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First name: Hannah
Last name: Marchant
Country: United Kingdom
Thesis Subject:
Nitrogen cycling in coastal permeable sediments
Education:
2005 - 2008 BSc (Hons) Marine Biology, University of Plymouth.
Thesis Title: Physiological responses of the limpet Patella vulgata to short term
hypercapnia
2008 – 2010 MSc Marine Microbiology, International Max Planck Research School of Marine Microbiology
Thesis Title: The effect of Ocean acidification on nitrogen cycling in coastal permeable
coastal sediments
2010 - Present PhD candidate within the Biogeochemistry department
Scientific Interests and Goals:
Recent studies have increased awareness of the importance of advectively dominated permeable or sandy coastal sediments in nitrogen cycling processes. Permeable sediments cover 70% of the continental shelf area and are controlled by advective pore water flushing which supplies the sediment with nutrient and oxygen rich water, stimulating organic matter mineralization and biogeochemical cycling. Permeable sediments have been characterized as having among the highest potential denitrification rates in the marine environment.

However, as yet we know very little about other nitrogen cycling processes within these sediments, including N2O production, dissimilatory nitrate reduction to ammonium and nitrification. My research focuses on these, and how they change seasonally. Additionally, highly variable oxygen and redox conditions mean that permeable sediments offer a fascinating environment in which to investigate how classically anaerobic processes such as denitrification and sulfate reduction respond to oxic conditions.
Selected Publications:
H. Marchant., P. Calosi & J. Spicer. Short-term exposure to hypercapnia does not compromise feeding, acid–base balance or respiration of Patella vulgata but surprisingly is accompanied by radula damage. Journal of the Marine Biological Association of the United Kingdom, 2010, 90(7), 1379–1384

C. Munn, H. Marchant & A.J. Moody. Defences against oxidative stress in vibrios associated with corals. FEMS Microbiology Letters , 2008, 281(1), 58-63