2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/25/2021 | 2:00 PM - 3:30 PM | DYNAMICS OF AN AQUATIC MACRO-INVERTEBRATE ASSEMBLAGE IN A SEASONAL FLOODPLAIN OF THE OKAVANGO DELTA, BOTSWANA | Virtual Platform
DYNAMICS OF AN AQUATIC MACRO-INVERTEBRATE ASSEMBLAGE IN A SEASONAL FLOODPLAIN OF THE OKAVANGO DELTA, BOTSWANA
Aquatic macroinvertebrates are a key component of primary production. Therefore, understanding their dynamics can contribute to knowledge of ecosystem dynamics in wetlands. Data used in this study were collected over one season in a seasonal floodplain of the Okavango Delta. Standardised sampling techniques were used to sample the aquatic macro-invertebrates. Multivariate and univariate techniques were used to assess their dynamics. 12846 specimens encompassing 49 families were collected during the study period. Corixidae, Coleoptera, Chironomidae, Planorbidae and Baetidae were the dominant groups in the assemblage, respectively. Chironomidae, Baetidae and Planorbidae populations fluctuated significantly (p<0.05) seasonally while Corixidae and Coleoptera populations had moderate (p<0.1) fluctuations. SIMPER analysis revealed shifts in macroinvertebrate assemblage along a hydrological gradient. CCA analysis revealed that an environmental gradient explained 88.8% of the variance in assemblage dynamics while Monte Carlo randomisation showed a significant relationship between assemblage dynamics and the environment. These results suggest that the seasonal flood pulse is a key driver of change in aquatic macro-invertebrate assemblages in the Delta. Water depth is the key driver of change in assemblage Stability (CV). Dynamic changes within the assemblage are driven primarily by Coleoptera and Corixidae populations
- Aquatic–terrestrial biodiversity
- Ecohydrology
- Ecological dynamics
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Presenters/Authors
Belda MOSEPELE
(), Botswana University of Agriculture and Natural Resources, bmosepele@buan.ac.bw;
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Ketlhatlogile MOSEPELE
(), Botswana University of Agriculture and Natural Resources, kmosepele@buan.ac.bw;
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Helen Dallas
(), Freshwater Research Centre and Nelson Mandela Metropolitan University, helen@frcsa.org.za;
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Keoikantse Sianga
(), Botswana University of Agriculture and Natural Resources, ksianga@buan.ac,bw;
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Montshwari Molefe
(), Aquaculture Division, Ministry of Agriculture and Food Secuity, molfkin@outlook.com;
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