Bird Life Telemark, Telemark branch and Jomfruland bird station have compiled data from 50 years of seabird breeding along the Telemark coast. The report provides an important insight into the changes and composition of species breeding in and around Jomfruland National Park.
The authors themselves write in the introduction that:
Seabird monitoring under the auspices of Birdlife Norway, Telemark branch and Jomfruland bird station has been ongoing since 1974. A formidable voluntary effort has been made by a number of people over the years to collect this data. They constitute one of the longest continuous monitoring series of Norwegian nature in existence. Total counts have been made along the entire Telemark coast, counted at three different times to capture early and late breeding species in the 27 reserves established in 1978. The number of nests, eggs and chicks is counted three times at eight selected seabird locations with good populations of many species. Sandwich terns are monitored in one large archipelago area in order to identify annual changes in breeding sites. Eider (and eventually cormorant) males have been counted by air annually. All methods have their strengths and weaknesses. However, the changes in the seabird population are so great during this period that they are well captured by all the different methods.
You can read and download the report in its entirety by clicking on the link Results from 50 years of monitoring seabird breeding populations on the Telemark coast
