Making demographic processes visible

The demography of selected species is monitored over as long a period as possible. The aim is to better understand the causes of population changes. This information is used to inform conservation and management measures and for scientific purposes.

Survival data are collected by ringing, and breeding data are collected by observing nests. These data are mainly sampled by volunteers, either as part of species-specific projects (population studies) or at the Constant Effort sites. Data collection is coordinated by the ringing centre. These data are periodically analysed with population count data and published in reports or scientific journals.

Knowledge of demography is crucial to understanding why bird populations have changed and how they will change in the future. Predictions are particularly important when the environment is changing rapidly, for example due to habitat loss or climate change.

Analysis of data on kestrels has shown that individuals breeding in nest boxes produce surpluses that disperse to neighbouring populations. This shows that the installation of nest boxes not only has a local effect, but can also have a positive impact on other populations, making them a very effective conservation measure.

• Storch Schweiz