Stingray Identification By River + DNA Barcoding Potamotrygon

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Miles

Miles

Stingray King
MFK Member
Jul 2, 2005
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Spokane, WA
Rayman sent me these links.. I don't know why he didn't share.

Check it out.
http://www.evoamazon.net/Legal_supporting_data/Potamotrygon_figures.pdf

and this very in-depth interesting article,
http://www.scielo.br/pdf/gmb/v31n1s0/28.pdf


If anyone can make sense of the DNA barcoding, please share.. Basically what I gathered is that the species is evolving right in front of our eyes and is creating lots of new species. P. Motoro, P. Orbignyi, and P. Scobina are very widespread, more than we probably expect. P. Iwamae are not as distant as we believe.. and that we will likely never 100% understand the different species of potamotrygon because the resources aren't available.
 
whoa.....ill make this my night time read.... i can email these to my friend and see if he can explain the dna bar coding....
 
Hi Miles,

I've been waiting for almost 6 months for this article.
The pdf with the pictures and the DNA data was online since then.

This was believed to clarify and did make everything more confuse.
I'm not a biologist, so I did ask some biologist.
They told me, that COI is not the best choice if species are very close together.
If species have a hybridogenesis, COI can lead to confusion, because this mitochondrial DNA will be transmitted only from the mother.
So further studies with microsatellite DNA markers may deliver better results.

The only good thing is, that the data suggest that pearl rays are a distinct species (Potamotrygon cf. motoro in this work, name is not the same as in the picture-pdf).
And the cf. histrix from Rio Negro (Potamotrygon sp.1) are a distinct species too.
So we will have at least two new described species soon (for cf. histrix this is in the works for several years).

As you can see on the pictures, the scobina are not the species we keep as scobina in our tanks. Our scobinas come from Xingu and show three rows of spines on the tail. The scobinas in this work are from Marajo Bay and some other rivers with spines on the tail in one irregular row.
 
Thats a great article. I had to go and get my big South American map and mark it all up. Thanks for posting it!
 
am curious about what anyone gleaned from this paper. As far as 'species' goes, it looks like the jury is still out, the more we know, the more we don;t know.
 
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