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High levels of mercury found in mountain lions linked to coastal fog

(06.12.2019)


Background:
Mercury, a naturally occurring element, is released into the environment through a variety of natural processes and human activities, including mining and coal-fired power plants. In its elemental form, mercury is a global pollutant, that as an atmospheric pollutant can travel around the world.

As atmospheric mercury rains down on oceans, it is converted by anaerobic bacteria in deep waters to methylmercury, the most toxic form of mercury. Upwelling brings some methylmercury to the surface, where it is released back into the atmosphere and carried by fog. At high concentrations, methylmercury can cause neurological damage, including memory loss and reduced motor coordination, and it can decrease the viability of offspring.


The new study:
Marine fog brings more than cooler temperatures to coastal areas. Researchers at UC Santa Cruz have discovered elevated levels of mercury in mountain lions, the latest indication that the neurotoxin is being carried in fog, deposited on the land, and making its way up the food chain.

Concentrations of mercury in pumas in the Santa Cruz Mountains were three times higher than lions who live outside the fog zone. Similarly, mercury levels in lichen and deer were significantly higher inside the fog belt than beyond it.

Photo: Mountain lion lounging in a cottonwood tree (Credit: Justin Shoemaker)

At least one lion studied had mercury levels known to be toxic to species like mink and otters, and two others had "sublethal" levels that reduce fertility and reproductive success.


Mercury levels found in pumas are approaching toxic thresholds that could jeopardize reproduction and even survival, according to the researchers, whose findings appear in an article that is available free online.

Led by Peter Weiss-Penzias, an environmental toxicologist who has pioneered the study of pollutants in coastal fog, the study is the first to trace the atmospheric source of super-toxic methylmercury in the terrestrial food web up to a top predator.

"Lichen don’t have any roots so the presence of elevated methylmercury in lichen must come from the atmosphere," said Weiss-Penzias. "Mercury becomes increasingly concentrated in organisms higher up the food chain."

Although mercury levels in fog present no health risk to humans, the risk to terrestrial mammals may be significant. With each step up the food chain, from lichen to deer to mountain lions, mercury concentrations can increase by at least 1,000 times, said Weiss-Penzias.

The study included fur and whisker samples from 94 coastal mountain lions and 18 noncoastal lions. Mercury concentrations in the coastal samples averaged about 1,500 parts per billion (ppb), compared to nearly 500 ppb in the noncoastal group. At least one lion studied had mercury levels known to be toxic to species like mink and otters, and two others had "sublethal" levels that reduce fertility and reproductive success.

Elevated concentrations of mercury present an additional potential threat to a top predator that is already coping with habitat loss and other risks posed by humans, said senior author Chris Wilmers, a professor of environmental studies and the director of the Puma Project.

"These mercury levels might compound the impacts of trying to make it in an environment like the Santa Cruz Mountains, where there is already so much human influence, but we don't really know," said Wilmers. "Levels will be higher 100 years from now, when the Earth's mercury budget is higher because of all the coal we're pumping into the atmosphere."


The source of fog-borne mercury

"Fog is a stabilizing medium for methylmercury," said Weiss-Penzias. "Fog drifts inland and rains down in microdroplets, collecting on vegetation and dripping to the ground, where the slow process of bioaccumulation begins." 


Top predators, an international treaty, and a foggy bike ride

Fog is present in coastal areas that border oceans, environmental "hotspots" that are also home to high concentrations of humans. Weiss-Penzias is eager to investigate mercury levels in coastal Chile, where the top predator is a lizard, while Wilmers is curious about mercury levels in coyotes, bobcats, and birds in coastal areas.

"We need to protect the top predators in the environment," said Weiss-Penzias. "They're key-stone species. They perform ecosystem services. When you change one thing, it has cascading effects through the system."

As an example of cascade effects, Wilmers cited the removal of wolves from many states in the eastern United States, which resulted in more coyotes, who preyed on foxes that had historically kept the rodent population in check. The loss of foxes ultimately made way for more rodents, which help transmit Lyme disease, said Wilmers, who added, "Locally, potentially, mountain lions keep deer and small predators in check, which could reduce Lyme disease."

The global effort to protect humans and the environment from mercury includes the Minamata Convention on Mercury, an international treaty that was adopted in 2013. Named after a Japanese city that endured a dire incident of mercury poisoning, the treaty is broad in scope, encompassing the entire life cycle of mercury.

"It's important for the future of that treaty to understand all the different ways that mercury impacts the environment," said Weiss-Penzias.

