Mr Jonathan Demmer


Contact info


Phone: 0044 (0)1248388225

Address: School of Ocean Sciences, Askew St, Menai Bridge, LL59 5AB, United Kingdom


I am a PhD student at the school of Ocean Sciences, my project focuses on mussel larvae dispersal in the Irish Sea.


The main objectives are to understand the temporal and spatial variability of North Wales mussel (Mytilus edulis L.) population. To reach this objectives, we used an hydrodynamic model (Telemac) coupled to a Particle tracking model (Matlab). Ww study how physical and biological parameters can affect mussel connectivity and/or dispersal from an original mussel bed located in the Menai Strait and managed by Bangor mussel companies.

Indeed, the North Wales coast is host to a large managed population of mussels (Mytilus edulis L.), nourished by a natural supply of phytoplankton advected through the energetic Menai Strait. The mussel beds are seeded and managed by an association of companies, including Extramussel Ltd. It is believed that a significant proportion of their seeded mussels go on to spawn naturally and disperse away from the mussel beds to settle at secondary grounds, yet their pathways and final settlement locations are unknown. It is in the interest of Extramussel to understand where the larvae go, so that they are able to manage their stocks efficiently and quantify their contribution to the wider ecosystem. As well as being of considerable scientific interest, the interaction of physical and biological processes that lead to larval dispersal can be a matter of economic importance in relation to the siting and management of mussel beds.

Research Activity at Previous HEIs

Research engineer in genetic, Ifremer, French Polynesia, “Genetic amelioration of the pearl oyster, Pinctada margaritifera

  • Creation and validation of pearl oyster families with a selected phenotype in hatchery
  • Planning, realization and control of field experiments (breeding program, experimental grafts, biometry and pearl qualification)
  • Mixed studies of environmental and genetic effects
  • Analysis of gene expression of the pearl quality traits (RNA extraction, qPCR)

Field assistant in marine ecology, Université de la Polynésie française

  • Planning, realization and control of field experiment (seawater analysis by filtration, studies of epiflora and epifauna of pearl oyster)

Research Assistant in marine ecology, Bodega Marine Laboratory, California, USA, “Study of interactions intra- and interspecific of littoral ecosystem”

  • Planning and realization of field experiments (Physical and biological sampling, biometry)
  • Maintenance of laboratory experiments
  • Analyzis of collected data

Engineer internship, Scottish Ocean Institute, St Andrews, Scotland, Study of genes expression in tentacles and operculum of Pomatoceros Lamarckii during regeneration and development”

  • Planning, realization and control of laboratory experiments (In situ hybridization, qPCR)
  • Writing weekly report of development and physiology of P.Lamarckii.

Grant Awards and Projects


PRIMaRE Early Career Researcher

Contact Info


Phone: 0044 (0)1248388225

Address: School of Ocean Sciences, Askew St, Menai Bridge, LL59 5AB, United Kingdom

Research areas and keywords


  • Q Science (General) - Oceanography
  • QA75 Electronic computers. Computer science - Hydrodynamic model, Matlab
  • QH301 Biology - Mussel ecology, Benthic ecology

Education / academic qualifications

  • 2009 - Other , Environmental engineer
  • BA , Bachelor degree in biology
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