Evidence map›Paper›PMID 33139540›Full record

ReviewProceedings of the National Academy of Sciences of the United States of America2020

The evolution of altruism and the serial rediscovery of the role of relatedness.

Tomas Kay, Laurent Keller, Laurent Lehmann

Open access · greenAbstract readReview
In one paragraph

Review in Proceedings of the National Academy of Sciences of the United States of America, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 35 papers.

0numbers the graph read from it
0cells of the map it votes in
35citing papers in PubMed
25.8field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

35 citing papers in PubMed, 107 citations in OpenAlex.

  1. Persuading large language models to comply with objectionable requests.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  2. Behavioural ecology in the twenty-first century.Nature ecology & evolution · 2025
    Review
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  5. Distinct oxytocin signaling pathways synergistically mediate rescue-like behavior in mice.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
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  7. Repeated games with partner choice.PLoS computational biology · 2025
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  16. Reproductive variance can drive behavioral dynamics.Proceedings of the National Academy of Sciences of the United States of America · 2023
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

3 authors at 1 institution in 1 country.

Tomas KayDepartment of Ecology and Evolution, University of Lausanne, 1015 Lausanne, Switzerland.ORCID 0000-0003-2453-2514
Laurent KellerDepartment of Ecology and Evolution, University of Lausanne, 1015 Lausanne, Switzerland Laurent.Keller@unil.ch.ORCID 0000-0002-5046-9953
Laurent LehmannDepartment of Ecology and Evolution, University of Lausanne, 1015 Lausanne, Switzerland.ORCID 0000-0001-9549-9577
University of Lausanne · CH

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The genetic evolution of altruism (i.e., a behavior resulting in a net reduction of the survival and/or reproduction of an actor to benefit a recipient) once perplexed biologists because it seemed paradoxical in a Darwinian world. More than half a century ago, W. D. Hamilton explained that when interacting individuals are genetically related, alleles for altruism can be favored by selection because they are carried by individuals more likely to interact with other individuals carrying the alleles for altruism than random individuals in the population ("kin selection"). In recent decades, a substantial number of supposedly alternative pathways to altruism have been published, leading to controversies surrounding explanations for the evolution of altruism. Here, we systematically review the 200 most impactful papers published on the evolution of altruism and identify 43 evolutionary models in which altruism evolves and where the authors attribute the evolution of altruism to a pathway other than kin selection and/or deny the role of relatedness. An analysis of these models reveals that in every case the life cycle assumptions entail local reproduction and local interactions, thereby leading to interacting individuals being genetically related. Thus, contrary to the authors' claims, Hamilton's relatedness drives the evolution to altruism in their models. The fact that several decades of investigating the evolution to altruism have resulted in the systematic and unwitting rediscovery of the same mechanism is testament to the fundamental importance of positive relatedness between actor and recipient for explaining the evolution of altruism.

Indexed as

AltruismBiological EvolutionCooperative BehaviorAnimalsHumansModels, GeneticSelection, GeneticaltruismevolutionHamilton’s rulekin selectionrediscovery

Identifiers

PMID33139540
PMCPMC7682561
OpenAlexW3096158595

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.