scholarly journals Rearing water microbiomes in white leg shrimp (Litopenaeus vannamei) larviculture assemble stochastically and are influenced by the microbiomes of live feed products

2020 ◽  
Author(s):  
Jasmine Heyse ◽  
Ruben Props ◽  
Pantipa Kongnuan ◽  
Peter De Schryver ◽  
Geert Rombaut ◽  
...  
Keyword(s):  
Community Assembly ◽  
Litopenaeus Vannamei ◽  
Bacterial Load ◽  
Management Strategies ◽  
Water Source ◽  
Taxonomic Composition ◽  
Algal Community ◽  
Source Tracking ◽  
Live Feed ◽  
Sampling Campaign

SummaryThe development of effective management strategies to reduce the occurrence of diseases in aquaculture is hampered by the limited knowledge on the microbial ecology of these systems. In this study, the dynamics and dominant community assembly processes in the rearing water of Litopenaeus vannamei larviculture tanks were determined. Additionally, the contribution of peripheral microbiomes, such as those of live and dry feeds, to the rearing water microbiome were quantified. The community assembly in the hatchery rearing water over time was dominated by stochasticity, which explains the observed heterogeneity between replicate cultivations. The community undergoes two shifts that match with the dynamics of the algal abundances in the rearing water. Source tracking analysis revealed that 37% of all bacteria in the hatchery rearing water were either introduced by the live or dry feeds, or during water exchanges. The contribution of the microbiome from the algae was the largest, followed by that of the Artemia, the exchange water and the dry feeds. Our findings provide fundamental knowledge on the assembly processes and dynamics of rearing water microbiomes and illustrate the crucial role of these peripheral microbiomes in maintaining health-promoting rearing water microbiomes.Originality-Significance StatementMost studies on rearing water microbiomes are characterized by sampling resolutions of multiple days and by few replicate cultivations. Through an 18-day sampling campaign in a Litopenaeus vannamei hatchery where five replicate cultivations were studied at a sampling resolution of one day, we studied the microbiome dynamics in this system. We show that the community assembly is dominated by stochasticity, which explains the heterogeneity between replicate cultivations. The dynamics of the algal community in the rearing water induced shifts in community composition at two differerent timepoints. Finally, we quantified the contribution of live and dry feed microbiomes to the rearing water community for the first time. We found that the contribution of each source was dependent on its taxonomic composition, the bacterial load caused by the addition of this source and the timing of the introduction. These new insights will aid in the further development of effective microbiome management to reduce the frequency and magnitude of bacterial diseases.

scholarly journals Water quality drives the regional patterns of an algal metacommunity in interconnected lakes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Min Sung Kim ◽  
Seok Hyun Ahn ◽  
In Jae Jeong ◽  
Tae Kwon Lee
Keyword(s):  
Water Quality ◽  
Community Assembly ◽  
River Flow ◽  
Geographical Area ◽  
Oxygen Demand ◽  
Algal Community ◽  
Regional Patterns ◽  
Algal Communities ◽  
Species Sorting ◽  
Metacommunity Structure

AbstractThe metacommunity approach provides insights into how the biological communities are assembled along the environmental variations. The current study presents the importance of water quality on the metacommunity structure of algal communities in six river-connected lakes using long-term (8 years) monitoring datasets. Elements of metacommunity structure were analyzed to evaluate whether water quality structured the metacommunity across biogeographic regions in the riverine ecosystem. The algal community in all lakes was found to exhibit Clementsian or quasi-Clementsian structure properties such as significant turnover, grouped and species sorting indicating that the communities responded to the environmental gradient. Reciprocal averaging clearly classified the lakes into three clusters according to the geographical region in river flow (upstream, midstream, and downstream). The dispersal patterns of algal genera, including Aulacoseira, Cyclotella, Stephanodiscus, and Chlamydomonas across the regions also supported the spatial-based classification results. Although conductivity, chemical oxygen demand, and biological oxygen demand were found to be important variables (loading > |0.5|) of the entire algal community assembly, water temperature was a critical factor in water quality associated with community assembly in each geographical area. These results support the notion that the structure of algal communities is strongly associated with water quality, but the relative importance of variables in structuring algal communities differed by geological regions.

scholarly journals Melanosis and quality attributes of chill stored farm raised whiteleg shrimp (Litopenaeus vannamei)