As an atmospheric chemist, Weiss-Penzias said he first became curious about fog-borne pollutants about a decade ago while riding his bike to work. "I was riding through this absolute fogstorm, with water dripping off my glasses, and I just wondered, 'What's in this stuff?'" he recalled. Hypothesizing that mercury might de-gas out of the ocean and end up in fog, he collected samples and sent them to a lab.

"The lab called me, saying they'd have to re-run the tests, because they didn't believe the numbers," said Weiss-Penzias.

Source:
This article has been republished from the following materials. Note: material may have been edited for length and content.


The original publication:

Peter S. Weiss-Penzias, Michael S. Bank, Deana L. Clifford, Alicia Torregrosa, Belle Zheng, Wendy Lin & Christopher C. Wilmers, Marine fog inputs appear to increase methylmercury bioaccumulation in a coastal terrestrial food web.  Scientific Reports, 9 (2019) 17611. DOI: 10.1038/s41598-019-54056-7.



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T.R. Khan, D. Obrist, Y. Agnan, N.E. Selin, J.A. Perlinger, Atmosphere-terrestrial exchange of gaseous elemental mercury: parameterization improvement through direct comparison with measured ecosystem fluxes. Environ. Sci.:Processes Impacts, 21/10 (2019) 1699-1712. DOI: 10.1039/c9em00341j

A.M. Azad, S. Frantzen, M.S. Bank, I.A. Johnsen, E. Tessier, D. Amouroux, L. Madsen, A. Maage. Spatial distribution of mercury in seawater, sediment, and seafood from the Hardangerfjord ecosystem, Norway. Sci. Total Environ. 667 (2019) 622–637. DOI: 10.1016/j.scitotenv.2019.02.352

J.T. Ackerman, C.A. Hartman, M.P. Herzog, Mercury contamination in resident and migrant songbirds and potential effects on body condition. Environ. Pollut. 246 (2019) 797–810.  DOI: 10.1016/j.envpol.2018.11.060

C.A. Eagles-Smith, E.K. Silbergeld, M. Basu, P. Bustamante, F. Diaz-Barriga, W.A. Hopkins, K.A. Kidd, J.F. Nyland, Modulators of mercury risk to wildlife and humans in the context of rapid global change. Ambio 47/2 (2018) 170–197. DOI: 10.1007/s13280-017-1011-x

D. Obrist, J.L. Kirk, L. Zhang, E.M. Sunderland, M. Jiska, N.E. Selin, A review of global environmental mercury processes in response to human and natural perturbations: Changes of emissions, climate, and land use. Ambio 47/2 (2018) 116–140. DOI:  10.1007/s13280-017-1004-9

K.H. Coale, W.A.Heim, J. Negrey, P. Weiss-Penzias, D. Fernandez, A. Olson, H. Chiswell, A. Byington, A. Bonnema, S. Martenuk, A. Newman, C. Beebe, C. Till, The distribution and speciation of mercury in the California current: Implications for mercury transport via fog to land. Deep Sea Res. Part II Top. Stud. Oceanogr., 151 (2018) 77–88. DOI: 10.1016/j.dsr2.2018.05.012

P. Weiss-Penzias, A. Sorooshian, K. Coale, W. Heim, E. Crosbie, H. Dadashazar, A.B. MacDonald, Z. Wang, H. Jonsson, Aircraft Measurements of Total Mercury and Monomethyl Mercury in Summertime Marine Stratus Cloudwater from Coastal California, USA. Environ. Sci. Technol. 52/5 (2018) 2527–2537. DOI: 10.1021/acs.est.7b05395

  S.H. Peterson, J.T. Ackerman, D.E. Crocker, D.P. Costa, Foraging and fasting can influence contaminant concentrations in animals: an example with mercury contamination in a free-ranging marine mammal. Proc. R. Soc. B Biol. Sci. 285 (2018) 20172782. DOI: 10.1098/rspb.2017.2782

A.L. Soerensen, D.J. Jacob, A.T. Schartup, J.A. Fisher, I. Lehnherr, V.L. St. Louis, L.-E. Heimbürger, J.E. Sonke, D.P. Krabbenhoft, E.M. Sunderland, A mass budget for mercury and methylmercury in the Arctic Ocean. Glob. Biogeochem. Cycles 30 (2018) 560–575. DOI: 10.1002/2015GB005280

