Coral reefs are known for their rich biological diversity. In Sweden, only one reef-building coral species exists, a cold-water coral called Lophelia pertusa.
Lophelia pertusa requires an environment with a constant high level of salinity and low water temperatures all year round. In Sweden, these conditions only exist in the northern part of Bohuslän, where deep water from the Atlantic is led in via the Norwegian Trench.
“We’ve known since the mid-1920s that cold-water coral reefs exist here in Sweden,” says marine biologist and researcher Mikael Dahl. “At that time, corals could be found in three locations in the Koster Fjord. Today, only the Säcken reef remains, and it’s in poor condition.”
Some of the causes to this are the impact of trawling and increased sedimentation from eutrophication. Continuous observations with remotely operated vehicles (ROV:s) shows that the health of the reef slowly continues to decline.
“The red list assessment is currently in the ‘under immediate threat’ category. The Säcken reef has been protected against trawling for more than a decade, but trawling damage have been observed on the reef several times after the legislation was set in place”, says Mikael Dahl.Three years ago, the protection of the reef was further strengthened when Sweden’s first national marine park, the Kosterhavet National Park, was created. However, the Säcken reef remains in poor condition.
Coral reefs are entirely dependent on larvae from other reefs in order to recover naturally after they have been damaged, and the researchers have for a long period of time set their hopes to larvae from the nearby coral reefs in Norwegian waters. However, a study recently published in the research journal Coral Reefs, shows that the Säcken reef is isolated from the other reefs in the northeast Skagerrak.
By using genetic markers, researchers have estimated the degree of gene flow between the reefs in Skagerrak. The results show that the genetic distance between the Säcken reef and four other reefs in the northeast Skagerrak is one of the largest on both sides of the Atlantic. The genetic diversity on the Säcken reef is also much lower than observed in any other reef of this type.
“This means that it is highly unlikely that the Säcken reef will recover naturally,” says Mikael Dahl, who led the study. “Instead, interventions are needed in order to ensure the survival of the reef.”
On the basis of these results, researchers from the University of Gothenburg have started a restoration project where healthy corals from nearby reefs in Norway are being removed and placed on the Säcken reef after being genetically characterised. The researchers hope that these corals will survive the process of being transferred, and that they will be able to help with the re-establishment of the reef, through both asexual and sexual reproduction.
The Säcken reef is spread across an area of 5,000 m², but today there is only living coral in an area of around 300-500 m². Further results from the study show that individual specimens of Lophelia pertusa corals may be several thousands of years old, and in the Norwegian coral reef some of the individuals have been estimated to be somewhat 6,200 years old. But many are probably older.
“In other words, it’s not only the reefs themselves that are extremely old, but it’s also actually the same individuals that have been situated there since soon after the withdrawal of the inland ice. These individual corals have been living there in the deep darkness since long before the Pharaohs built the pyramids”, says Mikael Dahl.Link to the article:
Helena Aaberg | idw
Bioinvasion on the rise
15.02.2017 | Universität Konstanz
Litter Levels in the Depths of the Arctic are On the Rise
10.02.2017 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport
Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...
The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...
Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...
Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".
Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...
13.02.2017 | Event News
10.02.2017 | Event News
09.02.2017 | Event News
17.02.2017 | Medical Engineering
17.02.2017 | Medical Engineering
17.02.2017 | Health and Medicine