The Pterophyllum Study

[raglan]

http://www.google.ca/search?hl=en&rl...=&oq=&gs_rfai=


Hi, friends. long time !

this study is invalid IMO, as they did not get real altum from anywhere near where you would get the real altum guaranteed. they mention the St. Isabel fish though... {sigh}

cheers Heiko !

In the P. scalare specie, a complex
phylogeographic history was found, resulting from ancient fragmentation events followed by
episodes of geographic expansion and restricted gene flow with isolation by distance.
Although the relation between geographic, genetic and morphological distances was not
significant in the studied area, it had higher genetic and morphological variation within
localities. This result may be attributed to the Amazon floodplain that offers
intercommunication, allowing gene flow and the morphologic homogeneity found in the
sampled locations. The morphologic homogeneity observed in P. scalare specie along the
sampled sites may be related with the ecological resource availability and the inexistence of
sympatric species, differing from regions with P. scalare and P. altum (Santa Isabel and Boa
Vista), suggesting the existence of phenotype plasticity in P. scalare and the morphometric
pattern found in P. altum may be a result of the presence of P. scalare. The distinct water
composition may have significantly influenced the morphometric differentiation and
population genetic structure and maybe a limiting factor for the dispersion of this fish. Put
differently the significant morphometric differentiation between habitats may be a
consequence of genetic drift accumulation. Thus, it is necessary to identify the ecological
importance of morphometric variation found between different environments for a complete
understanding of the adaptive and evolutionary value of these morphological variations.

We'll wait for the real thing. they wouldn't listen