NDLI: Effects of injected methylmercury on the hatching of common loon (Gavia immer) eggs.

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Effects of injected methylmercury on the hatching of common loon (Gavia immer) eggs.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kenow, Kevin P. Meyer, Michael W. Rossmann, Ronald Gendron-Fitzpatrick, Annette Gray, Brian R.
Description	Country affiliation: United States Author Affiliation: Kenow KP ( Upper Midwest Environmental Sciences Center, US Geological Survey, La Crosse, WI 54603, USA. kkenow@usgs.gov)
Abstract	To determine the level of in ovo methylmercury (MeHg) exposure that results in detrimental effects on fitness and survival of loon embryos and hatched chicks, we conducted a field study in which we injected eggs with various doses of MeHg on day 4 of incubation. Eggs were collected following about 23 days of natural incubation and artificially incubated to observe hatching. Reduced embryo survival was evident in eggs injected at a rate of ≥1.3 µg Hg/g wet-mass. When maternally deposited Hg and injected Hg were considered together, the median lethal concentration of Hg (LC(50)) was estimated to be 1.78 µg Hg/g wet-mass. Organ mass patterns from eggs of chicks injected at a rate of 2.9 µg Hg/g differed from that of controls and chicks from the 0.5 µg Hg/g treatment, largely related to a negative relation between yolk sac mass and egg mercury concentration. Chicks from eggs in the 2.9 µg Hg/g treatment were also less responsive to a frightening stimulus than controls and chicks from the 0.5 µg Hg/g treatment. We also found that the length of incubation period increased with increasing egg mercury concentration. Tissue Hg concentrations were strongly associated (r(2) ≥ 0.80) with egg Hg concentration.
File Format	HTM / HTML
ISSN	09639292
Issue Number	7
Volume Number	20
e-ISSN	15733017
Journal	Ecotoxicology
Language	English
Publisher	Springer
Publisher Date	2011-10-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Ecology Discipline Environmental Health Discipline Toxicology Birds Mercury Toxicity Methylmercury Compounds Ovum Drug Effects Animals Environmental Exposure Analysis Environmental Monitoring Methods Hydrogen-ion Concentration Lakes Chemistry Pharmacokinetics Risk Factors Species Specificity Tissue Distribution Water Pollutants, Chemical Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Health, Toxicology and Mutagenesis Medicine Toxicology Management, Monitoring, Policy and Law

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