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Differences in Intertidal Microbial Assemblages on Urban Structures and Natural Rocky Reef.

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Artificial seawalls host different bacterial communities than natural rocky shores. However, when substrate and orientation are controlled, microbial communities on both surfaces become similar, indicating habitat-specific factors influence urban seascape biofilms.

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Area of Science:

  • Marine biology
  • Microbial ecology
  • Coastal ecology

Background:

  • Coastal zones are increasingly modified by artificial structures like seawalls, impacting natural habitats.
  • Artificial structures support different macrofaunal communities, but microbial community differences in urban seascapes are poorly understood.
  • Microbial assemblages are crucial for fundamental ecological processes in marine environments.

Purpose of the Study:

  • To compare bacterial communities in intertidal biofilms between artificial seawalls and natural rocky shores.
  • To investigate the influence of artificial constructions on marine microbial community structure and function.
  • To determine if differences in bacterial communities are due to environmental factors or intrinsic habitat characteristics.

Main Methods:

  • Comparison of bacterial communities in intertidal biofilms on seawalls and rocky shores in Sydney Harbour.
  • Sampling of newly formed biofilms after 3 weeks on cleared plots.
  • Sequencing of the 16S rRNA gene using Illumina Miseq.
  • Deployment of recruitment blocks to control for substrate, age, and orientation variables.

Main Results:

  • Bacterial community structure differed between seawalls and rocky shores when sampled directly from plots.
  • When substrate material, age, and orientation were standardized using recruitment blocks, bacterial communities were similar across habitats.
  • Differences in bacterial communities on seawalls are likely due to intrinsic habitat factors rather than broad environmental variations.

Conclusions:

  • Habitat-specific factors like orientation, complexity, or predation, rather than general environmental conditions, drive changes in bacterial communities on artificial structures.
  • This study is among the first to compare intertidal microbial communities on natural and artificial surfaces, revealing significant ecological differences.
  • These findings have potential implications for biofilm function and the settlement of larger marine organisms (macrofauna) in urban seascapes.