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Gine Roll Skjaervoe at the Norwegian University of Science and Technology's (NTNU) ( http://www.ntnu.edu ) Department of Biology has studied church records from the period 1750-1900 and looked at life history variables: how old were women when they had their first child, and their last? How many years passed between the birth of each child, and how many of these children survived? How many of these children were in turn married and had children?
On average, the lifespan of children born in years that had a great deal of solar activity was 5.2 years shorter than other children. The largest difference was in the probability of dying during the first two years of life.
Children who were born in years with lots of sunshine and who survived were also more likely to have fewer children, who in turn gave birth to fewer children than others. This finding shows that increased UV radiation during years of high solar activity had an effect across generations.
Skjaervoe used information on the number of sunspots as an indication of the amount of UV radiation in a given year. The number of sunspots reaches a maximum every 11 years on average, which results in more UV radiation on Earth during years with high sunspot and solar activity.
UV radiation can have positive effects on human vitamin D levels, but it can also result in a reduction of vitamin B9 (folate). It is known that low folate levels during pregnancy are linked to higher child mortality.
http://www.eurekalert.org/pub_releases/2015-01/nuos-msm010915.php
Also covered by: http://www.sciencedaily.com/releases/2015/01/150109045540.htm
[Paper]: http://rspb.royalsocietypublishing.org/content/282/1801/20142032
(Score: 2) by opinionated_science on Sunday January 11 2015, @07:22PM
I agree. Causation does not follow correlation. Especially from historical data. Mortality was so dreadful only 100 years ago, that it is hard to apply modern understandings of health and welfare. Especially since wihtout modern medicine the only ones left to provide children are the ones that didn't die in the first 15 years of life -still the predominant biological event margin.
There a modern correlation of some power cut 50 years ago in America (I think) that had more births 9 months later. But that is much easier to support as there are before-during-after records.
(Score: 2) by opinionated_science on Sunday January 11 2015, @07:25PM
Oh and an obvious point, more sun might mean more food....
(Score: 2) by cafebabe on Sunday February 01 2015, @02:17AM
In which case, this is circumstantial evidence in favour of the Metabolic Theory Of Ecology [wikipedia.org] previously discussed here [soylentnews.org]. If it is true, the second generation effect could be an artifact of breeding age and sun cycle duration.
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