Jens Clausen

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Jens Christen (Christian) Clausen
Born(1891-03-11)March 11, 1891
Carnegie Institution
Academic advisorsØjvind Winge

Jens Christen (Christian) Clausen (March 11, 1891 – November 22, 1969) was a Danish-American botanist, geneticist, and ecologist. He is considered a pioneer in the field of ecological and evolutionary genetics of plants.[1]

Viola tricolor
.

Biography

Clausen was born in

Mendel's genetics and Darwinian evolutionary theory. In 1913 he entered the University of Copenhagen, where he studied botany, genetics and ecology. Christen Raunkiær suggested he undertake graduate studies and Clausen chose to study the genetics and ecology of the plant family Violaceae. He studied hybridization patterns across a range of environments and described introgression of genes between species. He completed his master's degree in 1920 and was appointed assistant professor to geneticist Øjvind Winge at the Royal Veterinary and Agricultural University
in Copenhagen. [2]

In 1926, Clausen was awarded his

Sierra Nevada (at about 10,000 feet).[3]

Works

Collectively Clausen, Keck and Hiesey wrote five books on their work, including Experimental Studies on the Nature of Species. I. Effect of Varied Environments on Western North American Plants published in 1940 and Experimental Studies on the Nature of Species. III. Environmental Responses of Climatic Races of Achillea in 1948. Clausen produced one additional book about his work based on the Messenger Lectures he gave at Cornell which was published in 1951 as Stages in the Evolution of Plant Species.

Honors

Clausen was elected a member of the

Order of the Danneborg by Frederik IX of Denmark. Clausen was a member of the First Baptist Church of Palo Alto, California
. [4]

Family

Clausen was married to Anna Hansen.[5] Anna supported and assisted with Clausen's scientific career by undertaking "artificial pollinations, back-crossings, fixations, baggings and harvesting" of plants, as well as assisting with the recording and numbering of segregated types, thus providing material and data upon which some of his scientific writings were based.[6]

References

  1. ^ C. Stacy French (1989) Biographical Memoirs (National Academy of Sciences, Volume 58, pages 75-89)
  2. ^ "Jens Christian Clausen". Den Store Danske. Retrieved December 20, 2015.
  3. ^ C. Stacy French (1989). "Jens Christian Clausen" (PDF). National Academy of Sciences. Retrieved December 20, 2015.
  4. ^ Charles H. Smith. "Clausen, Jens Christen (Denmark-United States 1891-1969)". Some Biogeographers, Evolutionists and Ecologists: Chrono-Biographical Sketches. Retrieved December 20, 2015.
  5. ^ "Anna Clausen". geni_family_tree. Retrieved 2022-11-28.
  6. Wikidata Q115477548
    .

Other sources

  • Smocovitis, V. B. (2000) Clausen, Jens Christen in "American National Biography Online" (Oxford University Press)

External links
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