Abstract
Researchers were asked to contribute new results addressing questions about the exposure and effects of mercury (Hg) in North American songbirds, a rapidly declining group of species that is the subject of enduring interest for millions of birdwatchers, the general public and conservation scientists. Important questions to be answered include: Is Hg causing or exacerbating songbird population declines? Which North American songbirds are at most risk and in which landscapes? Are there aspects of songbird natural history that pre-dispose them to risks of Hg exposure and effects, in particular, their migratory behavior? In all, 61 authors contributed 15 studies addressing aspects of these questions. Articles in this special issue address an array of topics including: (1) three studies on health effects in the laboratory using a domesticated songbird model species, the zebra finch; (2) three studies on changes in songbird exposure to Hg over time spans from less than a decade to more than a century; (3) five studies on landscape characteristics or management practices that cause the oft-noted spatial variation in Hg accumulation by resident songbirds, from the subarctic tundra to high-elevation tropical forests; (4) three papers examining the recently recognized role of migration behavior in predicting risk to songbirds from Hg; and (5) one paper on the potential pitfalls of using feather Hg concentration as a bioindicator for Hg exposure. In summary, although there are many questions still to be answered, it is clear that the effects of Hg are persistent long after exposure, Hg exposure of North American songbirds is not improving, predicting exposure requires a detailed understanding of ecosystem processes beyond simply the amount of Hg present at a site, migration behavior predisposes songbirds to risk of Hg exposure and effects, and carefully selecting appropriate bioindicator sites, species, and tissues is critical to any monitoring efforts.
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References
Abeysinghe KS, Qiu G, Goodale E, Anderson CW, Bishop K, Evers DC, Goodale MW, Hintelmann H, Liu S, Mammides C, Quan RC (2017) Mercury flow through an Asian rice-based food web. Environ Pollut 229:219–228
Ackerman JT, Eagles-Smith CA, Herzog MP, Hartman CA, Peterson SH, Evers DC, Jackson AK, Elliott JE, Vander Pol SS, Bryan CE (2016) Avian mercury exposure and toxicological risk across western North America: a synthesis. Sci Total Environ 568:749–769
Adams EM, Williams KA, Olsen BJ, Evers DC (2020) Mercury exposure in migrating songbirds: correlations with physical condition. Ecotoxicology
Bateman BL, Wildey C, Taylor L, Wu J, LeBaron GS, Langham G (2019) North American birds require mitigation and adaptation to reduce vulnerability to climate change. https://doi.org/10.1101/798652
Brasso RL, Cristol DA (2008) Effects of mercury exposure on the reproductive success of tree swallows (Tachycineta bicolor). Ecotoxicology 17:133–141
Brasso R, Rittenhouse KA, Winder VL (2020) Do songbirds in wetlands show higher mercury bioaccumulation relative to conspecifics in non-wetland habitats? Ecotoxicology
Cristol DA, Brasso RL, Condon AM, Fovargue RE, Friedman SL, Hallinger KK, Monroe AP, White AE (2008) The movement of aquatic mercury through terrestrial food webs. Science 320:335
Diringer SE, Berky AJ, Marani M, Ortiz EJ, Karatum O, Plata DL, Pan WK, Hsu-Kim H (2019) Deforestation due to artisanal and small-scale gold mining exacerbates soil and mercury mobilization in Madre de Dios, Peru. Environ Sci Technol 54:286–296
Driscoll CT, Han YJ, Chen CY, Evers DC, Lambert KF, Holsen TM, Kamman NC, Munson RK (2007) Mercury contamination in forest and freshwater ecosystems in the northeastern United States. BioScience 57:17–28
Edmonds ST, Evers DC, Cristol DA, Mettke-Hofmann C, Powell LL, McGann AJ, Armiger JW, Lane OP, Tessler DF, Newell P, Heyden K, O’Driscoll NJ (2010) Geographic and seasonal variation in mercury exposure of the declining Rusty Blackbird. Condor 112:789–799
Evers DC (2018) The effects of methylmercury on wildlife: a comprehensive review and approach for interpretation. In: Dellasala DA, Goldstein MI (eds) Encyclopedia of the anthropocene. Elsevier, New York, p 181–194
Evers DC, Burgess NM, Champoux L, Hoskins B, Major A, Goodale WM, Taylor RJ, Poppenga R, Daigle T (2005) Patterns and interpretation of mercury exposure in freshwater avian communities in northeastern North America. Ecotoxicology 14:193–221
