How to Build the White Cliffs of Dover

By Tom Evans

The White Cliffs of Dover are one of Britain’s greatest natural wonders. Indeed, the oldest known name for our sceptered isle is Albion—based on the Indo-European root for “white”, an allusion to this majestic landscape. The cliffs, which reach up 110 metres high, are composed of a fine, soft chalk that mostly consists of layers of intricate structures known as coccoliths, thin plates of calcium carbonate.

public domain, no creditThe plates are produced by microscopic photosynthetic algae in the sea known as coccolithophores and these single-celled creatures assemble their plates to form a protective shell, known as a coccosphere. The most abundant of these algae is Emiliania huxleyi, or EHUX. This algae is famous for its ability to bloom: dense populations of the phytoplankton can cover up to 100,000 square kilometers and are easily visible by satellites in orbit as the chalk plates turn the colour of the water a milky white.

Eventually the bloom fades away as the algae gradually die. And remarkably, their cause of death is quite often a virus. We usually think of viruses living in the air or inside our bodies, but in fact the ocean is teeming with viruses – up to as many as 100 billion viruses can be found in just one litre of seawater! EHUX virus 86 infects the algal bloom, and just as quickly as they bloomed, the algae die off. When the algae die, their coccosphere sinks to the seabed. Their boom and bust lifestyle means it gradually accumulates. And if you wait a few million years you end up with the vast and glittering White Cliffs of Dover.

Acid in the face of marine life

By James Forsythe

So the planet is warming up like the 19th century chemist Svante Arrhenius theorised it would, due to an increase in carbon dioxide (CO2) and the resulting greenhouse effect. But the oceans have absorbed approximately half of all human-caused CO2 emissions from the time of Arrhenius onwards, significantly slowing down climate change. This may sound wonderful but what are the effects of that on the ocean environment?

acid

Credit: Mikhail Rogov

Dissolving CO2 in the ocean leads to the formation of carbonic acid. This is predicted to lower the pH of the ocean by about 0.4 units by the end of the century, to levels unexperienced by sea creatures for over 20 million years, and the rate of acidification is already 100 times faster than the last time the oceans acidified 20,000 years ago.

The CO2 will also react with water and carbonate ions to form bicarbonate ions, decreasing carbonate ion availability. This combined with acidification will be bad for organisms with calcareous shells and skeletons including corals, molluscs and plankton, as they will not be able to form such shells or skeletons as easily. Some of these species are economically important, and the knock on effects of any reduction in the numbers of the affected species will doubtlessly change the face of marine life.

If you want to help a mammoth, buy them flowers….

By Charlie Whittaker

Mammoths have been in the news a lot lately, predominantly due to the recent discovery of a particularly well preserved specimen. There was talk of good condition blood being found, perhaps facilitating the extraction of DNA and the generation of new, 21st century edition woollies.

6839068590_0e59292fd1_b

A gift for a discerning mammoth?
Credit Jamiesrabbits

But how did they die out in the first place? Everything from climate change, to comet impact, through to human based overhunting have been bandied as reasons for the loss of the majestic mammoth from the face of the earth. But a new study suggests the answer may be a little more mundane than that.

I am, of course, talking about a grass invasion. Anti-climax I know, but consider this: the primary staple of mammoths and other “megafauna” found in that region of the world at the time were broad leafed, flowering plants called “forbs”. This is a diverse family, including tansies and yarrow, and would have represented a key source of protein for the animals.

This all changed about 10,000 years ago: the composition of the flora inhabiting the Arctic shifted substantially, becoming dominated by grasses.

Past studies have failed to pick up this shift, due to their reliance upon pollen analysis. An exceptionally useful marker of flora presence, fossilised pollen found in permafrost or frozen soil can paint a vivid picture of the diversity and makeup of the vegetation inhabiting a region at a given time. This picture can be skewed however, particularly in the case of grasses, which produce huge amounts of pollen and therefore bias the picture of the landscape painted.

This study looked at plant genetic material found in numerous permafrost samples, as well as analysing the DNA found in the guts of fossilised faeces of 8 animals (4 wooly mammoths, 2 wooly rhinoceroses, 1 bison and a horse) that lived in the Arctic during that period.

