Population Connectivity and Dispersal in Marine Systems

Population connectivity in marine environments arises from the movement of individuals and their genes among geographically separated habitats. In most benthic and reef species, connectivity is governed by the pelagic larval phase: tiny propagules released by adults drift under the influence of ocean currents, buoyancy and behaviour before settling. Connectivity shapes genetic diversity, resilience to environmental change and species’ capacity to recolonise disturbed areas. It underpins the effectiveness of marine protected area (MPA) networks, fisheries management and efforts to conserve biodiversity. Recent advances integrate genomic markers, biophysical dispersal models and tracking technologies to reveal the interplay between life-history traits (such as pelagic larval duration), seascape features (currents, fronts and habitat configuration) and post-recruitment processes. These interdisciplinary approaches deliver quantitative estimates of dispersal kernels, identify source and sink populations, and guide spatial planning by highlighting corridors of gene flow and barriers to movement. Improved understanding of connectivity supports adaptive strategies for safeguarding marine ecosystems under climate change and intensifying human pressures.

Research from Nature Portfolio

Recent studies have combined high-resolution particle tracking with genetic assays to delineate fine-scale connectivity in economically important species. In mid-latitude fjords of Scotland, multidisciplinary work on blue mussel larvae revealed a predominant south-to-north transport pattern and identified five distinct genetic clusters. Agreement between biophysical model predictions and observed gene-flow patterns provides a template for optimising mussel farm placement and enhancing larval supply to sustain wild and cultured stocks.

A comprehensive investigation of Atlantic meagre integrated genome-wide single nucleotide polymorphism data, larval dispersal simulations and adult biotelemetry. Findings demonstrated clear differentiation between European and African subpopulations, limited average larval dispersal (< 60 km) and wide-ranging adult movements up to 500 km. These results support treating meagre stocks as separate management units and highlight key spawning sites where targeted MPAs could bolster recruitment and maintain genetic connectivity.

Population Connectivity and Dispersal in Marine Systems publication trend

The graph below shows the total number of articles in population connectivity and dispersal in marine systems across all publications each year (not limited to Nature Index journals).

Technical terms

Population connectivity: The exchange of individuals and genes among spatially separated populations via dispersal and migration.

Pelagic larval duration (PLD): The length of time larvae spend in the water column before settling, influencing dispersal distance.

Biophysical model: A simulation that couples physical oceanographic data with biological parameters to predict dispersal pathways.

Self-recruitment: The proportion of larvae that settle and mature in their natal population rather than dispersing elsewhere.

Metapopulation: A network of local populations connected by dispersal, where local extinctions can be countered by recolonisation.

References

1. Estimating blue mussel (Mytilus edulis) connectivity and settlement capacity in mid-latitude fjord regions. Communications Biology (2024).
2. Multidisciplinary estimates of connectivity and population structure suggest the use of multiple units for the conservation and management of meagre, Argyrosomus regius. Scientific Reports (2024).
3. Oceanic currents maintain the genetic structure of non-marine coastal taxa in the western Mediterranean Sea. npj Biodiversity (2023).
4. Connecting the dots: Applying multispecies connectivity in marine park network planning. Biological Conservation (2024).
5. Unexpected mismatches in population structure among marine mussel life‐history stages reveal the true scales of planktonic larval dispersal. Limnology and Oceanography Letters (2024).