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DNA
from fossils reveal origin of Norwegian lemmings
DNA
from fossils reveal origin of Norwegian lemmings
Date:
March 24,
2014
Source:
Expertsvar
Summary:
A new ancient DNA study shows that the Norwegian
lemming has a unique history. In contrast to other mammals in Fennoscandia, the
Norwegian lemming may have survived the last Ice Age in the far north, sealed
off from the rest of the world by gigantic ice sheets.
........................
A new
ancient DNA study shows that the Norwegian lemming has a unique history. In
contrast to other mammals in Fennoscandia, the Norwegian lemming may have
survived the last Ice Age in the far north, sealed off from the rest of the
world by gigantic ice sheets. This conclusion is drawn by an international team
of researchers in an article published this week in the journal Molecular Ecology.
The
Norwegian lemming is an iconic small mammal that is unique to the Fennoscandian
mountain tundra. Known for its dramatic fluctuations in population size, it is
a keystone species in the mountain tundra ecosystem. But its origin has until
now remained somewhat of a mystery.
Twenty
thousand years ago, Fennoscandia was covered by a thick ice sheet. Animals and
plants in the region are therefore thought to originate from populations that
lived to the south or east of the ice sheet, and colonised Fennoscandia as the
ice melted. With this in mind, and international team of scientists, led by
researchers at the Swedish Museum of Natural History, set out to investigate
from where the Norwegian lemming originated at the end of the last Ice Age. To
do this, the researchers retrieved and analysed ancient DNA from lemming
populations that surrounded the ice sheet during the last Ice Age.
- "We
found that even though the populations surrounding the ice sheet were closely
related to modern day lemmings, none of them were similar enough to be the
direct ancestor of the Norwegian lemming," says Love Dalén, Associate
Professor at the Swedish Museum of Natural History.
After
eliminating these populations as potential sources, the researchers concluded
that the only remaining explanation was that the Norwegian lemming originates
from a population that survived the last glaciation somewhere locally in
Fennoscandia. The exact location where the Norwegian lemming could have
survived the last glaciation is not clear, but likely places include coastal
areas or mountain plateaus sticking out from the ice sheet.
"The
Norwegian lemming is the only endemic mammal in Fennoscandia, and its unusual
origin is probably the reason why," says Vendela Lagerholm, lead author on
the study.
Story
Source:
The above
story is based on materials provided by Expertsvar. Note: Materials may be edited
for content and length.
Journal
Reference:
- Vendela K. Lagerholm, Edson Sandoval-Castellanos, Dorothee Ehrich, Natalia I. Abramson, Adam Nadachowski, Daniela C. Kalthoff, Mietje Germonpré, Anders Angerbjörn, John R. Stewart, Love Dalén. On the origin of the Norwegian lemming. Molecular Ecology, 2014; DOI: 10.1111/mec.12698