Evers DC, Savoy LJ, DeSorbo CR, Yates DE, Hanson W, Taylor KM, Siegel L, Cooley JH, Bank M, Major A, Munney K, Vogel HS, Schoch N, Pokras M, Goodale W, Fair J (2008) Adverse effects from environmental mercury loads on breeding common loons. Ecotoxicology 17:69–81
Evers DC, Sunderland E (2019) Technical information report on mercury monitoring in biota. United Nations Environment Programme, Geneva, Switzerland
Greene VW, Swaddle JP, Moseley DL, Cristol DA (2018) Attractiveness of male zebra finches is not affected by exposure to an environmental stressor, dietary mercury. Condor 120:125–136
Hall LA, Woo I, Marvin-DiPasquale M, Tsao DC, Krabbenhoft DP, Takekawa JY, De La Cruz SEW (2020) Disentangling the effects of habitat biogeochemistry, food web structure, and diet composition on mercury bioaccumulation in a wetland bird. Environ Pollut 256:113280
Hallinger KK, Cornell KL, Brasso RL, Cristol DA (2011) Mercury exposure and survival in free-living tree swallows (Tachycineta bicolor). Ecotoxicology 20:39–46
Hallinger KK, Cristol DA (2011) The role of weather in mediating the effect of mercury exposure on reproductive success in tree swallows. Ecotoxicology 20:1368–1377
Hallinger KK, Zabransky DJ, Kazmer KA, Cristol DA (2010) Birdsong differs between mercury-polluted and reference sites. Auk 127:156–161
Hartman CA, Ackerman JT, Herzog MP (2019) Mercury exposure and altered parental nesting behavior in a wild songbird. Environ Sci Technol 53(9):5396–5405
Hawley DM, Hallinger KK, Cristol DA (2009) Compromised immune competence in free-living tree swallows exposed to mercury. Ecotoxicology 18:499–503
Heddle C, Elliott JE, Brown TM, Eng ML, Perkins M, Basu N, Williams TD (2020) Continuous exposure to mercury during embryogenesis and chick development affects later survival and reproduction of zebra finch (Taeniopygia guttata). Ecotoxicology
Howie MG, Jackson AK, Cristol DA (2018) Spatial extent of mercury contamination in birds and their prey on the floodplain of a contaminated river. Sci Total Environ 630:1446–1452
Jackson AK, Eagles-Smith CA, Emery C (2020) Spatial variation in aquatic invertebrate and riparian songbird mercury exposure across a river-reservoir system with a legacy of mercury contamination. Ecotoxicology
Jackson AK, Evers DC, Adams EM, Cristol DA, Eagles-Smith C, Edmonds ST, Gray CE, Hoskins B, Lane OP, Sauer A, Tear T (2015) Songbirds as sentinels of mercury in terrestrial habitats of eastern North America. Ecotoxicology 24:453–467
Jackson AK, Evers DC, Etterson MA, Condon AM, Folsom SB, Detweiler J, Schmerfeld J, Cristol DA (2011a) Mercury exposure affects the reproductive success of a free-living terrestrial songbird, the Carolina wren (Thryothorus ludovicianus). Auk 128:759–769
Jackson AK, Evers DC, Folsom SB, Condon AM, Diener J, Goodrick LF, McGann AJ, Schmerfeld J, Cristol DA (2011b) Mercury exposure in terrestrial birds far downstream of an historical point source. Environ Pollut 159:3302–3308
Keller RH, Xie L, Buchwalter DB, Franzreb KE, Simons TR (2014) Mercury bioaccumulation in Southern Appalachian birds, assessed through feather concentrations. Ecotoxicology 23:304–316
Knutsen CJ, Varian-Ramos CW (2020) Explaining variation in Colorado songbird blood mercury using migratory behavior, foraging guild, and diet. Ecotoxicology
Kopec AD, Bodaly RA, Lane OP, Evers DC, Leppold AJ, Mittelhauser GH (2018) Elevated mercury in blood and feathers of breeding marsh birds along the contaminated lower Penobscot River, Maine, USA. Sci Total Environ 634:1563–1579
Lane O, Adams EM, Pau N, O’Brien KM, Regan K, Farina M, Schneider-Moran T, Zarudsky J (2020) Long-term monitoring of mercury in adult saltmarsh sparrows breeding in Maine, Massachusetts and New York, USA 2000–2017. Ecotoxicology
Low KE, Ramsden DK, Jackson AK, Emery C, Robinson WD, Randolph J, Eagles-Smith CA (2020) Songbird feathers as indicators of mercury exposure: high variability and low predictive power suggest limitations. Ecotoxicology
Luo K, Xu Z, Wang X, Quan RC, Lu Z, Bi W, Zhao H, Qiu G (2020) Terrestrial methylmercury bioaccumulation in a pine forest food chain revealed by live nest videography observations and nitrogen isotopes. Environ Pollut 114530. https://doi.org/10.1016/j.envpol.2020.114530
Ma Y, Branfireun BA, Hobson KA, Guglielmo CG (2018a) Evidence of negative seasonal carry-over effects of breeding ground mercury exposure on survival of migratory songbirds. J Avian Biol 49:jav-01656
