I for one welcome our new crayfish overladies

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I for one welcome our new crayfish overladies

Postby Gord » Wed Feb 07, 2018 3:18 am

https://news.nationalgeographic.com/201 ... umors-spd/

Growing Population of Crayfish Has One Female Ancestor
The new species reproduces by cloning itself and is entirely female.

...A slough crayfish was fished from the Everglades in the U.S. and taken to an insect fair in 1995 where a hobbyist bought it. Then, for reasons unknown, that slough crayfish became a new species called a marbled crayfish (Procambarus virginalis) after it began reproducing asexually, essentially cloning itself.

Unable to care for the rapidly increasing offspring, the original owner took them to pet shops where other hobby aquarium keepers bought them. Since then, the world has been invaded by that one crayfish's daughters. "That one animal founded the whole species, and now we have billions worldwide," says Wolfgang Stein, a neuroscientist at Illinois State University....

...Researchers were also surprised to find that marbled crayfish had three sets of chromosomes. Most animals have only two sets: one from each parent.

Lyko says this likely influences how genes are expressed in each new marbled crayfish. Not only would this provide a buffer from inheriting a genetic mutation, but it may also help the species adapt to a host of different environments.

Marbled crayfish are currently found throughout Europe and Madagascar. Stein says in just a decade's time, they've been able to grow from occupying a space the size of Rhode Island to occupying a space the size of Ohio.

Not only that, they also exist throughout the country's varied ecological regions. On his website, biologist Zen Faulkes from the University of Texas Rio Grande Valley keeps an updated map of where marbled crayfish can be found. They're considered an invasive species that aggressively outcompetes comparable marine organisms....

Yup, we all gonna die.
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Re: I for one welcome our new crayfish overladies

Postby scrmbldggs » Wed Feb 07, 2018 3:40 am

.

Lard, save me from your followers.

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Re: I for one welcome our new crayfish overladies

Postby TJrandom » Wed Feb 07, 2018 3:42 am

Wow! I want to farm them. I envision a chain of fast food eateries selling pink marbled virgin sandwiches, pink marbled virgin pizza, pink marbled virgin pina colatas.... :pinkhappy:

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Re: I for one welcome our new crayfish overladies

Postby Aztexan » Wed Feb 07, 2018 4:06 am

trumpimal-crawfish-bbb.jpg

Yup. We're dead.
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Re: I for one welcome our new crayfish overladies

Postby JO 753 » Wed Feb 07, 2018 5:23 am

They taste like shrimp, rite?

Then we all gonna die fat.
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Re: I for one welcome our new crayfish overladies

Postby scrmbldggs » Wed Feb 07, 2018 5:25 am

Fat clones. :fr5:
.

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Re: I for one welcome our new crayfish overladies

Postby Matthew Ellard » Wed Feb 07, 2018 7:19 am

Gord wrote:Yup, we all gonna die.

"Researchers were also surprised to find that marbled crayfish had three sets of chromosomes."

I'm still not sure I fully understand what that means. If there is no male chromosome, and only one parent, then it's two additional chromosomes?

Hmmmm. Here are photos of the marbled crayfish. I can't see anything special.
Marbled-Crayfish_grande.jpg
marbled_crayfish.jpg
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Re: I for one welcome our new crayfish overladies

Postby Poodle » Wed Feb 07, 2018 7:54 am

BUT WHAT ABOUT THE FLAVOUR?
Sheesh - people don't know what's really IMPORTANT these days!

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Re: I for one welcome our new crayfish overladies

Postby TJrandom » Wed Feb 07, 2018 10:40 am

Poodle wrote:BUT WHAT ABOUT THE FLAVOUR?
Sheesh - people don't know what's really IMPORTANT these days!


Not to worry... When blended in that high powered blender/mixer - if the smoothie doesn`t taste just right, add an earthworm or two.

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Re: I for one welcome our new crayfish overladies

Postby Gord » Wed Feb 07, 2018 8:12 pm

Matthew Ellard wrote:
Gord wrote:Yup, we all gonna die.

"Researchers were also surprised to find that marbled crayfish had three sets of chromosomes."

I'm still not sure I fully understand what that means. If there is no male chromosome, and only one parent, then it's two additional chromosomes?

They're clones, but the original had two parents: http://www.sciencemag.org/news/2018/02/ ... over-world

An aquarium accident may have given this crayfish the DNA to take over the world

...the marbled crayfish has three sets of 92 chromosomes, not the usual two, and each set is essentially a version of the chromosomes belonging to the slough crayfish (P. fallax). Two of the three sets of chromosomes are virtually identical, but the third is different enough that Lyko’s team concludes the marbled crayfish likely arose from the mating of two slough crayfish from different regions of the world thrown together in an aquarium. One must have had an abnormal egg or sperm that retained two copies of its chromosomes instead of the usual single set that is in such germ cells, Lyko explains....


