Whack! Jab! Crack! It's a Blackback Land Crab Smackdown | Deep Look
It's an all-out brawl for prime beach real estate! These Caribbean crabs will tear each other limb from limb to get the best burrow. Luckily, they molt and regrow lost legs in a matter of weeks, and live to fight another day.
You can learn more about CuriosityStream at https://curiositystream.com/deeplook
Help Deep Look grow by supporting us on Patreon!!
https://www.patreon.com/deeplook
PBS Digital Studios Mega-playlist:
https://www.youtube.com/playli....st?list=PL1mtdjDVOoO
DEEP LOOK is a ultra-HD (4K) short video series created by KQED San Francisco and presented by PBS Digital Studios. See the unseen at the very edge of our visible world. Explore big scientific mysteries by going incredibly small.
On the sand-dune beaches where they live, male blackback land crabs do constant battle over territory. The stakes are high: If one of these baby-faced crabs secures a winning spot, he can invite a mate into his den, six or seven feet beneath the surface.
With all this roughhousing, more than feelings get hurt. The male crabs inevitably lose limbs and damage their shells in constant dust-ups. Luckily, like many other arthropods, a group that includes insects and spiders, these crabs can release a leg or claw voluntarily if threatened. It’s not unusual to see animals in the field missing two or three walking legs.
The limbs regrow at the next molt, which is typically once a year for an adult. When a molt cycle begins, tiny limb buds form where a leg or a claw has been lost. Over the next six to eight weeks, the buds enlarge while the crab reabsorbs calcium from its old shell and secretes a new, paper-thin one underneath.
In the last hour of the cycle, the crab gulps air to create enough internal pressure to pop open the top of its shell, called the carapace. As the crab pushes it way out, the same internal pressure helps uncoil the new legs. The replacement shell thickens and hardens, and the crab eats the old shell.
--- Are blackback land crabs edible?
Yes, but they’re not as popular as the major food species like Dungeness and King crab.
--- Where do blackback land crabs live?
They live throughout the Caribbean islands.
--- Does it hurt when they lose legs?
Hard to say, but they do have an internal mechanism for releasing limbs cleanly that prevents loss of blood.
---+ Read the entire article on KQED Science:
https://www.kqed.org/science/1....933532/whack-jab-cra
---+ For more information:
The Crab Lab at Colorado State University:
https://rydberg.biology.colostate.edu/mykleslab/
---+ More Great Deep Look episodes:
Want a Whole New Body? Ask This Flatworm How
https://www.youtube.com/watch?v=m12xsf5g3Bo
Daddy Longlegs Risk Life ... and Especially Limb ... to Survive
https://www.youtube.com/watch?v=tjDmH8zhp6o
---+ See some great videos and documentaries from the PBS Digital Studios!
Origin of Everything: The Origin of Gender
https://www.youtube.com/watch?v=5e12ZojkYrU
Hot Mess: Coral Reefs Are Dying. But They Don’t Have To.
https://www.youtube.com/watch?v=MUAsFZuFQvQ
---+ Follow KQED Science:
KQED Science: http://www.kqed.org/science
Tumblr: http://kqedscience.tumblr.com
Twitter: https://www.twitter.com/kqedscience
---+ About KQED
KQED, an NPR and PBS affiliate in San Francisco, CA, serves Northern California and beyond with a public-supported alternative to commercial TV, Radio and web media.
Funding for Deep Look is provided in part by PBS Digital Studios. Deep Look is a project of KQED Science, which is also supported by the National Science Foundation, the Templeton Religion Trust, the Templeton World Charity Foundation, the S. D. Bechtel, Jr. Foundation, the Dirk and Charlene Kabcenell Foundation, the Vadasz Family Foundation, the Gordon and Betty Moore Foundation, the Fuhs Family Foundation and the members of KQED.
---+ Shoutout!
Congratulations to ?Jen Wiley?, who was the first to correctly ID the species of crab in our episode over at the Deep Look Community Tab:
https://www.youtube.com/channe....l/UC-3SbfTPJsL8fJAPK
#deeplook #pbsds #crab