D. Obrist, Y. Agnan, M. Jiskra, C.L. Olson, D.P. Colegrove, J. Hueber, C.W. Moore, J.E. Sonke, D. Helmi, Tundra uptake of atmospheric elemental mercury drives Arctic mercury pollution. Nature 547 (2017) 201–204. DOI: 10.1038/nature22997

K.M. Eccles, P.J. Thomas, H.M. Chan, Predictive meta-regressions relating mercury tissue concentrations of freshwater piscivorous mammals: Mercury tissue conversions of piscivorous mammals. Environ. Toxicol. Chem. 36/9 (2017) 2377–2384. DOI: 10.1002/etc.3775

Y. Agnan, T. Le Dantec, C.W. Moore, G.C. Edwards, D. Obrist, New constraints on terrestrial surface-atmosphere fuxes of gaseous elemental mercury using a global database. Environ. Sci. Technol. 50/2 (2016) 507–524. DOI: 10.1021/acs.est.5b04013

P. Weiss-Penzias, K. Coale, W. Heim, D. Fernandez, A. Oliphant, C. Dodge, D. Hoskins, J. Farlin, R. Moranville, A. Olson, Total- and monomethyl-mercury and major ions in coastal California fog water: Results from two years of sampling on land and at sea. Elem. Sci. Anthr., 4 (2016) 000101. DOI: 10.12952/journal.elementa.000101

T. Bechshoft, A.E. Derocher, E. Richardson, N.J. Lunn, V.L. St. Louis, Hair Mercury Concentrations in Western Hudson Bay Polar Bear Family Groups. Environ. Sci. Technol., 50/10 (2016) 5313–5319. DOI: 10.1021/acs.est.6b00483

R. Bargagli, Moss and lichen biomonitoring of atmospheric mercury: A review. Sci. Total Environ. 572 (2016) 216–231. DOI: 10.1016/j.scitotenv.2016.07.202

P.A. Baya, M. Gosselin, T. Lehnherr, V.L. St. Louis, H. Hintelmann, Determination of Monomethylmercury and Dimethylmercury in the Arctic Marine Boundary Layer. Environ. Sci. Technol. 49/1 (2015) 223–232. DOI: 10.1021/es502601z

K.A. St. Pierre, V.L. St. Louis, J.L. Kirk, I. Lehnherr, S. Wang, C. La Farge. Importance of Open Marine Waters to the Enrichment of Total Mercury and Monomethylmercury in Lichens in the Canadian High Arctic. Environ. Sci. Technol. 49/10 (2015) 5930–5938. DOI: 10.1021/acs.est.5b00347

M. Noël, J. Spence, K.A. Harris, C.T. Robbins, J.K. Fortin, P.S. Ross, J.R. Christensen, Grizzly Bear Hair Reveals Toxic Exposure to Mercury through Salmon Consumption. Environ. Sci. Technol. 48/13 (2014) 7560–7567. DOI: 10.1021/es500631g

G. Wright, M.S. Gustin, P. Weiss-Penzias, M.B. Miller, Investigation of mercury deposition and potential sources at six sites from the Pacific Coast to the Great Basin, USA. Sci. Total Environ. 470–471 (2014) 1099–1113. DOI: 10.1016/j.scitotenv.2013.10.071

O. Zvĕřina, K. Láska, R. Červenka, J. Kuta, P. Coufalík, J. Komárek, Analysis of mercury and other heavy metals in lichen Usnea antarctica from James Ross Island, Antarctica. Environ.
Monit. Assess. 186 (2014) 9089–9100. DOI: 10.1007/s10661-014-4068-z

C.T. Driscoll, R.P. Mason, H.M. Chan, D.J. Jacob, N. Pirrone, Mercury as a Global Pollutant: Sources, Pathways, and Effects. Environ. Sci. Technol., 47/10 (2013) 4967–4983. DOI: 10.1021/es305071v

C.C. Gilmour, M. Podar, A.L. Bullock, A.M. Graham, S. Brown, A.C. Somenahally, A. Johs, R. Hurt, K.L. Bailey, D.A. Elis, Mercury Methylation by Novel Microorganisms from New Environments. Environ. Sci. Technol. 47/20 (2013) 11810–11820. DOI: 10.1021/es403075t

R.P. Mason, A.L. Choi, W.F. Fitzgerald, C.R. Hammerschmidt, C.H. Lamborg, A.L. Soerensen, E.M. Sunderland, Mercury biogeochemical cycling in the ocean and policy implications. Environ. Res., 119 (2012) 101–117. DOI: 10.1016/j.envres.2012.03.013.

