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 - - 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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Ted Swem

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Ted Swem

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Ted Swem

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Female Loon Unit (FLU) equivalent (ug/g, ww)

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

Chicks fledged / Territoril pair

0.00 0.20 0.40 0.60 y = -0.0294x + 0.4802 r2 = 0.86

Common Loon – reproductive effects now shown in New England and eastern Canada

  • A. Recent findings from a 10-year

study indicate sig. relationship between increasing Hg levels and:

  • 1. Physiological changes
  • 2. Abnormal behavior
  • 3. Survival
  • 4. Reproductive success
  • B. Some areas of the Northeast

contain population sinks because

  • f Hg

Evers et al., 2008, Ecotoxicology 17:69-82

LOAELs Blood = 3.0 ppm (ww) Feather = 40 ppm (fw) Egg = 1.3 ppm (ww)

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Red = Marked at Colville River Delta Yellow = Marked at Cape Espenberg Green = Marked at Yukon-Kuskokwim Delta Blue = Marked at Copper River Delta Red-throated Loon migration

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Ted Swem

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Ted Swem

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#36404, Fall 2002 #36404, Fall 2003

9/17 9/17-9/23 9/27 10/3-10/20 10/30-11/23 10/24 12/12 12/16 11/26-11/29 9/20 9/23-9/28 10/1 10/5 10/12-10/25 10/28 11/07-11/17 11/20 11/24-12/01 12/10-4/19 Banded 7/4 Departed 9/17 Banded 7/4 6/5-9/16

Yellow-billed Loon

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12/10-4/19 4/23 5/06 5/13 5/23 5/26 5/29 5/16-5/19 6/5-9/16

#36404, Spring 2003

Yellow-billed Loon

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