Impact of Dewatering on the Spatio-Temporal Distribution of Benthic Macroinvertebrate Communities in the Okpara River, Benin  

作　　者：Sylvain Tayéwo Biaou Fadéby Modeste Gouissi Armelle Sabine Yélignan Hounkpatin Zoulkanerou Orou Piami Wakili Bolatito Yessoufou Souradjou Orou Goura Nonvignon Martial Fassinou Sylvain Tayéwo Biaou;Fadéby Modeste Gouissi;Armelle Sabine Yélignan Hounkpatin;Zoulkanerou Orou Piami;Wakili Bolatito Yessoufou;Souradjou Orou Goura;Nonvignon Martial Fassinou(Laboratory of Ecology, Health and Animal Production (LESPA), Faculty of Agronomy (FA), University of Parakou (UP), Parakou, Benin;Pluridisciplanary Research Laboratory for Technical Education (LARPET), University of Sciences, Technologies, Engineering and Mathematics of Abomey (UNSTIM), Lokossa, Benin)

机构地区：[1]Laboratory of Ecology, Health and Animal Production (LESPA), Faculty of Agronomy (FA), University of Parakou (UP), Parakou, Benin [2]Pluridisciplanary Research Laboratory for Technical Education (LARPET), University of Sciences, Technologies, Engineering and Mathematics of Abomey (UNSTIM), Lokossa, Benin

出　　处：《Journal of Geoscience and Environment Protection》2024年第2期30-43,共14页地球科学和环境保护期刊（英文）

摘　　要：Surface watercourses are areas of very high ecological and heritage value. Macroinvertebrates are bioindicators of the health of aquatic ecosystems. The aim of this study was to assess the effects of dewatering and re-watering cycles on benthic macroinvertebrate (BMI) communities. Two data collections were carried out at two stations (Okpara 1 and Okpara 2) on the Okpara river before and after dewatering. Thus, 8 samples of benthic macroinvertebrates and 12 physico-chemical parameters (T°C, pH, Transparency, Depth, Conductivity, Dissolved Oxygen that were measured in situ, and BOD5, COD, NH₄⁺, NO₃^-, NO₂^- and PO₄^3-) were assayed in the laboratory. Canonical Correspondence Analysis (CCA) was used to match physico-chemical data to MIB families. Shannon and Piélou diversity indices were used to determine the effects of dewatering on MIBs. The increase in temperature values of pH, BOD5, COD, NH4</sub>+</sup>, NO3</sub>-</sup>, NO2</sub>-</sup> and PO4</sub>3-</sup>, after re-watering indicates the effect of dewatering on the quality of Okpara aquatic ecosystems. The benthic macrofauna collected consisted of 62.42% insects, 0.65% crustaceans, 6.48% molluscs, 0.72% worms and 0.14% arachnids. Whereas after re-watering, 21.67% insects, 0% crustaceans, 0.22% molluscs, 7.56% worms and 0.29% arachnids were recorded. Insects, crustaceans and molluscs were more abundant before dewatering than after. This was revealed by low abundances and taxonomic richness, as well as low Shannon index values of samples collected after re-watering.Surface watercourses are areas of very high ecological and heritage value. Macroinvertebrates are bioindicators of the health of aquatic ecosystems. The aim of this study was to assess the effects of dewatering and re-watering cycles on benthic macroinvertebrate (BMI) communities. Two data collections were carried out at two stations (Okpara 1 and Okpara 2) on the Okpara river before and after dewatering. Thus, 8 samples of benthic macroinvertebrates and 12 physico-chemical parameters (T°C, pH, Transparency, Depth, Conductivity, Dissolved Oxygen that were measured in situ, and BOD5, COD, NH₄⁺, NO₃^-, NO₂^- and PO₄^3-) were assayed in the laboratory. Canonical Correspondence Analysis (CCA) was used to match physico-chemical data to MIB families. Shannon and Piélou diversity indices were used to determine the effects of dewatering on MIBs. The increase in temperature values of pH, BOD5, COD, NH4</sub>+</sup>, NO3</sub>-</sup>, NO2</sub>-</sup> and PO4</sub>3-</sup>, after re-watering indicates the effect of dewatering on the quality of Okpara aquatic ecosystems. The benthic macrofauna collected consisted of 62.42% insects, 0.65% crustaceans, 6.48% molluscs, 0.72% worms and 0.14% arachnids. Whereas after re-watering, 21.67% insects, 0% crustaceans, 0.22% molluscs, 7.56% worms and 0.29% arachnids were recorded. Insects, crustaceans and molluscs were more abundant before dewatering than after. This was revealed by low abundances and taxonomic richness, as well as low Shannon index values of samples collected after re-watering.

关 键 词：DEWATERING Benthic Macroinvertebrates IMPACT Physico-Chemical Parameters Okpara Rivers Nord-Benin 

分 类 号：Q95[生物学—动物学]