0849 - Coral hosts in deep water enrich for different bacterial communities

Effect of Bacillus spp. on Lettuce Growth and Root Associated Bacterial Community in a Small-Scale Aquaponics System

Agronomy ◽

10.3390/agronomy11050947 ◽

2021 ◽

Vol 11 (5) ◽

pp. 947

Author(s):

Nasser Kasozi ◽

Horst Kaiser ◽

Brendan Wilhelmi

Keyword(s):

Water Quality ◽

Control Systems ◽

Deep Water ◽

Bacterial Communities ◽

Small Scale ◽

Rrna Gene ◽

Culture Solution ◽

Water Culture ◽

Lettuce Growth ◽

The Mean

The integration of probiotics in aquaponics systems is a strategy for mitigating environmental impacts and for promoting sustainable agriculture. In order to understand the role of probiotics, we investigated the effect of a commercial probiotic mixture of Bacillus subtilis and B. licheniformis on the growth of lettuce (Lactuca sativa L.) under deep-water culture integrated with Mozambique tilapia (Oreochromis mossambicus). We determined plant growth, water quality parameters, and leaf mineral analysis, and assessed the influence of a probiotic mixture on the microbiota. Bacterial communities were analyzed by high-throughput 16S rRNA gene sequencing. Compared to the control systems, the addition of the probiotic Bacillus significantly increased the concentration of nitrate and phosphate in deep water culture solution, which contributed to improved lettuce growth. In both the growth trials, the Fv/Fm, the mean shoot dry weight, and the mean fresh weight of the harvested shoots from the Bacillus treatment were significantly higher than those observed for the control plants. Higher concentrations of phosphorus, potassium, and zinc in the lettuce leaves were found in systems that received the Bacillus. Although differences were observed at the phylum level, Proteobacteria and Bacteroidetes were predominant in both the Bacillus-treatment and the control systems. At the genus level, however, the communities present in the two types of systems were heterogeneous with Bacillus-treated systems, containing significantly higher numbers of Chryseobacterium, Bacillus, Nitrospira, Polynucleobacter, and Thermomonas. The results indicate that Bacillus supplementation can effectively alleviate nutrient deficiencies, improve water quality, and modify the composition of bacterial communities in aquaponics systems.

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Diversity of the Bacterial Communities Associated with the Azooxanthellate Deep Water Octocorals Leptogorgia minimata, Iciligorgia schrammi, and Swiftia exertia

Marine Biotechnology ◽

10.1007/s10126-007-9009-1 ◽

2007 ◽

Vol 9 (5) ◽

pp. 561-576 ◽

Cited By ~ 38

Author(s):

Thomas B. Brück ◽

Wolfram M. Brück ◽

Lory Z. Santiago-Vázquez ◽

Peter J. McCarthy ◽

Russell G. Kerr

Keyword(s):

Deep Water ◽

Bacterial Communities

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Associated bacterial communities of two deep-water sponges

Aquatic Microbial Ecology ◽

10.3354/ame039047 ◽

2005 ◽

Vol 39 ◽

pp. 47-55 ◽

Cited By ~ 41

Author(s):

JB Olson ◽

PJ McCarthy

Keyword(s):

Deep Water ◽

Bacterial Communities

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Benthic foraminiferal zonation in deep-water carbonate platform margin environments, northern Little Bahama Bank

Journal of Paleontology ◽

10.1017/s0022336000058819 ◽

1988 ◽

Vol 62 (01) ◽

pp. 1-8 ◽

Cited By ~ 1

Author(s):

Ronald E. Martin

Keyword(s):

Deep Water ◽

Benthic Foraminifera ◽

Carbonate Platform ◽

Sedimentary Facies ◽

Depositional Environments ◽

Near Surface ◽

Sediment Gravity Flows ◽

Gravity Flows ◽

Platform Margin ◽

Water Carbonate

The utility of benthic foraminifera in bathymetric interpretation of clastic depositional environments is well established. In contrast, bathymetric distribution of benthic foraminifera in deep-water carbonate environments has been largely neglected. Approximately 260 species and morphotypes of benthic foraminifera were identified from 12 piston core tops and grab samples collected along two traverses 25 km apart across the northern windward margin of Little Bahama Bank at depths of 275-1,135 m. Certain species and operational taxonomic groups of benthic foraminifera correspond to major near-surface sedimentary facies of the windward margin of Little Bahama Bank and serve as reliable depth indicators. Globocassidulina subglobosa, Cibicides rugosus, and Cibicides wuellerstorfi are all reliable depth indicators, being most abundant at depths >1,000 m, and are found in lower slope periplatform aprons, which are primarily comprised of sediment gravity flows. Reef-dwelling peneroplids and soritids (suborder Miliolina) and rotaliines (suborder Rotaliina) are most abundant at depths <300 m, reflecting downslope bottom transport in proximity to bank-margin reefs. Small miliolines, rosalinids, and discorbids are abundant in periplatform ooze at depths <300 m and are winnowed from the carbonate platform. Increased variation in assemblage diversity below 900 m reflects mixing of shallow- and deep-water species by sediment gravity flows.

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