Olá pessoal,

Acaba de sair, finalmente, o artigo provando q nossa D.meristocaulis é uma pigméia australiana, vejam abaixo:

http://aob.oxfordjournals.org/content/e ... 6.abstract


Abs,
Fernando Rivadavia

P.S. Quem quiser copia do artigo, me mande uma PM.

"...Long-distance dispersal between southwestern Oceania and northern South America is the most likely scenario to explain the phylogeographic pattern revealed..."
Incrivel!

Belo artigo Fernando, é impressionante como a biodiversidade de nosso planeta ainda é capaz de nos surpreender. Os marsupiais são animais que além da Austrália e algumas ilhas da Oceania, também vivem nas Américas. Desta forma era de se esperar que algumas plantas daqui guardassem algum parentesco com as de lá. Foi apenas questão de tempo para os pesquisadores comprovarem isso. Em todo caso fico feliz por eles terem descoberto isso e você postado com exclusividade no fórum.

Abs,

Rodrigo F. Costa

Como assim, isso daria margem a alguém dizer que os continentes se separaram, que a Terra não é chata,
que os organismos sofreram seleção natural ... ... blasfêmia!

Já imagino uma explicação criacionista ... ... as sementes de D. meristocaulis boiaram durante o dilúvio e ficaram lá no alto do Pico
da Neblina. Você não viu um grande barco de madeira por lá?

Kkkkkk, boa Carlos! Vai dormir agora!

hi all,

thanks for sharing, Fernando.

the new is rather incredible for me....I didn't know that there are so many similarities between the south-american flora and the australian flora.
well, the case of the marsupials (wich are animals) could have given me an indication, but in my special case, the light didn't get on...

in any case : this mean that this plant came from australia to south-america many many years before, then the plant adapted itself to the south american conditions, and then found a very small spot-biotope to survive....good job !

the trip this little plant did is very long !
first, it have to adapt itself to the new south-american conditions, then it have to cross the continent to find a refuge in the venezuelian area by crossing the amazonian lowlands....or did the plant reached the venezuelian highlands before all the area was washed away by the amazonian stream ?

another question is: what can be the direct parentage of this plant ? what are it's most direct ancestors ?

Wegener told us about the tectonic dynamics : at the end of the Trias, all the continents were "glued" together

we see that australia is separated from south-america :
- by india and africa on the north way
- by antarctica on the south way

watch this little video : the animation begins 200 million years before, at the Trias.


antactica was always in the south-pole area, also before Trias. this mean that the plants didn't took this way to cross the Pangea continent : it was too cold !

the plants certainly took another way : thorough india and africa, wich was always situated at the good lattitudes. it reached the south american continent and begun it's dispersal before the amazonian stream began to flush everything away, and it's ultimate refuge are the venezuelian highlands.
all this mean that the plant is "at the end of the trip", and that d.meristocaulis is the very very last and ultimate descendants of the australian prime ancestor.
waow ! a few millions years more, and no one would have heard about it !

so...can this prime ancestor have some descendants in africa too ? did he left some traces there ?

Patrice, in this article we argue that it was a long distance dispersal event that brought the ancestors of meristocaulis from Australia to S.America, possibly in a single dispersal event. And that this was not that long ago, when continents were still joined into Gondwana.

The same thing happened with the ancestors of D.sessilifolia, which also seem to have made a long distance dispersal from Australasia to S.America - although much more recently, since sessilifolia is still interfertile with burmannii.



Best wishes,
Fernando

hi Fernando,

thanks for your reply

oh, so there can be no co-ancestors left in africa !

how can such a long distance dispersal take place ? by migrating birds ?

Realmente uma maluquisse esta separação das plantas de mesma espécie em 2 continentes diferentes.
Alem de que linda esta drosera. Valeu por compartilhar Fernando!

Well who says they came through Africa and not the other way around the planet?




I'd say wind (tropical storms!) is more likely than birds. Lots of seeds over millions of years... eventually one seed could fall in the right place.


Best wishes,
Fernando