scholarly journals Investigating the role of refuges and drift on the resilience of macroinvertebrate communities to drying conditions: An experiment in artificial streams

2018 ◽  
Vol 34 (7) ◽  
pp. 777-785 ◽  
Author(s):  
A. Doretto ◽  
E. Piano ◽  
E. Falasco ◽  
S. Fenoglio ◽  
M.C. Bruno ◽  
...  
Keyword(s):  
Macroinvertebrate Communities ◽  
Artificial Streams ◽  
Drying Conditions

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.

Do bare-nosed wombat (Vombatus ursinus) mounds influence terrestrial macroinvertebrate assemblages in agricultural riparian zones?

2009 ◽  
Vol 57 (5) ◽  
pp. 329 ◽  
Author(s):  
Philip Borchard ◽  
Ian A. Wright ◽  
Clare McArthur
Keyword(s):  
Canopy Cover ◽  
Soil Surface ◽  
Macroinvertebrate Communities ◽  
Riparian Ecosystems ◽  
Macroinvertebrate Assemblages ◽  
Ecological Variability ◽  
Eastern Australia ◽  
Surrounding Landscape ◽  
Study Sites

Riparian ecosystems contain a complex mosaic of habitat structure types that can support distinct macroinvertebrate communities. Bare-nosed wombats (Vombatus ursinus) are often an integral component of agricultural riparian systems in south-eastern Australia. In these systems, wombats construct large burrow systems and mounds in the stream banks. Wombat mound structures vary markedly from the surrounding landscape and they may influence macroinvertebrate assemblages. We examined this ecosystem-engineering role of wombats as well as the ecological variability within our agricultural riparian study sites on the possible influence on macroinvertebrate assemblages. There were no detectable effects of wombat mounds on the richness or abundance of macroinvertebrates on the soil surface. At the site level, however, macroinvertebrate assemblages were most influenced by litter depth, upper canopy cover, cattle hoof prints and slope. The ecological variables within the study sites strongly affected macroinvertebrate assemblages. These findings reflect an influence of anthropogenic impact on communities of ground-dwelling invertebrates that have been found in other studies. It is possible that a finer resolution of taxa may highlight a unique pattern of macroinvertebrate use of wombat mounds.

scholarly journals Relative Diversity and Community Structure of Ciliates in Stream Biofilms According to Molecular and Microscopy Methods

2009 ◽  
Vol 75 (16) ◽  
pp. 5261-5272 ◽  
Author(s):  
Andrew Dopheide ◽  
Gavin Lear ◽  
Rebecca Stott ◽  
Gillian Lewis
Keyword(s):  
Rflp Analysis ◽  
Molecular Techniques ◽  
Trophic Levels ◽  
Urban Stream ◽  
Macroinvertebrate Communities ◽  
Morphological Examination ◽  
Stream Biofilms ◽  
Sequences Analysis ◽  
Rrna Sequences

ABSTRACT Ciliates are an important component of aquatic ecosystems, acting as predators of bacteria and protozoa and providing nutrition for organisms at higher trophic levels. Understanding of the diversity and ecological role of ciliates in stream biofilms is limited, however. Ciliate diversity in biofilm samples from four streams subject to different impacts by human activity was assessed using microscopy and terminal restriction fragment length polymorphism (T-RFLP) analysis of 18S rRNA sequences. Analysis of 3′ and 5′ terminal fragments yielded very similar estimates of ciliate diversity. The diversity detected using microscopy was consistently lower than that suggested by T-RFLP analysis, indicating the existence of genetic diversity not apparent by morphological examination. Microscopy and T-RFLP analyses revealed similar relative trends in diversity between different streams, with the lowest level of biofilm-associated ciliate diversity found in samples from the least-impacted stream and the highest diversity in samples from moderately to highly impacted streams. Multivariate analysis provided evidence of significantly different ciliate communities in biofilm samples from different streams and seasons, particularly between a highly degraded urban stream and less impacted streams. Microscopy and T-RFLP data both suggested the existence of widely distributed, resilient biofilm-associated ciliates as well as ciliate taxa restricted to sites with particular environmental conditions, with cosmopolitan taxa being more abundant than those with restricted distributions. Differences between ciliate assemblages were associated with water quality characteristics typical of urban stream degradation and may be related to factors such as nutrient availability and macroinvertebrate communities. Microscopic and molecular techniques were considered to be useful complementary approaches for investigation of biofilm ciliate communities.

scholarly journals Water physicochemistry and benthic macroinvertebrate communities in a tropical reservoir: The role of water level fluctuations and water depth

