Saturday, February 6, 2010

Another set of data on S. dentex from Neretva from BTRG

Although, I believe that results of this research are somewhat inconclusive, you can read its summary text below as posted on Balkan Trout Restoration Group blog.

"In the past year, BTRG has performed a comprehensive genetic analysis of dentex trout from the River Neretva. This time we applied an extended set of molecular markers and included for comparison several specimens of "real glavatica" (i.e., marmorated trout from the Neretva), which were badly missing in our preliminary study.
Contrary to our previous hypothesis, dentex trout turned out as genetically indistinct from marmorated trout of the Neretva. We assume that a phenotype characteristic of dentex trout had probably evolved as a consequence of specific local adaptation.
The Balkan Peninsula is home to the most diverse collection of salmonids in the world. Nevertheless, many taxonomic uncertainties remain unresolved despite over a century of studies. Conservation of Balkan salmonid biodiversity hinges in large part upon addressing such uncertainties and is therefore of paramount importance. A notable example is found in the enigmatic Salmo dentex, which has been described by various authors in discontinuous populations ranging from the Aoos river in Greece to the Krka river drainage in Croatia. Current reports suggest it has disappeared from much of its previous range. At present, several contradictory opinions predominate on the taxonomic status of S. dentex without any broad consensus. To help resolve this issue we performed a rigorous molecular genetic analysis using a robust array of mtDNA, microsatellite, and nuclear gene markers of so-called S. dentex of the lower Neretva river drainage alongside other co-inhabiting endemic salmonids (i.e. S. obtusirostris, S. marmoratus, S. trutta). Our results clearly showed three genetically distinct lineages of salmonids with S. dentex being phenotypically distinct yet genetically indistinct from S. marmoratus of the lower Neretva. Based on our results and previous molecular results on Montenegrin dentex, it is clear that S. dentex is not a monophyletic lineage and should not be considered a distinct species on a genetic basis. We hypothesize S. dentex to most likely be polyphyletic assemblage of fish sharing a similar life history and unified phenotype evolved as a consequence of specific local adaptation.


OwenE2 said...

Hello Santa

Two beautiful blogs, even though I'm a vegetarian. However - and you'll hate me for saying this now the blog's all set up - as in this post, the plural of trout is trout, not trouts.

OwenE2 said...

Hello Santa

The last thing you want is someone telling you there's a mistake in the
title after you've gone to the hard work of uploading all those photos and

Seriously from what I've seen from pictures the Neretva is such a beautiful
river it's important for people to campaign to protect it from further
damage. I remember a long time ago seeing a television programme about
endemic species (?subspecies) of trout in the upper reaches of rivers in

It's hard to fight vested interests, but if you don;t fight you don't win.
How can we challenge the destruction of the Amazon rainforest when we've
not only already done the same thing, we're still doing it? But it's not a
hopeless battle - earlier this week I was talking to a friend about how
Epping Forest was saved for the people of London (from enclosure and
agriculture) by a campaign in the 1860s. The cruciao thing is to get the
message across to ordinary people about what's being taken away from them.

I wish you every success.

All the best


Santa said...

New for disqus from neretva-trout

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