Tuesday 29 October 2013

Remote Queensland Rainforest "Lost World" - Newly-Discovered Refugium of Ancient Creatures

DISCOVERED ON OCTOBER, 2013 BY DR. CONRAD HOSKINS OF JAMES COOK UNIVERSITY and TIM LAMAN OF HARVARD UNIVERSITY ON A FOUR-DAY EXPEDITION FUNDED BY THE NATIONAL GEOGRAPHIC SOCIETY......

WHO KNOWS WHAT IS YET TO BE DISCOVERED AT THIS UNIQUE REMOTE PLATEAU AND WHAT CLIMATIC CONDITIONS ENABLED THESE RELICT POPULATIONS TO SURVIVE ONLY 900 MILES NW OF BRISBANE, AUSTRALIA?   (Sources:   Daily Telegraph, UK and Christian Science Monitor )

Unfortunately, the survival of all of the high-altitude Queensland rainforests are under threat from climate warming because as temperatures rise with altitude, the changing climatic zones will cause extinctions.

High on a remote 1.8 mile square upland plateau of Cape Melville, Queensland, accessible only by helicopter, three reptile species isolated for millions of years have been discovered:  a strange leaf-tailed gecko, a golden hued skink and a boulder-dwelling frog - ancient animals that have survived in this tiny niche since the Gondwana Rainforest!   



The Blotched Boulder Frog


The 20 cm nocturnal long leaf-tailed gecko emerges at nightfall to hunt on rocks and trees; the shade skink hunts insects in the mossy boulders.  The blotched boulder frog lives in cool, damp cracks of the boulders during the dry season, only emerging during summer rains to breed and feed on insects.


The 20 cm noctural leaf-tailed gecko



“That this gecko was hidden away in a small patch of rainforest on top of Cape Melville is truly remarkable. What makes it even more remarkable is that two other totally new vertebrates were found at the same time,” Dr Hoskin  announced.  He believes the Gecko's long legs are an evolutionary adaptation so the creature can scurry through the unusual, rocky environment looking for prey, while its eyes are likely to help it navigate the deep, dark crevices between boulders.
   

The golden-hued skink hunts for insects between boulders


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Nothofagus, the Southern Beech Forests evolved 100 MYA, during the Dinosaur era when Australia was part of the supercontinent Gondwana.  Between 160 and 65 MYA, Gondwana split apart, forming today's southern hemisphere land masses: Antarctica, South America, Africa, Madagascar, Australia and New Zealand, New Guinea and New Caledonia.   The current distributions of Nothofagus are evidence of the continental drift.  The forests are found only in S. America (Chile and Patagonia), New Zealand, Australia, New Guinea and New Caledonia.
 
 

                                                                 Nothofagus Forest


Monday 28 October 2013

The Wrangel Island World Heritage Site Refugium

According to Gualtieri, L,. Vartanyan, S., et al. (2005)  neither Wrangel Island nor the East Siberianor Chukchi Seas experienced extensive glaciation over the last 64, 000 years.....



Wrangel Island was once a part of Beringia

 Further, Geomorphological reconstruction indicates that Wrangel Island formed Beringia with Chukotka, Alaska and surrounding shelf during the Late Pleistocene, when the global sea level was ca. 100 m below present sea level. Around the Pleistocene-Holocene transition, due to sea level rise, Wrangel Island was separated from the continent  
(becoming a refugium for dwarf woolly mammoth population that became  the last surviving group. S. L. Vartanyan (1995)  and S. L. Vartanyan, (1993)
 

Smaller dwarf mammoth (front)  Wrangel Island

Wrangel and Herald Islands also boast an amazing diversity of flora, insects and birds, representing the greatest refugium of Pleistocene elements of flora and fauna widely spread across ancient Beringia, that were able to migrate along the Bering Land Bridge from Asia - America and back.  Contemporary flora and fauna are a mix of Arctic, Southern, Central Asian andAmericataxons. R. S. Fedyuk (2004)


For some dazzling wildlife images:  http://eng.ostrovwrangelya.org/nature.html
the Russian State Nature Reserve which reports:
 
"The flora of Wrangel Island has no equal in the Arctic for its richness and level of endemism. By the present time 417 species and subspecies of vascular plants have been identified. It is more than on all Canadian Arctic Islands and 2-2,5 times more than on the other Arctic tundra territories of similar size. Among these plants 23 taxons are endemic. Concerning endemic species Wrangel island has no equal including Greenland. A number of endemic plants (Oxytropis ushakovii, Papaver multiradiatum, Papaver chionophilum) are quite common on the island. The number of known mosses (331) and lichens (310) also leaves all the other Arctic tundra territories behind."