All of this showed the forbs to be a stable in the diet of these animals: rich in protein and other nutrients, their continued perseverance in the Arctic landscape is thought to have been essential to continued survival of the animals there.

When these disappeared, 10-15,000 years ago, being replaced with comparatively non-nutritious grasses, the animals there were deprived of a staple foodstuff. This is thought to have massively hastened their extinction.

So, if we do eventually resurrect any woolly mammoths, and you want to be kind, then get on their good side and buy them flowers!

Read the full study here.

The Hidden Costs of Ethanol

By Sophie Harrington

For the last few years, biofuels have been a hot topic in the discussion of alternative fuel sources. The addition of ethanol to fuel, in particular, has helped spur the industry on. In the United States, 3.75 billion gallons of ethanol are required to be blended into petrol supplies.

271337214_29ae2bea1d_o

Credit: Seth Anderson

However, as ethanol began to be added to petrol supplies, significant concerns were raised regarding the effect on corn prices. The initially small size of ethanol production failed to have much of an effect on corn prices as a whole. However, dramatic increases in the industry size have reached the point where ethanol is expected to soon become the predominant use for corn in the U.S., overtaking livestock feed.

The Food and Agriculture Administration (FAO) has claimed that the increasing demand for ethanol has drastically raised the prices of maize worldwide, nearly tripling between 2002 and 2012. In the United States, the Renewable Food Standard has been critical in driving the growth of the biofuels industry, primarily ethanol, by requiring a minimum fraction of petrol to be made up of biofuels. According to some reports, if only 10.6% of global corn production was diverted towards ethanol rather than towards food production, a 68% rise in global corn prices would be expected.

While certain groups have argued that the purported link between ethanol production and rising corn prices is merely a symptom of rising food prices as a whole, significant concerns have been raised regarding the effect of biofuel production on food security across the world.

Debate is currently ongoing in the US regarding the fate of the new Renewable Fuel Standard. Cuts to biofuel requirements are being considered, supported particularly by the oil lobby. Biofuel lobbyists are contending that removing federal support from the industry would only serve to increase reliance on foreign fuel and hurt investment in the industry. The revisions include a cut of between 1.25 and 2.25 billion gallons of the ethanol required to be blended into fuel.

Many have pointed towards second-generation biofuels as the answer to the food conundrum. After all, developing fuel from non-food crops would eliminate the concern that biofuels were driving up prices. Yet research into other sources of biofuels has yet to present alternatives with the same yield and profit margin as ethanol. Whether or not the changes to the Renewable Fuel Standard go into effect could potentially have a dramatic impact not only on the price of corn worldwide, but also on the research funding provided to second-generation biofuels.

For more information, see the Heritage Foundation’s report on the Renewable Fuel Standard.

Prototaxites: Fungal Obelisks or World’s Oldest Carpet?

By Nathan Smith

A long time ago in a galaxy far far aw…..well actually in our galaxy, indeed on our planet, there existed tree-like organisms up to 8.8m tall (that’s approximately 4.5 doors tall or, for a more enjoyable measurement, roughly the size of two T-Rexs standing one on top of the other with the one on top wearing a party hat) and 1.36m wide. Found between 420 and 370 million years ago, its internal structure consisted of tiny intertwining tubes less than 50 micrometres in diameter.

Prototaxites_Dawson1888Prototaxites existed well before the developments of trees; its surrounding environment consisted of mats of moss and liverworts, populated by giant invertebrates, such as an ancient form of scorpion that could reach up to a metre long. The historical views of these structures are that they are the fossilised remains of huge external fungal structures; organic statues standing defiant in an otherwise flat landscape.  There are also suggestions that these giant structures may have had algal symbionts, and therefore should be classified as a lichen. Amongst other things, this suggestion would give good reason for why such structures became ‘extinct’ —this being that they were outcompeted by the emergence of vascular land plants in terms of being able to access the light they required.

