PMID- 35367428
OWN - NLM
STAT- MEDLINE
DCOM- 20220620
LR  - 20220729
IS  - 1096-0953 (Electronic)
IS  - 0013-9351 (Linking)
VI  - 212
IP  - Pt A
DP  - 2022 Sep
TI  - Mercury, legacy and emerging POPs, and endocrine-behavioural linkages: 
      Implications of Arctic change in a diving seabird.
PG  - 113190
LID - S0013-9351(22)00517-5 [pii]
LID - 10.1016/j.envres.2022.113190 [doi]
AB  - Arctic species encounter multiple stressors including climate change and 
      environmental contaminants. Some contaminants may disrupt hormones that govern 
      the behavioural responses of wildlife to climatic variation, and thus the 
      capacity of species to respond to climate change. We investigated correlative 
      interactions between legacy and emerging persistent organic pollutants (POPs), 
      mercury (Hg), hormones and behaviours, in thick-billed murres (Uria lomvia) 
      (N = 163) breeding in northern Hudson Bay (2016-2018). The blood profile of the 
      murres was dominated by methylmercury (MeHg), followed by much lower levels of 
      sum ( summation operator) 35 polychlorinated biphenyls (PCBs), hexachlorobenzene (HCB) and 
      p,p'-dichlorodiphenyltrichloroethylene (DDE), polybrominated diphenyl ethers 
      (PBDEs) BDE-47, -99 and BDE-100; all other measured organochlorine pesticides and 
      replacement brominated flame retardants had low concentrations if detected. 
      Inter-annual variations occurred in MeHg, circulating triiodothyronine (T3), 
      thyroxine (T4), and the foraging behaviours of the murres, identified using 
      GPS-accelerometers. Compared to the 50-year mean date (1971-2021) for 50% of 
      sea-ice coverage in Hudson Bay, sea-ice breakup was 1-2 weeks earlier (2016, 
      2017) or comparable (2018). Indeed, 2017 was the earliest year on record. 
      Consistent with relationships identified individually between MeHg and total T3, 
      and T3 and foraging behaviour, a direct interaction between these three 
      parameters was evident when all possible interactions among measured chemical 
      pollutants, hormones, and behaviours of the murres were considered collectively 
      (path analysis). When murres were likely already stressed due to early sea-ice 
      breakup (2016, 2017), blood MeHg influenced circulating T3 that in turn reduced 
      foraging time underwater. We conclude that when sea-ice breaks up early in the 
      breeding season, Hg may interfere with the ability of murres to adjust their 
      foraging behaviour via T3 in relation to variation in sea-ice.
CI  - Crown Copyright (c) 2022. Published by Elsevier Inc. All rights reserved.
FAU - Esparza, Ilse
AU  - Esparza I
AD  - Department of Natural Resource Sciences, McGill University, 21111 Lakeshore Road 
      Ste, Anne-de-Bellevue, QC H9X 3V9, Canada.
FAU - Elliott, Kyle H
AU  - Elliott KH
AD  - Department of Natural Resource Sciences, McGill University, 21111 Lakeshore Road 
      Ste, Anne-de-Bellevue, QC H9X 3V9, Canada. Electronic address: 
      kyle.elliott@mcgill.ca.
FAU - Choy, Emily S
AU  - Choy ES
AD  - Department of Natural Resource Sciences, McGill University, 21111 Lakeshore Road 
      Ste, Anne-de-Bellevue, QC H9X 3V9, Canada.
FAU - Braune, Birgit M
AU  - Braune BM
AD  - Ecotoxicology and Wildlife Health Division, Environment and Climate Change 
      Canada, National Wildlife Research Center, Carleton University, Ottawa, ON K1A 
      0H3, Canada.
FAU - Letcher, Robert J
AU  - Letcher RJ
AD  - Ecotoxicology and Wildlife Health Division, Environment and Climate Change 
      Canada, National Wildlife Research Center, Carleton University, Ottawa, ON K1A 
      0H3, Canada.
FAU - Patterson, Allison
AU  - Patterson A
AD  - Department of Natural Resource Sciences, McGill University, 21111 Lakeshore Road 
      Ste, Anne-de-Bellevue, QC H9X 3V9, Canada.
FAU - Fernie, Kim J
AU  - Fernie KJ
AD  - Department of Natural Resource Sciences, McGill University, 21111 Lakeshore Road 
      Ste, Anne-de-Bellevue, QC H9X 3V9, Canada; Ecotoxicology and Wildlife Health 
      Division, Environment and Climate Change Canada, 867 Lakeshore Rd, Burlington, ON 
      L7S 1A1, Canada. Electronic address: kim.fernie@ec.gc.ca.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20220331
PL  - Netherlands
TA  - Environ Res
JT  - Environmental research
JID - 0147621
RN  - 0 (Environmental Pollutants)
RN  - 0 (Hormones)
RN  - DFC2HB4I0K (Polychlorinated Biphenyls)
RN  - FXS1BY2PGL (Mercury)
SB  - IM
MH  - Animals
MH  - Arctic Regions
MH  - *Charadriiformes
MH  - *Diving
MH  - Environmental Monitoring
MH  - *Environmental Pollutants/analysis
MH  - Hormones
MH  - *Mercury/analysis
MH  - *Polychlorinated Biphenyls/analysis
OTO - NOTNLM
OT  - Arctic
OT  - Foraging behaviour
OT  - Mercury
OT  - Seabirds
OT  - Thyroid hormones
EDAT- 2022/04/04 06:00
MHDA- 2022/06/22 06:00
CRDT- 2022/04/03 20:25
PHST- 2021/12/07 00:00 [received]
PHST- 2022/03/21 00:00 [revised]
PHST- 2022/03/22 00:00 [accepted]
PHST- 2022/04/04 06:00 [pubmed]
PHST- 2022/06/22 06:00 [medline]
PHST- 2022/04/03 20:25 [entrez]
AID - S0013-9351(22)00517-5 [pii]
AID - 10.1016/j.envres.2022.113190 [doi]
PST - ppublish
SO  - Environ Res. 2022 Sep;212(Pt A):113190. doi: 10.1016/j.envres.2022.113190. Epub 
      2022 Mar 31.