Chironomid assemblage structure and morphological response to pollution in an effluent-impacted river, Eastern Cape, South Africa

Odume, Oghenekaro Nelson; Palmer, Carolyn G.; Arimoro, Francis O.; Mensah, Paul

doi:10.1016/j.ecolind.2016.03.001

Cited by 37 publications

(18 citation statements)

References 26 publications

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“…This holistic view will make it possible to better understand the response of freshwater ecosystems to human activity, global warming, or the introduction of alien species. In the past, most aquatic biomonitoring studies assessed the incidence of indicator species (e.g., just chironomids, as Odume, Palmer, Arimoro, & Mensah, suggested), but not the whole community. Chironomids, like mites, are good indicators of water quality (Odume et al., ), and DNA barcoding has greatly improved their identification in the Baltic Sea (Brodin, Ejdung, Strandberg, & Lyrholm, ).…”

Section: Discussionmentioning

confidence: 99%

“…In the past, most aquatic biomonitoring studies assessed the incidence of indicator species (e.g., just chironomids, as Odume, Palmer, Arimoro, & Mensah, suggested), but not the whole community. Chironomids, like mites, are good indicators of water quality (Odume et al., ), and DNA barcoding has greatly improved their identification in the Baltic Sea (Brodin, Ejdung, Strandberg, & Lyrholm, ). However, the use of DNA barcodes in combination with light traps and improved specimen preservation makes it possible also to assess the entire zooplankton community.…”

Section: Discussionmentioning

confidence: 99%

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Improved protocols to accelerate the assembly of DNA barcode reference libraries for freshwater zooplankton

Elías‐Gutiérrez

Valdéz-Moreno

Topan

et al. 2018

Ecology and Evolution

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Currently, freshwater zooplankton sampling and identification methodologies have remained virtually unchanged since they were first established in the beginning of the XX century. One major contributing factor to this slow progress is the limited success of modern genetic methodologies, such as DNA barcoding, in several of the main groups. This study demonstrates improved protocols which enable the rapid assessment of most animal taxa inhabiting any freshwater system by combining the use of light traps, careful fixation at low temperatures using ethanol, and zooplankton‐specific primers. We DNA‐barcoded 2,136 specimens from a diverse array of taxonomic assemblages (rotifers, mollusks, mites, crustaceans, insects, and fishes) from several Canadian and Mexican lakes with an average sequence success rate of 85.3%. In total, 325 Barcode Index Numbers (BINs) were detected with only three BINs (two cladocerans and one copepod) shared between Canada and Mexico, suggesting a much narrower distribution range of freshwater zooplankton than previously thought. This study is the first to broadly explore the metazoan biodiversity of freshwater systems with DNA barcodes to construct a reference library that represents the first step for future programs which aim to monitor ecosystem health, track invasive species, or improve knowledge of the ecology and distribution of freshwater zooplankton.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Improved protocols to accelerate the assembly of DNA barcode reference libraries for freshwater zooplankton

Elías‐Gutiérrez

Valdéz-Moreno

Topan

et al. 2018

Ecology and Evolution

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“…The percentile distribution F I G U R E 1 Map of Nigeria showing Delta and Edo States, the sampling stations and rivers within the two states for each of the impact categories were 100-90th (LIS), <90th-50th (MIS), and <50th (HIS). A similar method has been used by Murphy, Davy-Bowker, McFarland, and Ormerod (2013) and Odume, Palmer, Arimoro, and Mensah (2016) to calculate species distances along the first axis of a canonical correspondence ordination plane (CCA). PCA ordination was performed using vegan package version 2.5.4 in R-statistics (Oksanen et al, 2019).…”

Section: Delineation Of Stations Along An Urban Impact Gradientmentioning

confidence: 99%

Developing and applying a macroinvertebrate‐based multimetric index for urban rivers in the Niger Delta, Nigeria

