George Jarvis
@gc-jarvis.bsky.social
📤 242
📥 810
📝 1
Postdoc at the University of Chicago interested in body size, energy, and life history
pinned post!
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
add a skeleton here at some point
6 months ago
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reposted by
George Jarvis
Dustin Marshall
5 days ago
Out today in
@cp-trendsecolevo.bsky.social
our paper “Second Thoughts about First Principles in Biology.”
www.cell.com/trends/ecolo...
. We are in favour of first principles approaches in biology but we think that we need to do better in how we use them.
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Second thoughts about first principles in biology
First-principles approaches, based on physics or chemistry, are key pillars of biological theory. Despite their value, there are recurrent problems with many first-principles approaches in biology: th...
https://www.cell.com/trends/ecology-evolution/fulltext/S0169-5347(26)00083-2
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reposted by
George Jarvis
Dustin Marshall
21 days ago
Metabolic scaling is thought to scale very steeply with size in unicells but what if that steepness is simply an artefact? Out today in Ecology Letters, we show that metabolic scaling is not superlinear in unicells but instead scales at ~0.86
onlinelibrary.wiley.com/doi/epdf/10....
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Drivers and Consequences of Size Declines in Unicells
Reader environment loaded
https://onlinelibrary.wiley.com/doi/epdf/10.1111/ele.70387
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reposted by
George Jarvis
Dustin Marshall
3 months ago
Out today in
@science.org
our paper on how evolutionary adaptation to warming will reduce fisheries yields. Please let me know if you need me to send you a copy. Summary of the paper coming soon.
www.science.org/doi/10.1126/...
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Evolutionary adaptation to global change reduces sustainable fisheries yields
Global warming is altering the fisheries that underpin food security, but projections of these impacts generally exclude evolutionary processes. We describe a model that forecasts how fish will adapt ...
https://www.science.org/doi/10.1126/science.aea1341
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reposted by
George Jarvis
Dustin Marshall
2 months ago
Fish will have to adapt to a warming world, what will that adaptation do to fisheries yields? We answer that question today in Science. I’ll summarise our findings very briefly in this thread
www.science.org/doi/epdf/10....
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Evolutionary adaptation to global change reduces sustainable fisheries yields
Global warming is altering the fisheries that underpin food security, but projections of these impacts generally exclude evolutionary processes. We describe a model that forecasts how fish will adapt ...
https://www.science.org/doi/epdf/10.1126/science.aea1341
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reposted by
George Jarvis
School of Biological Sciences, Monash @MonashBiol
5 months ago
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...
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reposted by
George Jarvis
School of Biological Sciences, Monash @MonashBiol
5 months ago
Was Darwin wrong? Hermaphrodites found to be more energy efficient than animals with two sexes
monash.edu/science/news...
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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.
https://monash.edu/science/news-events/news/2025/was-darwin-wrong-hermaphrodites-found-to-be-more-energy-efficient-than-animals-with-two-sexes
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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
add a skeleton here at some point
6 months ago
0
12
5
reposted by
George Jarvis
Dustin Marshall
6 months ago
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...
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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
https://royalsocietypublishing.org/rspb/article/292/2060/20252276/363968/Hermaphrodites-have-lower-metabolic-rates-than
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reposted by
George Jarvis
The American Genetic Association
about 1 year ago
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.
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reposted by
George Jarvis
Will White
over 1 year ago
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...
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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
https://jobs.virginia.edu/us/en/job/R0068841/Research-Associate-in-Environmental-Sciences
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reposted by
George Jarvis
Dustin Marshall
over 1 year ago
We are extending the deadline past the 10th so everyone please repost. ECRs, there are still some places left so please apply!
add a skeleton here at some point
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