Lauritz Sømme

Sømme joined the Norwegian Entomological Society in 1955, and he served on its board for several terms. In 2006, the board of the Norwegian Entomological Society unanimously recommended that Sømme be appointed an honorary member of the association, which took place at the society's annual meeting on February 13, 2007. He received honorary membership not for his professional career as an entomologist, but for his efforts on behalf of the society with the Norwegian Journal of Entomology, for which he served as editor from 1966 to 1978, and again from 1999 to 2007. Not least of all, he also wrote a history of Norwegian entomology and published it in a 326-page book when the Norwegian Entomological Society celebrated its centenary in 2004.

Sømme taught entomology at University of Oslo, from introductory courses upwards. Part of his teaching took place at the field station at Finse and in Ny-Ålesund. Sømme retired in 1998. He is a member of the Norwegian Academy of Science and Letters.

Sømme received the Fram Committee Nansen Award in 1992 for his work in polar areas.

Lauritz Sømme has made shorter trips to several places in the world to study arthropods' cold tolerance, including the Atlas Mountains and Mount Kenya in Africa. He has also spent time on Svalbard since 1988, where he helped determine that some animals can become desiccated in the fall. When the cold weather comes, they have so little water in their bodies that they survive until the spring without frost damage, and then in the spring the body's fluid content increases again. This strategy is used by some potworms and the Arctic springtail Onychiurus arcticus.

Since 1977, Sømme has participated in several research expeditions to the Antarctic, where he studied arthropods (mites and springtails) on Bouvet Island and in Queen Maud Land. The fauna there have the same survival mechanisms as Sømme had found earlier in Norway's high mountains at Finse. On Bouvet Island, there are eight to ten species of mites and springtails. The island lies 2,000 kilometers (1,200 mi) from the nearest continent. It lies east of the South Shetland Islands, and the wind in the area is often from the west. It is therefore natural to assume that both the flora and fauna on the island were brought by birds crossing the sea.

In 1970, Sømme changed his workplace from the Plant Protection Office to the University of Oslo, where he became a lecturer in entomology. Later, in 1985, he was appointed a professor of the subject. He continued his studies on the cold tolerance of beetles, springtails, and mites. Especially useful for him was the recently established research station at Finse. Cold tolerance was studied in mites and springtails on windblown and snowless ridges in the high mountains. It was determined that the leaf beetle Chrysomela collaris has a supercooling point (minimum lethal temperature) at −40 °C (−40 °F) before the body fluid freezes and the animal dies. At Finse, it was also discovered that the ground beetle Pelophila borealis can be completely frozen in ice over an extended period. The beetle's supercooling point is just −5 °C (23 °F), but this is probably enough because it winters under snow, which insulates it. The places it overwinters are sometimes damp and wet, and the beetle may risk freezing completely in ice. It was observed that it can survive in an environment without fresh oxygen (anoxia).

Sømme was the editor of the Norwegian Journal of Entomology from 1966 to 1978 and he has published several books. He is an honorary member of the Norwegian Entomological Society. Since 2011, Sømme has been responsible for invertebrates in the Great Norwegian Encyclopedia.

In 1962, Sømme spent a year in Canada studying cold tolerance in insects at the Canada Agriculture Research Station in Lethbridge, Alberta. Sømme's 1967 dissertation was on cold tolerance in insects.

Sømme received his candidatus realium degree from the University of Oslo in 1958 with a thesis on insecticide resistance (DDT) in houseflies (Musca domestica). Sømme found that there were not many houseflies in Norwegian barns. However, there were many other species of flies, such as cluster flies (Pollenia sp.) and blood-sucking parasitic stable flies (Stomoxys calcitrans), a biting fly related to the tsetse fly. Both of these and the houseflies were resistant to DDT.

His bibliography of research publications includes 143 articles published between 1958 and May 2007. He has written 94 popular science articles. Sømme has also authored many short articles and reports.

Lauritz Sverdrup Sømme (born March 7, 1931) is a Norwegian entomologist. His work has focused on insects in houses and stored foods, and especially the wintering and cold tolerance of certain arthropods. Sømme has been on several expeditions to the Antarctic, participated in field trips to Svalbard, and visited various other extreme places on Earth in his research on arthropods and cold tolerance.