Climate and Ecosystem Change in the Mediterranean
Since the opening of the Suez Canal in 1869 many hundreds of marine animal and plant species from the Red Sea have invaded the eastern Mediterranean, leading to significant changes in the native flora and fauna of the Mediterranean.
An international team of researchers reported in a recent issue of the international journal Plos One that warming in the Mediterranean caused by climate change could promote the invasion of tiny marine animals called foraminifera.
The foraminifera Pararotalia is a very unimpressive animal at first glance. It is unicellular and very small. Despite this, foraminifera play an important role in the stabilization of ecosystems in the coastal zone. The calcite shells of dead animals form the foundation for many reef ecosystems and have a fundamental importance as so called-ecosystem engineers.
Foraminiferal specialists such as Dr. Christiane Schmidt can identify foraminifera by the shape of their calcite shells. Together with her future MARUM colleagues the geo-ecologist, who will return to Bremen after completing a short-term fellowship in Japan, collected samples of living foraminifera at the Nachscholim National Park, south of Haifa, from the spring of 2012 to autumn 2013.
One object of their search was the newly described Foraminifera Pararotalia, which was first discovered in 1994 in the eastern Mediterranean and has multiplied explosively there since then.
“To date there is no evidence of the occurrence of this species in the Red Sea,” says Dr. Schmidt. MARUM researcher Dr. Raphael Morard, who conducted the molecular identification on this species adds: “With these methods we can show that Pararotalia is indeed an invasive species that originates from the Indian Ocean and the Pacific.”
The success of the genus Pararotalia in the Mediterranean can be attributed to its ecology. This foraminifer lives in symbiosis with tiny microalgae. This symbiosis provides two advantages: foremost, the algae provide food for the Pararotalia through photosynthesis, and this also promotes the growth of the calcite shell of its host.
“Basically it is the temperature regime in the eastern Mediterranean that dictates whether species such as Pararotalia can survive or not,” Dr. Schmidt says. “We have cultured this species in the laboratory and shown that its thermal optimum is around 28°C, but below 20°C and above 35°C it has extreme difficulty surviving.
Next, the team developed a computer model to determine which regions in the eastern Mediterranean are especially well suited for Pararotalia. The model takes into account all occurrence records of this species published to date and, based on the light regime and sea-water turbidity in these locations, both important factors for the survival of the species, models where it is likely to occur now and in the future. The model gives clear results: the coastal ecosystems of Israel and Lebanon are currently the best-suited habitats for this species, but the species currently also lives in Syria and southeastern Turkey.
The model also suggests that in the future Pararotalia will likely expand to areas in the Mediterranean that are still too cold for its survival today. Increasing sea-water temperatures will lead to migration of the species into the western Mediterranean. Co-author Dr. Anna Weinmann, researcher at the University of Bonn says: “Our model clearly shows that by 2100 Pararotalia will likely be found in the Aegean, the Ionic Sea, in Greece, and in Libya due to transport by the prevailing currents.”
Christiane Schmidt, Raphael Morard, Ahuva Almogi-Labin, Anna E. Weinmann, Danna Titelboim, Sigal Abramovich, Michal Kucera
Recent Invasion of the Symbiont-Bearing Foraminifera Pararotalia into the Eastern Mediterranean Facilitated by the Ongoing Warming Trend
In: PLOS One online, 13th August 2015, http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0132917
More information / interview requests / photos:
MARUM Science Communication
Phone ++49 - 421 - 218-65541
MARUM aims at understanding the role of the oceans in the Earth’s system by employing state-of-the-art methods. It examines the significance of the oceans within the framework of global change, quantifies interactions between the marine geosphere and biosphere, and provides information for sustainable use of the ocean.
MARUM comprises the DFG research center and the cluster of excellence "The Ocean in the Earth System".
Albert Gerdes | idw - Informationsdienst Wissenschaft
Novel mechanisms of action discovered for the skin cancer medication Imiquimod
21.10.2016 | Technische Universität München
Second research flight into zero gravity
21.10.2016 | Universität Zürich
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.
Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
21.10.2016 | Health and Medicine
21.10.2016 | Information Technology
21.10.2016 | Materials Sciences