Seasonal and spatial variations in benthic macroinvertebrate communities of Magela Creek, Northern Territory

1988 ◽  
Vol 39 (2) ◽  
pp. 211 ◽  
Author(s):  
PM Outridge
Keyword(s):  
Organic Matter ◽  
Standing Crop ◽  
Microbial Respiration ◽  
Benthic Communities ◽  
Northern Territory ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Wet Season ◽  
Perennial Stream ◽  
Seasonal And Spatial Variations

This study examined seasonal and spatial patterns of benthic macroinvertebrate communities in four billabongs and a perennial stream riffle in the Magela Creek catchment, Northern Territory. Chironomids, coleopterans, trichopterans and hydracarina were the most diverse and abundant taxa, although the mussel Velesunio angasi contributed over 98% of total standing crop in most billabongs. Diversity and standing crop were usually higher in littoral than in profundal areas of two shallow billabongs, probably because of the presence of macrophytes. Diversity, abundance and biomass declined sharply over the dry season, from maxima in May-July to minima in December. Recovery in the early wet season was rapid, commencing after the first creek flows in December. The decline and recovery were closely associated with the availability of sediment organic matter, which reflected inputs of mainly allochthonous (terrestrial) detritus over the wet season followed by losses due to intense microbial breakdown. Microbial respiration also seemed related to declines in benthic communities in the latter half of the wet season, by producing hypolimnetic anoxia during periods of reduced creek flow.

The effect of thermal effluent, before and after macrophyte harvesting, on standing crop and species composition of benthic macroinvertebrate communities in Lake Wabamun, Alberta

1982 ◽  
Vol 60 (12) ◽  
pp. 3196-3205 ◽  
Author(s):  
Joseph B. Rasmussen
Keyword(s):  
Species Composition ◽  
Benthic Macroinvertebrates ◽  
Standing Crop ◽  
Tubifex Tubifex ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Plant Detritus ◽  
Chironomid Species ◽  
Before And After ◽  
Heated Area

The heated area of Lake Wabamun prior to macrophyte harvesting had higher submerged macrophyte production, greater amounts of plant detritus in the sediment, and a higher standing crop of benthic macroinvertebrates than the unheated area. Species composition of the benthic macroinvertebrate community was also much different in the heated area with the warmest areas supporting a community dominated by tubificid oligochaetes (Limnodrilus hoffmeisteri and Tubifex tubifex), and the moderately heated areas supporting a community dominated by large Chironomus species (Chironomus plumosus and Chironomus atroviridis). Benthos of the unheated parts of the lake consisted mainly of smaller chironomid species such as Chironomus maturus, C. (cf.) staegeri, Polypedilum nubeculosum, Cladotanytarsus spp., and Tanytarsus spp. The heated area was subjected to mechanical macrophyte harvesting which removed the majority of the submerged macrophytes. This reduced the amount of plant detritus within the sediment and also the standing crop of benthic macroinvertebrates in the heated area. Species composition of the oligochaete-dominated community was not affected by harvesting. Species composition of the Chironomus-dominated area was greatly affected by harvesting and became more similar to that of the unheated area; densities of the large Chironomus species were reduced to low levels, while the densities of smaller chironomid species increased.

scholarly journals Interannual Variation of Benthic Macroinvertebrate Communities at Long-Term Monitoring Sites Impacted by Human Activities: Implications for Bioassessment

Diversity ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 167
Author(s):  
Almudena L. Idígoras Chaumel ◽  
David G. Armanini ◽  
John A. Schwindt ◽  
Adam G. Yates
Keyword(s):  
Interannual Variation ◽  
Environmental Changes ◽  
Benthic Communities ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Taxa Richness ◽  
Ecological Conditions ◽  
Community Persistence ◽  
Sampling Procedures ◽  
Thames River

Bioassessment assumes that ecological conditions remain stable in the absence of environmental changes. Evidence suggests this assumption may hold for reference streams, but knowledge gaps remain for impacted streams. Our study quantified interannual variation of benthic macroinvertebrate communities, monitored for at least 14 years in eight impacted streams in the Upper Thames River watershed in Ontario, Canada. Benthic communities exhibited moderate interannual variation in relative abundance of EPT (Ephemeroptera, Plecoptera and Trichoptera) and Chironomidae taxa. Year-to-year changes were reflected in lower community persistence than that observed in studies of reference streams. In contrast, tolerance-based metrics showed minimal interannual variation, suggesting compositional changes were because of taxonomic substitutions, in which one tolerant taxon replaced another. Analyses indicated limited directionality in temporal variation for most bioassessment metrics. An exception was taxa richness, which increased at most sites, possibly because of changes in subsampling. However, no associations between calculated bioassessment metrics and measured environmental factors (stream flow and water chemistry) or sampling procedures were observed. We conclude interannual variation in ecological conditions can be substantial and may not be associated with deterministic factors routinely measured in stream assessments. We recommend increased sampling frequency and traits-based assessment as options for limiting effects of interannual variation on assessment results.

