Ted Swem Ted Swem Ted Swem Common Loon reproductive effects now - PowerPoint PPT Presentation

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Ted Swem Ted Swem Ted Swem Common Loon reproductive effects now shown in New England and eastern Canada A. Recent findings from a 10-year study indicate sig. relationship 0.60 between increasing Hg levels and: Chicks fledged / Territoril

Ted Swem
Ted Swem
Ted Swem
Common Loon – reproductive effects now shown in New England and eastern Canada A. Recent findings from a 10-year study indicate sig. relationship 0.60 between increasing Hg levels and: Chicks fledged / Territoril pair 1. Physiological changes 0.40 2. Abnormal behavior 3. Survival 4. Reproductive success 0.20 y = -0.0294x + 0.4802 B. Some areas of the Northeast r2 = 0.86 contain population sinks because 0.00 0.1 - 0.5 0.5 - 1.0 1.0 - 1.5 1.5 - 2.0 2.0 - 2.5 2.5 - 3.0 3.0 - 3.5 >3.5 of Hg Female Loon Unit (FLU) equivalent (ug/g, ww) LOAELs Blood = 3.0 ppm (ww) Feather = 40 ppm (fw) Egg = 1.3 ppm (ww) Evers et al., 2008 , Ecotoxicology 17:69-82
Red-throated Loon migration Red = Marked at Colville River Delta Yellow = Marked at Cape Espenberg Green = Marked at Yukon-Kuskokwim Delta Blue = Marked at Copper River Delta
Ted Swem
Ted Swem

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