Olav Gjærevoll (24 September 1916 – 30 August 1994) was a Norwegian botanist and politician for the Labour Party. Gjærevoll was a professor of botany at the University of Trondheim from 1958 to 1986, and was a specialist in alpine plants. In politics, he served as Minister of Social Affairs from February to August 1963 and again from September 1963 to October 1965; as the last Minister of Pay and Prices from 1971 to 1972 and as the first Minister of the Environment from May to October 1972. He also served as Mayor of Trondheim from 1958 to 1963 and again from 1980 to 1981.
Biography
Early life and education Olav Gjærevoll was born in 1916 and grew up on a small farm at the foot of Tronfjell mountain in Norway. From his childhood, he developed a fascination with the alpine flora of the mountain regions. His path to higher education was initially hindered by economic difficulties. When he finally began university studies, the outbreak of World War II interrupted his academic progress. In 1941, Gjærevoll fled to Sweden as he was involved in the resistance movement against the Nazi occupation of Norway. During his exile in Sweden, Gjærevoll's academic career took a major turn when he connected with Professor Gustaf Einar Du Rietz, the influential head of plant biology at Uppsala University. Du Rietz assigned him to study the vegetation on the border mountains between Sweden and Norway, focusing on Torne lappmark and the field station established there. After the war ended, Gjærevoll completed his undergraduate degree in 1946 with a thesis on the vegetation in the snowbeds of Oviksfjellen. He later expanded this research to encompass the vegetation throughout the Scandinavian Mountains, which became the basis for his doctoral dissertation defended in 1956.
Academic career Gjærevoll was appointed professor of botany at the Royal Norwegian Society of Sciences and Letters' Museum (Det Kongelige Norske Videnskabers Selskab) in 1958. He later became the museum's director in 1974, a position he held until 1980. During his tenure, he played a pivotal role in the process that led to the establishment of the University of Trondheim. As an alpine botanist, Gjærevoll became deeply interested in the overwintering theory (also known as the glacial survival hypothesis), which addresses how certain plant species may have survived the ice ages in Scandinavia. He emerged as one of the theory's most forceful defenders, contributing to the academic discourse on plant migration and survival strategies during glacial periods. Gjærevoll was not only a researcher but also an enthusiastic photographer and lecturer. He travelled extensively throughout Norway, presenting slide shows and delivering lectures, often at folk academies. This approach made him a popular academic figure among the general public, effectively bridging the gap between scientific research and public understanding.
Political career Alongside his scientific pursuits, Gjærevoll developed a substantial political career. He served as the mayor of Trondheim for several years and was elected to the Storting (Norwegian Parliament). His political service extended to ministerial positions in three different governments, most notably as Minister of Environmental Protection. In this capacity, he successfully championed several major conservation initiatives, including the establishment of national parks and protected areas, advancing the preservation of Norwegian natural environments. His political work was deeply informed by his scientific understanding of ecosystems and biodiversity.
Scientific contributions
The glacial survival theory Gjærevoll's most significant scientific contribution was his comprehensive work on the glacial survival theory. This theory, which emerged as a byproduct of Axel Blytt's groundbreaking ideas from 1876, concerns how plant species migrated and populated Scandinavia after the ice ages. The theory posits that not all of Scandinavia was completely covered by ice during glacial periods, and that some plant species might have survived in ice-free refugia or nunataks (mountain peaks protruding above the ice sheets). In February 1959, Gjærevoll delivered a lecture titled Overvintringsteoriens stilling i dag ("The position of the theory of glacial survival today") at the Royal Norwegian Society of Sciences and Letters. In this presentation, he systematically summarised the arguments for the glacial survival theory, examining botanical evidence and distribution patterns that suggested certain plant species had survived the ice ages locally rather than completely recolonising Scandinavia afterwards. Gjærevoll acknowledged that while most of the available evidence consisted of indications rather than definitive proof, the cumulative weight of these indications was compelling enough to support the theory. He called for interdisciplinary cooperation, particularly with geologists, to establish more concrete evidence for the theory.
Field research and publications Gjærevoll conducted extensive field research throughout the Scandinavian mountain range, with a particular focus on snowbed vegetation. His doctoral dissertation on this subject became a foundation for understanding alpine plant communities in Scandinavia. He extended his research beyond Norway, travelling to southern Greenland to study Jensen's Nunataks, where he examined plant life on these ice-free mountain peaks to better understand how similar areas in Norway might have supported plant life during glacial periods. His field guide Fjellflora ("Mountain Flora"), first published in 1952 and continuously updated until 2010, became a standard reference work for botanists and nature enthusiasts interested in Scandinavian alpine flora. In 1950 he issued the exsiccata (sets of dried herbarium specimens) M. Foslie: Lithothamnia selecta exsiccata distributing specimens collected by Mikael Heggelund Foslie.
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