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GBR Press: Pink iguana discovered

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Posted by: W von Papine鋟 at Tue Jan 6 01:30:17 2009  [ Report Abuse ] [ Email Message ] [ Show All Posts by W von Papine鋟 ]  
   

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THE TELEGRAPH (London, UK) 05 January 09 Pink iguana discovered on Galapagos (Louise Gray)
A new species of iguana with unusual pink skin has been discovered by scientists on the island where Charles Darwin first developed his theory of evolution.
The large lizard, which is at risk of extinction, has rose-coloured scales and only lives on one volcano in the Galapagos Islands.
Darwin, whose 200th birthday will be celebrated on February 12, observed both marine and land iguanas when he visited the archipelago in 1835.
The way the creatures adapted themselves to their surroundings helped to develop his revolutionary ideas about natural selection.
But he never explored the Volcan Wolf volcano on the island of Isabela and therefore did not see the pink iguana.
The creature was first spotted in 1986 by park rangers but was dismissed as a curiosity and soon forgotten.
It is only now that scientists have discovered that the "rosada" – or pink – iguana is a species in its own right after comparing its genes with other land iguanas on the Galapagos.
There were also physical differences, besides the striking pink and black-striped colouring. Pink iguanas had flat head scales, unlike other land iguanas, and a thick fatty crest on the back of the neck with small conical scales.
Action is now needed to prevent this scientifically valuable creature becoming extinct, say the researchers writing in the journal Proceedings of the National Academy of Sciences.
The discovery comes as seventeen previously unknown species of reptiles and amphibians were found in the threatened rainforests of eastern Tanzania.
The new species, which include chameleons, tree frogs and snakes, were discovered by scientists from the Natural Science Museum of Trento in Italy.
The discovery shows the rich biodiversity of the area which is under threat from fire, logging, collection of wood for fuel and land clearance for cultivation.
http://www.telegraph.co.uk/news/worldnews/southamerica/galapagos/4126490/Pink-iguana-discovered-on-Galapagos.html

QUOTIDIANO NAZIONALE (Bologna, Italy) 05 January 09 Scoperta alle Galapagos l'iguana rosa (Fonte Agi)
Londra: Era il 1835 quando il grande naturalista Charles Darwin approdò alle isole Galapagos a 26 anni. Finora si è sempre pensato che non fosse sfuggito nulla alla sua scrupolosa attenzione, invece, c’è un’iguana rosa che vive lì da solo. Darwin non peccò di negligenza o disattenzione, semplicemente non vide l’iguana perchè non visitò il vulcano Wolf, dove è stata scoperta. Sono state le ricerche, riguardanti la ricostruzione delle origini dell’iguana di terra del gruppo Conolophus, che hanno fatto sì che venisse scoperto uno dei più antichi segni dell’evoluzione della specie: l’iguana rosa a striscie nere.
Lo studio genetico è stato pubblicato sulla rivista dell’Accademia delle Scienze "PNAS" ed stato fatto dal gruppo di lavoro di Gabriele Gentile dell’Università Tor Vergata di Roma. Volendo ricostruire l’albero genealogico dell’iguana, bisogna andare indietro più di 5 milioni di anni fa, quando è comparso il suo primo antenato. "Non siamo i primi ad aver visto quest’iguana, ma siamo i primi ad aver detto cos’è e a che specie appartiene" ha specificato Gentile, in un’intervista telefonica. Fu un ranger del parco nazionale ad avvistare casualmente, nel 1986, un esemplare di quest’iguana, ma è la prima volta che è stato messo sotto la lente d’ingrandimento di alcuni studiosi. Che il rettile abbia origini antichissime lo dimostra il confronto del Dna relativo ai mitocondri dell’iguana rosa con le altre specie rosa. E ciò che allo stato attuale urge è una mobilitazione efficace per prevenire la possibile via d’estinzione del fossile.
http://quotidianonet.ilsole24ore.com/esteri/2009/01/05/142521-scoperta_alle_galapagos_iguana_rosa.shtml

47 NEWS (Japan) 06 January 09 ピンク色のイグアナを確認 ガラパゴスで伊チーム
【ワシントン5日共同】南米エクアドルのガラパゴ ス諸島で、ほぼ全身がピンク色をした新種のイグアナ の生息を確認したと、イタリアのトルベルガータ大な どの研究チームが5日、 米科学アカデミー紀要 (電子版)に発表した。
イグアナはトカゲの仲間で、チームによると、 同諸島にはリクイグアナ2種、ウミイグアナ1種の 固有種がいる。 今回確認されたのは新たなリクイグアナで、 最大の島イサベラ島北部の火山周辺に生息していた。 英生物学者ダーウィンが1835年に同諸島を探検 した際には訪れなかった地域だという。
黄色っぽい他のリクイグアナと異なり、い筏弈敜伪持肖赛いしっぽを除いてピンク色。首の後ろがなだらかに盛り上がっているのも特徴だ。
遺伝子解析の結果、進化の面では、他のリクイグアナよりずっと前に枝分かれしたリクイグアナの原形に近い種と判明。地元の保護関係者が1986年に見つけたが、科学論文の発表は初めて。
チームはこれまでに36匹を確認したが、生息数が極めて少なく、絶滅が心配されるという。
http://www.47news.jp/CN/200901/CN2009010601000177.html


   

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