Hmmmm. Here are photos of the marbled crayfish. I can't see anything special.

Psst! You can't see their chromosomes with the nekked eye! :P
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Re: I for one welcome our new crayfish overladies

Postby Gord » Wed Feb 07, 2018 8:14 pm

Poodle wrote:BUT WHAT ABOUT THE FLAVOUR?
Sheesh - people don't know what's really IMPORTANT these days!

I know, right? These scientists don't know what's important. Not like the ones working on Cheddar Man: http://www.sciencemag.org/news/2018/02/ ... ern-humans

Image
...he looks delicious....


OMG. "Cheddar man" on the one hand and a crayfish that can eat just about anything on the other? See??? I told you!!! WE'RE DOOOOOOMED!!!
"Knowledge grows through infinite timelessness" -- the random fictional Deepak Chopra quote site
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Re: I for one welcome our new crayfish overladies

Postby ElectricMonk » Thu Feb 08, 2018 6:56 am

Strictly speaking, they aren't clones.
The process is called parthenogenesis, and many animals can switch between sexual reproduction and parthenogenesis, depending on the presence of mates and abundance of food and space.
The offsprings are produced from non-fertilized egg cells, which themselves have undergone mutation during the process of oocyte production.
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Re: I for one welcome our new crayfish overladies

Postby Matthew Ellard » Thu Feb 08, 2018 7:17 am

Ok. This isn't that unusual.

" The suspected tetraploid (possessing four chromosome sets) plains viscacha rat (Tympanoctomys barrerae) and golden vizcacha rat (Pipanacoctomys aureus)[29] have been regarded as the only known exceptions (as of 2004).[30] However, some genetic studies have rejected any polyploidism in mammals as unlikely, and suggest that amplification and dispersion of repetitive sequences best explain the large genome size of these two rodents.
https://en.wikipedia.org/wiki/Ploidy#Diploid

Parthenogenesis
https://en.wikipedia.org/wiki/Parthenogenesis

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Re: I for one welcome our new crayfish overladies

Postby Gord » Thu Feb 08, 2018 8:26 am

ElectricMonk wrote:Strictly speaking, they aren't clones.
The process is called parthenogenesis, and many animals can switch between sexual reproduction and parthenogenesis, depending on the presence of mates and abundance of food and space.
The offsprings are produced from non-fertilized egg cells, which themselves have undergone mutation during the process of oocyte production.

Well yeah but:

Matthew Ellard wrote:Parthenogenesis
https://en.wikipedia.org/wiki/Parthenogenesis

...The offspring having all of the mother's genetic material are called full clones and those having only half are called half clones....

https://en.wikipedia.org/wiki/Cloning

...In biology, cloning is the process of producing similar populations of genetically identical individuals that occurs in nature when organisms such as bacteria, insects, plants or animals reproduce asexually....

Apparently, they are clones? :?
"Knowledge grows through infinite timelessness" -- the random fictional Deepak Chopra quote site
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Re: I for one welcome our new crayfish overladies

Postby ElectricMonk » Thu Feb 08, 2018 12:53 pm

No, they are not.
The mother's genes are recombined during meiosis, so each daughter is different, even if only slightly so.
Clones on the other hand occur past meiosis when the genome is already set, such as a dividing bacteria or identical twins.
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Re: I for one welcome our new crayfish overladies

Postby Matthew Ellard » Thu Feb 08, 2018 9:33 pm

Can you see how I'm getting confused. Read this wikipeadia article

Marmorkrebs (marbled crayfish) are the only known decapod crustaceans to reproduce only by parthenogenesis.[2] All individuals are female, and the offspring are genetically identical to the parent.[3][6] Marmorkrebs are triploid animals,[3][7] which may be the main reason for their parthenogenetic reproduction. Marmorkrebs are thus a model for the rapid generation of species.[3]
https://en.wikipedia.org/wiki/Marmorkrebs

Aren't they two conflicting statements? If the offspring are identical how is it the rapid generation of a new species? :D

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Re: I for one welcome our new crayfish overladies

Postby ElectricMonk » Fri Feb 09, 2018 3:11 am

wiki is wrong here, since parthenogenisis is, to be precise, not a-sexual but incomplete sexual reproduction, unlike plain cell division.
A species that only clones itself would be quickly wiped out unless it has abnormaly high mutation rates.
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Re: I for one welcome our new crayfish overladies

Postby Gord » Fri Feb 09, 2018 6:49 am

ElectricMonk wrote:wiki[pedia] is wrong

I think this should not come as a shock to anyone.
"Knowledge grows through infinite timelessness" -- the random fictional Deepak Chopra quote site
"Imagine an ennobling of what could be" -- the New Age BS Generator site
"You are also taking my words out of context." -- Justin
"Nullius in verba" -- The Royal Society ["take nobody's word for it"]
#ANDAMOVIE


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