Vertical distribution of particle-associated and free-living ammonia-oxidizing archaea in Suruga Bay, a deep coastal embayment of Japan

2019 ◽  
Vol 201 (8) ◽  
pp. 1141-1146
Author(s):  
Minoru Ijichi ◽  
Hajime Itoh ◽  
Koji Hamasaki
Keyword(s):  
Vertical Distribution ◽  
Suruga Bay ◽  
Free Living ◽  
Ammonia Oxidizing Archaea ◽  
Coastal Embayment

scholarly journals Composition and vertical distribution of free living and plant parasitic nematodes in hop gardens in the Czech Republic

2011 ◽  
Vol 48 (2) ◽  
pp. 124-136 ◽  
Author(s):  
V. Čermák ◽  
V. Gaar ◽  
L. Háněl ◽  
K. Široká
Keyword(s):  
Czech Republic ◽  
Vertical Distribution ◽  
Soil Profile ◽  
Parasitic Nematodes ◽  
Soil Nematode ◽  
Plant Parasitic Nematodes ◽  
Free Living ◽  
The Czech Republic ◽  
Nematode Communities ◽  
Plant Parasitic

AbstractComposition and vertical distribution of soil nematode communities within soil profile were investigated in eight hop gardens in Czech Republic. In total, the presence of 78 nematode genera was confirmed. Genus Drilocephalobus (Coomans & Coomans, 1990) is new for fauna of the Czech Republic. The highest abundance of soil nematodes was found at a depth of 0–10 cm and declined with increasing depth of soil profile. The most dominant genus was Bitylenchus, followed by genera Acrobeloides, Ditylenchus, Chiloplacus and Cervidelus. Ten genera of plant parasitic nematodes were recorded: Bitylenchus (with prevalence of B. dubius), Helicotylenchus, Heterodera (with absolute prevalence of H. humuli), Geocenamus, Longidorella, Longidorus (only L. elongatus), Merlinius (with prevalence of M. brevidens), Paratylenchus and Pratylenchus. Low population densities of predators and omnivores, low values of the community indices (MI, ΣMI, SI, and CI), and high values of NCR, EI, and PPI/MI ratio indicated disturbed nematode communities in hop gardens and bacteria-dominated decomposition pathways in the soil food web.

scholarly journals VERTICAL DISTRIBUTION AND DENSITY OF CORAL FUNGIIDAE ON MALALAYANG WATERS

2013 ◽  
Vol 1 (1) ◽  
pp. 42
Author(s):  
Friska Mampuk ◽  
Hanny Tioho ◽  
Janny D. Kusen
Keyword(s):  
Vertical Distribution ◽  
Reef Flat ◽  
Reef Slope ◽  
Hard Substrate ◽  
Coral Recruitment ◽  
Free Living

Fungiidae known as a solitaire coral, attachment and also free living and has capability of individual move for migrate.  Their mobility allows them to expand the area, providing a hard substrate for coral recruitment and shelter for other invertebrates.  The objective of this study was to examine the density and distribution of fungiid corals in Malalayang waters. The data were collected from September to December 2012 at four different areas.  The results of this study showed that the highest density of fungiid corals were occurred on the front reef study site and mostly by Fungia danai (0,62 ind/m2), compared with other species such as Herpolitha limax (0,25 ind/m2), F. paumotensis (0,19 ind/m2), F. fungites (0,18 ind/m2), F. granulosa (0,18 ind/m2) and with an aggregated pattern of distribution.   Fungiid corals found in this study were mostly relatively more on the reef flat compared to the reef slope.

Vertical and temporal distribution of free-living nematodes dwelling in two sandy-bed streams fed by helocrene springs

Nematology ◽  
2015 ◽  
Vol 17 (8) ◽  
pp. 923-940 ◽  
Author(s):  
Walter Traunspurger ◽  
Ilka Threis ◽  
Nabil Majdi
Keyword(s):  
Organic Matter ◽  
Vertical Distribution ◽  
Temporal Distribution ◽  
Horizontal Distribution ◽  
Free Living ◽  
Plant Feeding ◽  
Functional Richness ◽  
Benthic Organic Matter ◽  
Parthenogenetic Reproduction ◽  
Sediment Layers

