Effects of consecutive heat waves on the resistance, resilience and recovery of marine plankton communities (Heat Waves)

Marine systems are facing an increase in the frequency of extreme events and especially climate change scenarios foreshadow the increase of heat waves in the future. Increasing heat waves can alter planktonic diversity, interactions between different groups, and key processes. According to modelling forecasts for the future increase in the frequency of heat waves, an in situ mesocosm experiment is currently being conducted (end of April and May 2022) at the CNRS-MEDIMER infrastructure (city of S… Read more »

A Brownification experiment in Crete, Greece

In June 2021, an international mesocosm experiment (Codenamed “BrownMed”) took place at the CretaCosmos mesocosm facility of the Hellenic Centre for Marine Research in Crete, Greece. The BrownMed experiment was part of the Joint Mesocosm Experiment (JOMEX) organised by the H2020 AQUACOSM project. In this experiment, the brownification of the various aquatic ecosystems was studied. And when we say various, we mean various! From lakes in Central Europe to estuaries and coastal marine systems in th… Read more »

Long-term lake warming experiment meets short-term heatwave

In the summer of 2021, in a respite from the restrictions of the pandemic, the team at the Aarhus University Lake Warming Mesocosm Experiment (LWME) managed to run a heatwave experiment with support from the EU H2020 project AQUACOSM-plus. The LWME has been running at the department of Ecoscience at Aarhus University since late 2013. The experiment was part of the AQUACOSM project and is now part of the AQUACOSM-plus network. It is also contributing data to a number of other national and interna… Read more »

Do you need a low-cost, low-weight, and easily-transportable mesocosm platform?

In AQUACOSM-plus, we develop one… Many systems for mooring mesocosms are very rigid, immobile and/or usually very expensive. This limits the capacity to investigate ecological and socio-economical impacts on various aquatic systems on regional to international scales, especially if mesocosm infrastructures are not available at these sites. Hence, it is important to develop a flexible and cost-effective system for mobile use in different locations, in a way to allow testing a wide range of ecol… Read more »

Comparative double-mesocosm carbon experiment throughout the sub-arctic winter, Umeå, 18 Feb 2022

After the last snow fall, several decimetres of snow now cover the 40 cm thick ice at the northern Baltic Sea mesocosm site. Nine of the new AQUACOSM mesocosm units, developed during the previous AQUACOSM-project and frozen into the ice, are compared with the indoor mesocosm system at the Umeå Marine Sciences Centre, Umeå University. Ice cover can also be formed in the indoor system. Since the end of November last year, both systems have been amended with carbon in the form of HuminFeed and a so… Read more »

Effect of decreasing inorganic N:P ratio on the plankton community – INN:PP

Our mesocosm experiment is aimed at understanding the effect of the decreasing inorganic N:P ratio on the plankton community of the Baltic Sea. It was held for three weeks, from 5th until 23rd of June 2021, at the facility of Tvärminne Zoological Station of the University of Helsinki (Finland). The core group. Standing from left: Cristian Villena-Alemany (Institute of Microbiology, Centre ALGATECH, Czech Academy of Sciences), Mari Vanharanta (SYKE: Finnish Environment Institute), Kasia Piwosz (N… Read more »

Should we bother about a less salty sea? A mesocosm experiment on the impact of salinity change on the plankton food web in the Gulf of Finland

The Baltic Sea is the largest brackish sea in the world and its salinity is predicted to fall over the next 100 years due to climate change causing increased rainfall and ice melt in Northern Europe. Declining salinity levels present a risk for marine associated species (which are sensitive to changes in salinity) and a potential gain for others who prefer less salty environments. Boat Paliju, with mesocosm. Photo by Clio Hall. The team at the Tvärminne Zoological Station in Finland set up an ou… Read more »

KOSMOS-Gran Canaria 2021 – First mesocosm experiment to study the potential risks and co-benefits of ocean alkalinity enhancement in a pelagic ecosystem

A drastic reduction in greenhouse gas emissions alone will not be sufficient to limit warming to well below 2°C, as pledged in the Paris Climate Agreement. In addition, a substantial amount of CO2 will have to be actively removed from the atmosphere. But how do we best develop our CO2-removal capacity? A wide range of both technical and nature-based approaches are being proposed, tested and compared. Whilst terrestrial resources are already utilised intensively by competing societal sectors, the… Read more »

Call for Transnational Access to European Aquatic Mesocosm Facilities in 2022

The EU Research Infrastructure project AQUACOSM-plus has opened the second call for Transnational Access (TA) to more than 60 aquatic mesocosm facilities throughout Europe in 2022. AQUACOSM-plus provides funding to academic and industrial (including SMEs) research groups, individual scientists, experts, professionals and university students from all over the world (up to 20% non-Europeans and associated countries) to: participate in mesocosm experiments that have been planned by the facility pro… Read more »

Who ate the Phytoplankton? A mesocosm experiment at LMU/SLS about the impact of major zooplankton grazer groups on phytoplankton

Ziga Ogorelec preparing mesocosm bags This year we could again offer Transnational Access (TA) in the framework of AQUACOSMplus at LMU/SLS. Among the TA users were group leaders and trainees from different countries, including France, Italy and Slovenia. Dr. Ziga Ogorelec from Slovenia, however, was not only a TA user at SLS with his very interesting project; with his experiment we could successfully test our light weight mobile mesocosm system at the same time. The aim of Zigas’s study was to d… Read more »