It's a hidden global change: away from the public eye, residues of medicines in water have been causing increasing disruption. They can kill aquatic animals, and play havoc with their food web and reproductive cycle. An international team of researchers led by the NIOO makes an urgent case for better wastewater treatment and biodegradable pharmaceuticals.

How can we tell if climate change really affects the population dynamics of a species? "Changes to behaviour, weight or appearance don't always mean population numbers are de- or increasing." NIOO-researcher Martijn van de Pol presents a novel approach to answering the question in the June issue of Ecology Letters.

Massive growth of submerged aquatic plants can be a nuisance, especially in summer. It's up to water managers to limit the inconvenience for swimmers, boats and fishermen in a way that is both responsible and cost-effective. Michiel Verhofstad defended his PhD thesis this week on the 'root' causes of the problem, and how best to tackle it.

The impact of biological clocks on nature and our lives is enormous. Jet lag, mating, bird migration: so much depends on the keeping of time in our bodies and those of other organisms. The latest issue of the world's oldest scientific journal is dedicated entirely to the topic. Featuring researchers from the Netherlands.

Most plants that expand their range within their own continent - e.g. under pressure from climate change - won't end up dominating other species. According to NIOO-researcher Rutger Wilschut, possible invasiveness may be predicted by root chemistry not found in native plants.