Renowned zoologist athol mclachlan dies at 86
Zoologist Athol McLachlan, known for his groundbreaking research on chironomid midges, has passed away at the age of 86.
A life devoted to the study of nature's smallest creatures
Throughout his career, McLachlan was fascinated by the intricate lives of these tiny, non-biting flies that spend most of their existence as aquatic larvae before briefly emerging as adults. His work took him from the rock pools of Malawi to the hedgerows of Britain, uncovering elegant insights into how natural selection adapts organisms to transient environments.
In the 1960s, during his doctoral research on Lake Kariba, McLachlan recognized chironomids as ideal models to test classic ideas in ecology and evolution. He became particularly intrigued by the shallow, short-lived rain pools that form on exposed rock and persist for weeks or months before drying out.
By transplanting midge species between these pools, McLachlan demonstrated that each pool contains the larvae of only one of several midge species, due to a small set of factors that allow one species to exclude all others. This rare experimental evidence provided clear confirmation of niche and competition theory.
In the 1980s, while studying chironomid species closer to his Newcastle home, McLachlan made another breakthrough. He found that, unlike in most animals where sexual selection favors large males, the smallest chironomid males achieved disproportionate success in mating swarms. This was because, his work showed, small size conferred an aerial advantage, allowing these males to respond more rapidly to incoming females.
Mclachlan's work in this area has since become incorporated into sexual selection theory, which suggests that where males compete in three-dimensional arenas, agility can be favored over size or strength.
Born in Johannesburg, South Africa, McLachlan developed an early fascination with the natural world. He went on to study zoology and botany at the University of the Witwatersrand, graduating in 1962 before beginning his doctoral research at Lake Kariba. After receiving his PhD from the University of London in 1968, he held various academic positions, eventually becoming a lecturer at the University of Newcastle-upon-Tyne, where he remained for the rest of his career.
A respected lecturer known for his emphasis on curiosity-driven research, McLachlan was also an accomplished field course leader. In his later years, he continued to publish research and maintain a science blog with his wife, ceramic artist Charlotte Mellis, whom he married in 1993 after meeting on the Isle of Mull, where they eventually settled.