Evidence map›Paper›PMID 39007109›Full record

ArticleAnimal behaviour2024

Age-related reproductive effort in male chimpanzees: terminal investment or alternative tactics?

Martin N Muller, Kris H Sabbi, Melissa Emery Thompson, Drew K Enigk, Lindsey Hagberg, Zarin P Machanda, Ashley Menante, Emily Otali, Richard W Wrangham

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Animal behaviour, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.

0numbers the graph read from it
0cells of the map it votes in
3citing 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

3 citing papers in PubMed.

  1. Article
  2. Strategies, costs and counter-strategies to sexual coercion.Biological reviews of the Cambridge Philosophical Society · 2025
    Review
  3. 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

9 authors.

Martin N MullerDepartment of Anthropology, University of New Mexico, Albuquerque, NM, U.S.A.
Kris H SabbiDepartment of Human Evolutionary Biology, Harvard University, Cambridge, MA, U.S.A.
Melissa Emery ThompsonDepartment of Anthropology, University of New Mexico, Albuquerque, NM, U.S.A.
Drew K EnigkDepartment of Anthropology, University of New Mexico, Albuquerque, NM, U.S.A.
Lindsey HagbergDepartment of Human Evolutionary Biology, Harvard University, Cambridge, MA, U.S.A.
Zarin P MachandaDepartment of Anthropology, Tufts University, Medford, MA, U.S.A.
Ashley MenanteDepartment of Anthropology, Tufts University, Medford, MA, U.S.A.
Emily OtaliKibale Chimpanzee Project, Makerere University Biological Field Station, Fort Portal, Uganda.
Richard W WranghamDepartment of Human Evolutionary Biology, Harvard University, Cambridge, MA, U.S.A.

Funding

Molecular Epidemiology and Natural History of SIVcpzR01AI058715 · NIAID · UNIVERSITY OF PENNSYLVANIA · PI HAHN, BEATRICE H · 2004 to 2013
$6.1M
Cumulative Life Course Effects on Aging and Health in a Long-Lived Primate ModelR37AG049395 · NIA · UNIVERSITY OF NEW MEXICO · PI Elizabeth Vinson Lonsdorf, Melissa Emery Thompson · 2022 to 2026
$3.2M
Biodemography of Aging in Wild ChimpanzeesR01AG049395 · NIA · UNIVERSITY OF NEW MEXICO · PI MITANI, JOHN CARY, ROSATI, ALEXANDRA G · 2015 to 2019
$2.9M
Novel frameworks for explaining unequal access to the health benefits of social ties: a longitudinal analysis in wild chimpanzeesR61AG078468 · NIA · UNIVERSITY OF NEW MEXICO · PI MACHANDA, ZARIN, THOMPSON, MELISSA EMERY · 2022 to 2023
$611k
NIAID NIH HHS R01 AI058715NIA NIH HHS R01 AG049395NIA NIH HHS R37 AG049395NIA NIH HHS R61 AG078468
6 · The paper itself

Abstract

Because senescence impairs the ability of older males to compete successfully for mates, male reproductive strategies are expected to change with age. The terminal investment hypothesis proposes that older males, who could die soon, should take greater risks to obtain mating opportunities. Another possibility is that older males avoid such risks, adopting alternative reproductive tactics, such as increased affiliation with females, increased reliance on coalitions or sexual coercion to continue to compete with younger animals. We tested these hypotheses in wild chimpanzees,

Indexed as

affiliationaggressionalternative reproductive tacticcoalitionmating effortsenescencesexual coercion

Identifiers

PMID39007109
PMCPMC11238624

What OpenQuestion holds

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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.