Abstract
Wetland water level fluctuations often influence benthic macroinvertebrate communities through changes in water quality, substrate, and macrophytes and, hence, affect the structure and function of aquatic ecosystems. However, there is lack of understanding on how water level fluctuations affect the structure and composition of benthic macroinvertebrates in subtropical shallow wetlands in Nepal. Here, we assessed the changes in benthic macroinvertebrate community composition in response to water level fluctuations and identified indicator taxa sensitive to such fluctuations. A study was conducted over 4 seasons covering one annual cycle of water level fluctuation in 4 wetlands of Koshi Tappu Wildlife Reserve, Nepal. The study revealed that benthic macroinvertebrate composition significantly differed across water levels. Dissimilarities in macroinvertebrate community composition were mainly attributed by families Atyidae, Dytiscidae, Baetidae, Planorbidae, Chironomidae, Bithyniidae, Sphaeriidae, and Thiaridae. Taxon specific richness, densities, and biomass varied across the water levels while no difference was documented for overall family richness, density, and biomass. Ephemeroptera and Trichoptera richness decreased when water levels were low while Coleoptera and Diptera richness increased. Medium water level supported high benthic macroinvertebrate diversity. Indicator taxa analysis identified Coleoptera: Hydrophilidae and Dytiscidae, Hemiptera: Pleidae, Diptera: Muscidae and Mollusca: Sphaeriidae, Viviparidae, and Thiaridae, as indicators of low water level. Similarly, Coleoptera: Scirtidae, Hemiptera: Micronectidae and Oligochaeta: Tubificidae as indicators of medium water level, and Trichoptera: Polycentropodidae and Ephemeroptera: Caenidae as indicators of high water level. Redundancy analysis identified water level as one of the most influencing factors in benthic macroinvertebrate community variation. Considering the significant response of benthic macroinvertebrates to water level fluctuations, they are important as ecological indicators in research aimed at developing environmental flow frameworks. Indicator species are likely to be a vital tool in environmental impact assessment and monitoring in relation to hydrological development. The outcomes of this research have important implications to conservation and management of wetlands to preserve the valuable ecosystem functions provided by wetlands.
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Acknowledgements
We are grateful to the Central Department of Environmental Science, Tribhuvan University for providing the laboratory facilities. We thank Mr. Kul Bahadur Thapa, Ms. Tika Regmi, and Mr. Aditya Pal for assisting in the field. We thank all colleagues for assisting in my laboratory work.
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This research was financially supported by the Australian government through its national science agency CSIRO-Commonwealth Scientific and Industrial Research Organisation and facilitated by Himalayan Nature, Nepal.
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Sunita Shrestha: field and laboratory work — data collection, curation, analysis; writing — original draft preparation, editing. Deep Narayan Shah: conceptualization, supervision, data analysis, writing — original draft, review, editing, and finalization. Ram Devi Tachamo-Shah: conceptualization, supervision, benthic macroinvertebrates identification, data analysis, writing — review and editing. Tanya Doody: conceptualization, project facilitation, writing — review and editing. Susan Cuddy: project facilitation, review and editing.
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Shrestha, S., Tachamo-Shah, R.D., Doody, T. et al. Establishing the relationship between benthic macroinvertebrates and water level fluctuation in subtropical shallow wetlands. Environ Monit Assess 193, 534 (2021). https://doi.org/10.1007/s10661-021-09225-5
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DOI: https://doi.org/10.1007/s10661-021-09225-5