NDLI: Effects of methylmercury exposure on the behavior of captive-reared common loon (Gavia immer) chicks

Content Provider	Springer Nature Link
Author	Kew, Kevin P. Hines, Randy K. Meyer, Michael W. Suarez, Sarah A. Gray, Brian R.
Copyright Year	2010
Abstract	Behavioral effects resulting from exposure to dietary methylmercury (MeHg) have been reported in studies of several wildlife species. However, quantifying the impact of contaminant exposure on wild populations is complicated by the confounding effects of other environmental stressors. We controlled confounding stressors in a laboratory study to quantify the level of dietary MeHg exposure associated with negative effects on the fitness of captive-reared common loon (Gavia immer) chicks. We evaluated the effect of MeHg on loon chick behavior by employing several assays, including measures of righting reflexes, responsiveness to taped parental calls, reaction to frightening stimuli, and estimates of time activity budgets. Evidence suggested that as chicks aged, those exposed to nominal dietary dose levels of 0.4 and 1.2 μg Hg/g wet-weight in food (average estimated delivered dietary level of 0.55 and 1.94 μg Hg/g, respectively) were less likely (p < 0.01) to right themselves after being positioned on their backs during outdoor trials (≥37 days old) compared to chicks on the control diet. We detected differences (p < 0.05) in several response variables with respect to source of eggs. Chicks from nests on low-pH lakes tended to spend more time on resting platforms, spent less time in the shade, were more likely to walk across a platform upon release and do it quicker, were less responsive to a frightening stimulus, and exhibited less intense response to parental wail calls than did chicks from neutral pH-lakes. Rapid MeHg excretion during feather growth likely provides loon chicks protection from MeHg toxicity and may explain the lack of behavioral differences with dietary intake. Lake source effects suggest that in ovo exposure to MeHg or other factors related to lake pH have consequences on chick behavior.
Starting Page	933
Ending Page	944
Page Count	12
File Format	PDF
ISSN	09639292
Journal	Ecotoxicology
Volume Number	19
Issue Number	5
e-ISSN	15733017
Language	English
Publisher	Springer US
Publisher Date	2010-03-09
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Behavior Common loon Gavia immer Methylmercury Mercury Environmental Management Ecology Environment Ecotoxicology
Content Type	Text
Resource Type	Article
Subject	Health, Toxicology and Mutagenesis Medicine Toxicology Management, Monitoring, Policy and Law

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