Tiny foraminifera in oceans can save islands, study finds

Profiting from climate change
Starsand Foraminifera from the Great Barrier Reef (Australia): Researchers from the University of Bonn found out that such tiny foraminifera in the oceans can save islands. Credit: Martin Langer/Uni Bonn

The climate is getting warmer, and sea levels are rising – a threat to island nations. As a group of researchers lead by colleagues from the University of Bonn found out, at the same time, tiny single-cell organisms are spreading rapidly through the world's oceans, where they might be able to mitigate the consequences of climate change. Foraminifera of the variety Amphistegina are stabilizing coastlines and reefs with their calcareous shells. The study's results have now appeared in the international online journal PLOS ONE.

Countless billions of tiny, microscopic shelled creatures known as foraminifera inhabit the oceans of our planet: some of which look like little stars, others like Swiss cheese, and yet others like tiny mussels. They are extremely plentiful and exceptionally diverse in shape. Most of the approximately 10,000 foraminifera species live on the bottom of tropical and sub-tropical oceans, are surrounded by a calcareous shell, and do not even reach the size of a grain of sand. And yet, these tiny organisms are capable of enormous tasks. "Foraminifera are ecosystem engineers," says Prof. Dr. Martin Langer from the Steinmann-Institut für Geologie, Mineralogie und Paläontologie at the University of Bonn. "With their shells, these protozoa produce up to two kilograms of per square meter of ocean floor. This often makes them, after corals, the most important producers of sediment in tropical reef areas."

About 9,000 kilometers along the coast

Together with their colleagues from the Zoologisches Forschungsmuseum Alexander Koenig, the University of Trier and the Woods Hole Oceanographic Institution (USA), the scientists from the University of Bonn studied the range of Amphisteginid foraminifera. Amphisteginids are among the most conspicuous and ubiquitous foraminifera on and tropical carbonate environments and often have been referred to as living sands. Over the past years, Prof. Langer has been capturing the range in which Amphisteginids occur along the about 9,000 kilometer-long coastline off Somalia, Kenya, Tanzania, Mozambique, South Africa, Namibia, and Angola. "The range of Amphistegina is essentially governed by ocean temperature and nutrient content of the waters," the micro-paleontologist explains. So, for example, these protozoa need a water temperature of at least 14 degrees Celsius.

By 2100, the protozoa will have spread almost 300 kilometers closer to the poles

Using the data from biogeographic terrain analyses, the researchers developed a species distribution model for calculating where Amphisteginid foraminifera occur under certain environmental conditions. Based on climate models, the researchers then forecast the future range of these calcareous shell protozoa. "Amphistegina are among those profiting from the rising temperatures as a result of climate change," summarizes Prof. Langer. According to the models, the calcareous protozoa will spread 180 km (or 1.6 degrees of latitude) closer to the poles through the warming oceans by 2050. By 2100, average ocean temperatures will increase by about 2.5 degrees Celsius according to conservative estimates. Accordingly, Amphisteginid foraminifera will progress another almost 300 kilometers – about 2.5 degrees of latitude – closer to the poles.

Ocean acidification - survival of the fittest

"Our models are forecasting rates of spread of up to eight kilometers per year," says doctoral student Anna Weinmann from the Steinmann-Institut at the University of Bonn. Corals can spread into new territories at similarly high rates. They do, however, have problems with the acidification of the oceans that accompanies the increasing carbon dioxide rate in the atmosphere. The skeletons of corals consist of aragonite and are thus much more sensitive to acids than the fora-minifera's calcite shell. "Amphisteginids and other foraminifera are increasingly taking over calcium carbonate production from corals, thus occupying their ecological niche. This is a role reversal in process," reports Prof. Langer.

