivers

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dc.creator Kaaya, Lulu Tunu
dc.creator Day, Jenny
dc.creator Dallas, Helen Fiona
dc.date 2015-12-15T12:56:03Z
dc.date 2015-12-15T12:56:03Z
dc.date 2015-06-22
dc.date.accessioned 2021-05-03T13:36:17Z
dc.date.available 2021-05-03T13:36:17Z
dc.identifier LT Kaaya, JA Day & HF Dallas (2015) Tanzania River Scoring System (TARISS): a macroinvertebrate based biotic index for rapid bioassessment of rivers, African Journal of Aquatic Science, 40:2, 109-117, DOI:10.2989/16085914.2015.1051941
dc.identifier 1608-5914
dc.identifier http://hdl.handle.net/123456789/135
dc.identifier.uri http://hdl.handle.net/123456789/47594
dc.description The biological assessment of rivers using aquatic macroinvertebrates is an internationally recognised approach for the determination of riverine ecological conditions. In this study a Tanzanian macroinvertebrate-based biotic method, Tanzania River Scoring System (TARISS), was developed in 2012, based on the South African Scoring System (SASS). Macroinvertebrate samples were collected from 101 sites, including both reference and test sites, in the Pangani, Rufiji and Wami–Ruvu basins in the Pangani highlands and central eastern Africa ecoregions. TARISS modification involved adjustments of the list of taxa and the assigning of sensitivity weightings to three new families. Six SASS taxa were excluded and three new taxa were included, resulting in a total of 96 TARISS taxa. Assigned sensitivity weightings of the new taxa were: 10 for Dicercomyzidae, 9 for Ephemerythidae and 4 for Neritidae. Through validation, TARISS proved to be reliable in distinguishing reference from test sites, based on macroinvertebrate assemblages and TARISS metrics. The degree of reliability in distinguishing reference from test sites was higher when river types were used. TARISS scores and average score per taxon (ASPT) showed stronger correlations with the disturbance gradient, and were more reliable in distinguishing between reference and test sites than the number of taxa.
dc.publisher NISC (Pty) Ltd and Taylor & Francis
dc.subject method
dc.subject reference
dc.subject macroivertebrate taxa
dc.subject test
dc.subject validation
dc.subject disturbance gradient
dc.subject sensitivity weightings
dc.title Tanzania River Scoring System (TARISS): a macroinvertebrate-based biotic index for rapid bioassessment of rivers
dc.type Journal Article, Peer Reviewed


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