Evidence map›Paper›PMID 34074124›Full record

ArticleProceedings. Biological sciences2021

The Goldilocks effect: female geladas in mid-sized groups have higher fitness.

Elizabeth Tinsley Johnson, Jacob A Feder, Thore J Bergman, Amy Lu, Noah Snyder-Mackler, Jacinta C Beehner

Abstract read
In one paragraph

Article in Proceedings. Biological sciences, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.

0numbers the graph read from it
0cells of the map it votes in
9citing 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

9 citing papers in PubMed.

  1. Article
  2. Group traits moderate the relationship between individual social traits and fitness in gorillas.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  3. Article
  4. Article
  5. Article
  6. Article
  7. Article
  8. Article
  9. Social drivers of maturation age in female geladas.Behavioral ecology : official journal of the International Society for Behavioral Ecology
    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

6 authors.

Elizabeth Tinsley JohnsonDepartment of Integrative Biology, Michigan State University, East Lansing, MI 48824, USA.
Jacob A FederInterdepartmental Program in Anthropological Sciences, Stony Brook University, Stony Brook, NY 11794-4364, USA.
Thore J BergmanDepartment of Psychology, University of Michigan, Ann Arbor, MI 48109-1043, USA.
Amy LuInterdepartmental Program in Anthropological Sciences, Stony Brook University, Stony Brook, NY 11794-4364, USA.
Noah Snyder-MacklerSchool of Life Sciences, Arizona State University, Tempe, AZ 85287-4701, USA.
Jacinta C BeehnerDepartment of Psychology, University of Michigan, Ann Arbor, MI 48109-1043, USA.

Funding

Gene regulatory analysis of social integration and resilience during agingR00AG051764 · NIA · UNIVERSITY OF WASHINGTON · PI SNYDER-MACKLER, NOAH · 2017 to 2019
$746k
NIA NIH HHS R00 AG051764
6 · The paper itself

Abstract

The cost-benefit ratio of group living is thought to vary with group size: individuals in 'optimally sized' groups should have higher fitness than individuals in groups that are either too large or too small. However, the relationship between group size and individual fitness has been difficult to establish for long-lived species where the number of groups studied is typically quite low. Here, we present evidence for optimal group size that maximizes female fitness in a population of geladas (

Indexed as

TheropithecusAnimalsFemaleHumansMalePredatory BehaviorReproductionfitnessfolivore paradoxinfanticideoptimal group sizereproductionsurvival

Identifiers

PMID34074124
PMCPMC8170190

What OpenQuestion holds

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LicenceCC BY
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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.