Una súplica por las abejas - Dennis van Engelsdorp
1. A Plea For Bees
and other Pollinators
Dennis vanEngelsdorp
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12. Symptoms of CCD
Symptoms of CCD
•Absence of dead bees
Absence
•When bees present
•Appear young
•Queen right
•Insufficient brood cover
I ffi i t b d vanEngelsdorp, et. al (2009) PLOSone
•Lack of/delayed robbing or common Williams, Tarpy, vanEngelsdorp et. al (2010)
comb pests BioEssays
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15. Proposed
Causes of CCD
C. V
• Cell Phones
C ll Ph
Vorsek
• Rapture
• Terrorist
• Russian plot
Russian plot
16. Top Lines of Investigation
Top Lines of Investigation
1. Pathogen
1. New
2. Newly evolved
Newly evolved
2. Pesticide
1. Beekeeper applied
2.
2 Farmer applied
li d
3. Environmental stress
1. Nutrition
2. Genetics
3. Management
17. Sample Collection
p Yard Type Colony type
Strong
N
9
Control Weak 6
Strong 24
Weak 30
CCD Dead 14
Recovering 6
Package added 8
Package installed 3
18. CCD vs. non-CCD yards
M t lit 20 8 % vs 8 1%
Mortality 20.8 8.1%
Odds Ratio:
weak-weak 205 dead-
weak weak 205, dead dead 109
vanEngelsdorp, et. al (2009) PLOSone
20. Higher levels in CCD
Non-CCD
Non CCD colonies
Pathogens
•DWV, KBV
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•2.6 X more likely to have both
nosema species
•~2 X more likely to be infected with
3 or more viruses
CCD
vanEngelsdorp, et. al (2009) PLOSone
21. Non-CCD
Non CCD
CCD
Higher levels in control
colonies
Pesticides
•Coumaphos
•wax and brood
wax
•Esfenvalerate
•Wax
•Honey bee tracheal mites vanEngelsdorp, et. al (2009) PLOSone
22. CLASSIFICATION AND REGRESSION TREE ANALYSIS
N = 91
56.7%
56 7% CCD
Coumaphos in bee brood ≤ 66 ppb oumaphos in bee brood > 66 ppb
C
N = 58 N = 33
67.2% CCD 36.4% CCD
Fluctuating asymmetry Fluctuating asymmetry
≤ 1878.5 > 1878.5
N = 40 N = 18
85.0% CCD 27.8% CCD
Tree Sensitivity = 65 %
Tree Specificity = 87 %
vanEngelsdorp, et. al (2010) J. Ec.Ent
