Untitled

Koel, Todd M.; Stevenson, Kip E.

doi:10.1023/a:1016500324467

Cited by 16 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast to planktivore and herbivore groups, the invertivore fish assemblage of both natives and invaders (i.e., mostly common carp), was less biomass-dense than what might be expected for a large, benthos-dominated river. The dams and high sediment load of the lower Illinois River mainstem likely reduced benthic invertebrates 25 and favored planktivorous fishes over invertivorous ones. The consistent pattern of more efficient use of energy by invasive invertivores over native invertivores suggests a potential competitive benefit despite environmentally driven limits on biomass achieved within this trophic group.…”

Section: Discussionmentioning

confidence: 99%

“…Most wetland backwater areas in the river are isolated from the mainstem by a system of levees. Wetlands that are connected are threatened by high silt and organic matter settling out from suspended river bedload 25 . In contrast to the Alton and LaGrange Pools, Peoria Pool contains extensive lake-like areas that are adjacent and connected to the thalweg (Figure 1).…”

Section: Study Systemmentioning

confidence: 99%

See 1 more Smart Citation

Trophic Dominance by an Assemblage of Invasive Fishes in a Large River

Garvey¹,

Glover

Coulter

et al. 2023

Preprint

View full text Add to dashboard Cite

Invasive species and climate change are accelerating changes in biodiversity. Predicting these changes is difficult, especially in large rivers which are hotspots of freshwater biodiversity and important dispersal corridors for aquatic organisms. The lower Illinois River is a major dispersal corridor between the Mississippi River watershed and the North American Great Lakes. The mainstem of this river is highly modified for navigation and may serve as a refuge for invasive species. We compared native and invasive fishes within trophic groups at the scale of an entire river to determine how invaders have risen to dominance. During fall 2012-2017, mainstem river fishes were sampled using standard gears and side-aspect, split-beam echosounding. Biomass and individual body sizes of fishes were used to estimate consumption. Whole-assemblage biomass and consumptive demand of herbivores, insectivores, planktivores, and piscivores were extrapolated from river segments to the entire 315-km main channel. The consumptive demand of native and invasive planktivores was simulated as a function of increasing river temperature and declining food quality. Across the entire fish assemblage, invaders dominated biomass but not species richness each year. Invasive and native fishes reached a fall-season maximum of 6,370 thousand tons and 2,942 thousand tons within the mainstem river, respectively. The total biomass of all but the piscivore trophic group was dominated by invasive fishes. Regardless of total assemblage biomass, invasive fishes had lower energy demand than natives, likely providing them a competitive advantage. Invasive planktivores required less energy than natives to compensate for both increased temperature and declining food quality. Assemblages of invasive species with large bodies and efficient energy consumption allow them to dominate trophic levels and spread into novel ecosystems.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Study Systemmentioning

confidence: 99%

Trophic Dominance by an Assemblage of Invasive Fishes in a Large River

Garvey¹,

Glover

Coulter

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Reference sites of the two basins were prominently located in riffles and undercut banks of stone substrates with subsequent waters of high DO and lower nutrient levels compared to fine substrate (gravel, sand and mud) of monitoring sites. These fine substrates contain loose sediments and decomposed organic matter of low DO, as a result, support only tolerant macroinvertebrate communities (Koel and Stevenson, 2002) compared to those accommodated by stone substrates. Heptageniidae and Baetidae (Ephemeroptera), Chironomidae (Diptera) and Hydropsychidae (Trichoptera) for example, can survive under serious environmental stresses with low DO waters because of their ability to oxidize mud on the river bottom and produce haemoglobin (Ikonomov, 1963;Simic, 1999;Paunovic et al, 2007).…”

Section: (C) Water Quality Status Of the Basinsmentioning

confidence: 99%

Development of a suitable pragmatic and cost effective biomonitoring method for assessing water pollution in tropical African rivers

