Impact of damming on the Chironomidae of the upper zone of a tropical run-of-the-river reservoir

Brandimarte, Ana Lúcia; Anaya, M.; Shimizu, Gisela Yuka

doi:10.1590/1519-6984.16814

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…Chironomids abundant in the habitats containing detritus act as a link between producers and consumers (Brandimarte et al, 2016; Henriques‐Oliveira et al, 2003). The vegetation of the littoral marginal zone may have enhanced the detritus composition in its habitat during the inundated period.…”

Section: Discussionmentioning

confidence: 99%

Seasonal water‐level fluctuations and changes in macro‐benthic community structure in tropical reservoirs: A Sri Lankan case study

2021

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Seasonal water‐level fluctuations (WLFs) in reservoirs influence ecological processes, in turn affecting their benthic macroinvertebrate communities. The present study was carried out in 10 irrigation reservoirs of Sri Lanka to investigate the effects of seasonal WLFs on the benthic macroinvertebrate fauna. The study period was divided into two distinct phases: the drained period and the inundated period. Benthic macroinvertebrates were sampled during both periods and enumerated. Air temperature and soil quality parameters were also measured simultaneously, and hydrological data related to the Kala Oya River basin were obtained from irrigation authorities. Data analysis using non‐metric multi‐dimensional scaling revealed two distinct reservoir groups, namely, Hydrological Stress Group 1 (HSG1) and Hydrological Stress Group 2 (HSG2). A low hydrological residence time and low relative reservoir level fluctuations (RRLF) characterized HSG1, with the opposite describing HSG2. Temporal variations of macrobenthos indicated a high taxa richness and diversity in HSG1 reservoirs during the drained period, with scrapers and collector‐gatherers being the dominant functional feeding groups. Reservoirs in the lower river basin (HSG1) exhibited a high taxa richness and diversity. During the inundated periods, insect taxa colonized, particularly, chironomids and ephemeropterans. Molluscan taxa were prominent during the drained periods. These observations highlight the influence of seasonal fluctuations of reservoir water levels on benthic macroinvertebrates. Benthic macroinvertebrate communities in reservoirs were significantly influenced by the RRLF, manifesting the importance of hydrological regimes in reservoirs to develop macroinvertebrate metrics for water‐quality monitoring.

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Section: Discussionmentioning

confidence: 99%

Seasonal water‐level fluctuations and changes in macro‐benthic community structure in tropical reservoirs: A Sri Lankan case study

2021

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Effects of an atypical drought on the benthic macroinvertebrate community in a tropical reservoir

et al. 2018

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Atypical drought events have increasingly occurred in Brazil over the last years due to global climate changes. However, their consequences on aquatic biota in reservoirs are poorly known. We tested the hypothesis that macroinvertebrate communities are negatively affected by atypical drought events, given the sensitivity of many taxa to environmental changes. We predicted that: (a) there would be changes in limnological and sediment parameters between a regular year and an atypical year, (b) abundance and richness of the genera of Chironomidae and of exotic species would be higher due to the enhanced ability of these organisms to adapt to changes in the physical environment, and (c) community structure metrics (i. richness; ii. % richness; iii. abundance; iv. % abundance) would be affected by disturbance indices (i. Buffer Disturbance Index-BDI; ii. Local Disturbance Index-LDI; iii. Integrated Disturbance Index-IDI) in both years. The study was carried out in the reservoir of the Nova Ponte Hydroelectric Power Plant, state of Minas Gerais, comparing two sampling periods: a regular climatological year (2010) and an atypical drought year (2014). A total of 40 sampling sites were defined along the shore of the reservoir, and types of land use in the surrounding area of each site were measured, as well as physical habitat conditions, sediments, and benthic macroinvertebrate communities. Sampling was performed at these sites in the end of the rainy season in both years. The intensity of anthropogenic modifications was assessed at local scale and in the areas (buffers) surrounding the sampling sites using quantitative disturbance indices. There were striking differences in limnological parameters and sediment characteristics between sampling periods. Taxonomic richness was significantly lower in the drought year. As opposed to our predictions, richness and abundance of Chironomidae and exotic species did not increase with the atypical drought event. Besides, most community structure metrics showed a significant relationship with disturbance indices only during the regular climatological year, thus indicating that the large-scale effects of water stress may override the conditions of local habitats and the surrounding landscape. Therefore, in addition to a correct political-environmental management of water resources at local-scale, which includes maintaining the water quality and the riparian and landscape integrity, addressing large-scale climate issues is required for the maintenance of the ecological integrity of tropical reservoirs.

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Impact of damming on the Chironomidae of the upper zone of a tropical run-of-the-river reservoir

Cited by 2 publications

References 18 publications

Seasonal water‐level fluctuations and changes in macro‐benthic community structure in tropical reservoirs: A Sri Lankan case study

Seasonal water‐level fluctuations and changes in macro‐benthic community structure in tropical reservoirs: A Sri Lankan case study

Effects of an atypical drought on the benthic macroinvertebrate community in a tropical reservoir

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