Ownership of a connected university
Lecture by Hans de Kroon, professor of Plant Ecology at Radboud University. Delivered on Thursday 21 May 2026 in Nijmegen.
I don’t know about you, but when it’s my birthday, there’s always a moment when I look back on the past year, and also on what lies ahead. Today’s Dies Natalis celebration, the university’s birthday, is also a good opportunity for this kind of reflection. Looking at the history of our university, I see many moments of reflection and readjustment. Do we still matter, are we still relevant? That is how we went from being the Catholic University to becoming Radboud University. Where do we stand at this juncture in time? I would like to share my reflections with you, drawing on the wonderful new theme for this year, ‘connecting’, and I will introduce this based on my personal research experience here at Radboud University.
From birds to the decline of insects
I find the formulation of hypotheses to be an exciting aspect of scientific practice. What is the general validity of the scientific concept developed, and what are the implications? The most exciting part is then testing the hypothesis through experiments or new observations. Is our worldview correct? But that is only possible if the hypotheses are testable.
In collaboration with SOVON Bird Research, here on Radboud University campus, we have analysed long-term data on bird populations. These revealed a negative correlation between the vitality of songbirds and an agricultural pesticide . A neonicotinoid, a notorious insecticide. Our hypothesis was that the birds were not being poisoned directly, but that they had too little food, too few insects. But this seemed destined to remain just a hypothesis, as long-term data on the bulk of the insect population appeared not to exist. Until a group of German entomologists suddenly turned up at our door.
The Krefeld Entomological Society, an association of mainly amateur entomologists, had a large dataset on insect development in Germany. They were very concerned and asked if we could analyse that data thoroughly and publish it. We soon saw that the data had been collected with ‘gründliche’ precision, very well standardised and documented. In short, a dataset worthy of scientific use. Our analysis showed that flying insect populations in protected areas had declined by three-quarters over a period of less than 30 years . ‘Dramatic decline in insects’ was the headline on the front page of the national newspaper NRC.
The figure then spread around the world at lightning speed, leading to, for example, in-depth articles such as that in the New York Times Magazine . The term ‘Insect Apocalypse’ coined here is not entirely unfounded when you consider the crucial role insects play in ecosystems. Moreover, insect larvae are indispensable to healthy soils and waters.