MSc internship diatom and pollen records IJsselmeer’s sedimentary diary

Why

Lake IJsselmeer is the largest freshwater body in the Netherlands and an important source of drinking water. Like other freshwater ecosystems, it experienced a peak in eutrophication during the 80s, after which nutrient loads began to decline (Frenken et al., 2023). Very little is known about the trophic history of Dutch freshwater ecosystems prior to the invention of synthetic fertilizer. To assess the success of water quality measures, restoration efforts, and set realistic targets, we need to reconstruct historical conditions using sediment cores.

What

Here, we propose to establish a detailed assessment of the trophic state of IJsselmeer using pigments, diatoms, and geochemistry of its sediments.

The candidate will focus on producing diatom and pollen records for dating (by matching them with other cores). She/he will also provide information on the trophic state through its species distribution. The intern also has access to core-scanning data from XRF and hyperspectral scanning.

When

5-8 months of work starting in November/December 2026; for these, count on a 30-60 ECTS thesis.

Who

MSc students with a bachelor’s in biology, geology, physical geography, or environmental sciences and a keen interest in freshwater quality in the Netherlands. All additional ideas are welcome. Students/Interns are encouraged to become involved in outreach activities.

Key papers

• https://doi.org/10.1007/s10750-009-9816-7
• https://edepot.wur.nl/117747

Methods

• Fieldwork on IJsselmeer
• Core-opening, subsampling & chemical extractions
• Microscopy

Skills gained

• Prepare for a PhD in paleo-sciences (palynology, paleolimnology, paleoceanography).
• Become an expert in fossilized algal remains, pollen, and diatom taxonomy.
• Prepare for any work at water boards, RWS, and consultancy companies.

Deliverables

• Written report determined following the guidelines of your university.
• Encouraged: An alternative product: e.g., a short film, an infographic, or a popular scientific article.