Ma Y, Perez CR, Branfireun BA, Guglielmo CG (2018b) Dietary exposure to methylmercury affects flight endurance in a migratory songbird. Environ Pollut 234:894–901
Markham KE, Sangermano F (2018) Evaluating wildlife vulnerability to mercury pollution from artisanal and small-scale gold mining in Madre de Dios, Peru. Tropical Conserv Sci 11:1940082918794320
Morran SAM, Elliott JE, Young JML, Eng ML, Basu N, Williams TD (2018) Ecologically-relevant exposure to methylmercury during early development does not affect adult phenotype in zebra finches (Taeniopygia guttata). Ecotoxicology 27(3):259–266
Paris OJ, Swaddle JP, Cristol DA (2018) Exposure to dietary methyl-mercury solely during embryonic and juvenile development halves subsequent reproductive success in adult zebra finches. Environ Sci Technol 52:3117–3124
Perkins M, Lane OP, Evers DC, Sauer A, Adams EM, O’Driscoll NJ, Edmunds ST, Jackson AK, Hagelin JC, Trimble J, Sunderland EM (2020) Historical patterns in mercury exposure for North American songbirds. Ecotoxicology
Peterson SH, Ackerman JT, Toney M, Herzog MP (2019) Mercury concentrations vary within and among individual bird feathers: a critical evaluation and guidelines for feather use in mercury monitoring programs. Environ Toxicol Chem 38:1164–1187
Rimmer CC, Lloyd JD, McFarland KP, Evers DC, Lane OP (2020) Patterns of blood mercury variation in two long-distance migratory thrushes on Mount Mansfield, Vermont. Ecotoxicology
Rosenberg KV, Dokter AM, Blancher PJ, Sauer JR, Smith AC, Smith PA, Stanton JC, Panjabi A, Helft L, Parr M, Marra PP (2019) Decline of the North American avifauna. Science 366:120–124
Scoville SA, Varian-Ramos CW, Adkins GA, Swaddle JP, Saha MS, Cristol DA (2020) Mercury delays cerebellar development in a model songbird species, the zebra finch. Ecotoxicology
Seewagen CL, Ma Y, Morbey YE, Guglielmo CG (2019) Stopover departure behavior and flight orientation of spring-migrant Yellowrumped Warblers (Setophaga coronata) experimentally exposed to methylmercury. J Ornithol 160(3):617–624
Seewagen CL (2020) The threat of global mercury pollution to bird migration: potential mechanisms and current evidence. Ecotoxicology
Shanley JB, Marvin-DiPasquale M, Lane O, Arendt W, Hall S, McDowell WH (2020) Resolving a paradox—high mercury deposition, but low bioaccumulation in northeastern Puerto Rico. Ecotoxicology
Smith JHE, Cristol DA, Swaddle JP (2018) Experimental infection and clearance of coccidian parasites in mercury-exposed zebra finches. Bulletin Environ Contamin Toxicol 100(1):89–94
Spickler JL, Swaddle JP, Gilson RL, Varian-Ramos CW, Cristol DA (2020) Sexually-selected traits as bioindicators: exposure to mercury affects carotenoid-based male bill color in zebra finches. Ecotoxicology
Stenhouse IJ, Adams EM, Phillips LM, Weidensaul S, McIntyre CL (2019) A preliminary assessment of mercury in the feathers of migratory songbirds breeding in the North American subarctic. Ecotoxicology
Swaddle JP, Diehl TR, Taylor CE, Fanaee AS, Benson JL, Huckstep NR, Cristol DA (2017) Exposure to dietary mercury alters cognition and behavior of zebra finches. Curr Zool 63:213–219
Tsui MTK, Adams EM, Jackson AK, Evers DC, Blum JD, Balogh SJ (2018) Understanding sources of methylmercury in songbirds with stable mercury isotopes: challenges and future directions. Environ Toxicol Chem 37:166–174
Wada H, Cristol DA, McNabb FMA, Hopkins WA (2009) Suppressed adrenocortical responses and thyroid hormone levels in birds near a mercury-contaminated river. Environ Sci Technol 43:6031–6038
Winder VL, Anteau MJ, Fisher MR, Wilcox MK, Igl LD, Ackerman JT (2020) Wetland water-management may influence mercury bioaccumulation in songbirds and ducks at a mercury hotspot. Ecotoxicology
Whitney MC, Cristol DA (2017a) Impacts of sublethal mercury exposure on birds: a detailed review. Rev Environ Contamination Toxicol 244:113–163
Whitney MC, Cristol DA (2017b) Rapid depuration of mercury in songbirds accelerated by feather molt. Environ Toxicol Chem 36:3120–3126
Wolf SE, Swaddle JP, Cristol DA, Buchser WJ (2017) Methylmercury exposure reduces the auditory brainstem response of zebra finches (Taeniopygia guttata). J Assoc Res Otolaryngol 18:569–579
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Cristol, D.A., Evers, D.C. The impact of mercury on North American songbirds: effects, trends, and predictive factors. Ecotoxicology 29, 1107–1116 (2020). https://doi.org/10.1007/s10646-020-02280-7
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DOI: https://doi.org/10.1007/s10646-020-02280-7