P.S. Weiss-Penzias, C. Ortiz Jr., R.P. Acosta, W. Heim, J.P. Ryan, D. Fernandez, J.L. Collett Jr., A. R. Flegal, Total and monomethyl mercury in fog water from the central California coast. Geophys. Res. Lett. 39 (2012) L03804. DOI: 10.1029/2011GL050324

A.M. Scheuhammer, N. Basu, D.C. Evers, G. Heinz, M.B. Sandheinrich, M.S. Bank, Ecotoxicology of mercury in fish and wildlife: Recent advances. In:  M.S. Bank (Editor) Mercury in the Environment: Pattern and Process. University of California Press, Berkeley, CA, USA, 223–238 (2012). DOI: 10.1525/california/9780520271630.003.0011

D.R. Bittrich, A.P. Rutter, B.D. Hall, J.J. Schauer, Photodecomposition of Methylmercury in Atmospheric Waters. Aerosol Air, Qual. Res. 11 (2011) 290–298. DOI: 10.4209/aaqr.2010.11.0096

A.-T. E. Vo, M.S. Bank, J.P. Shine, S.V. Edwards, Temporal increase in organic mercury in an endangered pelagic seabird assessed by century-old museum specimens. Proc. Natl. Acad. Sci., 108 (2011) 7466–7471. DOI: 10.1073/pnas.1013865108

C.H. Conaway, F.J. Black, P. Weiss-Penzias, M. Gault-Ringold, A.R. Flegal, Mercury speciation in Pacific coastal rainwater, Monterey Bay, California. Atmos. Environ. 44/14 (2010) 1788–1797. DOI: 10.1016/j.atmosenv.2010.01.021

A.R. Flegal, C. Gallon, S. Hibdon, Z.E. Kuspa, L.F. Laporte, Declining—but Persistent—Atmospheric Contamination in Central California from the Resuspension of Historic Leaded Gasoline Emissions As Recorded in the Lace Lichen (Ramalina menziesii Taylor) from 1892 to 2006. Environ. Sci. Technol. 44/14 (2010) 5613–5618. DOI: 10.1021/es100246e

C.H. Conaway, F.J. Black, M. Gault-Ringold, J.T. Pennington, F.P. Chavez, A.R. Flegal, Dimethylmercury in Coastal Upwelling Waters, Monterey Bay, California. Environ. Sci. Technol. 43/5 (2009) 1305–1309. DOI: 10.1021/es802705t

N.E. Selin, Global Biogeochemical Cycling of Mercury: A Review. In: Ann. Rev. Environ. Resour., 34/1 (2009) 43–63. DOI: 10.1146/annurev.environ.051308.084314

F.J. Black, C.H. Conaway, A.R. Flegal, Stability of Dimethyl Mercury in Seawater and Its Conversion to Monomethyl Mercury. Environ. Sci. Technol. 43/11 (2009) 4056–4062. DOI:  10.1021/es9001218

P. Weiss-Penzias, M.S. Gustin, S.N. Lyman, Observations of speciated atmospheric mercury at three sites in Nevada: Evidence for a free tropospheric source of reactive gaseous mercury. J. Geophys. Res. 114 (2009) D14302. DOI: 10.1029/2008JD011607

S. Lindberg, R. Bullock, R. Ebinghaus, D. Engstrom, X.B. Feng, W. Fitzgerald, N. Pirrone, E. Prestbo, C. Seigneur, A synthesis of progress and uncertainties in attributing the sources of mercury in deposition. Ambio 36/1 (2007) 19–32. DOI: 10.1579/0044-7447(2007)36[19:ASOPAU]12.0.CO;2

N.E. Selin, D.J. Jacob, R.J. Park, R.M. Yantosca, S. Strode, L. Jaeglé, D. Jaffe, Chemical cycling and deposition of atmospheric mercury: Global constraints from observations. J. Geophys. Res., 112/D2 (2007) D02308. DOI: 10.1029/2006JD007450

D.D. Lefebvre, D. Kelly, K. Budd, Biotransformation of Hg (II) by cyanobacteria. Appl Env. Microbiol 73/1 (2007) 243–249. DOI: 10.1128/AEM.01794-06

A.M. Scheuhammer, M.W. Meyer, M.B. Sandheinrich, M.W. Murray, Effects of environmental methylmercury on the health of wild birds, mammals, and fish. Ambio 36/1 (2007) 12–18. DOI: 10.1579/0044-7447(2007)36[12:EOEMOT]2.0.CO;2

