Terrestrial discharges mediate trophic shifts and enhance methylmercury accumulation in estuarine
نویسندگان
چکیده
Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden. Umeå Marine Sciences Centre, Umeå University, SE-910 20 Hörnefors, Sweden. Department of Ecology and Environmental Science, Umeå University, SE-901 87 Umeå, Sweden. Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden. Department of Environmental Sciences, Rutgers University, New Brunswick, NJ 08901, USA. Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, SE-750 07 Uppsala, Sweden. *Present address: Department of Marine Sciences, University of Connecticut, 1080 Shennecossett Road, Groton, CT 06340, USA. †Corresponding author. Email: [email protected]
منابع مشابه
Terrestrial discharges mediate trophic shifts and enhance methylmercury accumulation in estuarine biota
The input of mercury (Hg) to ecosystems is estimated to have increased two- to fivefold during the industrial era, and Hg accumulates in aquatic biota as neurotoxic methylmercury (MeHg). Escalating anthropogenic land use and climate change are expected to alter the input rates of terrestrial natural organic matter (NOM) and nutrients to aquatic ecosystems. For example, climate change has been p...
متن کاملStable isotope evidence for trophic subsidy of coastal benthic fisheries by river discharge plumes off small estuaries
Major rivers produce large plumes which subsidize benthic marine food webs. Because most plumes are smaller, we tested whether these also can link marine food webs with riverine discharges. We used stable isotopes to detect assimilation of terrestrial organic matter by fish, crustaceans and cephalopods harvested from plume areas off two small estuaries in eastern Australia, contrasted with valu...
متن کاملTaking the trophic bypass: aquatic-terrestrial linkage reduces methylmercury in a terrestrial food web.
Ecosystems can be linked by the movement of matter and nutrients across habitat boundaries via aquatic insect emergence. Aquatic organisms tend to have higher concentrations of certain toxic contaminants such as methylmercury (MeHg) compared to their terrestrial counterparts. If aquatic organisms come to land, terrestrial organisms that consume them are expected to have elevated MeHg concentrat...
متن کاملFreshwater discharges drive high levels of methylmercury in Arctic marine biota.
Elevated levels of neurotoxic methylmercury in Arctic food-webs pose health risks for indigenous populations that consume large quantities of marine mammals and fish. Estuaries provide critical hunting and fishing territory for these populations, and, until recently, benthic sediment was thought to be the main methylmercury source for coastal fish. New hydroelectric developments are being propo...
متن کاملBenthic and Pelagic Pathways of Methylmercury Bioaccumulation in Estuarine Food Webs of the Northeast United States
Methylmercury (MeHg) is a contaminant of global concern that bioaccumulates and bioamagnifies in marine food webs. Lower trophic level fauna are important conduits of MeHg from sediment and water to estuarine and coastal fish harvested for human consumption. However, the sources and pathways of MeHg to these coastal fisheries are poorly known particularly the potential for transfer of MeHg from...
متن کامل