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Dr Annie Duncan (born 28 November 1926), was a British Zoologist

Early life and education
Nan Duncan was born in London and spent the early part of her life in Russia where her father worked. She obtained her BSc in Zoology at University College, Leicester in 1948 and afterwards went to the Isle of Man to study marine worms. She then completed her PhD at the University of Liverpool, before joining the newly opened Zoology Department of Royal Holloway College as an assistant lecturer in 1952.

Career
She was promoted to Lecturer in 1957 and she started a BSc Ecology degree programme at Royal Holloway at a time when only three first degrees in this subject were offered within the UK. Duncan was Reader in Ecology from 1976 to her retirement in 1991. Her research focused on freshwater and marine ecology. Her data has been used to refine models of how reservoir ecosystems work, and her use of echo-sounding to measure fish populations is used by the Environment Agency.

Later life
After retirement she was Emeritus Reader in Ecology and Leader of the Hydroacoustic Unit at Royal Holloway Institute of Environmental Research, and continued to be active in research.

She died 3 October 2000.