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 The Cloning Crayfish-A New Invasive Species

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falcon

falcon

Male Number of posts : 1546
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PostSubject: The Cloning Crayfish-A New Invasive Species   The Cloning Crayfish-A New Invasive Species EmptyFebruary 13th 2018, 11:01 am

The marbled crayfish mutated about 25 years ago and is now able to clone itself.  All the crayfish are females that lay fertilized eggs. 

What a deal for crawdad eaters.  

Quote :
Scientists quickly realized the marbled crayfish were not just in German aquariums. The self-replicating creatures were out in the wild, and they were aggressive invaders. “Every single one has the ability to reproduce. Every single one could start a new population,” says Zen Faulkes, a crustacean researcher at the University of Texas at Rio Grande Valley who keeps a map of marbled crayfish invasions. You can easily buy marbled crayfish online (though they are now banned in the European Union and some U.S. states). The species has shown up in the wild in Germany, Italy, Slovakia, Sweden, Japan, and Madagascar. “We’re being invaded by an army of clones,” says Faulkes.


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

OldMtnMan

Male Number of posts : 10258
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PostSubject: Re: The Cloning Crayfish-A New Invasive Species   The Cloning Crayfish-A New Invasive Species EmptyFebruary 13th 2018, 11:03 am

When humans can do that we're screwed!

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Pete

I'm addicted to black powder.
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patocazador

patocazador

Number of posts : 5853
Age : 76
Location : central Florida
Registration date : 2012-08-22

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PostSubject: Re: The Cloning Crayfish-A New Invasive Species   The Cloning Crayfish-A New Invasive Species EmptyFebruary 13th 2018, 11:40 am

@falcon wrote:
The marbled crayfish mutated about 25 years ago and is now able to clone itself.  All the crayfish are females that lay fertilized eggs. 

What a deal for crawdad eaters.  

Quote :
Scientists quickly realized the marbled crayfish were not just in German aquariums. The self-replicating creatures were out in the wild, and they were aggressive invaders. “Every single one has the ability to reproduce. Every single one could start a new population,” says Zen Faulkes, a crustacean researcher at the University of Texas at Rio Grande Valley who keeps a map of marbled crayfish invasions. You can easily buy marbled crayfish online (though they are now banned in the European Union and some U.S. states). The species has shown up in the wild in Germany, Italy, Slovakia, Sweden, Japan, and Madagascar. “We’re being invaded by an army of clones,” says Faulkes.


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

Great news. I love crawfish. 

The Alabama Crawfish Festival is held annually in April about 35 miles west of my old hunt club. It was a great time and they had the best crawfish pie that I ever ate.

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Bob

"My reading of history convinces me that most bad government results from too much government." -Thomas Jefferson
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RonC
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RonC

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PostSubject: Re: The Cloning Crayfish-A New Invasive Species   The Cloning Crayfish-A New Invasive Species EmptyFebruary 17th 2018, 11:55 am

The species did not exist until about 25 years ago. The research group did DNA sequencing of the new clone crayfish and compared it to 15 other common crayfish. They traced the ability to clone to a single gene mutation. The mutation immediately differentiated it from the slough crayfish found in Georgia and Florida. The single mutation instantly created a new species that couldn't interbreed with the original species. Male slough crayfish try to mate with the new, marbled crayfish, but fail.
Ron

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RonC
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RonC

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PostSubject: Re: The Cloning Crayfish-A New Invasive Species   The Cloning Crayfish-A New Invasive Species EmptyFebruary 17th 2018, 5:01 pm

A big problem is that these marble crayfish are displacing the native crayfish.
According to an article in Biocontrol: "The impacts of invasive alien crustaceans (IAC) are substantial, due to the complex trophic role of most of these species leading to cascading effects throughout the invaded ecosystems. IAC also have the potential to cause a shift in the ‘keystone’ ecosystem functions, changing energy flux and nutrient cycles which together affect critical ecosystem services such as biodiversity, fisheries yield and water quality." In other words, the marbled crayfish could directly impact other crustaceans and the effect cascades up the food chain.
My WAG (wild-a$$ed-guess) is that they may be too big for some fish species who depend on the smaller, native populations.
I can see a new movie coming out: "The attack of the giant crayfish." George Clooney is slowly eaten by a mob of voracious crayfish. Leonardo DiCaprio and Mark Wahlberg play characters who fight off the attacking crustaceans. Uma Thurman plays the leading woman role, a temperamental person who is envious of the crayfish's ability to clone itself. She goes back to college to learn molecular genetics so that she can clone herself by the hundreds.
Ron

Ron

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RonC
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PostSubject: Re: The Cloning Crayfish-A New Invasive Species   The Cloning Crayfish-A New Invasive Species EmptyFebruary 17th 2018, 8:33 pm

I've seen papers on the positive effects of invasive species like the zebra mussel and the Asiatic clam. The Asiatic clam filtered the volume of a 10 mile stretch of the Potomac River in 3 days. They singlehandedly removed huge algae blooms from the river. That was good.

