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Mosquito threat to giant tortoise Mosquito threat to giant tortoise
(1 day later)
The famous Galapagos giant tortoises could be at serious risk from mosquitoes that have developed a taste for reptile blood, experts have warned.The famous Galapagos giant tortoises could be at serious risk from mosquitoes that have developed a taste for reptile blood, experts have warned.
Scientists say increased tourism means there is now a greater risk of a disease-carrying insect being transported to the islands.Scientists say increased tourism means there is now a greater risk of a disease-carrying insect being transported to the islands.
Local mosquitoes that have evolved to feed on reptiles could then pick up the diseases and pass them on.Local mosquitoes that have evolved to feed on reptiles could then pick up the diseases and pass them on.
Galapagos wildlife has little immunity to mosquitoes due to their isolation.Galapagos wildlife has little immunity to mosquitoes due to their isolation.
The study was published in the US journal Proceedings of the National Academy of Sciences.The study was published in the US journal Proceedings of the National Academy of Sciences.
'Looking for blood' FROM BBC WORLD SERVICE class="" href="http://bbc.co.uk/worldservice/index.shtml">More from BBC World Service
The world's largest living tortoises are an icon of evolution, growing so large on the isolated islands because of the absence of natural predators.The world's largest living tortoises are an icon of evolution, growing so large on the isolated islands because of the absence of natural predators.
But recent observations by scientists suggest that it is the evolution of mosquitoes that could now pose a very real threat to island wildlife.But recent observations by scientists suggest that it is the evolution of mosquitoes that could now pose a very real threat to island wildlife.
On the mainland of South America, the insects prefer to bite mammals but they have adapted their behaviour to favour reptile blood on the Galapagos.On the mainland of South America, the insects prefer to bite mammals but they have adapted their behaviour to favour reptile blood on the Galapagos.
Increasing tourism means there is now a concern about the arrival of infected mosquitoes carrying diseases like avian malaria and West Nile fever, against which giant tortoises and marine iguanas have no immunity.Increasing tourism means there is now a concern about the arrival of infected mosquitoes carrying diseases like avian malaria and West Nile fever, against which giant tortoises and marine iguanas have no immunity.
Mosquitoes arrived 200,000 years ago and evolved to feed on reptilesMosquitoes arrived 200,000 years ago and evolved to feed on reptiles
Arnaud Bataille from the University of Leeds in the UK carried out the research.Arnaud Bataille from the University of Leeds in the UK carried out the research.
He said that mosquitoes arrived on the Galapagos 200,000 years ago and were not introduced by humans as previously thought.He said that mosquitoes arrived on the Galapagos 200,000 years ago and were not introduced by humans as previously thought.
But he said when the mosquitoes first arrived on the islands, the only mammals were sea lions.But he said when the mosquitoes first arrived on the islands, the only mammals were sea lions.
"It [the mosquito] was looking for some blood. What it was going to find is these huge reptiles and marine iguanas, so I think it gave it a go and liked it a lot," he said."It [the mosquito] was looking for some blood. What it was going to find is these huge reptiles and marine iguanas, so I think it gave it a go and liked it a lot," he said.
In an effort to cut the risk of mosquitoes and other insects being transported to the islands, the Ecuadorian government now require planes flying to the Galapagos to be sprayed with insecticide.In an effort to cut the risk of mosquitoes and other insects being transported to the islands, the Ecuadorian government now require planes flying to the Galapagos to be sprayed with insecticide.
Similar measures have yet to be introduced on ships.Similar measures have yet to be introduced on ships.