M.Sc. Léa Joly
|Division||Biosciences | PlanktoSERV|
Alfred Wegener Institute
( Room A-208)
Direct (e.g., temperature and pH) and indirect (e.g., food quality and quantity) impacts of global change put marine organisms under high pressure. Rapid environmental degration may have huge effects on species survival and development, especially for organisms already under harvesting pressure like fish. Early life stages are a critical part in the fish life cycle, directly influencing recruitment and population fluctuations. However, studies on fish larvae have mostly focused on abiotic changes, such as increasing temperature and decreasing pH, and mainly use single-stressor approaches to investigate the impacts of climate change. Understanding how fish larvae will cope with the combined impact of multiple stressors is important to understand how fish stocks could be impacted in the future. Atlantic herring, which is a high economic and social value species, with a key role in the North Sea and Eastern English Channel food webs, is the biological model for my study.
The aim of my PhD project is to realistically assess how the combined direct and indirect effects of global change will impact the development of Atlantic herring larvae under different scenarios. I conduct multi-stressor experiments by simultaneously manipulating temperature, pH, and food quality in order to reflect plausible future changes in the marine environment. As response parameters, I monitor the survival and development of herring larvae using condition and trophic indices.