Study

Ecological enhancement of coastal engineering structures: passive enhancement techniques

  • Published source details MacArthur M., Naylor L.A., Hansom J.D. & Burrows M.T. (2020) Ecological enhancement of coastal engineering structures: passive enhancement techniques. Science of the Total Environment, 740, 139981.

Actions

This study is summarised as evidence for the following.

Action Category

Create large protrusions (>50 mm) on intertidal artificial structures

Action Link
Biodiversity of Marine Artificial Structures

Create large ridges or ledges (>50 mm) on intertidal artificial structures

Action Link
Biodiversity of Marine Artificial Structures
  1. Create large protrusions (>50 mm) on intertidal artificial structures

    A replicated, controlled study in 2015–2017 on an intertidal seawall on open coastline in the UK (MacArthur et al. 2020) found that boulders positioned with large protrusions on their upper surfaces, along with large ridges, supported similar macroalgae and invertebrate species richness and barnacle Semibalanus balanoides abundance, but higher limpet Patella vulgata abundance, than boulders positioned randomly. Boulders positioned with large protrusions and ridges on their upper surfaces supported similar macroalgae and invertebrate species richness (4 species/boulder) and barnacle abundance (data not reported) but more limpets (82 limpets/boulder) than boulders positioned randomly (4 species/boulder, 27 limpets/boulder). It is not clear whether these effects were the direct result of creating large protrusions or ridges. Ten granite boulders (width: 2 m) were intentionally positioned with naturally-occurring large protrusions and/or ridges on their upper surfaces (average 4/boulder) and ten were positioned randomly (1/boulder) at mid-highshore in a granite boulder seawall during construction in 2015–2017. Protrusions/ridges were 100–800 mm high (other dimensions/spacing not reported). Macroalgae and invertebrates on the upper surfaces of boulders were counted during low tide in June 2017.

    (Summarised by: Ally Evans)

  2. Create large ridges or ledges (>50 mm) on intertidal artificial structures

    A replicated, controlled study in 2015–2017 on an intertidal seawall on open coastline in the UK (MacArthur et al. 2020) found that boulders positioned with large ridges on their upper surfaces, along with large protrusions, supported similar macroalgae and invertebrate species richness and barnacle Semibalanus balanoides abundance, but higher limpet Patella vulgata abundance, than boulders positioned randomly. Boulders positioned with large ridges and protrusions on their upper surfaces supported similar macroalgae and invertebrate species richness (4 species/boulder) and barnacle abundance (data not reported) but more limpets (82 limpets/boulder) than boulders positioned randomly (4 species/boulder, 27 limpets/boulder). It is not clear whether these effects were the direct result of creating large ridges or protrusions. Ten granite boulders (width: 2 m) were intentionally positioned with naturally-occurring large ridges and/or protrusions on their upper surfaces (average 4/boulder) and ten were positioned randomly (1/boulder) at mid-highshore in a granite boulder seawall during construction in 2015–2017. Ridges/protrusions were 100–800 mm high (other dimensions/spacing not reported). Macroalgae and invertebrates on the upper surfaces of boulders were counted during low tide in June 2017.

    (Summarised by: Ally Evans)

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