Limnologica ◽  
2015 ◽  
Vol 55 ◽  
pp. 13-20 ◽  
Author(s):  
Francis S. Magbanua ◽  
Nikki Yvette B. Mendoza ◽  
Christine Jewel C. Uy ◽  
Christoph D. Matthaei ◽  
Perry S. Ong
Keyword(s):  
Water Level ◽  
Water Depth ◽  
Water Level Fluctuations ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Tropical Reservoir

The effect of vertebrate predation on lotic macroinvertebrate communities in Québec, Canada

1986 ◽  
Vol 64 (9) ◽  
pp. 1930-1936 ◽  
Author(s):  
Seth R. Reice ◽  
Robert L. Edwards
Keyword(s):  
Brook Trout ◽  
Fish Predation ◽  
Macroinvertebrate Communities ◽  
Benthic Community Structure ◽  
Third Order ◽  
Normal Complement ◽  
Small Streams ◽  
Previous Contact ◽  
Eurycea Bislineata

To test the role of vertebrate predation on benthic community structure, experiments were performed in two third-order streams in northern Québec, Canada. Predators were either enclosed in or excluded from replicate benthic cages (20 × 30 × 10 cm). Ruisseau du Cran Carré (RCC) has a normal complement of fish, while Low Hope Creek (LHC) is fishless. In June 1983, two species of fish were manipulated (one fish per cage, five replicate cages per treatment) in RCC, while the salamander Eurycea bislineata was manipulated in LHC. In August 1983, brook trout fry were manipulated in both streams. It was anticipated that the fauna in LHC, having had no previous contact with fish, would be more susceptible to fish predation than the fauna of RCC. Gut analysis revealed that fish did feed in the cages. However, neither fish predation nor salamander predation had significant effects on prey communities in either stream in June. Community parameters (species richness and diversity, and total numbers of individuals) were not influenced by the presence or absence of fish or salamanders. In August, three-quarters of the taxa were more abundant without trout than with trout. However, few individual taxa were significantly affected by the fish. This effect was similar in both streams. By enclosing fish in a fishless stream, this experiment was designed to enhance the possible effects offish predation on the lotic macrobenthic community. This work strengthens the idea that brook trout are not major structuring agents of the macrobenthic communities of small streams.

On the micro- and mesoporosity of carbon aerogels and xerogels. The role of the drying conditions during the synthesis processes

2012 ◽  
Vol 181-182 ◽  
pp. 851-855 ◽  
Author(s):  
Esteban Gallegos-Suárez ◽  
Agustín F. Pérez-Cadenas ◽  
Francisco J. Maldonado-Hódar ◽  
Francisco Carrasco-Marín
Keyword(s):  
Carbon Aerogels ◽  
Drying Conditions

Caddisflies (Trichoptera) in benthic communities of southern Sakhalin rivers, Far East Russia

Zoosymposia ◽  
2016 ◽  
Vol 10 (1) ◽  
pp. 493-501
Author(s):  
LYUBOV L. ZHIVOGLYADOVA ◽  
VYACHESLAV S. LABAY
Keyword(s):  
River Basin ◽  
Benthic Communities ◽  
Far East ◽  
Macroinvertebrate Communities ◽  
Southern Sakhalin ◽  
East Russia ◽  
One Year ◽  
Density And Biomass ◽  
Macroinvertebrate Density

During one year we studied caddisfly assemblages in benthic macroinvertebrate communities of mountain (Frikena River) and piedmont (Partizanka River) reaches of the Lyutoga River Basin. For most of the year in the mountain reaches, the scraper Neophylax ussuriensis Martynov dominates. Maximum caddisfly density (403 ind./m2) and biomass (14,441 g/m2) was recorded in July before mass emergence of that dominant species. The density of caddisflies in the benthic community was more significant in November (32%), and caddisfly biomass was most significant in July (69%). In the piedmont reaches of Lyutoga River Basin in various seasons, Rhyacophila (Hyporhyacophila) sp., Hydatophylax sp., Hydropsyche orientalis Martynov, and Stenopsyche marmorata Navás dominated. Maximum density and biomass of caddisflies (451 ind./m2, 1,576 g/m2) were recorded in 5 September. The density of filterers H. orientalis and S. marmorata occurs in the salmon spawning season and seems to be correlated with the increased abundance of suspended organic substances in the water column as salmon spawn. In the piedmont reaches the role of caddisflies are the most significant in September (49% of total macroinvertebrate density and 56% of biomass).

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