Evidence map›Paper›PMID 34238930›Full record

ArticleNature communications2021

Different environmental variables predict body and brain size evolution in Homo.

Manuel Will, Mario Krapp, Jay T Stock, Andrea Manica

Abstract read
In one paragraph

Article in Nature communications, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed
–field-weighted citation impact
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

16 citing papers in PubMed.

  1. Competing models of hominin body size evolution.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  2. Article
  3. Pan-African model explainsbioRxiv : the preprint server for biology · 2026
    Article
  4. Article
  5. Article
  6. Why did the human brain size evolve? A way forward.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Article
  7. Article
  8. Hominin brain size increase has emerged from within-species encephalization.Proceedings of the National Academy of Sciences of the United States of America · 2024
    Article
  9. Article
  10. Article
  11. The wooden artifacts from Schöningen's Spear Horizon and their place in human evolution.Proceedings of the National Academy of Sciences of the United States of America · 2024
    Article
  12. Article
  13. Article
  14. Article
  15. Article
  16. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors.

Manuel Will *Department of Early Prehistory and Quaternary Ecology, University of Tübingen, Tübingen, Germany. manuel.will@uni-tuebingen.de.ORCID 0000-0001-8116-2543
Mario Krapp *Evolutionary Ecology Group, Department of Zoology, University of Cambridge, Cambridge, UK.ORCID 0000-0002-2599-0683
Jay T StockDepartment of Anthropology, Western University, London, ON, Canada.ORCID 0000-0003-0147-8631
Andrea ManicaEvolutionary Ecology Group, Department of Zoology, University of Cambridge, Cambridge, UK.ORCID 0000-0003-1895-450X

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Increasing body and brain size constitutes a key macro-evolutionary pattern in the hominin lineage, yet the mechanisms behind these changes remain debated. Hypothesized drivers include environmental, demographic, social, dietary, and technological factors. Here we test the influence of environmental factors on the evolution of body and brain size in the genus Homo over the last one million years using a large fossil dataset combined with global paleoclimatic reconstructions and formalized hypotheses tested in a quantitative statistical framework. We identify temperature as a major predictor of body size variation within Homo, in accordance with Bergmann's rule. In contrast, net primary productivity of environments and long-term variability in precipitation correlate with brain size but explain low amounts of the observed variation. These associations are likely due to an indirect environmental influence on cognitive abilities and extinction probabilities. Most environmental factors that we test do not correspond with body and brain size evolution, pointing towards complex scenarios which underlie the evolution of key biological characteristics in later Homo.

Indexed as

Biological EvolutionAnimalsBody SizeBrainClimateFossilsHominidaeModels, BiologicalOrgan SizePhylogenyTemperature

Identifiers

PMID34238930
PMCPMC8266824

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Registered trials

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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.