The central theme in my work as marine ecologist is the marine food web, which I study in various places, ranging from estuaries (e.g. Dutch Delta), coastal seas (e.g. North Sea and Caribbean Sea), fjords (e.g. Greenland and Antarctica) and open ocean (e.g. Atlantic and Pacific seafloor).
The food web is a relatively simple concept: organisms in the marine environment are linked by interactions that represent the transfer of energy and nutrients. Because of the high biodiversity in the marine ecosystem, the complexity of food webs is however staggering and deciphering these interactions is a challenging task. For example, we can never measure all interactions at the same time, and we also discover new interactions meaning that we have to add linkages to the food web. In my research I use a range of techniques to understand marine food webs, such as stable isotopes at natural abundance and tracer level, compound-specific analysis (carbohydrates, fatty acids and amino acids) and food web modelling (e.g. linear inverse modelling) and data assimilation. A link to several food web modelling and data science tools can be found here.
Many food web studies were done in international collaborations in EU-projects (e.g. HERMES, HERMIONE and CoralFISH) and in the deep-sea mining projects MIDAS and "Ecological aspects of deep-sea mining" (JPI-Oceans). Another topic I worked on was the functioning of warm- and cold-water coral reefs, which is primarily focussed on the mechanisms that allow these hotspot ecosystems to flourish, including the interaction of hydrodynamics and organic matter transport.
Read more +More recently, we also started working on the food web in the water column. For decades, zooplankton has been captured from different depths by pulling a fine net through the water. However, this method has many limitations: by definition, you acquire a collection of organisms from different locations and depths, and these organisms are pulled from the water in a “knocked out” state. We can avoid these problems with a brand-new imaging system (see image above). With the help of a camera that photographs the organisms of 500 micrometres to 2 centimetres in size several times per second, we can gain an accurate image to the nearest centimetre of which organisms live at a certain depth and how their occurrence relates to environmental conditions. Eventually, we want to have computers automatically classifying these images and save an enormous amount of manpower behind the microscope. Furthermore, with this technique, we can see the organisms “in action” in their natural environment. I expect that, in the coming years, this imaging system will enable us to add a new dimension to analysing the marine food web. A dimension we could never have investigated using the old methods and mere manpower. Anna van der Kaaden made a very nice video on this work which you can find here.
Below a few links to items that have made it to the media on my work:
It was supercool to see that research by Jasper de Goeij (University of Amsterdam) and myself made it into a VWO school exam!
Publications |
Find all my publications on Google Scholar. Don't hesitate to get in touch in you want a copy. |
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