George Jarvis
@gc-jarvis.bsky.social
Postdoc at the University of Chicago interested in body size, energy, and life history
Pinned
George Jarvis
@gc-jarvis.bsky.social
· Dec 12
Darwin speculated that it was energetically costly to be an hermaphrodite. He thought that might explain why they were relatively rare in animals. Our paper out today tested this conjecture for the first time.
royalsocietypublishing.org/rspb/article...
royalsocietypublishing.org/rspb/article...
Hermaphrodites have lower metabolic rates than gonochores
Abstract. Hermaphroditism, where an individual can reproduce as both male and female, offers some clear reproductive advantages. Simultaneous hermaphroditi
royalsocietypublishing.org
Excited to share our study testing competing theories on the energy dynamics of hermaphroditism! Grateful to @djmmeeg.bsky.social for guidance, to Thomas Brey for metabolic rate data, and to Deborah Charlesworth for feedback. Thanks also to the editors and reviewers at Proc B. @royalsociety.org
Reposted by George Jarvis
Is hermaphrodism less common in animals because it is energetically more costly? George Jarvis and @djmmeeg.bsky.social have analysed 536 species of marine invertebrates and found that hermaphrodites require approximately 27% less energy than gonochores on average.
doi.org/10.1098/rspb...
doi.org/10.1098/rspb...
December 22, 2025 at 5:12 AM
Is hermaphrodism less common in animals because it is energetically more costly? George Jarvis and @djmmeeg.bsky.social have analysed 536 species of marine invertebrates and found that hermaphrodites require approximately 27% less energy than gonochores on average.
doi.org/10.1098/rspb...
doi.org/10.1098/rspb...
Reposted by George Jarvis
Was Darwin wrong? Hermaphrodites found to be more energy efficient than animals with two sexes
monash.edu/science/news...
monash.edu/science/news...
Was Darwin wrong? Hermaphrodites found to be more energy efficient than animals with two sexes
Hermaphrodites may have an unexpected evolutionary advantage over animals with separate sexes, they use significantly less energy to live.
monash.edu
December 22, 2025 at 5:30 AM
Was Darwin wrong? Hermaphrodites found to be more energy efficient than animals with two sexes
monash.edu/science/news...
monash.edu/science/news...
Excited to share our study testing competing theories on the energy dynamics of hermaphroditism! Grateful to @djmmeeg.bsky.social for guidance, to Thomas Brey for metabolic rate data, and to Deborah Charlesworth for feedback. Thanks also to the editors and reviewers at Proc B. @royalsociety.org
Darwin speculated that it was energetically costly to be an hermaphrodite. He thought that might explain why they were relatively rare in animals. Our paper out today tested this conjecture for the first time.
royalsocietypublishing.org/rspb/article...
royalsocietypublishing.org/rspb/article...
Hermaphrodites have lower metabolic rates than gonochores
Abstract. Hermaphroditism, where an individual can reproduce as both male and female, offers some clear reproductive advantages. Simultaneous hermaphroditi
royalsocietypublishing.org
December 12, 2025 at 4:41 PM
Excited to share our study testing competing theories on the energy dynamics of hermaphroditism! Grateful to @djmmeeg.bsky.social for guidance, to Thomas Brey for metabolic rate data, and to Deborah Charlesworth for feedback. Thanks also to the editors and reviewers at Proc B. @royalsociety.org
Reposted by George Jarvis
Darwin speculated that it was energetically costly to be an hermaphrodite. He thought that might explain why they were relatively rare in animals. Our paper out today tested this conjecture for the first time.
royalsocietypublishing.org/rspb/article...
royalsocietypublishing.org/rspb/article...
Hermaphrodites have lower metabolic rates than gonochores
Abstract. Hermaphroditism, where an individual can reproduce as both male and female, offers some clear reproductive advantages. Simultaneous hermaphroditi
royalsocietypublishing.org
December 11, 2025 at 1:13 AM
Darwin speculated that it was energetically costly to be an hermaphrodite. He thought that might explain why they were relatively rare in animals. Our paper out today tested this conjecture for the first time.
royalsocietypublishing.org/rspb/article...
royalsocietypublishing.org/rspb/article...
Reposted by George Jarvis
Another cool genome assembly: The first phased, annotated, chromosome-level assembly for a reef-building tubeworm, Galeolaria caespitosa! The species has 11 autosomal chromosomes and no sex chromosomes.
April 28, 2025 at 6:00 PM
Another cool genome assembly: The first phased, annotated, chromosome-level assembly for a reef-building tubeworm, Galeolaria caespitosa! The species has 11 autosomal chromosomes and no sex chromosomes.
Reposted by George Jarvis
Hiring a postdoc! For #NSF project on oyster metapopulations and restoration, led by Max Castorani at UVa. Two year position based at UVa, OSU, or remote. Ideal for PhDs in quant ecology or oceanography. Apply by March 1. Message me with questions! jobs.virginia.edu/us/en/job/R0...
Research Associate in Environmental Sciences in Charlottesville, Virginia, United States of America | Research at University of Virginia
Apply for Research Associate in Environmental Sciences job with University of Virginia in Charlottesville, Virginia, United States of America. Research at University of Virginia
jobs.virginia.edu
January 18, 2025 at 9:52 PM
Hiring a postdoc! For #NSF project on oyster metapopulations and restoration, led by Max Castorani at UVa. Two year position based at UVa, OSU, or remote. Ideal for PhDs in quant ecology or oceanography. Apply by March 1. Message me with questions! jobs.virginia.edu/us/en/job/R0...
Reposted by George Jarvis
We are extending the deadline past the 10th so everyone please repost. ECRs, there are still some places left so please apply!
🧪 Deadline is 10 January 2025 to apply for a funded early-career researcher place at our Workshop 'Why Are Cells the Size They Are?' organised by
Dustin Marshall
@djmmeeg.bsky.social
and Craig White. Find out more and apply at
bit.ly/4gVDROh
#BiologistsWorkshops
#ECR
Dustin Marshall
@djmmeeg.bsky.social
and Craig White. Find out more and apply at
bit.ly/4gVDROh
#BiologistsWorkshops
#ECR
January 9, 2025 at 10:13 PM
We are extending the deadline past the 10th so everyone please repost. ECRs, there are still some places left so please apply!