Evidence map›Paper›PMID 40740791›Full record

ArticleEcology and evolution2025

Unusual Sperm Morphology in Two Sedentary Songbird Species.

Emily R A Cramer, Gaute Grønstøl, Phred M Benham, Carla Cicero, Rauri C K Bowie, Daniel J Tobiansky, Jan T Lifjeld

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Ecology and evolution, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing 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

1 citing paper in PubMed.

  1. 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

7 authors.

Emily R A CramerNatural History Museum University of Oslo Oslo Norway.ORCID https://orcid.org/0000-0002-1443-9255
Gaute GrønstølNatural History Museum University of Oslo Oslo Norway.
Phred M BenhamMuseum of Vertebrate Zoology University of California Berkeley Berkeley California USA.
Carla CiceroMuseum of Vertebrate Zoology University of California Berkeley Berkeley California USA.ORCID https://orcid.org/0000-0002-6282-2339
Rauri C K BowieMuseum of Vertebrate Zoology University of California Berkeley Berkeley California USA.ORCID https://orcid.org/0000-0001-8328-6021
Daniel J TobianskyDepartment of Biology St. Mary's College of Maryland St. Mary's City Maryland USA.
Jan T LifjeldNatural History Museum University of Oslo Oslo Norway.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Sperm morphology can differ dramatically among closely related species. Within songbirds, the typical filiform sperm has a slender, corkscrew-shaped head and an elongated midpiece coiled around the flagellum. However, three songbird species are known to have an unusual tadpole-like sperm morphology with a round or ellipsoid head and short, uncoiled midpiece, which may arise developmentally via neoteny. Here, we describe tadpole-like sperm phenotypes from two additional songbird species, the white-breasted nuthatch (

Indexed as

cryptic female choiceevolutionary jumpsfemale promiscuitypost‐copulatory sexual selectionsperm competitionweak selection

Identifiers

PMID40740791
PMCPMC12310291

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.