2017 ◽  
Vol 9 (1) ◽  
pp. 626-631 ◽  
Author(s):  
S. R. Senapati ◽  
G. Praveen Kumar ◽  
Chongtham Baru Singh ◽  
K. A. Martin Xavier ◽  
M. K. Chouksey ◽  
...  
Keyword(s):  
Litopenaeus Vannamei ◽  
Bacterial Load ◽  
Black Spot ◽  
Thiobarbituric Acid ◽  
Quality Parameters ◽  
Plate Count ◽  
Thiobarbituric Acid Reactive Substances ◽  
Chilled Storage ◽  
Total Plate Count ◽  
Whiteleg Shrimp

Loss of market value of shrimp is mainly due to the formation of black spot called melanosis. A study was conducted for 14 days to determine the extent of melanosis and quality changes during that period of freshly har-vested whiteleg shrimp (Litopenaeus vannamei) under chilled storage (2℃). Among quality parameters, total volatile basic nitrogen (TVB-N), thiobarbituric acid reactive substances (TBAR-S), were varied from 13.17 mg % to 44.50 mg % and 0.04to 2.57 mg malondehaldehyde/kg of fat respectively whereas melanosis score and metric chroma (C) exhibited significant increases during chilled storage (P<0.05). There was a slight increase in moisture, crude fat and pH from 73.96 % to 74.57 %, 1.05 % to 1.14 % and 6.52 to 7.60 respectively at 14th day of storage. Loss of protein from 22.51 % to 21.28 % may be due to decrease in available amino acids during chilled storage and total plate count (TPC) showed gradual increase of bacterial load up to 1.73*107 log CFU/g at the end of chilled storage. The sensory analysis by panellists indicated, the acceptability of white leg shrimp was up to 6 days in chilled condition and formation of black spot is one of the major parameter for rejection by the panellists.

scholarly journals Coping with poor water supply in peri-urban Bandung, Indonesia: towards a framework for understanding risks and aversion behaviours

2017 ◽  
Vol 29 (1) ◽  
pp. 69-88 ◽  
Author(s):  
Anindrya Nastiti ◽  
Barti Setiani Muntalif ◽  
Dwina Roosmini ◽  
Arief Sudradjat ◽  
S V Meijerink ◽  
...  
Keyword(s):  
Water Supply ◽  
Risk Perceptions ◽  
Management Strategies ◽  
Water Source ◽  
Economic Losses ◽  
Socioeconomic Characteristics ◽  
Perceptions Of Risk ◽  
Shared Experiences ◽  
Actual Risk ◽  
Risk Management Strategies

This paper explores the daily risks of households with respect to dimensions of inadequate water access and supply (quality, quantity, continuity and affordability). We describe how perceptions of risk are shaped and how households seek to reduce possible health impacts and potential economic losses through aversion behaviours. To this end, households’ activities relating to water storage, treatment and usage, together with water source preference, were analysed using a qualitative approach. We developed a framework that describes actual risk, risk perceptions and aversion behaviours. Risk perceptions and the adoption of aversion behaviours of varying frequency and intensity are based on a complex interaction between personal and shared experiences that relate to water supply dimensions, socioeconomic characteristics, and social networking. Moreover, we discuss household risk management strategies and provide some recommendations aimed at improving future approaches to the study of aversion behaviours.

Seasonal variations of metal concentrations in periphyton and taxonomic composition of the algal community at a Yenisei River littoral site

2010 ◽  
Vol 5 (1) ◽  
pp. 125-134 ◽  
Author(s):  
Olesya Anishchenko ◽  
Michail Gladyshev ◽  
Elena Kravchuk ◽  
Elena Ivanova ◽  
Iliada Gribovskaya ◽  
...  
Keyword(s):  
Seasonal Variations ◽  
Early Spring ◽  
Taxonomic Composition ◽  
Early Summer ◽  
Algal Community ◽  
Yenisei River ◽  
Algal Communities ◽  
Metal Contents ◽  
Middle Stream ◽  
A Site

AbstractThe concentrations of metals K, Na, Ca, Mg, Fe, Mn, Zn, Cu, Ni, Pb, Co and Cr, in the water and periphyton (epilithic algal communities) were studied at a site in the middle stream of the Yenisei River (Siberia, Russia) during three years using monthly sampling frequencies. Despite considerable seasonal variations in aquatic concentrations of some metals, there was no correlation between metal contents in the water and in periphyton. Seasonal concentration variations of some metals in periphyton were related to the species (taxonomic) composition of periphytic microalgae and cyanobacteria. Enhanced levels of Ni and Co in periphyton in late autumn, winter, and early spring were likely caused by the predominance of cyanobacteria in the periphytic community, and annual maximum levels of K in periphyton in late spring and early summer were attributed to the domination of Chlorophyta, primarily Ulothrix zonata.

