Year: 2024
Type: article
Abstract: The extreme conditions of the deep-sea environment, including limited light, low oxygen levels, high pressure, and nutrient scarcity, create a natural habitat for deep-sea bacteria. These remarkable microorganisms have developed unique strategies to survive and adapt to their surroundings. However, research on the diversity of deep-sea bacteria, both culture-dependent and culture-independent, in Indonesian waters remains insufficient. This study focused on exploring the biodiversity of deep-sea bacteria, specifically in the Makassar and Lombok Strait, the main Indonesian throughflow pathway characterized by relatively fertile water, which serves as an important deep-sea region. High-throughput DNA sequencing of full-length 16S rRNA was employed to construct a genomic database. The results of the bioinformatic analysis revealed that two stations, 48 and 50 (Makassar Strait), exhibited a more similar community structure of deep-sea bacteria than did station 33 (Lombok Strait). Among the predominant phyla found at a depth of 1000 m, the top ten were Proteobacteria, Firmicutes, Bacteroidetes, Actinobacteria, Planctomycetes, Acidobacteria, Nitrospinae, Verrucomicrobia, Candidatus Melainabacteria, and Cyanobacteria. Furthermore, the genera Colwellia, Moritella, Candidatus Pelagibacter, Alteromonas, and Psychrobacter consistently appeared at all three stations, albeit with varying relative abundance values. These bacterial genera share common characteristics, such as psychrophilic, halophilic, and piezophilic tendencies, and are commonly found in deep-sea ecosystem. The environmental conditions at a depth of 1000 m were relatively stable, with an average pressure 10 MPa, temperature 4.68 °C, salinity 34.58 PSU, pH 8.06, chlorophyll-a 0.29 µg/L, nitrate 3.19 µmol/L, phosphate 6.32 µmol/L and dissolved oxygen (DO) 2.90 mg/L. The bacterial community structures at the three sampling stations located at the same depth (1000 m) exhibited similarities, as indicated by the closely aligned similarity index values.
Source: Scientific Reports
Language: English
Subfield: Ecology
Field: Environmental Science
Domain: Physical Sciences
SDG: Life below water
Open Access status: gold
Estimated APC paid: $2,590
Awards: Observations and Analysis Throughflow Indonesian Seas, Upwelling, and Mixing Physics (TRIUMPH) Data, THIS PROPOSAL BUILDS ON OUR EARLIER WORK (SUPPORTED BY THE PHYSICAL OCEANOGRAPHY PROGRAM) SEARCHING FOR AND ANALYZING THE SIGNATURES OF TIDAL MIXING IN HIGH-RESOLUTION SEA-SURFACE TEMPERATURE DATA. THE CLEAREST SIGNATURE USUALLY ARISES AS A PRONOUNCED SPRING-NEAP TIDAL SIGNAL IN LONG TIME SERIES OF SST DATA. STRONG SPRING-TIDE CURRENTS INDUCE GREATER MIXING THEREBY SLIGHTLY LOWERING SST AS COLD SUBSURFACE WATER TO BROUGHT NEARER THE SURFACE. OUR PREVIOUS WORK CONCENTRATED ON THE INDONESIAN SEAS WHERE WE SHOWED THAT A WELL-KNOWN AND HIGHLY CITED 1996 PAPER BY FFIELD&GORDON GIVES -- OWING TO INADEQUACIES OF SST DATA AVAILABLE TO THEM -- A RATHER MISLEADING PICTURE OF THE TIDAL MIXING IN THAT REGION.
OpenAlex ID: W4403792212