Markus Friedrich

Markus Friedrich

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Published on Oct 10, 2019

First 18 degrees Celsius cave beetle offspring!

First 18 degrees Celsius cave beetle offspring!Hello there everyone, And my apology for the flimsy smart phone cave beetle microscope shot. But you are looking at one of two adults that I found on ...

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Published on Oct 01, 2019

33 16 degrees Celsius cave beetles later

It's officially October now, and I haven't seen any new beetles emerging from the 16 degrees culture place since September 17th. Moreover, the last larvae were transferred into this plate on July 1...

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Published on Jul 27, 2019

Delighted to announce the first 16 degree Celsius cave beetle lab offspring

First seen on Tuesday July the 23rd to be exact. But the clip below was taken 2 days later on Thursday. It shows one (still camera shy) of at least 3 adults on the plate that was populated with the...

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Published on Jun 16, 2019

Cave beetle larva movie

To make the possible waiting period a bit more entertaining, one of the larvae decided to give us a glimpse of its roaming behavior. This is a 1st instar larva of about 2.5 mm length captured last ...

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Published on Jun 16, 2019

P. hirtus 1st larval instar exuvia annotated

Here it is:In case exuvia did not yet make it into your dictionary yet: As Qing pointed out correctly, you are looking at the former chitin based skin of the first instar larvae left behind after s...

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Published on Jun 08, 2019

Cave beetle larvae invite for a new challenge question

Hello there friends of the cave beetle!This may be pushing the limits of minimally shareworthy data bite but it sure is something you will never see in an actual publication. And it's been making m...

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Published on Jun 02, 2019

First sight of 16 degrees Celsius cave beetle larvae

It's been great to encounter the first 2 P. hirtus larvae on the yeast food patch just last Friday last day of May, i.e. what as the 31st. As I a was setting up the cultures following my last post,...

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Published on May 05, 2019

P. hirtus’ upper temperature tolerance limit revealed: 26 degrees Celsius

P. hirtus’ upper temperature tolerance limit revealed: 26 degrees CelsiusFirst off: My compliments on your patience with the seemingly endless duration of this cliffhanger. Turns out we can blame t...

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Published on Mar 24, 2019

2019 Cave beetle talk at Western Michigan University Kalamazoo

Hello there friends of the cave beetle! Very pleased to inform you about a "first second": The first time the cave beetle was invited back to the same institution, the fantastic Department of Biolo...

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Update: 4 more swiftly moving 18 degress Celsius beetles collected this week. So it seems safe to conclude that this temperature is not a challenge for P. hirtus.
Oct 17, 2019
Exploring the temperature tolerance of a cave beetle
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Glueckwunsch! Thanks for a great study. And for proving what this site can facilitate.
Oct 01, 2019
Finding the ancestral roots of female orgasm
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You are right on the money again. Sensory appendage elongation is part of what is called the troglomorphic phenotype. The most striking aspect in the P. hirtus larvae are the long terminal cerci. Will post an annotated image this weekend (if time allows).
Jun 11, 2019
Exploring the temperature tolerance of a cave beetle
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That is right indeed. Congratulations Qing and thank you for your insightful input! Turns out we are looking at a shed first larval instar cuticle or exoskeleton. This documents successful growth and development of the larvae on the 16 degrees Celsius plate. It's easy to grow in body size, but quite a challenge for any molting animal (Edysozoa) to break through the tightening grip of an outsized cuticle and leave it completely behind. So that's why this little piece of larval cuticle is a really encouraging finding.
Jun 11, 2019
Exploring the temperature tolerance of a cave beetle
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Hi there Qing, Interesting guess. What exactly do you mean by "molt"?
Jun 10, 2019
Exploring the temperature tolerance of a cave beetle
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Your kind words are much appreciated, Monique. The cave beetle friends will stay informed here. Promise!
May 21, 2019
Exploring the temperature tolerance of a cave beetle
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Hello there Tom, and many thanks for drawing attention to Hadenoecus subterraneus (https://en.wikipedia.org/wiki/Hadenoecus), the cave beetle's food supplier. Indeed, I fully agree with that our data imply Hadenoecus subterraneus's well being as the more immediately pressing issue when it comes to the potential effects of global warming on P. hirtus.
May 07, 2019
Exploring the temperature tolerance of a cave beetle
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Hello there Tom, and many thanks for drawing the attention to Hadenoecus subterraneus (https://en.wikipedia.org/wiki/Hadenoecus), the cave beetle's food supplier. Indeed, I fully agree with that our data imply Hadenoecus subterraneus's well being as the more immediately pressing issue when it comes to the potential effects of global warming on P. hirtus.
May 07, 2019
Exploring the temperature tolerance of a cave beetle
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Hello there Tom, and many thanks for drawing the attention to Hadenoecus subterraneus (https://en.wikipedia.org/wiki/Hadenoecus), the cave beetle's food supplier. Indeed, I fully agree with that our data indeed imply that Hadenoecus subterraneus's well being would become the more immediately pressing issue when it comes to the potential effects of global warming on P. hirtus.
May 07, 2019
Exploring the temperature tolerance of a cave beetle
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OK people. 8 votes in meaning 2 guesses away from disclosure. Come on, we can do this! Recovering from polar vortex time...
Jan 31, 2019
Exploring the temperature tolerance of a cave beetle
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Jeff's excellent comment warrants some more information: In our experiment, short-term tolerance was defined as survival for 5 days. We started the experimental cultures at 11 degrees Celsius and increased the temperature by 2 degrees every 5 days. If anyone feels compelled to revise their initial guesstimate, please go ahead!
Jan 29, 2019
Exploring the temperature tolerance of a cave beetle
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Wow. Halfway there in 24 hours. And a very interesting spread of temps... Glad I started this. 4 more guesstimates needed. Polls will be open until the weekend no matter what! Thanks for everyone's input so far.
Jan 29, 2019
Exploring the temperature tolerance of a cave beetle
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