News

Published on November 5, 2015

Between November 2nd and December 7th, our postdoctoral researcher Gert Everaert performs a research stay at the Norwegian Institute for Water Research (NIVA). The Niva is a non-profit research foundation which researches, monitors and assesses freshwater, coastal and marine environments and environmental technology. Gert will collaborate closely with the scientific staff of the section ‘Contaminants in the aquatic environment’. The research stay is supported by a travel grant of the ‘Fonds voor wetenschappelijk onderzoek  (FWO)’.

Published on September 15, 2015

The chronic toxicity of Ni is strongly dependent on the physico-chemistry of freshwater environments. Metal bioavailability models predict metal toxicity in receiving waters by taking into account the effects of pH and the formation of (in)organic ligand on metal bioavailability and the effects of cations, such as Ca & Mg, on metal uptake. Currently, the Environmental Quality Standard (EQS) for Ni in the Water Framework Directive (WFD) is bioavailability based. Although some of the available chronic Ni bioavailability models are only validated for pH up to 8.2, a considerable fraction of the European surface waters has a pH above 8.2. Therefore, we investigated the effect of a change in pH from 8.2 to 8.7 on chronic Ni toxicity to 3 invertebrate and 2 plant species. Next, we investigated whether the existing chronic Ni bioavailability models could be used to predict chronic Ni toxicity above pH 8.2.

Published on September 9, 2015

As the human population continues to expand, scientists and politicians are faced with a simple question: will we be able to feed ourselves in the future? Many of our food sources are at peak productivity and only in a few sectors, such as the aquaculture industry, is significant growth feasible. However, these sectors are also faced with global concerns like climate change. The rise of sea surface temperature will affect marine ecosystems in drastic ways. Among others, pathogens and harmful algae are expected to benefit from a warmer environment. As a result, both wild and cultured bivalves will become more frequently exposed to these stressors.

Published on August 10, 2015

At the moment, 2 GhenToxLab members are joining the 100th ESA conference in Baltimore, USA (August 9-11). With over 250 contributed talks and poster sessions, this is the biggest ecological conference worldwide. Today, filling the gap between ecology and toxicology is one of the main research themes in our lab. As such, Jonathan De Raedt and Jan Baert present their poster “The effect of dispersal along a stress gradient in micro-algae communities”.

Published on July 17, 2015
For the Marine Environmental Research Special Issue on “Particles in Oceans”, we contributed with a comprehensive review on microplastics in sediments. For this review we analysed literature dating back to the 1970s, in order to gain insights in the worldwide occurrence of microplastics in sediments, processes that drive their distribution and effects of this type of pollution on sediment associated organisms. Based on this extensive literature review (over 120 publications), we were able to identify several shortcomings in microplastics research and formulate recommendations to deal with these issues in the future. Although important advances have been made in the past decade, we describe the need for standardisation and harmonisation of sampling and extraction techniques, and the need for more realistic effect assessments for microplastics.
 

Published on July 3, 2015

There is growing evidence that pollution has consequences that can extend beyond exposed generations and may involve trans-generational responses as well as rapid micro-evolutionary processes. A recent testimony of microevolution in fish of the Elizabeth River in Virginia, a water body so polluted that it has been termed a "toxic hot spot", reported costs of adaptation to this polluted environment. These fish displayed lower survival in clean water and appeared more sensitive to additional stressors. Most ecotoxicological test guidelines are only considering effects within one generation, thus potential detrimental effects across generations are under-evaluated. Here we conducted a natural selection experiment over several generations with a natural Daphnia magna population.

Published on July 3, 2015

Over the past years, GhEnToxLab has developed an active and fascinating collaboration with the UGhent’s X-ray Microspectroscopy and Imaging Group (XMI). This lab, led by Prof. dr. Laszlo Vincze, is specialized in the development of synchotron radiation-based tools for micro X-ray imaging, absorption spectroscopy and fluorescence analysis. Among other techniques, they are currently developing a method that uses lasers to trap and manipulate single celled organisms in their native environment. The optically trapped organism can then be subjected to micro X-ray fluorescence imaging, providing us with a radically new tool to map the subcellular elemental composition of these cells.

Published on July 1, 2015

Through global shipping and trade, mankind has inadvertently spread marine organisms to such an extent that many are now considered cosmopolitan. Further aggravated by changes in the foodweb structure (overfishing), eutrophication and climate change, this has led to a substantial increase in the occurrence of harmful algal blooms (HABs). Next to the large potential for environmental damage, these recurring events have become a global public health concern as many species produce potent marine toxins that may lead to shellfish poisoning. To ensure food safety, the mouse bioassay has long been used to screen seafood for the presence of these toxins. Due to ethical concerns, however, this test is now being replaced by alternative chemical analyses.

Published on June 15, 2015

javascript:void(0)Since 2009, the Belgian Science Policy Office (BELSPO) has coordinated and facilitated the scientific diving activities of Belgian scientists. Every year, a BELSPO working group organizes a ten-day course to train and prepare Belgian marine scientists. GhEnToxLab member, Maarten De Rijcke, has been selected as one out of only eight divers to be trained as a Belgian Scientific Diver this year. Congrats Maarten, enjoy and keep it safe!

Published on May 29, 2015

Research collaborator and former postdoc visiting researcher Takashi Nagai is selected as a new member of the Scientific Advisory Committee regarding environmental risk assessments. The committee consists of 21 scientists and conducts scientific considerations on official environmental risk assessments of industrial chemicals. It falls under the Japanse Chemical Substances Control Act which resembles the REACH regulation of the European Chemicals Agency (ECHA).

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