Related Experiment Video
Updated: May 23, 2026
14:44
Field Collection and Laboratory Maintenance of Canopy-Forming Giant Kelp to Facilitate Restoration
Published on: June 7, 2024
Artificial structures influence fouling on habitat-forming kelps
1Centre for Research on Ecological Impacts of Coastal Cities, School of Biological Sciences, Marine Ecology Laboratories A11, The University of Sydney, NSW 2006, Australia. e.marzinelli@unsw.edu.au
Biofouling
|March 29, 2012
Summary
Artificial structures in urban shorelines alter marine life. Kelp on artificial pilings hosted more bryozoans, including invasive species, than kelp on natural reefs, impacting biodiversity.
Area of Science:
- Marine Ecology
- Urban Ecology
- Invasive Species Biology
Background:
- Urbanized shorelines globally feature artificial structures, impacting marine habitats.
- The effect of artificial structures on fouling organisms is known, but their influence on habitat-forming species is less understood.
- Habitat-forming species, like kelp, create secondary substrata for other organisms.
Purpose of the Study:
- To compare the fouling communities on habitat-forming kelp (Ecklonia radiata) growing on artificial pier-pilings versus natural rocky reefs.
- To investigate how artificial structures influence the biodiversity and abundance of epibiota on secondary biogenic substrata.
- To assess the role of artificial structures in the dispersal of non-indigenous epibiota.
Main Methods:
- Field surveys comparing kelp-associated bryozoan assemblages on pier-pilings and rocky reefs.
- Sampling conducted at three distinct locations within Sydney Harbour.
- Quantitative analysis of bryozoan abundance and species composition on kelp from both artificial and natural substrata.
Main Results:
- Kelp on pier-pilings supported significantly different bryozoan assemblages compared to kelp on rocky reefs.
- Abundances of bryozoans, notably the invasive Membranipora membranacea, were significantly greater on kelp attached to pilings.
- Observed differences in fouling communities were consistent across different times and locations.
Conclusions:
- Artificial structures modify fouling communities on secondary biogenic habitats, not just primary substrata.
- These modifications alter local biodiversity and can facilitate the introduction and spread of non-indigenous epibiota.
- Understanding these ecological effects is crucial for predicting the impact of built structures on marine ecosystems.
Related Concept Videos
01:24Freshwater Microbial Ecology
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...
01:39Keystone Species
Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a pivotal role in the...
01:25Microbial Mats
Microbial communities forming biofilms and mats represent complex, spatially structured ecosystems where metabolic processes are stratified according to light, oxygen, and nutrient gradients. Biofilms are initial colonization stages, only a few millimeters thick, while mature microbial mats can reach centimeter-scale thickness and display intricate vertical organization. Their structural and functional heterogeneity allows microorganisms to occupy distinct ecological niches within a few...
01:19Other Algae
The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
01:29Biofilms
Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
01:28Biodeterioration
Biodeterioration refers to the unwanted alteration of materials caused by microorganisms—especially fungi—which damage both organic substrates (paper, wood, textiles) and inorganic ones (stone, plaster, glass). Unlike abiotic decay, biodeterioration results from biological activity that produces physical disruption and chemical degradation.Physical deterioration occurs as fungal hyphae penetrate pores, cracks, and surface irregularities. Hyphal turgor pressure, thigmotropic growth along...