PhD research: Factors limiting marine connectivity at a species' range edge – the case of the pink sea fan, Eunicella verrucosa
The Pink Sea Fan (Eunicella verrucosa), is a cold-water octocoral, ranging from the north of Ireland to the Mediterranean Sea. Recognized as a priority species under the UK Post-2010 Biodiversity Framework and a Species of Principal Importance (UK Wildlife and Countryside Act 1981), many marine protected areas (MPAs) in the UK are designed to safeguard priority species like E. verrucosa. However, to effectively design MPAs, a comprehensive understanding of population connectivity and limiting factors at range edges is imperative.
Our multidisciplinary research approach integrates molecular ecology, histology, and ocean dynamic modelling to unravel E. verrucosa’s life history and connectivity. The molecular ecology approach employs whole genome sequencing (WGS) to capture genetic variations across the species' range. This enables us to explore fine-scale connectivity patterns and evidence of genetic adaptation to environmental extremes at range edges.
Histological analysis aims to elucidate reproductive processes, determine the timing of gonadal development as well as growth rates and temperature-related pelagic larval duration (PLD).
Additionally, partial tracking models (PTM) simulate larvae connectivity throughout the species' range, helping to identify key populations that uphold gene flow to edge populations, adding a contemporary component to support our genetic research. Furthermore, these models facilitate the assessment of particle dispersal, offering insights into potential settlement regions.
In summary, we aim to evaluate the effectiveness of the current MPA network in preserving connectivity within Pink Sea Fan populations. By integrating genetic insights, biological data, and modelling techniques, we strive to contribute valuable information for the conservation of this remarkable species.