Climate change and pollution put in danger tropical zooplankton



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Climate change and pollution put in danger tropical zooplankton

The study: Climate change and oil pollution: A dangerous cocktail for tropical zooplankton, published on the Aquatic toxicology (Amsterdam, Netherlands), explains how the now almost hopelessly compromising pollution is putting biodiversity at risk both in the oceans and on the land.

We can read: "Climate change and oil pollution pose a major threat to tropical marine ecosystems and to the coastal communities relying on their resources. The Gulf of Guinea is severely affected by multiple human induced stressors, but the potential impacts of these on marine productivity remain unknown.

We investigated the combined effects of heatwaves (climate stressor) and the polycyclic aromatic hydrocarbon pyrene (proxy for oil) on the copepod Centropages velificatus. We quantified survival, reproduction and fecal pellet production of females exposed to concentrations of 0, 10, 100 and 100+ nM (saturated) pyrene under simulated heatwaves of different thermal intensity (+3 ° C and +5 ° C above control treatment temperature).

Thermal stress due to both moderate and intensive heatwaves resulted in reduced survival and egg production. negative effects of pyrene were only measurable at the high pyrene concentrations. However, thermal stress increased the sensitivity of C.

velificatu s to pyrene, indicating a synergistic interaction between the two stressors. We document that the interaction of multiple stressors can result in cumulative impacts that are stronger than expected based on single stressor studies.

Further research is urgently needed to evaluate the combined impact of climatic and anthropogenic stressors on the productivity of coastal ecosystems, particularly in the tropical areas."

Can food distributed in French markets contain additives?

Can food distributed in French markets contain additives? The study: Food additives: distribution and co-occurrence in 126,000 food products of the French market, published on the Scientific Reports, tries to answer this question.

In the study we can read: "More than 330 food additives (e.g. artificial sweeteners, emulsifiers, dyes) are authorized in Europe, with a great variability of use across food products. The objective of this study was to investigate the distribution and co-occurrence of food additives in a large-scale database of foods and beverages available on the French market.

The open access crowdsourced Open Food Facts database (https://world.openfoodfacts.org/) was used to retrieve the composition of food and beverage products commonly marketed on the French market (n = 126,556), based on the ingredients list.

Clustering of food additive variables was used in order to determine groups of additives frequently co-occurring in food products. The clusters were confirmed by network analysis, using the eLasso method. Fifty-three-point eight percent of food products contained at least 1 food additive and 11.3% at least 5.

Food categories most likely to contain food additives (in more than 85% of food items) were artificially sweetened beverages, ice creams, industrial sandwiches, biscuits and cakes. The most frequently used food additives were citric acid, lecithins and modified starches (> 10,000 products each).

Some food additives with suspected health effects also pertained to the top 50: sodium nitrite, potassium nitrate, carrageenan, monosodium glutamate, sulfite ammonia caramel, acesulfame K, sucralose, (di / tri / poly) phosphates, mono- and diglycerides of fatty acids , potassium sorbate, cochineal, potassium metabisulphite, sodium alginate, and bixin (> 800 food products each).

We identified 6 clusters of food additives frequently co-occurring in food products. Food additives are widespread in industrial French products and some clusters of additives frequently co-occurring in food products were identified.

These results pave the way to future etiological studies merging composition data to food consumption data to investigate their association with chronic disease risk, in particular potential cocktail effects."