Establishing the relationship between benthic macroinvertebrates and water level fluctuation in subtropical shallow wetlands.

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Tytuł:: Establishing the relationship between benthic macroinvertebrates and water level fluctuation in subtropical shallow wetlands.
Autorzy:: Shrestha S; Central Department of Environmental Science, Tribhuvan University, Kirtipur, Kathmandu, Nepal.
Tachamo-Shah RD; Aquatic Ecology Centre, Kathmandu University, Dhulikhel, Nepal.; Department of Life Sciences, School of Science, Kathmandu University, Dhulikhel, Nepal.
Doody T; Commonwealth Scientific and Industrial Research Organisation (CSIRO), Canberra, Australia.
Cuddy S; Commonwealth Scientific and Industrial Research Organisation (CSIRO), Canberra, Australia.
Shah DN; Central Department of Environmental Science, Tribhuvan University, Kirtipur, Kathmandu, Nepal. .
Źródło:: Environmental monitoring and assessment [Environ Monit Assess] 2021 Jul 29; Vol. 193 (8), pp. 534. Date of Electronic Publication: 2021 Jul 29.
Typ publikacji:: Journal Article
Język:: English
Imprint Name(s):: Publication: 1998- : Dordrecht : Springer
Original Publication: Dordrecht, Holland ; Boston : D. Reidel Pub. Co., c1981-
MeSH Terms:: Invertebrates*
Wetlands*
Animals ; Biodiversity ; Ecosystem ; Environmental Monitoring ; Humans ; Nepal ; Water
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Contributed Indexing:: Keywords: Aquatic habitats; Flow-ecology relationships; Hydrology; Hydropower; Koshi Tappu Wildlife Reserve; Nepal
Substance Nomenclature:: 059QF0KO0R (Water)
Entry Date(s):: Date Created: 20210730 Date Completed: 20210802 Latest Revision: 20210802
Update Code:: 20240105
DOI:: 10.1007/s10661-021-09225-5
PMID:: 34327569
: Czasopismo naukowe

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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.
(© 2021. The Author(s), under exclusive licence to Springer Nature Switzerland AG.)

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