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E. O. Wilson (1929–2021)

Wilson was an entomologist, biogeographer, and evolutionary biologist whose career moved through three distinct phases, each producing major work. The first was myrmecology — the study of ants — where he became the world authority and produced foundational work on chemical communication, caste systems, and social organisation. The second was island biogeography (with Robert MacArthur), which gave ecology a predictive mathematical framework. The third was sociobiology — the systematic study of the biological basis of social behaviour — which extended evolutionary analysis to human societies and provoked one of the most intense scientific controversies of the twentieth century. A late-career turn to group selection, explicitly abandoning the inclusive fitness framework he had helped popularise, reopened a debate many had considered settled.

Life

Born 10 June 1929 in Birmingham, Alabama. Childhood fascination with insects; lost sight in one eye at age seven in a fishing accident, which he later credited with directing his attention to small organisms. BS and MS in biology from the University of Alabama (1949, 1950). PhD in entomology from Harvard (1955). Joined the Harvard faculty and remained for his entire career — University Research Professor, then Pellegrino University Professor, then emeritus. Curator of entomology at the Museum of Comparative Zoology.

Awards include the National Medal of Science (1976), two Pulitzer Prizes for General Nonfiction (On Human Nature, 1979; The Ants with Bert Hölldobler, 1991), the Crafoord Prize (1990), and the TED Prize (2007). Founded the E. O. Wilson Biodiversity Foundation. Died 26 December 2021, aged ninety-two.

The ants

Wilson’s earliest and most sustained research programme. His work on ant taxonomy, biogeography, and social behaviour produced foundational contributions across several decades.

Chemical communication. Wilson demonstrated that ants communicate primarily through pheromones — chemical signals that coordinate colony behaviour, mark trails, trigger alarm responses, and regulate caste differentiation. The work, from the late 1950s onward, established chemical ecology as a field within entomology.

Caste and division of labour. Wilson’s studies of caste systems in ants — how colonies produce workers, soldiers, and reproductives in proportions that vary with environmental conditions — contributed to understanding how complex social organisation arises without central control.

The Ants (1990, with Bert Hölldobler) — the comprehensive treatment, 732 pages, covering taxonomy, anatomy, chemical ecology, colony organisation, and evolutionary biology. Winner of the Pulitzer Prize.

Island biogeography

The Theory of Island Biogeography (1967, with Robert MacArthur). The theory proposes that the number of species on an island represents a dynamic equilibrium between immigration and extinction, predictable from island area and distance from the mainland. It gave ecology a mathematical framework with testable predictions and later became foundational to conservation biology. The MacArthur person page carries the fuller treatment of the theory, its experimental tests, and its reception.

Sociobiology

Sociobiology: The New Synthesis (1975). The book drew together Hamilton’s inclusive fitness, Trivers’ reciprocal altruism, and the gene-centric perspective into a systematic account of social behaviour across the animal kingdom — from colonial invertebrates through social insects to vertebrate societies. Twenty-six of twenty-seven chapters cover non-human animals and were received as a major synthesis.

The final chapter extended the framework to human societies — proposing that aggression, sex roles, religion, and other social patterns have evolutionary origins amenable to biological analysis. Wilson framed the extension as a research programme, not a set of conclusions: the claim was that human social behaviour, like that of other animals, has been shaped by natural selection and can be studied as such.

The response was immediate and polarising. Lewontin, Gould, and other members of the Sociobiology Study Group at Harvard published a public critique in The New York Review of Books (1975), arguing that the extension to humans amounted to genetic determinism with political implications — echoes of Social Darwinism and biological justifications for inequality. Wilson rejected the determinism characterisation, framing the programme as a research project on the evolutionary origins of behaviour rather than a political claim about its inevitability. The debate over whether the critique’s framing was fair has continued since. The substance of the controversy — how far evolutionary analysis of behaviour can be extended to humans, and what the political stakes are — runs through evolutionary psychology and remains contested.

The group selection turn

In his late career, Wilson reversed his position on the units of selection. The Social Conquest of Earth (2012) and a 2010 Nature paper (with Martin Nowak and Corina Tarnita) argued that inclusive fitness theory is mathematically flawed and that group selection — selection acting on groups of organisms, favouring groups whose members cooperate — is the correct framework for understanding the evolution of eusociality and human social behaviour.

The reversal provoked sharp criticism from the inclusive fitness community. A response letter in Nature signed by 137 evolutionary biologists defended inclusive fitness theory and challenged the Nowak-Tarnita-Wilson paper’s mathematical claims. The debate is ongoing; Wilson’s late-career position remains a minority view within evolutionary biology, though the broader question of whether selection operates at multiple levels continues to be productive.

Biodiversity and conservation

From the 1980s onward, Wilson became the most prominent scientific advocate for biodiversity conservation. Biophilia (1984) proposed that humans have an innate affinity for other living organisms. The Diversity of Life (1992) laid out the biodiversity crisis for a general audience. The Half-Earth proposal (2016) argued that half of Earth’s surface should be set aside as protected habitat to prevent mass extinction.

Wilson coined the term “biodiversity” (in its shortened form; the full “biological diversity” predates him) and was instrumental in placing the concept at the centre of conservation policy. His advocacy was grounded in his scientific work — island biogeography provided the theoretical framework for understanding how habitat loss drives extinction.

Where Wilson stops

Wilson’s programme is biological and synthetic — it seeks to bring behaviour, ecology, and social organisation under the umbrella of evolutionary biology. The extension to human societies assumes that the same evolutionary logic that explains ant colonies and bird flocks applies, in principle, to human cultures. What the programme does not address is the degree to which human cultural transmission — language, institutions, symbolic systems — constitutes a domain with its own dynamics, not reducible to biological evolution even if it originated in it. The boundary between biological explanation and cultural explanation is where the sociobiology debate has always sat, and Wilson’s programme stays on the biological side of it.

Key works

See also: Darwinism · Trivers · Lewontin · Gould · Dawkins · Mutualism