petrelharp

@petrelharp@ecoevo.social

Mathematical evolutionary biologist and population geneticist at University of Oregon. He/him/his. Rearranges to spell my name.

This profile is from a federated server and may be incomplete. Browse more on the original instance.

ai6yr, to random
@ai6yr@m.ai6yr.org avatar

Seeing secondhand reports of aurora being visible in South Florida (Miami). Anyone out there able to confirm? #Aurora #FLwx #SpaceWeather

petrelharp,

@ai6yr here's one: https://mastodon.social/@LyndaDelph/112420297758336204

petrelharp, to random

New sex chromosome just dropped! Turns out that octopuses (and squid and cuttlefish!) are a "Z0" species. And, their Z chromosome is at least 380 million years old!
https://www.biorxiv.org/content/10.1101/2024.02.21.581452v1.full.pdf

petrelharp, to random

Our local paper is back! (Almost went under due to embezzling.)

petrelharp, to random

Hey, popgen/evolution-minded folks: we're hiring a postdoc! It's flexible: interested in doing computational things around space and adaptation? deep learning methods? ARG/tree sequence inference? empirical popgen using these? the stdpopsim project? Check out https://evol.mcmaster.ca/brian/evoldir/PostDocs//UOregon.PopulationGenomics

gvwilson, to random
@gvwilson@mastodon.social avatar

One of the most useful things I've ever found on the web comes from NOAA, and is about dealing with disruptive behaviors in meetings: https://coast.noaa.gov/ddb/ I've cached the PDF at https://drive.google.com/file/d/1DgQmgHWWdRXdHv28zR5_4B84qUTwus1d/view?usp=sharing if you want to post a framed copy on the wall in your office…

petrelharp,

@gvwilson That's a good one!

petrelharp, to random

Fall colors, Oregon Cascades:

petrelharp, to random

Behold the land of the Tiny Turtles! (I had some help at work today.)

A whiteboard with a tree, clouds, the tiny turtles and one big one, and various other animals, with two big rats looking down from the sky.
Close up of "(To help save the land of the Tiny Turtles you have to add to the drawing.)"

petrelharp, to random

Hey, scientists: how often do you calibrate your scales?

I've just had a terrifying experience analyzing some field data: turned out that one scale was weighing 2/3 what the others were. If it hadn't been so far off we never would have noticed, and the resulting batch effects would have produced some very misleading signal.

That left bump of z-scores? From the bad scale:

petrelharp,

@ojala That sounds very wise.

petrelharp,

@ojala omg SO MUCH SENSE

petrelharp, to random

Coastal Oregon old growth is magical.

petrelharp, to random

Postdoc job alert: want to do fun computational genomics and think about genealogical trees? In Oregon? Know someone who might? Get in touch!

(details to follow)

petrelharp,

Here's the whole ad, as a thread:

2-4 year postdoc position working with tree sequences at the University of Oregon.

We seek a postdoc for a collaborative, computational project to develop and apply cuttin edge computational methods in genomics; in particular working with the growing ecosystem of population genetics tools based on the “succinct tree sequence” data structure.

petrelharp, to random

It was great to see all the science and colleagues at ! Here's a thread of some tidbits:

petrelharp,

One of my favorite was Teresa Pegan, who looked at an impressive genomic dataset from museum specimens of 34 passerines across the N.Am boreal, and found... not much spatial structure, but LOTS of polymorphic inversions - 130 of them! A fair number are even polymorphic across species, including one across 11 warlbers! No known associated phenotypes, most aren't even very spatially structured. What are they doing (if anything)?

petrelharp,

Another museum-bird talk was Sara Ryding, who scanned a bunch from 78 species over ~100 years, and found that across (nearly?) all species, bills are getting longer; and wing lengths are changing different directions... maybe related to thermoregulation as termperatures climb? This is a nice addition to "bird morphology change", by now observed in lots of situations.

ojala, to random
@ojala@mastodon.nz avatar

deleted_by_author

    •
    petrelharp,

    @ojala If it's dense already,
    ut = (x != 0)
    ijx = data.frame(i=row(x)[ut], j=col(x)[ut], x=x[ut]) |> subset(i<=j)
    If it's in a sparse matrix format already, there's better ways.

    petrelharp, to random

    Y'all. NIST has trading cards.

    Back of the card, with text about The Mole, by NIST, the National Institute of Standards and Technology, see NIST.gov/kids

  • All
  • Subscribed
  • Moderated
  • Favorites
  • •
  • JUstTest
  • mdbf
  • InstantRegret
  • ethstaker
  • magazineikmin
  • GTA5RPClips
  • rosin
  • modclub
  • Youngstown
  • ngwrru68w68
  • slotface
  • osvaldo12
  • kavyap
  • DreamBathrooms
  • Leos
  • thenastyranch
  • everett
  • cubers
  • cisconetworking
  • normalnudes
  • Durango
  • anitta
  • khanakhh
  • tacticalgear
  • tester
  • provamag3
  • megavids
  • lostlight
  • All magazines
    •