The problem is that the now clear water permitted the aquatic vegetation (Hydrilla) that roots in the sediment and grows to the surface, to grow extensively. They clogged the marinas and boats could not go in or out. They collected on the intake screens of the electric power plants. The Asiatic clams joined the Hydrilla to clog the intakes of the power plants and cost millions to remove.

The Corps of Engineers came in and started to harvest and chop up the "Killa Hydrilla" to get rid of it (against our advice). Each piece of Hydrilla gave rise to a complete, new Hydrilla and it spread even faster. It was like Mickey Mouse's broom in the movie Fantasia. Chopped into pieces, each sliver gave rise to a new broom.

The point is that the chain of events, positive or negative, is difficult or impossible to predict with these invasive species.

Reference:
Cohen, R.R.H., et al., 1984,  The effect of the Asiatic clam, Corbicula fluminea on phytoplankton of the Potomac River, Maryland:  Limnology and Oceanogra­phy 29(1): 170‑ 180.

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patocazador

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PostSubject: Re: The Cloning Crayfish-A New Invasive Species   The Cloning Crayfish-A New Invasive Species EmptyFebruary 18th 2018, 8:35 am

Ron, if the mutation in the crawfish occurred naturally rather than in a lab, they shouldn't really do anything about it if it occurs naturally in North America. That would be like killing all red-headed people because they didn't exist until a mutation naturally occurred.

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Bob

"My reading of history convinces me that most bad government results from too much government." -Thomas Jefferson
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RonC
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PostSubject: Re: The Cloning Crayfish-A New Invasive Species   The Cloning Crayfish-A New Invasive Species EmptyFebruary 18th 2018, 9:40 am

Bob, the mutation may have occurred in German Hobbyist's aquariums. "It is a parthenogenetic crayfish that was discovered in the pet trade in Germany in the 1990s." Prior to the appearance in captivity, no asexually reproducing crayfish were found in the wild. "It is suspected to have been created through a reproductive accident in an aquarium around 1995. A new analysis of the crustacean’s genome supports this unlikely origin."

The hobbyists started sharing the eggs and progeny of the crayfish among each other. The females (there are no males) produce eggs so fast that the hobbyists discarded them in local water ways.

“They eat anything—rotten leaves, snails or fish broods, small fish, small insects," says Frank Lyko, a molecular geneticist at the German Cancer Research Center in Heidelberg. “This crayfish is a serious pest,” adds Gerhard Scholtz, an evolutionary biologist at Humboldt University in Berlin, who has tracked its rapid spread across the globe, including Madagascar, where its success threatens the existence of the seven crayfish native to that island country. The European Union banned the species: It must not be sold, kept, distributed, or released to the wild.

It has invaded and taken over water bodies in: Croatia, Czech Republic, Germany, Hungary, Italy, Japan, Madagascar, Netherlands, Romania,  Slovakia, Sweden, Ukraine.

Attack of the Crayfish Monster:
The Cloning Crayfish-A New Invasive Species Croatia, Czech Republic, Germany, Hungary, Italy, Japan, Madagascar, Netherlands, Romania,  Slovakia, Sweden, Ukraine

The Cloning Crayfish-A New Invasive Species MV5BNzA3MGFlNjEtYTVjMi00ZmIxLTk4MGEtZTk4MGUyZjA3OTNmXkEyXkFqcGdeQXVyMDUyOTUyNQ@@._V1_SY1000_CR0,0,390,1000_AL_
Ron

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patocazador

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PostSubject: Re: The Cloning Crayfish-A New Invasive Species   The Cloning Crayfish-A New Invasive Species EmptyFebruary 18th 2018, 1:21 pm

Cajuns will love them and if I can find a good crawfish boil spice pack, so will I.

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RonC
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PostSubject: Re: The Cloning Crayfish-A New Invasive Species   The Cloning Crayfish-A New Invasive Species EmptyFebruary 18th 2018, 1:28 pm

In SE Asia, they fry up the Asiatic clam and serve them like popcorn at the movie houses. With shell, they are only thumbnail sized. Prepared like that, they are pretty tasty, but you have to eat a load of them to fill up.
I must say that having crayfish the size of the marble ones would be very nice. The usual little ones are barely worth fussing with.
Ron

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Outside of a Dog, a Book is Man’s Best Friend. Inside of a Dog, It’s Too Dark to Read. Groucho Marx (or possibly someone earlier)
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oneshot 1

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PostSubject: Re: The Cloning Crayfish-A New Invasive Species   The Cloning Crayfish-A New Invasive Species EmptyFebruary 19th 2018, 1:09 pm

I'll take care of them.

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