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Investigation of the link between phytoplankton and nutrients dynamic in Lake Geneva

Defense Thèse de doctorat : Univ. Genève, 2017 - Sc. 5073 - 2017/05/04
Abstract Lake Geneva long-term changes of phytoplankton biomass and environmental parameters revealed a silicate influence between1980-1989, a transition phase between 1989-1995/99, a mild phosphorus influence between 1995/99-2007 and a period of strong phosphorus influence between 2007-2012. Moreover, shifts in the phytoplankton community from species characteristic of eutrophic waters towards those characteristic of meso-oligotrophic waters were reported. Yet, total phytoplankton biomass remained un-changed. Additionally, micronutrients had not a critical role in Lake Geneva, possibly due to low phytoplankton biological requirements or efficient recycling. Furthermore, species with high light requirement were dominant in the upper-lake (aggregated around 10m) and were thus more likely seasonally nutrient limited. In the lower-lake, species adapted to low light intensities dominated (up to 25m) and benefited from a greater nutrient supply; they were thus more likely seasonally transiently light and nutrient limited. The outcomes of this thesis are expected to benefit Lake Geneva monitoring program.
Keywords LakesPhytoplanktonEnvironmental monitoring
URN: urn:nbn:ch:unige-968307
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Thesis (6.7 MB) - public document Free access
Research group Marine and Lake Biogeochemistry
Swiss National Science Foundation: PP00P2_138955
(ISO format)
MOISSET, Sophie. Investigation of the link between phytoplankton and nutrients dynamic in Lake Geneva. Université de Genève. Thèse, 2017. doi: 10.13097/archive-ouverte/unige:96830 https://archive-ouverte.unige.ch/unige:96830

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Deposited on : 2017-09-18

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