scholarly journals POPULATION STRUCTURE AND DRIFTING PATTERN OF AQUATIC MITES IN RANDI GAD, A TRIBUTARY OF RIVER ALAKNANDA IN GARHWAL HIMALAYA, UTTARAKHAND, INDIA

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Pankaj Bahuguna ◽  
Anoop Kumar Dobriyal
Keyword(s):  
Population Structure ◽  
Current Velocity ◽  
Habitat Disturbance ◽  
Mite Species ◽  
Structure And Function ◽  
Mite Population ◽  
Garhwal Himalaya ◽  
Third Order ◽  
Stream Ecosystem ◽  
And Function

The present paper deals with the population structure and temporal drift pattern study of aquatic mites in Randi gad, which is a third order spring fed tributary of river Alaknanda in Garhwal, Uttarakhand, India. The mites contribute significantly to the structure and function of a stream ecosystem as it is a preferred food of fish and insects. To significantly analyze the drift strength of mites in a stream, a new index, Dobriyal Bahuguna Drifting Index (DBDI) has been developed which is based on the density of mite population in nature and number of drifting individuals in unit time. The maximum mite population in the stream was observed in January (51 units.m-2 ) and minimum in October (35 units.m-2 ) with 7 species. It was found that the mites perform specific monthly and diel drift pattern. Various factors like current velocity, breeding, colonization, habitat disturbance and protection from predators are responsible for it. The DBDI value for different mite species was observed highest in February (0.264) and minimum in November (0.227). It was also observed that maximum drift was preferred during late morning hours (8-12 hrs).

Modification of stream ecosystem structure and function by beaver (Castor canadensis) in the Adirondack Mountains, New York

1991 ◽  
Vol 69 (1) ◽  
pp. 55-61 ◽  
Author(s):  
Michael E. Smith ◽  
Charles T. Driscoll ◽  
Barbara J. Wyskowski ◽  
Carol M. Brooks ◽  
Christina C. Cosentini
Keyword(s):  
Structure And Function ◽  
Low Flow ◽  
Acid Neutralizing Capacity ◽  
Mountain Stream ◽  
Ecosystem Structure ◽  
Stream Ecosystem ◽  
Lotic Ecosystem ◽  
Neutralizing Capacity ◽  
And Function ◽  
Ecosystem Structure And Function

Stream ecosystem structure and function were studied in an acidic second-order Adirondack Mountain stream system with current beaver activity. Acid-neutralizing capacity, pH, dissolved organic carbon, Fe2+, and Mn2+ values were elevated and [Formula: see text], Aln−, and dissolved oxygen concentrations were decreased following water transport through the beaver impoundment. Upstream acidity was primarily ameliorated by [Formula: see text] and Fe retention in the impoundment during the low-flow summer period. High Fe and Al sediment concentrations were present during low-flow periods immediately downstream of the beaver dam. During the high-flow period, Fe and Al concentrations were highest 0.25 km downstream of the dam, owing to slow metal hydrolysis–oxidation kinetics during spring snowmelt. The immediate downstream site exhibited significantly lower invertebrate richness and diversity and collector–filterer, Plecoptera, and Trichoptera densities, but significantly higher total invertebrate, Diptera, Ephemeroptera, predator, and collector–gatherer densities. Significant differences were noted primarily during April and July. Our results indicate that beaver dams modify stream ecosystems longitudinally and temporally and ameliorate stream acidity. Current lotic ecosystem paradigms like the river continuum concept should incorporate "patch" occurrences such as those created by beaver.

scholarly journals Consumer return chronology alters recovery trajectory of stream ecosystem structure and function following drought

Ecology ◽  
2010 ◽  
Vol 91 (4) ◽  
pp. 1048-1062 ◽  
Author(s):  
Justin N. Murdock ◽  
Keith B. Gido ◽  
Walter K. Dodds ◽  
Katie N. Bertrand ◽  
Matt R. Whiles
Keyword(s):  
Structure And Function ◽  
Ecosystem Structure ◽  
Stream Ecosystem ◽  
Recovery Trajectory ◽  
And Function ◽  
Ecosystem Structure And Function

Deammonification in biofilm systems: population structure and function

2002 ◽  
Vol 46 (1-2) ◽  
pp. 223-231 ◽  
Author(s):  
C. Helmer-Madhok ◽  
M. Schmid ◽  
E. Filipov ◽  
T. Gaul ◽  
A. Hippen ◽  
...  
Keyword(s):  
Population Structure ◽  
Stable Process ◽  
Cost Effective ◽  
Structure And Function ◽  
Combined Application ◽  
Cost Effective Treatment ◽  
And Function ◽  
The Cost ◽  
Micro Organisms ◽  
Nitrogen Elimination

For the development of alternative concepts for the cost effective treatment of wastewaters with high ammonium content and low C/N-ratio, autotrophic consortia of micro-organisms with the ability to convert ammonium directly into N2 are of particular interest. Several full-scale industrial biofilm plants eliminating nitrogen without carbon source for years in a stable process, are suspected for some time to harbor active anaerobic ammonium oxidizers in deeper, oxygen-limited biofilm layers. In order to identify the processes of the single-stage nitrogen elimination (deammonification) in biofilm systems and to allocate them to the responsible micro-organisms, a deammonifying moving-bed pilot plant was investigated in detail. 15N-labelled tracer compounds were used as well as 16S rDNA libraries and in situ identification of dominant organisms. The usage of rRNA-targeted oligonucleotide probes (FISH) was particularly emphasized on the ammonium oxidizers of the β-subclass of Proteobacteria and on the members of the order Planctomycetales. The combined application of these methods led to a deeper insight into the population structure and function of a deammonifying biofilm.

Abandoned coal mine drainage and its remediation: impacts on stream ecosystem structure and function

2012 ◽  
Vol 22 (8) ◽  
pp. 2144-2163 ◽  
Author(s):  
Thomas L. Bott ◽  
John K. Jackson ◽  
Matthew E. McTammany ◽  
J. Denis Newbold ◽  
Steven T. Rier ◽  
...  
Keyword(s):  
Coal Mine ◽  
Mine Drainage ◽  
Structure And Function ◽  
Ecosystem Structure ◽  
Stream Ecosystem ◽  
Coal Mine Drainage ◽  
And Function ◽  
Ecosystem Structure And Function ◽  
Abandoned Coal Mine

Conservation and Management of Salmon in the Age of Genomics

2020 ◽  
Vol 8 (1) ◽  
pp. 117-143 ◽  
Author(s):  
Robin S. Waples ◽  
Kerry A. Naish ◽  
Craig R. Primmer
Keyword(s):  
Population Structure ◽  
Population Genetic ◽  
Evolutionary Ecology ◽  
Natural Populations ◽  
Structure And Function ◽  
Population Assignment ◽  
Genetic Studies ◽  
And Function ◽  
Management And Conservation ◽  
Conservation And Management

Salmon were among the first nonmodel species for which systematic population genetic studies of natural populations were conducted, often to support management and conservation. The genomics revolution has improved our understanding of the evolutionary ecology of salmon in two major ways: ( a) Large increases in the numbers of genetic markers (from dozens to 104–106) provide greater power for traditional analyses, such as the delineation of population structure, hybridization, and population assignment, and ( b) qualitatively new insights that were not possible with traditional genetic methods can be achieved by leveraging detailed information about the structure and function of the genome. Studies of the first type have been more common to date, largely because it has taken time for the necessary tools to be developed to fully understand the complex salmon genome. We expect that the next decade will witness many new studies that take full advantage of salmonid genomic resources.

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