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

Feb 07, 2023 •516 likes •1.68k views

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

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  54. 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

  75. 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

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