Characterization and variations of dissolved organic matter in the Lake Taihu area of China

2012 ◽  
Vol 12 (4) ◽  
pp. 439-450
Author(s):  
Yong Qiu ◽  
Hanchang Shi ◽  
He Jing ◽  
Rui Liu ◽  
Qiang Cai ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Surface Water ◽  
Dissolved Organic Matter ◽  
Lake Taihu ◽  
Surface Water Quality ◽  
Spatial Variations ◽  
Nutrient Concentrations ◽  
Wet Season ◽  
Seasonal And Spatial Variations

Lake Taihu in China is a eutrophicated lake surrounded by industrial and urbanized zones, thus its water quality often suffers from organic and nutrient contaminants. In this paper, a 1 year water quality survey was conducted around the lake and statistical analysis tools were used to characterize the variations of organic pollutants. Analysis of variance (ANOVA), cluster analysis and principal component analysis (PCA) confirm the seasonal and spatial variations of surface water quality in Lake Taihu. Surface water quality is better during the wet season and worse downstream during the dry season. The dissolved organic matter was further analyzed using a parallel factor analysis (PARAFAC) model with three-dimensional excitation-emission fluorescence matrices. Four components were extracted from the fluorescence data, namely, two autochthonous biodegradation products (C1: amino acids, C4: protein-like materials) and two humic-like substances (C2: from microbial processing, C3: terrestrial). C1 and C4 were dominant in the chromophoric dissolved organic matter (CDOM) fluorophores; this result is similar to those of other inland water bodies in China. The CDOM fluorophores showed similar seasonal and spatial variations with common water quality indices, with the exception of the seasonal responses of C2 in winter. Bivariance correlations between the organic and nutrient concentrations and the fluorescence intensities of the CDOM fluorophores imply possible common sources of the different contaminants. This paper exemplifies advanced statistical methods as a useful tool in understanding the behavior of contaminants in inland fresh water systems.

scholarly journals Influence of environmental factors on benthic macroinvertebrate communities of urban streams in Vereda habitats, Central Brazil

2012 ◽  
Vol 23 (3) ◽  
pp. 293-306 ◽  
Author(s):  
Renata de Moura Guimaraes Souto ◽  
Kátia Gomes Facure ◽  
Luis Alfredo Pavanin ◽  
Giuliano Buzá Jacobucci
Keyword(s):  
Urban Area ◽  
Urban Areas ◽  
Benthic Communities ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Oil And Grease ◽  
Cerrado Biome ◽  
Sediment Size ◽  
Physical And Chemical Variables ◽  
Physical And Chemical

AIM: Veredas and the aquatic and semi-aquatic communities play a key role in watershed protection in the Cerrado Biome. Information about the effects of physical and chemical variables and habitat integrity on benthic communities has been increased in recent years; however, there is no study evaluating the influence of urbanization on macroinvertebrates of Vereda streams. Thus, improving the knowledge of the relationship between abiotic properties and benthic fauna is very important for understanding the functioning of ecological processes and health of aquatic ecosystems. This study investigated the influence of physical and chemical variables on benthic macroinvertebrate communities along a gradient of anthropogenic disturbance in four Vereda streams in Uberlândia (MG), one in a preserved area and three in the urban area; METHODS: samplings were collected during the dry and rainy seasons; RESULTS: principal component analysis separated the stream in the preserved area from those in the urban area by having lower values of BOD, COD, sediment size, conductivity, detergents, pH, deposited solids and total dissolved solids. Pollution sensitive groups (e.g., Ephemeroptera and Trichoptera) were associated to the stream in the preserved area, and more tolerant groups (e.g., Chironomidae and Oligochaeta) had greater abundance in the streams of the urban area. Canonical Correspondence Analysis indicated that dissolved oxygen, conductivity, BOD, oil and grease, and turbidity explained 56% of the variance in the distribution and abundance of macroinvertebrates; CONCLUSIONS: Benthic communities of Vereda streams in urban areas in the Cerrado Biome seem to be highly affected by human activities that increase water organic pollution and sedimentation.

The Influence of Benthic Biota on Copper Speciation and Distribution in Freshwater-Sediment Systems

1981 ◽  
Vol 16 (1) ◽  
pp. 45-58 ◽  
Author(s):  
G. Krantzberg ◽  
P.M. Stokes
Keyword(s):  
Freshwater Sediment ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Copper Species ◽  
Copper Speciation ◽  
Physico Chemical ◽  
Macro Benthos

Abstract An investigation was made of the effects exerted by benthic macroinvertebrate communities on copper speciation in sediments from a lake which is becoming acidified. In laboratory microcosms, benthic macroinvertebrate communities stimulated the flux of copper from sediment to water. The presence of the macro-benthos resulted in a redistribution of physico-chemical copper species within the sediment with a transfer from more strongly complexed forms (HC1 extractable) to adsorbed and cation exchangeable forms (MgCl2 extractable). The role of bio-turbation in copper transformations is discussed.

Responses of benthic macroinvertebrate communities in tropical Asian streams passing through an industrial zone

2021 ◽  
pp. 1-20
Author(s):  
Mark Edward Jolejole ◽  
Mylene G. Cayetano ◽  
Francis S. Magbanua
Keyword(s):  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Industrial Zone

Identifying Reference Conditions and Quantifying Biological Variability Within Benthic Macroinvertebrate Communities in Perennial and Non-perennial Northern California Streams

2013 ◽  
Vol 51 (6) ◽  
pp. 1262-1273 ◽  
Author(s):  
Kevin B. Lunde ◽  
Matthew R. Cover ◽  
Raphael D. Mazor ◽  
Christopher A. Sommers ◽  
Vincent H. Resh
Keyword(s):  
Reference Conditions ◽  
Benthic Macroinvertebrate ◽  
Northern California ◽  
Macroinvertebrate Communities ◽  
Biological Variability
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