Cooperative Research Units
Education, Research And Technical Assistance For Managing Our Natural Resources
Home | Intranet | Digital Measures | Help

Effects of local and landscape heterogeneity on mercury loadings in lotic and palustrine amphibians from Acadia National Park, Maine (collaborators: M. Bank, A. Amirbahman, UMaine)

four-toed salamander female guarding developing embryos in nest<br />

Duration

January 2003 - December 2008

Narrative

Mercury (Hg) contamination in the northeastern United States, including Acadia National Park (ANP), is well documented and continues to be a public health issue of great concern. Hg contamination of wild amphibians has received little attention despite mounting evidence and reports of worldwide population declines. Here we report total Hg and methyl Hg concentrations for water, sediment, and green frog and bullfrog tadpoles (~ 1 year of age) from ANP, Maine, USA. Average total Hg concentrations in green frog and bullfrog tadpoles were 25.1+1.5 and 19.1+0.8 Hg ng/g wet wt, respectively. Average total Hg was highest for green frog tadpoles sampled from the Schooner Head site, a small semi-permanent pond where Ranavirus was detected during the summer 2003 sampling period. Methyl Hg comprised 7.6-40% of the total Hg in tadpole tissue (wet wt. basis), and average total Hg levels in tadpoles were significantly different (P < 0.05) among pond sites (n = 9). Total Hg in pond water was a significant predictor of tadpole total Hg levels (P < 0.05). Dissolved organic carbon was a significant predictor of both total Hg (P < 0.05) and Methyl Hg (P < 0.05) in water, and total Hg in water was also strongly correlated with Methyl Hg in water (P < 0.05). The methylation efficiency (ME) rates defined as total Hg:Methyl Hg ratio in pond waters sampled at ANP were higher than the reported ME for national parks located in the western region of the United States. Of the 9 ponds we sampled at ANP, 44% had ME greater than 10% suggesting that wetland food webs in the park are likely susceptible to high levels of total Hg bioaccumulation. These findings may be important to National Park Service resource managers especially considering the Class I airshed status of ANP and the strong potential for negative effects to aquatic ecosystem structure and function from Hg pollution.

Research Products and Activities

Thesis

  • Bank, M.S. 2005. Mercury bioaccumulation and habitat relations of lotic and lentic amphibians from Acadia National Park, Maine, USA. PhD dissertation, Ecology and Environmental Sciences Program, University of Maine, Orono. 155 pp.
 

Current Staff

Federal Staff: 102

Masters Students: 247

Phd Students: 163

Post Docs: 55

University Staff: 266

5 Year Summary

Students graduated: 722

Scientific Publications: 1960

Presentations: 4355

 

Personnel

Funding Agencies

  • Declining Amphibian Population Task Force
  • Maine Water Research Institute
  • Research in Eastern National Parks

Links

Cooperative Research Units Program Headquarters Cooperators