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Updated: Nov 3, 2025

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Making marinas bivalve friendly for enhanced biodiversity outcomes.

L W Adams1, R L Morris1, R B Hull1

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Summary

Seeding artificial marine structures with mussels (Mytilus galloprovincialis) reduced invasive species. Mussel droplines under pontoons showed the best results for mussel survival and biodiversity in marina environments.

Keywords:
Artificial structureBiodiversityBivalveBreakwaterPilingPontoon

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Area of Science:

  • Marine biology
  • Ecology
  • Aquaculture

Background:

  • Artificial marine structures like pilings and pontoons are replacing natural coastlines.
  • These structures negatively impact marine ecosystems, especially in marinas, by promoting invasive species.

Purpose of the Study:

  • To assess the effectiveness of seeding artificial structures with mussels (Mytilus galloprovincialis) to mitigate invasive taxa colonization in a marina.
  • To compare different mussel seeding methods and locations for their impact on native and invasive species.

Main Methods:

  • Mussel-seeded ropes were deployed on various artificial structures (pilings, pontoons, breakwaters) in a marina.
  • Interventions included mussel ropes and droplines under pontoons.
  • Data on mussel survival, growth, and species richness (native and invasive) were collected over six months.

Main Results:

  • Droplines under pontoons exhibited the highest seeded mussel survival and growth.
  • These droplines also showed increased richness of both native and invasive taxa, and a higher proportion of invasive to native taxa.
  • Mussel ropes on intertidal structures enhanced native taxa biomass, while those on subtidal structures reduced invasive taxa biomass.

Conclusions:

  • Mussel seeding interventions show potential for managing invasive species in marinas.
  • Droplines under pontoons were most effective for mussel growth and survival, but also increased overall species richness.
  • Further research is needed to determine if these methods can be scaled up to enhance marina biodiversity and ecological function.