Microbial biofilms facilitate adhesion in biofouling invertebrates

Area of Science:

• Marine biology
• Ecology
• Microbiology

Background:

• Biofilms on submerged surfaces influence marine invertebrate and algal settlement.
• Understanding the role of microbial layers in biofouling is crucial for marine industries.

Purpose of the Study:

• To investigate how natural biofilms affect the adhesion strength of settling invertebrate larvae.
• To determine if biofilm presence universally impacts invertebrate attachment or varies by species and developmental stage.

Main Methods:

• Settling larvae of four invertebrate species were exposed to clean and biofilm-coated surfaces.
• Larval removal forces were precisely measured under controlled flow conditions.
• Adhesion strength was compared between clean and biofilm-treated surfaces for each species.

Main Results:

• Biofilms significantly increased adhesion strength for Phallusia nigra (ascidian), Hydroides elegans (tubeworm), and Balanus amphitrite (barnacle).
• The effect of biofilms on adhesion strength varied across different developmental stages for these species.
• Bugula neritina (bryozoan) attachment strength was not significantly affected by the presence of biofilms.

Conclusions:

• Biofilm presence can substantially alter invertebrate larval adhesion strength, with species-specific and stage-specific variations.
• Adhesive strength and composition likely differ among invertebrate taxa and recruitment stages.
• This research opens new avenues for understanding and managing biofouling through microbial interactions.