Marine Invasive Species Risk Assessment and Management

Marine invasive species pose a profound challenge to global biodiversity, ecosystem services and coastal economies. Risk assessment for these non-native organisms typically combines pathway analysis—identifying vectors such as ballast water, hull biofouling and aquaculture escapes—with environmental matching and species-specific impact evaluation. Advances in molecular tools, notably environmental DNA (eDNA), have increased sensitivity of early detection, while horizon scanning methodologies enable prioritisation of potential invaders before establishment. Quantitative frameworks now integrate propagule pressure, establishment likelihood and effect factors to forecast ecological and socioeconomic consequences. Management responses span regulatory ballast water treatment standards, hull-cleaning regimes and the design of early warning and rapid response systems. Underpinning these actions are global monitoring networks and risk-based decision support tools that inform shipping protocol, port infrastructure design and restoration activities. Climate change, trade expansion and polar-opening trends are shifting invasion dynamics, rendering once-improbable incursions increasingly likely in high-Arctic and Antarctic waters. Hence, adaptive management combines surveillance, prevention and mitigation with stakeholder engagement across maritime sectors. Through unified international conventions and regionally tailored biosecurity measures, practitioners aim to minimise translocation vectors, strengthen detection capacity and reduce ecological impacts of marine invasions on a truly global scale.

Research from Nature Portfolio

Recent work has demonstrated the first successful settlement of a temperate mussel species in Antarctic subtidal habitats, confirming that shipping and shifting oceanographic barriers permit non-native colonisation at high latitudes. Genetic provenance analyses linked recruits to southern Patagonian source regions, while settlement monitoring showed full larval development under extreme conditions. This finding underscores the urgency of integrating vector analysis with climate projections and refining biosecurity protocols for polar shipping routes, illustrating how once-resilient biogeographic barriers can be breached.

Marine Invasive Species Risk Assessment and Management publication trend

The graph below shows the total number of articles in marine invasive species risk assessment and management across all publications each year (not limited to Nature Index journals).

Technical terms

Ballast water: Seawater carried in ship tanks to maintain stability, often transporting non-native organisms across regions.

Biofouling: Unwanted accumulation of microorganisms, plants, algae or small animals on wetted surfaces of ships or structures, serving as a vector for species transport.

eDNA: Fragments of genetic material shed by organisms into the environment, used for non-invasive detection of species presence.

Horizon scanning: Systematic identification and prioritisation of potential future invasive species based on expert judgement and environmental matching.

Propagule pressure: The quantity, frequency and diversity of organisms introduced into a new area, determining establishment likelihood.

Effect factor: A metric estimating the impact of an invasive species on native biodiversity, used in life cycle and risk impact assessments.

References

1. Horizon scanning of potential threats to high‐Arctic biodiversity, human health and the economy from marine invasive alien species: A Svalbard case study. Global Change Biology (2023).
2. Effect factors for marine invasion impacts on biodiversity. The International Journal of Life Cycle Assessment (2024).
3. First mussel settlement observed in Antarctica reveals the potential for future invasions. Scientific Reports (2020).