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Loon Mortality in Michigan

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11=Type E Botulism. 12=Organochlorine Poisoning. 13=Boron Toxicity. 14=Hemorrhagic Enteritis ... Type E Botulism: 1. No Diagnosis: 3. Chicks: 9 deaths. Drowning: 1 ... – PowerPoint PPT presentation

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Title: Loon Mortality in Michigan


1
Loon Mortality in Michigan 1987-2004
Thomas M. Cooley Michigan Department of Natural
Resources Rose Lake Wildlife Disease Lab
2
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4
Loon Mortality Factors
Sources of Lead
1 with fish hooks 3 with fish hooks 1 with
monofilament line entanglement
  • Jig 22
  • Sinker 7
  • Unidentifiable lead pieces 5
  • Split shot 3
  • Lure (jig) 4
  • Spent lead shot 1
  • None seen 3

5

1Drowning 2Lead Poisoning 3Trauma 4Aspergillos
is 5Starvation/Malnutrition/Dehydration 6Mercury
Poisoning 7Neonatal Death/Hatching
Defect 8Pulmonary Congestion / Edema
9Abcess 10Visceral Gout 11Type E
Botulism 12Organochlorine Poisoning 13Boron
Toxicity 14Hemorrhagic Enteritis 15Pericarditis
16No Diagnosis
6
Total Loon Mortality (total204)
  • those that had a known collection location 168
  • Great Lakes 97
  • Inland lakes/rivers/sewage treatment lagoons 68
  • Either Great Lakes or Inland Lakes 1
  • On Land 2

7
Lead Poisoning 45 deaths
  • those that had a known collection location 38

8
Lead Poisoning 45 deaths
  • those that had a known collection location 38

9
Lead Poisoning 45 deaths
  • those that had a known collection location 38

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Jigs
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Jigs
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Jigs
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Jigs
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Unidentifiable Pieces of Lead
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Split-shot
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Loon Mortality Attributed to Lead Poisoning in
the Great Lakes
22
Drowning 46 deaths
  • those that had a known collection location 40
  • Great Lakes 34
  • Inland lakes/sewage treatment lagoons 6

23
Trauma 48 deaths
  • of those that had a known collection location 43

24
Loon Mortality by Age
25
Adults 148 deaths
  • Drowning 40
  • Lead Poisoning 30
  • Trauma 32
  • Aspergillosis 17
  • Starvation/Malnutrition/Dehydration 8
  • Mercury Poisoning 5
  • Abscess 1
  • Visceral Gout 1
  • Organochlorine Poisoning 1
  • Boron Toxicity 1
  • Hemorrhagic Enteritis 1
  • Pericarditis 1
  • No Diagnosis 10

26
Juveniles/Sub-Adults 47 deaths
  • Drowning 5
  • Lead Poisoning 15
  • Trauma 16 (Fish hooks-3)
  • Aspergillosis 4
  • Starvation/Malnutrition/Dehydration 1
  • Pulmonary Congestion/Edema 2
  • Type E Botulism 1
  • No Diagnosis 3

27
Chicks 9 deaths
  • Drowning 1
  • Neonatal Death/Hatching Defects 5
  • Starvation/Malnutrition/Dehydration 2
  • Pulmonary Congestion 1

28
Loon Mortality
Lead and Drowning Deaths (by Month and County)
Ray Rustem Natural Heritage Unit Supervisor
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Lead Poisoning Occurrences in Common Loons (Gavia
immer) in Michigan (1987-2004)
3
32
Drowning Locations of Common Loons (Gavia
immer) in Michigan (1987-2004)
1
1
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