Top Tweets for #ContSesh2
Very nice and interesting presentation @Albert_CelineC πππ§βοΈ
@LIENSsCNRSULR @ARCTOX_
#WSTC7 #ContSesh2
A fantastic plenary to kick off day 3 of #WSTC7! Make sure you check out the full thread, and get in touch with @AkikoShoji if youβre interested in #mercury contamination of #marine predators in the Pacific β¬οΈ #ContSesh2
11/11. #WSTC7 #ContSesh2 We are currently developing a project to create a database for mercury levels of marine predators (i.e. #seabirds, #fish, #mammals) in the Pacific Ocean. Please contact me if you are interested!
4/4 #WSTC7 #ContSesh2 Probability of laying an egg that fails hatching is negatively related to [DDE & PCBs] in blood | DDTs found in 2019 was considerably < than 50 years ago | Can the Cahow be particularly vulnerable to sublethal effects from exposure to [POPs]?
![rosaa_martins's tweet photo. 4/4 #WSTC7 #ContSesh2 Probability of laying an egg that fails hatching is negatively related to [DDE & PCBs] in blood | DDTs found in 2019 was considerably < than 50 years ago | Can the Cahow be particularly vulnerable to sublethal effects from exposure to [POPs]? https://t.co/dWudLbRCwo](https://pbs.twimg.com/media/E0pCUYqXMAIK9pl.jpg)
3/4 #WSTC7 #ContSesh2 Cahow EGG failure rate varies between 27-39% (2006-2019). PCBs & DDE were found in 100% of the sampled birds. Among analyzed POPs, PCBs were the most diffuse although at low concentration. @letiziacampion1 @Nonsuch_Bermuda #seabirds #TeamPetrel
2/4 #WSTC7 #ContSesh2 This study took place in #Bermuda, where there are only 142 Cahow breeding pairs (2020) | We sampled a small volume of blood to analyze exposure to 3 families of POPs (Tot 40 compounds) and recorded egg hatching success| @cahowman @Nonsuch_Bermuda
1/4 #WSTC7 #ContSesh2 Today Iβll be presenting our work investigated if the exposure of the endangered Bermuda petrel (Cahow) to persistent organic pollutants (POPs) is linked to the probability of laying unsuccessful eggs @cahowman @letiziacampion1 @JosePGranadeiro #TeamPetrel
11/11. #WSTC7 #ContSesh2 We are currently developing a project to create a database for mercury levels of marine predators (i.e. #seabirds, #fish, #mammals) in the Pacific Ocean. Please contact me if you are interested!
10/11. #WSTC7 #ContSesh2 To conclude, combining movement and chemical markers of marine predators can help monitoring global mercury levels.
Here, some challenges and opportunities in my view.
9/11. A possible key factor in this context is carry-over effects, which can affect wintering distribution (right), breeding phenology & #behaviour (left), & diet, all of which may affect mercury levels in #seabirds. We aim to study this in future. #WSTC7 #ContSesh2
8/11. #WSTC7 #ContSesh2 While mercury levels in environment & seabird tissues are correlated, spatial distribution of mercury, species (ecology) & other factors likely affect #seabirds mercury levels. So we need a standardised method for using #seabirds as mercury indicators.
7/11. Levels of mercury in auk feathers in both the Pacific and Atlantic Oceans were within reported values, but above thresholds for adverse effects. #WSTC7 #ContSesh2
6/11. #WSTC7 #ContSesh2 We further expanded this research, by C. Nakajima, to look at the spatial distribution of mercury in 3 auks species (Tufted #puffins, Rhinoceros auklets, Atlantic puffins), in collaboration with @ArcticEcology, @AnnetteFayet, @killerwhelan & many others.
5/11. More details in our new paper https://t.co/PhGRD6KQxz.
This further supports the idea of using #seabirds as marine mercury indicators. #WSTC7 #ContSesh2
Thanks @ArcticEcology, @killerwhelan and many others taking part in this work.
4/11. We found that mercury concentrations in #seabird tissues reflected those in the environment, as shown in this figure. This suggests #seabirds can transport mercury over long distances and deposit it in terrestrial ecosystems. #WSTC7 #ContSesh2
3/11. We investigated mercury transfer pathway from mercury measurements (1) in the breeding & non-breeding local marine environment (as a potential source), (2) in plants at the colonies, and (3) in bird tissues reflecting different exposure times/locations. #WSTC7 #ContSesh2
3/11. We investigated mercury transfer pathway from mercury measurements (1) in the breeding & non-breeding local marine environment (as a potential source), (2) in plants at the colonies, and (3) in bird tissues reflecting different exposure times/locations. #WSTC7 #ContSesh2
2/11. We measured geographic variation of #mercury in Rhinoceros auklets across the Pacific, & compared the impact of trans-ecosystem #biotransport at 2 locations under high (west Pacific) or low mercury levels (east Pacific) by tracking non-breeding movements. #WSTC7 #ContSesh2
1/11. #WSTC7 #ContSesh2 Seabirds accumulate & transport contaminants, acting as biovectors.
Biovector transport is nicely illustrated on this fig from Blais et al. 2007. But how effects at distant locations (e.g. wintering grounds) affect seabird mercury biotransport is unclear.
Tomorrow, Thursday 6th @bennett_sophie will open day 3 of #WSTC7 with
Contaminants and Marine Debris 2 #ContSesh2 at 7:00 UTC
with the third plenary tweeter of the conference @AkikoShoji
3/8 We will of course be having three fascinating plenaries across the conference:
@hentatisundberg in #FishSesh1 (4th)
@Emily_S_Choy in #ClimSesh (5th) and
@AkikoShoji in #ContSesh2 (6th)
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