scholarly journals Community structure, abundance and distribution of phytoplankton in Sungi river, Bali Province

2021 ◽  
Vol 1098 (5) ◽  
pp. 052044
Author(s):  
S A M P Suryani ◽  
I W Arya ◽  
N M Darmadi ◽  
I M Kawan
Keyword(s):  
Community Structure ◽  
Abundance And Distribution

scholarly journals Hydrozoan diversity on hard bottom in Kongsfjorden, Svalbard

2010 ◽  
Vol 90 (7) ◽  
pp. 1337-1352 ◽  
Author(s):  
Andrey Voronkov ◽  
Sofia D. Stepanjants ◽  
Haakon Hop
Keyword(s):  
Species Richness ◽  
Community Structure ◽  
Environmental Conditions ◽  
Depth Range ◽  
Factors Influencing ◽  
Main Factors ◽  
Abundance And Distribution ◽  
First Time

Hydroids in Kongsfjorden, Svalbard, were studied on five hard-bottom transects along gradients of environmental conditions from the glacier at the fjord's head to the fjord's mouth at depth-range 0–30 m. Hydrozoa colonies are widely distributed on rock and gravel substrata in Kongsfjorden. In general, however, hydroids are not dominant or subdominant in zoobenthic communities. The exception isSymplectoscyphus tricuspidatusvar.acuminatus, colonies of which were sometimes abundant enough to determine the community structure and characteristics of benthic diversity. Of the 23 species recorded in this study,Laomedea flexuosa,Phialella quadrataandHalecium tenellumas well as representatives of family Stylasteridae were recorded from Svalbard waters for the first time. Hydroid diversity was highest in the zoobenthic community structured by branched bryozoans. The abundance and distribution of hydroids were reduced, to some extent, in the inner part of the fjord compared to the outer fjord. Species richness of hydroids was high at shallow depths, decreased at around 15 m and then increased again to 30 m depth. Species with Low-boreal–Arctic and Panoceanic distributional ranges were the most frequently occurring species. Depth, type of background substratum and amount of silt on its surface were the main factors influencing hydroid distribution. Description of all recorded taxa distributions together with data on their habitat and associations in zoobenthic communities are presented in an Appendix.

The relation between sediment nutrient content and macrophyte biomass and community structure along a water transparency gradient among lakes of the Mackenzie Delta

2003 ◽  
Vol 60 (3) ◽  
pp. 333-343 ◽  
Author(s):  
Margaret M Squires ◽  
Lance FW Lesack
Keyword(s):  
Community Structure ◽  
Plant Biomass ◽  
Nutrient Content ◽  
Water Clarity ◽  
Water Transparency ◽  
High Rate ◽  
Mackenzie Delta ◽  
High Transparency ◽  
Abundance And Distribution ◽  
High Sediment

Macrophyte abundance and distribution among lakes of the Mackenzie Delta were assessed where increasing distance from the river (chain set) and increasing frequency of flooding (sill set) corresponded with increasing water transparency. Overall, sediment organic matter (OM) and total nitrogen (TN) content increased with increasing biomass of macrophytes but was higher in the sill set than in the chain set. The amount of phosphorus (P) in sediments was similar among lakes, but pore-water P was appreciably higher in the chain set. Increasing sediment OM and water clarity corresponded with increasing biomass of macrophytes in the lakes. Community structure shifted from dominance by erect Potamogeton at low and intermediate transparency and moderate sediment OM content to low-growing Chara and Ceratophyllum at high transparency and high sediment OM. Similar transparency in the chain set supported greater biomass of macrophytes than in the sill set. A high rate of inorganic sedimentation (linked with frequent flooding) and organic sedimentation (linked with high transparency and plant biomass) may result in the most suitable substrate for the growth of macrophytes among lakes of the Mackenzie Delta. Submersed plant biomass was higher in the Mackenzie Delta lakes than in temperate lakes and comparable to that in the temperate and tropical floodplains, despite the high-latitude location.

scholarly journals Active or not? What microbial assemblages say about pockmarks located at Estremadura Spur (NE Atlantic)

2018 ◽  
Author(s):  
Clara F Rodrigues ◽  
Vitor Magalhães ◽  
Marina Cunha
Keyword(s):  
Community Structure ◽  
Ecosystem Functioning ◽  
Critical Role ◽  
Environmental Parameters ◽  
Marine Ecosystems ◽  
Biogeochemical Cycles ◽  
Ne Atlantic ◽  
Abundance And Distribution ◽  
Generation Sequencing ◽  
Hydrocarbon Degraders

Bacteria are important components of marine ecosystems and play a critical role in the biogeochemical cycles. Although ubiquitous and abundant in marine ecosystems, little is known about their diversity and composition, which is usually affected by several environmental parameters. Due to their abundance and distribution, which includes shallow-water locations, the contribution of pockmarks to global methane and hydrocarbon release could be massive. Microbial assemblages associated with pockmarks are known to be different between active and inactive sites. In this study, the microbial assemblages associated with several pockmarks located at the outer shelf of the Estremadura Spur were revealed using a next-generation sequencing of the bacterial/archaeal 16S RRNA. The sampled stations show a similar community structure for the most abundant phyla. OTUs encompass 59 bacterial and three archaeal phyla. Within Bacteria, Proteobacteria with 62.6% was the dominant phylum followed by Actinobacteria (7.8%), Acidobacteria (7.7%), Bacteroidetes (4.5%) and Gemmatimonadetes (2.8%). These groups are known to dominate marine sediments and their diversity was comparable to other studies. The studied microbial assemblages also comprised several phylotypes associated with the cycling of sulfur and nitrate compounds, as well as numerous know hydrocarbon degraders emphasizing its importance for the ecosystem functioning.

