scholarly journals Biodiversity in Riffles and Pools of the Mardi and the Vijaypur Streams, Pokhara, Nepal: Benthic Macroinvertebrate Communities

2013 ◽  
Vol 28 (1-2) ◽  
pp. 141-152
Author(s):  
Kishor K. Pokharel
Keyword(s):  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Invertebrate Communities ◽  
Taxa Richness ◽  
Riverine Environment

Macro invertebrate communities from September 2003 to August 2004were studied in riffles and pools of the Mardi and the Vijayapur streams, Pokhara, Nepal. A total of 47 genera (32 from the riffles and 34 from the pools) belonging to 38 families and 12 orders were recorded. The generic richness was lower (30 genera) in the Vijaypur stream than in the Mardi stream (38 genera). Ephemeropteran, dipterans, and trichopteran were found predominant orders comprising 11, 8 and 8 genera respectively. Heptagenids, baetids and leptophlebids; chironomids, ceratopagonids and tip lids and hydropsychids, psychomyids and polycentropodids were dominant sub-groups/families among ephemeropterans, dipterans and trichopterans respectively. The dominant genera were, Heptagenia, Rhithrogena and Baetis; Tendipes, Culicoids and Simulium;Hydropsyche and Psychomyia; Psephenus and Heterlimnius; Octogomphus and Argia and Planaria among ephemeropterans, dipterans, trichopterans, plecopterans, coleopherans, odonates and tricladids respectively. The tax occurred at both streams and sub-habitats were, Ephemera, Heptagenia, Rhithrogena, Ecdyonurus, Ephemerella, Baetis, Leptophlebia, Caenis; Tendipes, Culicoides, Simulium; Hydropsyche, Psychomyia, Psephenus, Heterlimnius and Planaria. Those occurred only in the Mardi stream (Site 1) were Habrophlebia, Siphlonurus; Glossosoma, Hydroptila, Leptocerus; Nemoura, Protonemura, Octogomphus, Argia and Gyraulus convexiculus, whereas, only in the Vijaypurstream (Site 2) were Centroptylum; Antocha, Psychoda, Tabanus, Agapetus and Ectopria. The lower taxa richness at the site having urban influence reflects perturbation of riverine environment due to urbanization and needs measures to control further deterioration.

scholarly journals Community structure of benthic macroinvertebrate fauna of river Ichamati, India

2018 ◽  
Vol 10 (8) ◽  
pp. 12044
Author(s):  
Arnab Basu ◽  
Indrani Sarkar ◽  
Siddartha Datta ◽  
Sheela Roy
Keyword(s):  
Benthic Community ◽  
Diversity Index ◽  
Abiotic Factors ◽  
Benthic Invertebrate ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Habitat Conditions ◽  
Invertebrate Communities ◽  
Benthic Invertebrate Communities ◽  
Hydrological Variables

Benthic macroinvertebrate communities are frequently applied as indicators of aquatic ecosystem health as many species are responsive to pollution and abrupt changes in their surroundings.  The qualities of benthic invertebrate communities greatly depend on habitat conditions.  Thus the diversity in benthic community varies with different habitat conditions.  This investigation on the structure of the benthic invertebrate communities was conducted on river Ichamati, a trans-boundary river between India and Bangladesh to assess the cumulative effects of water quality on the aquatic biota.  The study period extended from February 2011 to January 2014 at three sites from Majdiah to Hasanabad (in West Bengal, India) a stretch of 124km.  A total of 23 macrobenthic species belonging to three phyla, five classes and nine orders were identified.  Fifteen species of benthic invertebrates belonging to Mollusca, three species under Annelida and five species under Arthropoda were found.  The highest abundance density (3633.33 indiv.m-2) and species richness (18 species) were recorded up-stream (Majdiah) where marginal habitats covered by macrophytes were significantly higher than at other sites.  Both the organic carbon (4.41±1.11) and organic matter (7.48±1.56) of soil at this site were the maximum thus influencing the richness of benthic macroinvertebrate communities.  Hydrological variables, viz, dissolved oxygen, pH, alkalinity; hardness, salinity, nutrients, calcium, and magnesium were studied to determine their influences on the benthic community in the upper, middle- and down-streams of the river, respectively.  Shannon’s diversity index (0.95–2.07; 0.00–0.72; 0.00–0.64), dominance index (0.57–0.86; 0.00–0.44; 0.00–0.44), evenness index (0.72–0.95; 0.61–1.00; 0.00–1.00), Margalef index (0.72–2.23; 0.00–1.32; 0.00-0.28) of the upper, middle- and down-streams were calculated. Benthic macroinvertebrate density was correlated with hydrological variables which indicated that the abiotic factors had either direct or inverse influence on the richness and abundance; however, the abiotic factors did not correlate identically in all three sites. 

