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Crawfish from Germany that can reproduce itself by cloning is taking over Madagascar * 1
    #24990309 -

https://www.theatlantic.com/science/archive/2018/02/attack-of-the-crayfish-clones/552236/

This is a really cool article. Some species can reproduce via "virgin" birth, a process called parthogenesis. Scientists recently sequenced the DNA of specimens from Germany and Madagascar and both are genetically nearly identical.

This is really cool, but since the species reproduces asexually, they are able to outcompete native species. Every female reproduces identical female offspring that will themselves produce only identical female offspring. This leads to a big problem as an invasive species.

The downside for the marbled crawfish is that they are highly susceptible to any sort of disease or other selection pressure, because their genetics are identical.

Quote:
For the first time, scientists have now fully sequenced the DNA of the marbled crayfish. In fact, they sequenced not one but 11 crayfish—including those originating from German pet shops as well as wild ones caught in Madagascar. The creatures are indeed clones of each other, all descended from a single crayfish that somehow gained the ability to reproduce on its own. They had remarkably little genetic diversity. At most four letters in their entire DNA sequence differed in a meaningful way.


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Re: Crawfish from Germany that can reproduce itself by cloning is taking over Madagascar [Re: myco myco unday]
    #24990369 -

Observations of unique and fast moving evolution and speciation are often fun. We usually think of evolution as achingly slow, but it's not always that way.


I'm impressed how much proliferation the animal has considering there is effectively no genetic variation. Of course it "must" be vulnrable to environmental change, but now we have the chance to observe if that is the case or not. It has already demonstrated fitness in various niches without variation itself. It will have some resiliance when the fitnesss landscape around those niches changes. Mutations still can happen though, even in cloning. I dont understand the mechanism here with 3 chromosoms at all, but it seemed like some genetic variation might be on the table in the future? Dont know.


It looks like there could be a lot of unique observations made here that will give new insights.  It nice to see "normal" science be fun and interesting.

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Re: Crawfish from Germany that can reproduce itself by cloning is taking over Madagascar [Re: DieCommie]
    #24990414 -

This kind of burst in monogenetic growth is almost always followed by a rapid deterioration caused by disease, which due to their lack of genetic diversity they have little in the way of defence.


--------------------
I don't know shit.
And the more I know,
The more I realize it.

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Re: Crawfish from Germany that can reproduce itself by cloning is taking over Madagascar [Re: myco myco unday]
    #24990914 -

Makes me wonder how many non-cloned individuals exist?

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Re: Crawfish from Germany that can reproduce itself by cloning is taking over Madagascar [Re: Byrain]
    #24991016 -

Indeed byrain.

I found this article that breaks it down and has a map of incidents worlwide

Also it seems they have some manner of adaptation so they might not have that backfall.

https://blog.education.nationalgeographic.org/2018/02/07/cloned-crayfish-are-taking-over-the-world/


--------------------
I don't know shit.
And the more I know,
The more I realize it.

Edited by Zyiadem (02/13/18 10:43 AM)

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Re: Crawfish from Germany that can reproduce itself by cloning is taking over Madagascar [Re: Zyiadem]
    #24992122 -

Oh, okay that helps me understand a bit more. The marbled crayfish, Procambarus fallax f. virginalis is a mutation of the slough crayfish, P. fallax. I guess its mostly if not only the marbled crayfish that is invasive.

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