Site maintenance

Submitted by admin on 2 November 2025.

We are currently working on the site kvismaren.org. Things might look a bit messy from time to time.

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The summer 2020 at the Observatory

Submitted by admin on 15 April 2025.

In June... månad avslutades en intensiv vårsäsong med ett stort antal projekt. Trots en kall vår och första del av sommaren så fångar vi mycket ungfåglar. Studierna av jordbruksarter har utökats med intensiva studier av bl.a. sånglärkor. Den utsatta populationen av ortolansparv fortsätter att följas. I år var det också dags för kråkinventeringen som genomförs vart femte år.

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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.

Wetland surveys

Over time, restored areas around the lake have been surveyed to decipher breeding wetland species. In 1981, Lake Rysjön was restored. From 1982, all breeding wetland birds have been monitored and production of young calculated. In recent years, the Bird Observatory has had closer co-operation with the provincial government. From 2009, we have done censuses on all wetland birds for the provincial government covering all parts of the wetland nature reserve.

Moult in adult birds

Started in 1968 rather tentatively, a study of the moulting adult birds caught in Kvismaren began; this is when birds are replacing feathers completely after nesting. As of 1973, almost all the specimens caught in this category are investigated according to their moult. This take place on a special form; a schematic diagram of the wing and tail.
To date, over 10 000 moult cards have been completed.