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.

Water level thresholds of benthic macroinvertebrate richness, structure, and function of boreal lake stony littoral habitats

2011 ◽  
Vol 68 (10) ◽  
pp. 1695-1704 ◽  
Author(s):  
Michael S. White ◽  
Marguerite A. Xenopoulos ◽  
Robert A. Metcalfe ◽  
Keith M. Somers
Keyword(s):  
Community Structure ◽  
Water Level ◽  
Macroinvertebrate Community ◽  
Functional Mobility ◽  
Water Level Fluctuations ◽  
Benthic Macroinvertebrate ◽  
Functional Composition ◽  
Macroinvertebrate Communities ◽  
Taxa Richness ◽  
Littoral Habitats

We investigated the role of water level fluctuation on benthic macroinvertebrate communities of stony littoral habitats located in the Boreal Shield Ecozone. Using the reference condition approach (RCA), regression analysis, nonmetric multidimensional scaling (NMDS), and analysis of variance (ANOVA), we analyzed the benthic macroinvertebrate community structure of 20 natural lakes and 28 hydroelectric reservoirs to determine if they are structured by change in water level (amplitude). Along a gradient of amplitude intensity, we found that taxa richness decreases with increasing amplitude (r2 = 0.47–0.60). Littoral benthic macroinvertebrate community structure is significantly different in reservoirs that experience amplitudes > 2.0 m. Out of 28 reservoirs, 13 fell outside the 95.5% confidence ellipse determined by 20 reference lakes. Functional mobility group and functional feeding group composition are also altered with increasing amplitude (nonparametric ANOVA, P < 0.05). Further, a change in benthic macroinvertebrate functional composition occurs after a change in taxa richness. Interestingly, reservoirs that experienced amplitudes < 2.0 m had benthic macroinvertebrate communities whose structural and functional composition is similar to lakes experiencing natural water level fluctuations.

scholarly journals Benthic Macroinvertebrate Communities in the Northern Tributaries of the “Iron Gates” Gorge (Danube River)

2014 ◽  
Vol 16 (3) ◽  
pp. 151-164
Author(s):  
Angela Curtean-Bănăduc
Keyword(s):  
Ecological Status ◽  
Danube River ◽  
Longitudinal Profile ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Negative Effects ◽  
Invertebrate Communities ◽  
Structural Variability ◽  
Good Ecological Status ◽  
The Town

Abstract The paper presents the structure of the benthonic macro-invertebrates communities in the Berzasca, Sirinia, Liubcova, and Mraconia rivers. The results are based on quantitative benthos samples (95 samples), collected in July 2014 from 19 sampling stations within the study area. In longitudinal profile, the benthonic macro-invertebrate communities of the Sirinia, Liubcova and Berzasca rivers displays relatively large structural variability, while the communities of the Mraconia River displays smaller structural variability. The structure of the benthonic macro-invertebrate communities correlated with the biotope characteristics indicates the good ecological status of the analysed rivers, with the exception of the Berzasca River sector downstream of the town of Berzasca and immediately upstream of the Danube junction, a sector with moderate ecological status due to negative effects from man-made modifications in the lotic biotope of the sector.

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.

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