Algal composition and biomass in the tropical soda lake Chitu with focus on seasonal variability of Arthrospira fusiformis (Cyanophyta)

2016 ◽  
Vol 67 (4) ◽  
pp. 483 ◽  
Author(s):  
Tadesse Ogato ◽  
Demeke Kifle ◽  
Brook Lemma
Keyword(s):  
Seasonal Variability ◽  
Soda Lakes ◽  
Soda Lake ◽  
Dry Weight ◽  
Taxonomic Composition ◽  
Algal Community ◽  
Environmental Drivers ◽  
East African ◽  
Chl A ◽  
Algal Abundance

The vital ecological functions of the East African soda lakes are much dependent on Arthrospira, which forms a natural nearly monoalgal populations and serves as the main diet for the huge flocks of flamingos in the present study lake Chitu (Ethiopia). This study investigated algal taxonomic composition and biomass, and the seasonal variability in the abundance of Arthrospira fusiformis in response to some environmental drivers (e.g. rainfall, salinity and nutrients) using samples collected over an annual cycle. The algal community was composed of a few taxa (15 species), with exclusive dominance of A. fusiformis. Chlorophyll-a (Chl-a) and dry weight, and abundance of A. fusiformis were notably high and exhibited seasonal variations, with significantly (P<0.05) higher levels of Chl-a and dry weight during the rainy season. The observed strong correlations of algal abundance and biomass with rainfall (positively) and alkalinity-salinity (negatively), probably suggest that hydrological control of the salinity is the major driving force for the seasonal variability of A. fusiformis in the lake. Further hydrological modifications that enhance salinisation may greatly affect A. fusiformis thereby causing instability of the flamingos with eventual impairment of the ecosystem values of the lake.

Decentralized System of Greywater Recycling for Sustainable Urban Water Source (Case Study: Surakarta City-Indonesia)

2016 ◽  
Vol 845 ◽  
pp. 18-23
Author(s):  
Siti Qomariyah
Keyword(s):  
Management Strategies ◽  
Water Source ◽  
Developed Countries ◽  
Decentralized System ◽  
Central Java ◽  
Drainage Channels ◽  
Source Case ◽  
Alternative Water ◽  
The City

Fresh water resources have been depleted and polluted globally. Many developed countries have encouraged in using grey water recycling as an alternative water resource. Many developing countries are however very slow to adopt the need for the alternative. Surakarta City is the second largest city in Central Java Province, Indonesia. The city is experiencing in drought and flooding. Rivers and groundwater have been polluted as well. This paper recommended decentralized urban greywater management strategies with two greywater treatment systems i.e. Two-stage and Subsurface constructed wetland systems. The application of the systems could provide householders getting significant water saving, reducing the amount of wastewater entering the existing drainage channels, and improving surface and groundwater quality.

scholarly journals A PLSR model to predict soil salinity using Sentinel-2 MSI data

2021 ◽  
Vol 13 (1) ◽  
pp. 977-987
Author(s):  
Ghada Sahbeni
Keyword(s):  
Soil Salinity ◽  
Spectral Characteristics ◽  
Management Strategies ◽  
Salt Content ◽  
Soil Surface ◽  
Coefficient Of Determination ◽  
Least Squares Regression ◽  
Remotely Sensed Data ◽  
Sampling Campaign ◽  
Sentinel 2

Abstract Salinization is one of the most widespread environmental threats in arid and semi-arid regions that occur either naturally or artificially within the soil. When exceeding the thresholds, salinity becomes a severe danger, damaging agricultural production, water and soil quality, biodiversity, and infrastructures. This study used spectral indices, including salinity and vegetation indices, Sentinel-2 MSI original bands, and DEM, to model soil salinity in the Great Hungarian Plain. Eighty-one soil samples in the upper 30 cm of the soil surface were collected from vegetated and nonvegetated areas by the Research Institute for Soil Sciences and Agricultural Chemistry (RISSAC). The sampling campaign of salinity monitoring was performed in the dry season to enhance salt spectral characteristics during its accumulation in the subsoil. Hence, applying a partial least squares regression (PLSR) between salt content (g/kg) and remotely sensed data manifested a highly moderate correlation with a coefficient of determination R 2 of 0.68, a p-value of 0.000017, and a root mean square error of 0.22. The final model can be deployed to highlight soil salinity levels in the study area and assist in understanding the efficacy of land management strategies.

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