What mackerel and a volcano can tell us about climate change

Researchers assert that bit of history gives clues about what food security could be like in a world that is fast accepting the reality of global warming

January 23, 2017 10:45 pm | Updated 10:45 pm IST - PORTLAND, Maine

Mount Tambora.

Mount Tambora.

What could an Indonesian volcanic eruption, a 200-year-old climate disaster and a surge in the consumption of mackerel tell us about today’s era of global warming? Quite a bit, researchers say.

A group of scientists and academics with the University of Massachusetts and other institutions made that assessment while conducting research about a long-ago calamity in New England that was caused by the eruption of Mount Tambora half a world away in 1815.

A cooled climate led to deaths of livestock and changed fish patterns in New England, leaving many people dependent on the mackerel, an edible fish that was less affected than many animals. The researchers assert that bit of history gives clues about what food security could be like in the modern era of climate change.

“How we respond to these events is going to be critically important for how we come out of this in the long term,” said Karen Alexander, the lead author of the study and a research fellow in environmental conservation. “We can learn from the past how people dealt with the unanticipated.”

The research group’s findings were published this month in the journal Science Advances . They looked at what the catastrophic Tambora eruption meant for the Gulf of Maine and nearby human food systems.

The Tambora eruption was one of the most powerful in recorded history, and was followed by a short time of climate change specifically, global cooling and severe weather. Its impact on weather, food availability and human and animals deaths worldwide has been studied extensively. The year that followed the eruption, 1816, is often described as the “Year Without a Summer.”

The researchers behind the Science Advances article found that alewives, a fish used for everything from fertilizer to food by 19th-Century New Englanders, did not fare well. But mackerel had better survival rates and became a critical source of protein and jobs, Alexander said.

As crops failed and famine began to spread, the little fish emerged as a staff of life, the report states. It’s a scenario similar to what parts of the developing world are experiencing today as climate change affects food security.

The study states there is a parallel between the need for immediate adaptation after Tambora and the challenges in coping with the climate-driven devastation caused by storms, floods and droughts today. It notes that the loss of food staples due to climate change caused people in the northeastern states to move something seen today in places such as Pakistan and Syria.

“Understanding how adaptive responses to extreme events can trigger unintended consequences may advance long-term planning for in an uncertain future,” the report states.

The report illustrates how abrupt changes in climate can have unexpected consequences long after conditions moderate, said Andy Pershing, chief scientific officer and ecosystem modeller for the Gulf of Maine Research Institute in Portland.

“Good stewardship of our natural resources can help buffer against some climate impacts. Unlike the people in 1815, we have an idea of what’s coming, and we need to make sure we are prepared,” he said.

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