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Black-headed gull

At the beginning of the 1990's attention was drawn to the fact that the Black-headed Gull population declined in all of Sweden, a national project was initiated to investigate the causes and Kvismare Bird Observatory participated in a study in Rysjön’s colony. The production of juveniles was measured, nestling weight at different ages and predation was studied. It was found that too few young birds survived and these results were applied to more places around Sweden.

Census of Sörön

In 1965 a census began of a deciduous forest, called Sörön, it lasted for 40 years with the same person carrying out the census, until 2004. It has since continued, in a somewhat modified form.

Hooded crow

This species has been surveyed at regular intervals since 1968. Nowadays, the species is an important predator in the bird community at Kvismaren. Therefore, it has always been valuable to have knowledge of the population size. There was a strong focus on the crows being associated with mercury poisoning in the 1960s. A 1964 census showed that there were only nine pairs in an approximately 5000-acre survey area around Kvismare lakes. Thereafter, there has been a strong increase and stabilization in recent years.