M.S. Bank, J.B. Crocker, B. Connery, A. Amirbahman, Mercury bioaccumulation in green frog and bullfrog tadpoles from Acadia National Park. Environ. Toxicol. Chem. 26/1 (2007) 118–125. DOI: 10.1897/07-035R.1

C.D. Ritchie, W. Richards, P.A. Arp, Mercury in fog on the Bay of Fundy (Canada). Atmos. Environ., 40 (2006) 6321–6328. DOI: 10.1016/j.atmosenv.2006.05.057

C.R. Hammerschmidt, W.F. Fitzgerald, Methylmercury in Mosquitoes Related to Atmospheric Mercury Deposition and Contamination. Environ. Sci. Technol., 39/9 (2005) 3034–3039. DOI: 10.1021/es0485107

J. Newman, E. Zillioux, E. Rich, L. Liang, C. Newman, Historical and Other Patterns of Monomethyl and Inorganic Mercury in the Florida Panther (Puma concolor coryi). Arch. Environ. Contam. Toxicol., 48 (2005) 75–80. DOI: 10.1007/s00244-003-0130-5

M.G. Barron,  S.E. Duvall, K.J. Barron, Retrospective and current risks of mercury to panthers in the Florida Everglades. Ecotoxicology, 13 (2004) 223-229. DOI: 10.1023/B:ECTX.000023567.42698.38

S.T. Lawson, T.D. Scherbatskoy, E.G. Malcolm, G.J. Keeler, Cloud water and throughfall deposition of mercury and trace elements in a high elevation spruce–fir forest at Mt. Mansfield, Vermont. J Env. Monit 5/4 (2003) 578–583. DOI: 10.1039/B210125D

M.A. Thomas, C.H. Conaway, D.J. Steding, M. Marvin-DiPasquale, K.E. Abu-Saba, A.R. Flegal, Mercury contamination from historic mining in water and sediment, Guadalupe River and San Francisco Bay, Geochem. Explor. Environ. Anal., 2/3 (2002) 211–217. DOI: 10.1144/1467-787302-024

J. Garty, Biomonitoring Atmospheric Heavy Metals with Lichens: Theory and Application, Crit. Rev. Plant Sci., 20/4 (2001) 309-371. DOI: 10.1080/20013591099254

H. Hintelmann, K. Keppel-Jones, R.D. Evans, Constants of mercury methylation and demethylation rates in sediments and comparison of tracer and ambient mercury availability. Environ. Toxicol. Chem., 19/9 (2000) 2204–2211. DOI: 10.1002/etc.5620190909

A. Gnamuš, A.R. Byrne, M. Horvat, Mercury in the Soil-Plant-Deer-Predator Food Chain of a Temperate Forest in Slovenia. Environ. Sci. Technol. 34 (2000) 3337–3345. DOI: 10.1021/es991419w

M.F. Wolfe, S. Schwarzbach, R.A. Sulaiman, Effects of mercury on wildlife: A comprehensive review. Environ. Toxicol. Chem. 17/2 (1998) 146–160. DOI: 10.1002/etc.5620170203

C.A. Evans, T.C. Hutchinson, Mercury accumulation in transplanted moss and lichens at high elevation sites in Quebec. Water. Air. Soil Pollut., 90/3-4 (1996) 475–488. DOI: 10.1007/BF00282663

N.S. Bloom, On the Chemical Form of Mercury in Edible Fish and Marine Invertebrate Tissue. Can. J. Fish. Aquat. Sci. 49 (1992) 1010–1017. DOI: 10.1139/f92-113

M.E. Roelke, D.P. Schultz, C.F. Facemire, S.F. Sundlof, H.E. Royals, Mercury contamination in Florida panthers. Prep. Tech. Subcomm. Fla. Panther Interag. Comm (1991). available from: https://ecos.fws.gov/ServCat/DownloadFile/21290?Reference=22759

N. Bloom, Determination of Picogram Levels of Methylmercury by Aqueous Phase Ethylation, Followed by Cryogenic Gas Chromatography with Cold Vapour Atomic Fluorescence Detection. Can. J. Fish. Aquat. Sci. 46/7 (1989) 1131–1140. DOI: 10.1139/f89-147

R. Eisler, Mercury hazards to fish, wildlife, and invertebrates: a synoptic review.  U.S.  Fish and Wildlife Service Biological Report 85(1.10) (1987) 1-63. available from: https://www.pwrc.usgs.gov/eisler/CHR_10_Mercury.pdf



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last time modified: November 26, 2023



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