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Re: Apistos in the south-(link to Felipe Cantera).
Hi
Thanks for the great info! Really enjoyed the reading.
I have some comments. I have read somewhere that the A. commbrae is perhaps the most primitive of all the Apisto species. Specialized to a very little extent. A "riverine" species as Romer writes in his book.
If thats correct, then it seems that the commbrae is a quite "old" species in the Parana and Paraguay river systems.
What is your opinion about that?
Best regards/ Per
Mike & Diane Wise <apistowise@bewellnet.com> wrote:
Per,
I looked at the fish. They definitely are not A. commbrae. A. commbrae -
and other members of the commbrae-complex (A. inconspicua & A. linkei) -
exhibits a very large blotch on the caudal peduncle. This blotch is
composed of a caudal spot & a highly pigmented part of the last vertical
bar (Bar 7) that have joined together. They normally are attached to the
lateral band. The fish on the Spanish site show a caudal spot that is
separated from Bar 7 by a relatively broad light colored area. This
feature is quite typical of species belonging to the regani-complex. The
fish pictured appear to be one of the many forms similar to A. geisleri.
The dark colored brood dress of the female in the pictures is very
typical of A. geisleri, too.
I imagine that they Czech 'commbrae' that you once had were also a form
of A. geisleri - possibly the source for the Spanish fish.
As for you question about Uruguayan apistos, I do not believe the
question can be answered one way or the other. The Rio Paraná and Rio
Uruguay do not actually join together. Both enter the Rio de la Plata
north of Buenos Aires, Argentina. The de la Plata actually is not a
river, but is a broad estuary highly influenced by the nearby Atlantic
Ocean. As such it is more like a large brackish water bay. Those
familiar with US geography can consider it similar the the Chesapeake
Bay, only the vast amount of freshwater entering from the Paraná &
Uruguay make it more brackish than marine. As such, I doubt that apistos
could have migrated down the Paraná and then up the Uruguay. The apistos
reportedly found at Salto, Uruguay probably entered the Rio Uruguay from
some of the nearby tributaries of the Rio Paraná via stream piracy
farther upstream. I cannot say whether temperatures, lack of adequate
collecting, or recent introduction into the Rio Uruguay - or a
combination of these - is the reason apistos are not found farther
south. My guess is that temperature is not the cause.
Only 5 apisto species (A. borellii, A. trifasciata, A. pleurotaenia, A.
commbrae, & A. inconspicua) are known from the entire Paraguay/Paraná
system. Of these, only A. borellii, A. commbrae, & A. pleurotaenia(?)
are endemic the the system. All of these species have closely related
species in the Amazon Basin - except A. borellii. As such A. borellii is
the only species of the genus that probably originated in the
Paraguay/Paraná system. The lack of species diversity indicates that
apistos probably have not inhabited the Paraguay/Paraná system for more
than a few thousand years - except A. borellii. Somehow A. borellii or
its ancestors probably arrived earlier along with M. altispinosus. A.
borellii is a very unusual Apistogramma species. It has physical and
behavioral characteristic features as different as those of
Apistogrammoides & Taeniacara. I personally would not be surprised that
it is given its own genus sometime.
Mike Wise
Per Wigstal wrote:
>Hi Mike!
>
>Yes, I´m really curious about where the southern boundry is for the apisto species? If I understand Felipe Cantera right, there are no apistos found in the southern part of Uruguay. I wonder If that´s because of the climate, or the absence of rivers connecting to the uruguay river?
>
>By the way, while I was searching the net for info about Ap.Commbrae I came across this spanish page.
>
>http://atlas.drpez.org/view_album.php?set_albumName=albuv15
>
> Would you say that this fish is a Ap. commbrae? I´m not sure. Shouldn´t the lateral line connect to the tail-spot? It´s interrupted on this fish.
>I had wildcaught commbraes some years ago that came as bycatch with a batch of Borellis from Mato Grosso. They had a clear thick lateral line which ended up on the tail-root as a spot. I also had, what I thought were czech bred Commbraes. And they looked very much like the fish on the page linked. They were definately a commbrae group member, But I was never sure if they really were commbraes.
>
>Best regards/ Per
>
>
>Mike & Diane Wise wrote:
>Per,
>
>It looks like A. commbrae all right. If the fish pictured at:
>http://www.aqvaterra.com/photos/peces/galeria_ciclidos/apistogramma_commbrae_550x380.jpg
>is from Salto, then it is the most southern documented apisto in South
>America. It would be interesting to learn if other apisto species do
>occur in Uruguay. BTW the Aqva Terra web site in both Spanish & English.
>
>Mike Wise
>
>Per Wigstal wrote:
>
>
>
>>I just found the website of Felipe Cantera! But it´s in spanish so I can´t read it.
>>
>>http://www.aqvaterra.com/viajes.php#info_viajes
>>
>>(There´s in fact a picture of a A. Commbrae on one of the pages.)
>>
>>Best regards/ Per
>>
>>
>>
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>
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