There has been a lot of focus on in the media recently about very old trees that are based on radiocarbon dating of a remnant piece of wood in association with a currently living tree and is assumed to have been an ancient stem that reproduced clonally.For example, "Old Tjikko" is a Norway spruce (Picea abies) growing in Sweden.The living stem itself is only a few hundred years old, but there is a radiocarbon age of 9,500 years from dead wood present at its base. Mackenthun instead argues that there is no evidence of genetic continuity between the dead and living wood portions of the tree, nor is there any evidence of clonal origination of Norway spruce in general.The living tree is argued to be only the most recent ramet of the much older individual genet. Thus, in the absence of any solid evidence of genetic continuity between dead and living portions of a species otherwise not known to commonly reproduce clonally, I do not include such trees in data. Brown, Director ● [email protected]● (970) 229-9557 Rocky Mountain Tree-Ring Research ● 2901 Moore Lane ● Fort Collins Colorado ● 80526 USA © Rocky Mountain Tree-Ring Research, Inc.Greenland sharks are considered to be a near-threatened species by the International Union for Conservation of Nature.The species was valued for its liver oil; about 114 litres (30 gallons) of liver oil can be obtained from a large specimen ( fish oil).
They are ovoviviparous (that is, eggs are retained within the body until they hatch) and produce an average of 10 offspring at a time.
(Although the flesh of the Greenland shark may be eaten, it is toxic unless properly cleaned and dried or repeatedly boiled prior to consumption.) Greenland sharks were fished commercially from the 19th century until 1960.
Norway persecuted Greenland sharks during the 1970s, because they were considered to be a nuisance that threatened other fisheries.
A new old age tree record holder was recently recognized, a Pinus longaeva growing in the White Mountains of eastern California.
The date on this tree was reported to me by the late Tom Harlan.