We monitored for 1 year the sediment nematofauna of two headwater streams located near water resurgence from typical helocrene springs. Nematode community composition, benthic organic matter (BOM) and chlorophylla(BChl a) were assessed in two sediment layers (0-5 and 5-10 cm depth), providing insights into nematode vertical distribution. Globally, the density, diversity and functional richness of nematodes were lower in the upper sediments, although important amounts of BChl awere available there. The assemblages differed markedly between springs, with only 41 shared species from a total of 120 species, suggesting stochastic horizontal distribution even at small geographical scales (<5 km). Bacterial-feeding nematodes dominated in the upper sediments, whereas omnivorous, fungal- and plant-feeding nematodes thrived in the deeper sediments. Reproduction by the dominant algal-feeding species,Prodesmodora arctica, was detected in August. The substantial presence of juveniles throughout the year highlighted the importance of parthenogenetic reproduction.

scholarly journals Spatiotemporal distribution of planktonic ciliates in the Kuybyshev water reservoir in the area of Klimovskaya narrowing

2021 ◽  
pp. 146-162
Author(s):  
S. V. Bykova ◽  
V. A. Andreeva
Keyword(s):  
Vertical Distribution ◽  
Water Column ◽  
Water Reservoir ◽  
Regulated River ◽  
Individual Species ◽  
Hydroelectric Power Station ◽  
Kuibyshev Reservoir ◽  
Free Living ◽  
Planktonic Ciliates ◽  
Wide Range

The paper attempts to link changes in quantitative characteristics of the community of free-living planktonic ciliates and the nature of their vertical distribution with the operation mode of the hydroelectric power station in the reservoir. Low values of the abundance (8–1,560 thousand cells / m3) and biomass (0.1–66.9 mg / m3) of ciliates in the water column, and a fairly wide range of their variation in the reservoir are probably due to the oscillatory nature of the hydrological regime in the regulated river conditions. The vertical distribution of free-living planktonic ciliates of the near-dam section of the Kuibyshev reservoir was studied at all times of the day on all days of the week. The species were distributed throughout the water column to the bottom with some preference for the surface (0–2 m) and medium (4–10 m) layers. There was no clear attachment of individual species to certain layers in the conditions of homothermy. The preference for certain horizons is due to some biological characteristics of the species (for example, peritriches on the coenobia of algae in the surface layers), departure from “blooming spots”, etc. No data in favor of vertical migrations or “turbulent transport” has yet been revealed. The influence of the weekly regime of regulation of the Zhigulevskaya HPS, in which at the end of the working week, the fluctuation amplitude of many hydrological parameters probably decreases, is manifested in an increase in the abundance and biomass of planktonic ciliates at this time.The nature of the daily change in the average ciliates abundance in the water column was the same for a variant of the community in working days and was in antiphase with the change in the community abundance on weekends, namely: the maximum number on working days and on weekends was recorded in the evening (20.00) and in the daytime (14.00), respectively.

scholarly journals Microbial Community Diversity and Vertical Distribution in a Columnar Sediment of Maluku Strait

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Yan Wang ◽  
Fuchao Li ◽  
Jin Zhao ◽  
Huaxin Chen ◽  
Peng Jiang ◽  
...  
Keyword(s):  
16S Rrna ◽  
Vertical Distribution ◽  
Surface Sediment ◽  
Ammonia Oxidation ◽  
Community Diversity ◽  
Ocean Current ◽  
Phylogenetic Groups ◽  
Sediment Samples ◽  
Bacterial Phyla ◽  
Ammonia Oxidizing Archaea

The sediment samples were collected from Maluku Strait at a depth of 1250 m, which is influenced by Mindanao Current and Indonesian Throughflow. Based on 16S rRNA clone libraries, the community structure and vertical distribution of archaea and bacteria were studied in a columnar sediment of 2m in length. From the surface sediment, 16S sequences were derived from fourteen bacterial phyla (Gammaproteobacteria, Planctomycetes, Alphaproteobacteria, Deltproteobacteria were dominant), but were limited to two groups of archaea: Crenarchaeota (99%) and Euryarchaeota (1%). Besides, 90% of the archaea clones were ammonia oxidation-related which indicated that the ammonia-oxidizing archaea might make a significant contribution to the chemosynthesis in the surface sediment. Contrastively in the bottom sediment, six bacterial phylogenetic groups were obtained (Gammaproteobacteria and Firmicutes were absolutely dominant), however no archaea 16S rRNA was detected. The microbial diversity of surface sediment was much higher than the bottom and seven unique bacterial phyla were obtained from two sediment respectively. The geochemical elements analysis revealed that the content of C, TOC and S in the surface sediment was much higher than the bottom, but the content of P is contrary. The microbial communities might be in response to the geochemical substance transfer and deposit influenced by the ocean current and it deserves further study compared with the other sediment samples in this area.

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