[MARMAM] New paper on Projected amplification of food web bioaccumulation of MeHg and PCBs under climate change in the Northeastern Pacific"

Juan Jose Alava jj_alava at yahoo.com
Tue Sep 11 10:19:46 PDT 2018

Dear colleagues,
I am pleased to announce the publication our new paper on "Projected amplification of food web bioaccumulation of MeHg and PCBs under climate change in the Northeastern Pacific", which was in Scientific Reports. This work is focused on the impact of climate change on pollutant bioaccumulation  and bioamplification (i.e. methyl mercury and PCBs) in the food web of the endangered southern resident killer whales from the Northeastern Pacific.

 Please, see below the abstract and link for open access and attached the original pdf of the publication.
Projected amplification of food web bioaccumulation of MeHg and PCBs under climate change in the Northeastern Pacific
Juan José Alava, Andrés M. Cisneros-Montemayor, U. Rashid Sumaila & William W. L. Cheung  
Scientific Reports, volume 8, Article number: 13460 (2018)
Climate change increases exposure and bioaccumulation of pollutants in marine organisms, posing substantial ecophysiological and ecotoxicological risks. Here, we applied a trophodynamic ecosystem model to examine the bioaccumulation of organic mercury (MeHg) and polychlorinated biphenyls (PCBs) in a Northeastern Pacific marine food web under climate change. We found largely heterogeneous sensitivity in climate-pollution impacts between chemicals and trophic groups. Concentration of MeHg and PCBs in top predators, including resident killer whales, is projected to be amplified by 8 and 3%, respectively, by 2100 under a high carbon emission scenario (Representative Concentration Pathway 8.5) relative to a no-climate change control scenario. However, the level of amplification increases with higher carbon emission scenario for MeHg, but decreases for PCBs. Such idiosyncratic responses are shaped by the differences in bioaccumulation pathways between MeHg and PCBs, and the modifications of food web dynamics between different levels of climate change. Climate-induced pollutant amplification in mid-trophic level predators (Chinook salmon) are projected to be higher (~10%) than killer whales. Overall, the predicted trophic magnification factor is ten-fold higher in MeHg than in PCBs under high CO2 emissions. This contribution highlights the importance of understanding the interactions with anthropogenic organic pollutants in assessing climate risks on marine ecosystems.

A media release on this work was also posted today at the website of the Institute for the Oceans and Fisheries, University of British Columbia

Also, this article (the modeling paper) should be a follow up for the review paper aforementioned on "Climate change–contaminant interactions in marine food webs: Toward a conceptual framework" published last year (https://onlinelibrary.wiley.com/doi/full/10.1111/gcb.13667)and the story about it posted in: http://oceans.ubc.ca/2017/04/27/apex-marine-predators-affected-by-human-made-pollutants-and-climate-change/. Please, feel free to distribute this article throughout your networks.
Best Wishes!!!
Juan Jose Alava

Juan Jose Alava, PhD  Adjunct Professor
Resource and Environmental Management, Faculty of Environment, 
Simon Fraser University
8888 University Drive, 
Burnaby, British Columbia V5A 1S6,Canada
E-mail: jalavasa at sfu.ca 

Juan Jose Alava
Research Associate (Honorary), Nippon Foundation- Nereus Program
Institute for the Oceans and Fisheries
Faculty of Science, The University of British Columbia
AERL 313.02-2202 Main Mall | Vancouver, BC V6T 1Z4 Canada
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