Mercury bioaccumulation increases with latitude in a coastal marine fish (Atlantic silverside,Menidia menidia)
| Autor: | Robert P. Mason, Celia Y. Chen, David O. Conover, Prentiss H. Balcom, Zofia Baumann, Nicholas S. Fisher, Kate L. Buckman, Hannes Baumann |
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| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
biology Ecology Atlantic silverside chemistry.chemical_element Growing season 010501 environmental sciences Aquatic Science biology.organism_classification 01 natural sciences Article Latitude Mercury (element) chemistry.chemical_compound chemistry Bioaccumulation Menidia Forage fish Methylmercury Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences |
| Zdroj: | Canadian Journal of Fisheries and Aquatic Sciences. 74:1009-1015 |
| ISSN: | 1205-7533 0706-652X |
| DOI: | 10.1139/cjfas-2016-0396 |
| Popis: | Human exposure to the neurotoxic methylmercury (MeHg) occurs primarily via the consumption of marine fish, but the processes underlying large-scale spatial variations in fish MeHg concentrations [MeHg], which influence human exposure, are not sufficiently understood. We used the Atlantic silverside (Menidia menidia), an extensively studied model species and important forage fish, to examine latitudinal patterns in total mercury (Hg) [Hg] and [MeHg]. Both [Hg] and [MeHg] significantly increased with latitude (0.014 and 0.048 μg MeHg·g dry weight−1per degree of latitude in juveniles and adults, respectively). Four known latitudinal trends in silverside traits help explain these patterns: latitudinal increase in MeHg assimilation efficiency, latitudinal decrease in MeHg efflux, latitudinal increase in weight loss due to longer and more severe winters, and latitudinal increase in food consumption as an adaptation to decreasing length of the growing season. Given the absence of a latitudinal pattern in particulate MeHg, a diet proxy for zooplanktivorous fish, we conclude that large-scale spatial variation in growth is the primary control of Hg bioaccumulation in this and potentially other fish species. |
| Databáze: | OpenAIRE |
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