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Is Climate Change Driving the Demise of the Koala?

Photo by Marc Dalmulder | CC BY 2.0

The koala is an engaging, docile, cuddly and lovable animal.  It is also, tragically, undergoing a decline in numbers.  To the extent climate change and a degraded environment are responsible, we can be blamed for not heeding the repeated warnings of scientists and others.

Warnings to humanity are much in the news again as the latest, signed by over 15,000 scientists from 184 countries, appeared in the journal Bioscience not long ago on November 13.  But before, much before, there was an earlier one, now a quarter century past.

The late Henry Kendall was the winner of a Nobel Prize in physics, a founding member of the Union of Concerned Scientists, and the chairman of its governing board.  He spearheaded the effort leading to the 1992 warning signed by 1700 eminent scientists, including then a majority of science Nobel Laureates.  It appealed for the help of the world’s peoples, its scientists, religious, industrial and business leaders.

Earlier still, there was Rachel Carson’s 1962 canary in the coal mine, The Silent Spring, famous for its attack on pesticides like DDT.

While these warnings caution us on the degradation of our planet, there is one area that might be implied but is not specifically mentioned:  the negative impact on the quality of our food.  Noted first by Irakli Loladze, the relatively new discovery was hypothesized in 2002.

In the parts of the world relying on a plant-based diet, people cannot easily compensate for the loss of nutrients.  The proven decline of protein, iron and zinc in grains, potatoes and vegetables will inevitably lead to stunted growth, anemia and more disease.

This distressing and unhappy prospect is not confined to humans.  Bees rely on the goldenrod plant.  It flowers late, and the protein in its pollen is vitally important for them to build themselves up to weather the winter.  Unfortunately, as scientists have learned, the protein content in goldenrod has suffered a drastic loss of about a third as atmospheric CO2 levels have increased.  There may be other causes like pesticides and parasitic mites but lack of nutrition has to be a major candidate.

On the other side of the world lives the harmless Koala bear.  A marsupial, it is truly unique for feeding only on eucalyptus leaves.  Most unusually the female has three vaginas, the outer two leading each to a separate uterus while the center passage is for delivery of its young.  To complement this anatomy, the male is endowed with a double-pronged penis.

Many causes are attributed to the serious drop in koala bear numbers, including habitat destruction, road kills, bush fires and loss of genetic fitness due to inbreeding, but also chlamydia.  This STD has found a fertile field in its complicated genetic apparatus, aided possibly by weakened immunity.  In some places infection rates are as high as 90 percent.  Sadly, the little joeys pick it up suckling in their pouch.  Moreover, the infection can also leave mothers infertile.

Now a new threat has been identified leaving them on the brink.  The koalas source of all nourishment, the eucalyptus tree, has been affected by increasing CO2 levels.  The koalas rely on the mildly toxic leaves for food and water and up to now have been able to tolerate the toxicity — they sleep up to 20 hours to work it out.  But the rise in CO2 has decreased nutrition content leaving them more poisonous.  Feeding on these, the koalas are ingesting ever more poison.  Worse, the Australian drought, blamed on global warming for its intensity, has left the leaves with reduced moisture content.  The stresses have left the koalas dying from kidney failure.

How long before they are added to the ever-increasing endangered list?  Unless the world really sits up and takes notice, we will be soon adding our pollinator bee friends and, eventually, ourselves to that list.  It is what we have in common.

More articles by:

Arshad M. Khan is a former professor who has, over many years, written occasionally for the print and often for online media outlets.

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