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Layers of guano deposits on an Antarctic island have revealed that penguins there were impacted by periodic volcanic eruptions:
For thousands of years, the birds have nested on the Ardley outcrop where their poop, or guano, would collect at the bottom of a lake. But when scientists drilled into these sediments, they got quite a surprise. Interspersed with the layers of penguin waste were thick sections of volcanic ash, indicating the Ardley birds were frequently decimated by eruptions.
"What causes the biggest declines in the penguins is the volcanic activity on nearby Deception Island," explained Stephen Roberts from the British Antarctic Survey (BAS). "Eruptions have gone off at regular intervals over the last 7,000 years. We found there were five phases when the penguin population grew quite significantly, and for three of these the population crashed. This was due to the volcano going off," he told BBC News.
Past penguin colony responses to explosive volcanism on the Antarctic Peninsula (open, DOI: 10.1038/ncomms14914) (DX)
(Score: 2) by bzipitidoo on Thursday April 13 2017, @09:50PM
That's the view from the male perspective. Women are not so eager to have lots of children if circumstances do not look good. Sometimes women have shut down the male drive to overpopulate and reduce through war.
Sure can't do male business as usual any more, not with nuclear bombs in the mix.