Calcium carbonate producers are stabilizing the coastlines and reefs

The rapid range extension and proliferation of amphisteginid and other tropical foraminifera will characterize tropical ocean floors of the future. There also is abundant evidence from the past to support this hypothesis; especially since these calcite protozoa have been inhabiting the oceans for about 600 million years already. "The fossil record shows that whenever during the history of Earth the carbon dioxide content of the atmosphere was considerably higher and the oceans were clearly warmer, foraminifera were among the most frequently occurring carbonate producers in tropical oceans," says the micropaleontologist. The capability to rapidly expand their biogeographic territory under changing climate conditions, and their prolific production of calcium carbonate, will make them key ecosystem engineers for the stabilization of reefs, beaches and islands. Island nations are already pointing to the rising ocean levels and increasing damage to their coasts today. Prof. Langer, "Amphisteginids and other foraminifera will rapidly spread in the decades to come and will contribute substantially to future tropical reef island resilience."

Explore further

Ocean acidification could have broad effects on marine ecosystems

More information: Climate-Driven Range Extension of Amphistegina (Protista, Foraminiferida): Models of Current and Predicted Future Ranges, PLOS ONE, DOI: 10.1371/journal.pone.0054443
Journal information: PLoS ONE

Provided by University of Bonn
Citation: Tiny foraminifera in oceans can save islands, study finds (2013, February 6) retrieved 13 October 2019 from https://phys.org/news/2013-02-tiny-foraminifera-oceans-islands.html
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Feb 06, 2013
From these studies I don't think we need to worry about rising Co2.http://www.co2sci...fera.php

Feb 06, 2013
The issue I see is that oceanic acidification could make this all a moot point. As the Ocean becomes more acidic it passes a threshold where the Calcium Carbonate shells can't form. In fact at a certain level of acidity the calcium carbonate actually starts dissolving.

If these shells are the stabilisers for island I am worried what will happen when the higher ocean acidity starts dissolving them.

Feb 06, 2013
Why are you still posting nonsense from the Idso family Gregor?

You have been repeatedly told that they are congenital liars in the employ of Western Fuels, and have been shown how in composing that "mideeval warming graphic" that they cherry picked unrelated graphs an used temperatures rises at different times to make it appear as if those temperature rises occurred at the same time.

In reality the Idso graph showed temperature rises that spanned over 1,000 years.

Articles contradicting the Idso nonsense we have.

Atmospheric pCO2 since 60 Ma from records of seawater pH, calcium, and primary carbonate mineralogy


Seawater pH and isotopic paleotemperatures of Cretaceous oceans

And dozens upon dozens of others that weren't cherry picked by the Idso's.


Feb 06, 2013

From the last reference we find the following graphic showing measured ocean PH levels in line with IPCC estimates, and which the Idso's claim were not possible.


So this is the third time the Idso's have been caught misrepresenting the facts in order to get a paycheck from Western Fuels.

Will Gregor continue to use their nonsense as a source of his nonsense?

Or is Gregor going to start conducting himself in a honest manner?

Feb 07, 2013
@VendicarE - Gregor just wants to be right about something and wont let pesky facts stand in the way of getting there. I think there is actually a designation for it in the DSM Narcissistic Personality Disorders section. Arguing with him is like getting into a debate with someone with a severe learning disability.

I do believe that the CO2 fertiliser effect is there, but it is so limited that it will do little to slow down climate change. Focusing on it is akin to staring at a pretty flower in the middle of the train tracks while a locomotive bears down on you. It is pretty, but you still die.

I am a bit surprised that this article didn't talk about the negative effect of ocean acidification on these life forms. They may be beneficial in more normal circumstances, but the acidification of the ocean could render them useless. Worse yet, they could actually be very important for holding things together and the acidification of the ocean could cause them to dissolve.

Feb 07, 2013
The Foraminifera evolved more than 500 million years ago when CO2 levels were over 2,000 ppm. We are at around 380 ppm now. We have a way to go yet before we need to worry. The oceans are nowhere near becoming acid.

Feb 07, 2013
And as we all know, there has neen no evolutionary change over those 500 million years.

"The Foraminifera evolved more than 500 million years ago " - GregorTard

GregorTard will never grow up and be a scientist. Hs spend far too much time lying to himself as well as others.

Feb 07, 2013
What happened to VendicarD ?

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