Substrate Specificity of Biofilms Proximate to Historic Shipwrecks

Area of Science:

• Marine microbiology
• Environmental science
• Biofouling

Background:

• Anthropogenic structures like shipwrecks and platforms are increasing on the seabed.
• These structures act as substrates for microbial biofilm formation.
• Environmental conditions and substrate characteristics influence biofilm development, but their relative importance is unclear.

Purpose of the Study:

• To investigate the substrate- and site-specific effects of built structures on short-term marine biofilm composition.
• To determine whether substrate material or location is the dominant factor shaping biofilm microbiomes.
• To understand the functional potential of biofilms colonizing different artificial substrates.

Main Methods:

• Deployment of steel and wood surfaces near historic shipwrecks in the Gulf of Mexico for four months.
• DNA extraction from developed biofilms on both substrates.
• Metagenomic sequencing and subsequent bioinformatics analysis to assess taxonomic composition and functional genes.

Main Results:

• Biofilm taxonomic composition differed significantly between steel and wood substrates and among study sites.
• Substrate type was identified as the primary factor influencing biofilm community structure.
• Steel biofilms exhibited higher gene abundance for biofilm formation, sulfur, iron, and nitrogen cycling.
• Wood biofilms showed greater abundance of genes for manganese cycling and methanol oxidation.

Conclusions:

• Substrate composition is a critical determinant of marine biofilm microbiome structure and function.
• Marine biofilms on anthropogenic structures can play a role in deep-sea nutrient cycling.
• Understanding these microbiomes is essential for assessing the ecological impact of artificial seabed structures.