But maybe Prototaxites aren’t fungi. Maybe they aren’t even a unique organism. There is an alternative theory; one that suggests that these giant structures weren’t signs of fungal domination but rather the results of an epic battle between nature and itself. Specifically, it suggests that the giant structures are the result of mats of liverworts being pulled up from the ground and rolled up by means of wind, water, or gravity, with algae and fungi possibly being caught up in the mix. Its evidence for this suggestion comes from the similarity in microstructure between fossilised Prototaxites and artificially created liverwort rolls, the paper being published in the American Journal of Botany in 2009.

Whether tree-like fungi or sections of liverwort torn out of the ground, Prototaxites remain a fossilised oddity of a time long since forgotten.

Three in the bed make for a hot relationship

By Nathan Smith

A plant, a fungus, and a virus live together in an environment inhospitable to each partner on their own. This isn’t an absurdist sitcom that’s been written whilst high in the garden, but a genuine biological phenomenon.

The plant, a type of grass known as Panic Grass (Dichanthelium lanuginosum), can grow at temperatures of up to 65C (for a point of comparison, the lethal temperature for humans is about 40C). It is found growing in Yellowstone National Park but only when it has a fungal symbiont Curvularia protuberata and this in turn is ‘infected’ with Curvularia thermal tolerance virus (CThTV).

Yellowstone_Nationalpark3

Too close for comfort? Not for Panic Grass, found near geysers in Yellowstone National Park in the United States

The ecological love-triangle was shown to be necessary for the plant-partner’s survival. This was done by infecting the plant with a ‘cured’ fungus (one that lacks the virus) and comparing it to a plant with both fungus and virus and a plant with no symbionts. The plants were then treated to growing conditions of 65C for 10hrs and 37C for 14hrs. At the end of the treatment, only plants with both partners remained healthy. Furthermore, all plants with both symbionts remained alive whereas the majority of the plants with only the fungus or nothing at all died before the experiment was completed.

However, panic grass isn’t that important or useful to us. It’s not eaten, nor is it cultured to produce fibre or biofuels. So is there any point to this knowledge? Well, the tri-kingdom system can be translated into more economically important crops. It has been shown that the fungal symbiont can colonise the roots of tomato plants and provide protection against higher temperatures, though not to the same extent as is provided to panic grass. It also suggests that the adaption to this system is widespread in nature, as panic grass and tomatoes diverged relatively early in the evolution of plants.

This certainly is hot stuff!

International Seeds of Mystery

By Sophie Harrington

The path to new varieties of hybrid seeds created by companies such as Monsanto and Pioneer is long and expensive. They come from crosses between lines of inbred seeds, each line of which can cost between 30 and 40 million USD and take up to 8 years to develop. These seeds are closely guarded by the companies, with concerns that individuals or other companies might attempt to obtain varieties of inbred seed that they could then cross with a separate inbred, creating their own hybrid line. But until recently international espionage hadn’t been considered.

4673429271_ec1d1d99f5_b

Are spies stealing our seeds? (Credit Tony Fischer Photography)

As reported in the New York Times, various Chinese nationals are suspected of returning inbred rice seeds to crop researchers in mainland China. Mo Hailong is one of the few who has been charged with stealing trade secrets. Mr. Mo was caught in 2011 digging up seeds in a DuPont research farm, from which he fled in true super-spy style in a getaway car. The F.B.I had Mr. Mo under surveillance until his arrest last December.

While the implication of China in a case of so-called “economic espionage” is in and of itself not particularly surprising, the reach into agriculture is unprecedented. But perhaps this, too, is to be expected. Growing middle class populations have resulted in a sharp increase in demand for meat, putting pressure on the supply of corn, often diverted for use as animal feed rather than as food. In the US requirements for ethanol in fuel have also served to drive up the prices of the crop. Obtaining a new line of more virile and fit crops, such as corn, could be crucial in allowing an increase in production.

Yet the strict control that companies such as Monsanto and DuPont have maintained over their proprietary seeds has been a barrier to the easy dissemination of such traits. Corn yields per plant in China haven’t changed significantly in many years, while it’s been over 10 years since the last major Chinese hybrid strain was developed. Stealing the inbred lines developed by American corporations appears to be much quicker and more effective when you aren’t caught. It’s unlikely that this will be the last we hear of agricultural espionage.

More details on the case can be found here