The zooplankton of the Forth, Scotland

1987 ◽  
Vol 93 (3-4) ◽  
pp. 377-388 ◽  
Author(s):  
C. J. L. Taylor
Keyword(s):  
Community Structure ◽  
Fresh Water ◽  
Environmental Variables ◽  
Species Complex ◽  
Species Abundance ◽  
Abundance And Distribution

SynopsisA description of the community structure of the Forth estuary's zooplankton was obtained by sampling monthly at nine stations ranging from fresh water to fully marine conditions for an eighteen-month period. The variation in species abundance and distribution is related to environmental variables. The apparent spatial and temporal successions of members of the Acartia species complex are described, as are the episodes of predation spreading from the firth and the domination of the upper estuary by Eurytemora. It is observed that the estuary of the Forth is rare among British estuaries in its ability to support a truly pelagic self-maintaining assemblage of species.

scholarly journals Active or not? What microbial assemblages say about pockmarks located at Estremadura Spur (NE Atlantic)

2018 ◽  
Author(s):  
Clara F Rodrigues ◽  
Vitor Magalhães ◽  
Marina Cunha
Keyword(s):  
Community Structure ◽  
Ecosystem Functioning ◽  
Critical Role ◽  
Environmental Parameters ◽  
Marine Ecosystems ◽  
Biogeochemical Cycles ◽  
Ne Atlantic ◽  
Abundance And Distribution ◽  
Generation Sequencing ◽  
Hydrocarbon Degraders

Bacteria are important components of marine ecosystems and play a critical role in the biogeochemical cycles. Although ubiquitous and abundant in marine ecosystems, little is known about their diversity and composition, which is usually affected by several environmental parameters. Due to their abundance and distribution, which includes shallow-water locations, the contribution of pockmarks to global methane and hydrocarbon release could be massive. Microbial assemblages associated with pockmarks are known to be different between active and inactive sites. In this study, the microbial assemblages associated with several pockmarks located at the outer shelf of the Estremadura Spur were revealed using a next-generation sequencing of the bacterial/archaeal 16S RRNA. The sampled stations show a similar community structure for the most abundant phyla. OTUs encompass 59 bacterial and three archaeal phyla. Within Bacteria, Proteobacteria with 62.6% was the dominant phylum followed by Actinobacteria (7.8%), Acidobacteria (7.7%), Bacteroidetes (4.5%) and Gemmatimonadetes (2.8%). These groups are known to dominate marine sediments and their diversity was comparable to other studies. The studied microbial assemblages also comprised several phylotypes associated with the cycling of sulfur and nitrate compounds, as well as numerous know hydrocarbon degraders emphasizing its importance for the ecosystem functioning.

Polychaete community structure of the northwestern coast of Mexico: patterns of abundance and distribution

Hydrobiologia ◽  
2003 ◽  
Vol 496 (1-3) ◽  
pp. 385-399 ◽  
Author(s):  
Verónica Rodríguez-Villanueva ◽  
Ricardo Martínez-Lara ◽  
Vinicio Macías Zamora
Keyword(s):  
Community Structure ◽  
Northwestern Coast ◽  
Abundance And Distribution

Summer bird abundance and distribution on set-aside fields on intensive arable farms in England

Ecography ◽  
2000 ◽  
Vol 23 (1) ◽  
pp. 50-59 ◽  
Author(s):  
Ian G. Henderson ◽  
Juliet A. Vickery ◽  
Robert J. Fuller
Keyword(s):  
Bird Abundance ◽  
Abundance And Distribution

ESTIMATION OF THE ABUNDANCE AND DISTRIBUTION OF RARE EARTH ELEMENTS IN SOIL AROUND KADUNA REFINING AND PETROCHEMICAL COMPANY USING NUCLEAR TECHNIQUE

2020 ◽  
Vol 4 (2) ◽  
pp. 599-604
Author(s):  
Michael A. Onoja ◽  
P. H. Bukar ◽  
C. U. Omeje ◽  
A. M. Adamu
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Nuclear Technique ◽  
Flood Plains ◽  
Economic Exploitation ◽  
Rare Elements ◽  
Petrochemical Company ◽  
The Moment ◽  
Abundance And Distribution ◽  
Natural Pattern

Instrumental neutron activation analysis (INAA) technique was used to investigate the abundance and distribution of rare earth elements (REE) in soil around Kaduna Refinery. The aim of the study is to assess the rare elements potential of Nigeria for economic exploitation. Five REEs (La, Dy, Eu, Yb, and Lu) were detected in varying concentrations ranging from a minimum of 0.6 µg/g (Lu) to a maximum of 249.0 µg/g (La). The elements existed with trends consistent with the natural pattern of REEs in soil, showing significant Eu and Dy anomalies which characterize upper plains and flood plains. The levels of REEs in soil in the study area were generally slightly above background levels, with minimal (La, Dy, and Eu), moderate (Yb), and significant (Lu) enrichments and trending: Lu ˃Yb ˃ Eu ˃ Dy ˃ La. The abundance of the REEs investigated cannot establish a potential of Nigeria for economic exploitation of the mineral, hence, rare earth project in the study area is not viable at the moment.

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