Edegbene

Arimoro

Odume

2019

Ecology and Evolution

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Urban pollution of riverine ecosystem is a serious concern in the Niger Delta region of Nigeria. No biomonitoring tool exists for the routine monitoring of effects of urban pollution on riverine systems within the region. Therefore, the aim of this study was to develop and apply a macroinvertebrate‐based multimetric index for assessing water quality condition of impacted urban river systems in the Niger Delta region of Nigeria. Macroinvertebrate and physicochemical samples were collected from 11 stations in eight river systems. Based on the physicochemical variables, the stations were categorized into three impact categories namely least impacted stations (LIS), moderately impacted stations (MIS) and heavily impacted stations (HIS). Seventy‐seven (77) candidate metrics were tested and only five: Hemiptera abundance, %Coleoptera + Hemiptera, %Chironomidae + Oligochaeta, Evenness index and Logarithm of relative abundance of very large body size (>40–80 mm) were retained and integrated into the final Niger Delta urban multimetric index (MINDU). The validation dataset showed a correspondence of 83.3% between the index result and the physicochemically‐based classification for the LIS and a 75% correspondence for the MIS. A performance of 22.2% was recorded for the HIS. The newly developed MINDU proved useful as a biomonitoring tool in the Niger Delta region of Nigeria and can thus be used by environmental managers and government officials for routine monitoring of rivers and streams subjected to urban pollution.

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“…In several laboratory and field studies, an association between environmental contamination level (metals, such as As, Cd, Cr, Cu, Hg, Mn, Ni, Pb, Zn, and organic compounds, such as polychlorinated biphenyls (PCBs) and pesticides) and the onset of sublethal effects as deformities of mouthparts (i.e., mentum, mandibles, and pectin epipharyngis) in chironomid larvae has been observed. In this regard, studies on chironomid mouthpart deformities have been developed since the 1970s [26][27][28] and a vast amount of literature based on laboratory bioassays [22,23,[29][30][31][32][33][34][35][36][37][38][39][40][41] and field surveys [21,[42][43][44][45][46][47] endorses that the incidence of these deformities is well associated with the degree of sediment toxicity, whereas no relationship has been detected between deformed phenotypes and organic enrichment; hence, the water quality assessment indices are not always consistent with the use of chironomid deformities [48]. However, some studies have expressed concerns about the association between deformity incidence and toxicants [24,49].…”

Section: Introductionmentioning

confidence: 99%

Use of Larval Morphological Deformities in Chironomus plumosus (Chironomidae: Diptera) as an Indicator of Freshwater Environmental Contamination (Lake Trasimeno, Italy)

Goretti

Pallottini

Pagliarini

et al. 2019

Water

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The mentum deformity incidence in Chironomus plumosus larvae to assess the environmental contamination level in Lake Trasimeno, Central Italy, was investigated. The survey lasted from May 2018 to August 2019. Fifty-one samplings were carried out: 34 in the littoral zone and 17 in the central zone. The deformity assessment was based on 737 and 2767 larval specimens of C. plumosus collected from the littoral and central zones, respectively. Comparison of the larval morphometric variables between normal and deformed specimens highlighted that the deformities did not cause alterations of the larval growth. The deformity incidence amounted to 7.22% in the whole Trasimeno’s ecosystem, reaching 8.28% in the littoral zone and 6.94% in the central zone. Among the different seasonal cohorts, the spring cohort had overall the highest deformity value (11.41%). The deformity type assessment protocol highlighted that the most common deformity type was “round/filed teeth” (64%). The results of this 2018–2019 survey revealed a low deformity incidence, within the background range of relatively low-impacted freshwaters. Comparison with previous investigations (2000–2010) of the same habitat showed a clear decrease of the deformity incidence. This study further contributes to the evaluation of the mentum deformity in chironomids that represent an indicator endpoint of the anthropogenic contamination level in freshwaters.

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Chironomid assemblage structure and morphological response to pollution in an effluent-impacted river, Eastern Cape, South Africa

Cited by 37 publications

References 26 publications

Improved protocols to accelerate the assembly of DNA barcode reference libraries for freshwater zooplankton

Improved protocols to accelerate the assembly of DNA barcode reference libraries for freshwater zooplankton

Developing and applying a macroinvertebrate‐based multimetric index for urban rivers in the Niger Delta, Nigeria

Use of Larval Morphological Deformities in Chironomus plumosus (Chironomidae: Diptera) as an Indicator of Freshwater Environmental Contamination (Lake Trasimeno, Italy)

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