Radiocarbon dating evidence for mammoths on wrangel island
"It could be that the island was simply too small to support a long-term viable mammoth population," the authors speculated.About 7,600 square kilometres (2,900 square miles) in area, Wrangel Island is a bit smaller than Corsica or Puerto Rico.The researchers also studied sediments and the remains of aquatic animals from freshwater lakes, to work out what was happening to the lakes at the time.Here, equipment for collecting samples of lake sediment is laid out as part of a research project on St. University of Alaska Fairbanks researcher Kyungcheol Choy takes a core sample from a lake on St. Isotope analysis from the Bering Sea island has determined a likely extinction cause for its remnant mammoth population.British, Canadians, Americans and Russians have sent expeditions to the remote arctic region, the first expedition launched by the Russians in 1820.Wrangel Island belongs administratively to the Chukotka Autonomous Okrug of the Russian Federation.The highest mountain on this island is Sovetskaya Mountain with an elevation of 1,096 m (3,600 ft) above mean sea level.
Typically, the mountains are a little over 500 m (1,600 ft) above mean sea level.
Radiocarbon dating shows that at least a few hardy individuals were still hanging on as late as 1700 B. To better understand their demise, researchers led by Anders Angerbjorn of Stockholm University analysed bits of mitochondrial DNA -- genetic material inherited through females -- extracted from bone and tusk.
They reasoned that signs of dwindling genetic diversity would mean that too much inbreeding among a small population could have partially caused the animals to die out.
Wrangel Island is about 125 km (78 mi) wide and 7,600 km² (2,900 sq mi) in area.
It consists of a southern coastal plain that is as wide as 15 km (9.3 mi); a central belt of low-relief mountains; and a northern coastal plain that is as wide as 25 km (16 mi).
Search for radiocarbon dating evidence for mammoths on wrangel island:
The island, which formed between 14,700 and 13,500 years ago, rapidly shrank until 9,000 years ago and continued slowly shrinking until 6,000 years ago.