13 May '12, 3pm

History of a giant salamander (Dicamptodon tenebrosus)

History of a giant salamander (Dicamptodon tenebrosus)

Dicamptodon tenebrosus; Credit: Jeffrey Marsten Multiple influences on the population genetics of a salamander in the American north-west have been uncovered by the Rachael Y. Dudaniec, Stephen F. Spear, John S. Richardson, and Andrew Storfer of the Universities of British Columbia and Washington State. The value of this work is that knowledge of current landscape patterns can now more accurately be used in the conservation of many species. In the case of this, the coastal giant salamander Dicamptodon tenebrosus , a northern population in Canada was founded by many fewer individuals than the southern group which is centred in Washington state, in the US. The history of glaciation in this area is documented as influencing many of the salamanders. During the early to mid-Pleistocene, between 1.7million to 800,000 years ago, just over 30,000 individuals of this particular spe...

Full article: http://www.earthtimes.org/scitech/giant-salamander/1982/

Tweets

Using find_each for the first time to export a ...

api.rubyonrails.org 21 May '12, 10am

Yields each record that was found by the find options . The find is performed by #find_in_batches with a batch size of 100...

Giant snake and giant turtle were besties

Giant snake and giant turtle were besties

grist.org 18 May '12, 3pm

You couldn’t have a one-ton snake today — the climate’s just too moderate for a cold-blooded creature that size. But back ...

Armed Forces Day History

defense.gov 19 May '12, 2pm

The theme of the first Armed Forces Day was "Teamed for Defense." It was chosen as a means of expressing the unification o...