University. Lars (Lasse) grew up in Stockholm and became interested in natural history early on. His fascination with birds led him as a young man to the Ottenby ornithological station on the Island of Ö land. This, however, served as an entre´e to more serious biological studies, concentrating on fish biology. Driving a taxi to support himself, Lasse completed his dissertation in 1971 on four-horn sculpin Triglopsis quadricornis reproduction. A year later, he was promoted to the rank of docent. While studying the four-horn sculpin, he also ventured to look at the systematics of the other sculpin species of the Baltic drainage using the novel approach of biochemical systematics, and indeed managed to distinguish hybrids between two of the freshwater species. He was also able to show the diagnostic value of biochemical systematics within small crustacean groups like Gammarus and Mysidae.Lasse's doctoral work was part of a larger, systems study of the Baltic Sea, spearheaded by Lars Sile´n and Bengt-Owe Jansson. As part of a group of young, enthusiastic researchers thirsting to understand how this large brackish sea functioned as an ecosystem, Lasse helped to found the Asko¨Laboratory, Stockholm University's research station on the Baltic. He managed the station
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