Elias

View full text Add to dashboard Cite

The needs of tropical African countries to develop their own biomonitoring indices using local macroinvertebrates as opposed to adoption or relying on non-tropical indices in biomonitoring programmes for assessing freshwater pollution were discussed. The discussion build-up involved: (i) reviewing of existing indices from non-tropical regions and their adoption setbacks in assessing pollution in tropical African rivers; (ii) testing of key review findings in the field at a small scale and then at a wide scope by characterizing macroinvertebrates while examining environmental variables; (iii) assigning pollution sensitivity ratings of macroinvertebrates based on related scoring systems and the help of PRIMER7 software; (iv) determination of macroinvertebrates response towards nutrients loading, and; (v) developing suitable and cost-effective biomonitoring method. The review paper, pilot and detailed studies and toxicity test study were aimed at laying the groundwork needed to develop a simple, quick and advanced tropical biomonitoring tool for initial application on Tanzanian rivers. Collectively, ninety seven macroinvertebrate families belonging to seventeen orders were observed at 85 sampling stations, representing 46 reference and 39 monitoring sites along Tanzanian rivers. All observed orders were subjected to six stepwise criteria to identify the one with a potential of discriminating reference from monitoring sites. The criteria include: numerical truncate test, Mann-Whitney test, inter-quartile overlap levels in Box-and-Whisker plots, Spearman rank correlation (rs) analysis, more diverse order (with > 10 taxa) and validation test. Ephemeroptera (E), Diptera (D), Odonata (O) and Trichoptera (T) orders that comprised the 55% (N = 97) of all Tanzanian families met all test criteria after being found with abundances > 2% upon truncate test, a p-value < 0.05 in a Mann-Whitney U test, a sensitivity score of 3, rs < 75% (with p < 0.005), higher number of taxa (n > 10) and separating reference from monitoring sites and thus, chosen to develop EDOT index. Being developed using only four and most diverse local orders, minimizes data variability, needs for great expertise and time in the field, the credibility that is not hitherto possessed by existing indices.

show abstract

A test of the association between Lake Habitat Quality Assessment and macroinvertebrate community structure

McGoff

Irvine

2009

Aquatic Conservation

View full text Add to dashboard Cite

ABSTRACT1. Lake Habitat Survey (LHS) provides a standard method for characterizing the physical habitat of lakes and reservoirs, but has not been tested for its relevance to the composition and abundance of macroinvertebrates. This study investigated the relationship between the metrics used in LHS and components of macroinvertebrate communities found in the littoral zone of a shallow calcareous lake in the west of Ireland.2. A scoring system, the Habitat Quality Assessment (HabQA), developed from the Lake Habitat Quality Assessment (LHQA) of the LHS, was used to assess the relationship between habitat quality based on physical structure within 10 LHS 'habplots' and metrics of the macroinvertebrate community.3. Macroinvertebrate taxon richness, both of adults found in the riparian zone and larvae found in the littoral zone, correlated positively with the HabQA score. Macrophytes within the littoral zone, and complexity of riparian vegetation within the riparian zone, were particularly important in driving the HabQA score. While overall abundance of macroinvertebrates did not vary with HabQA score, that of particular genera did.4. The HabQA score was a useful surrogate of taxon richness for adult and larval aquatic macroinvertebrates, suggesting that, in general, LHS provides a useful conservation assessment tool relevant for macroinvertebrates. However, in some circumstances, such as wave-washed stony substrates devoid of macrophytes, the HabQA score may not capture the quality of a site for macroinvertebrates, and the importance of natural but low diversity sites should not be neglected in conservation assessment of lakes. Similarly, while the LHS method notes the presence of alien species, further work on how these could be incorporated into the method would be useful.5. Reliance on a single, or overall combined, metric score across quality elements, whether based on biotic or structural assessment, has some potential limitations. It is clear that for conservation management a holistic assessment of naturalness, representativeness and species rarity needs to be made in conjunction with scoring systems.

show abstract

Untitled

Cited by 16 publications

References 21 publications

Trophic Dominance by an Assemblage of Invasive Fishes in a Large River

Trophic Dominance by an Assemblage of Invasive Fishes in a Large River

Development of a suitable pragmatic and cost effective biomonitoring method for assessing water pollution in tropical African rivers

A test of the association between Lake Habitat Quality Assessment and macroinvertebrate community structure

Contact Info

Product

Resources

About