the status of the bees dr. frank drummond school of biology and ecology & cooperative extension...
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The Status of the Bees
Dr. Frank DrummondSchool of Biology and Ecology & Cooperative
ExtensionUniversity of Maine
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bee diversity• Worldwide – 20,000 species• U.S. – 2,500 species• Florida, Arizona – 700 species• New York – 450 species• Massachusetts – 350-400• Maine – 275 species
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where do we stand…honeybees
Maine brings in almost 85,000 colonies per year just for wild
blueberry!
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Three Maine research projects on
honeybees since 2009
W a sh ing to n
O re go n
A riz on a
N ew M e x ic o
Texas
O kla h om a
K an sa s
C olo ra do
U tah
N ev ad a
C alifo rn ia
Idah o
M o ntan a N orth Da ko ta
S ou th Da ko ta
N eb ra sk a
M in ne so ta
Iowa
M iss ou ri
A rka n sa s
Mississippi Alabama
Louisiana
F lo r ida
G eo rg ia
Te n ne ss ee
W is co ns in
Ill ino isInd ian a
O hio
M ich ig an
Ke ntu ck y
New Jersey
N ew York
Conn.R.I.
Mass.
N.H.
Maine
W yo m ing
P en ns ylv an ia
Virginia
VirginiaWest
DelawareMd.
Vt.
Carolina
North Carolina
South
Olym pia
Boise
Helena
Salt Lake City
Pierre
Cheyenne
Lincoln
St. Paul
Des Moines
Madison Lansing
Harrisburg
Trenton
Providence
Hartford
Concord
Albany
Montpelier
Augusta
Carson City
Phoenix
Santa Fe
Denver
Oklahoma City
Austin
Jefferson City
Little Rock
Jackson
SpringfieldIndianapolis
Nashville
Montgomery
Frankfort
Columbus
Charleston
Tallahassee
Columbia
Atlanta
Richmond
Raleigh
Dover
Annapolis
Boston
W a s h i n g t o n , D . C .Topeka
New YorkChicago
Miami
Philadelphia
Detroit
Houston
Dallas
Seatt le
Las Vegas
Los Angeles
San Francisco
Sacramento
Memphis
New Orleans
St. Louis
BatonRouge
SalemBismarck
1. National stationary hive project (2009-2013)
2. Effect of fungicide propiconazole (2011-2013)
3. Health of honeybee colonies on Maine blueberry barrens (2014-2015)
1.
2.
3.
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spring 2009 – spring 2013 colony losses (all trials and all sites, n = 442 colonies)
• 2009 - 2013 colony loss relative risk
Year*** P = 0.0006Apiary site*** P < 0.0001Varroa*** P < 0.0001
Varroa x site*** P = 0.0003Nosema** P < 0.007
Nosema x site* P = 0.021IAPV* P = 0.054
4.9
2.1
1.3
W a sh ing to n
O re go n
A riz on a
N ew M e x ic o
Texas
O kla h om a
K an sa s
C olo ra do
U tah
N ev ad a
C aliforn ia
Id a h o
M o ntan a N or th D a ko ta
S ou th D a ko ta
N eb ra sk a
M in ne so ta
Io w a
M iss ou ri
A rka n sa s
Mississippi Alabama
Louisiana
F lo r ida
G eo rg ia
Te n ne ss ee
W is co ns in
Ill ino isIn d ian a
O hio
M ich ig an
Ke ntu ck y
New Jersey
N ew York
Conn.R.I.
Mass.
N.H.
Maine
W yo m ing
P en ns ylv an ia
Virginia
VirginiaWest
DelawareMd.
Vt.
Carolina
North Carolina
South
Olym pia
Boise
Helena
Salt Lake City
Pierre
Cheyenne
Lincoln
St. Paul
Des Moines
Madison Lansing
Harrisburg
Trenton
Providence
Hartford
Concord
Albany
Montpelier
Augusta
Carson City
Phoenix
Santa Fe
Denver
Oklahoma City
Austin
Jefferson City
Little Rock
Jackson
SpringfieldIndianapolis
Nashville
Montgomery
Frankfort
Columbus
Charleston
Tallahassee
Columbia
Atlanta
Richmond
Raleigh
Dover
Annapolis
Boston
W a s h i n g t o n , D . C .Topeka
New YorkChicago
Miami
Philadelphia
Detroit
Houston
Dallas
Seatt le
Las Vegas
Los Angeles
San Francisco
Sacramento
Memphis
New Orleans
St. Louis
BatonRouge
SalemBismarck
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effect of intensive agriculture?
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factors that affect colony loses
• Varroa destructor (1986)• Nosema ceranae (1990)• Viruses – new and old• Overall geographic location (weather, forage)• Pesticides – acute, but also subtle sublethal effects
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what’s new and emerging?
ZOMBIE BEES (2012)
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how are the wild bees?• species declines• exotics ?• species shifts• species rebounds
A. Dibble
very, verydifficult to measure !
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another factor that makes it difficult
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declines HAVE been documented around the globe
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Declines in the Northeast…
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Historical trends in Maine
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Colla and Packer 2008, images: Xerces Society, Sam Droege
rusty patchbumble bee
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the decline of the yellow banded bumble bee in Maine
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2013 survey for the yellow banded bumble bee,
Bombus terricola
Observed and confirmed
NOT observed
1. survey sites in Maine (n=29 confirmed)
2. percent occurrence = 13.8 % (n=29)
3. relative abundance = 2.4% (n=18), compared to 1-2% from 2009-2012.
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2014 survey for the yellow banded bumble bee,
Bombus terricola
Observed and confirmed
NOT observed
1. survey sites in Maine and New Brunswick (n=87 confirmed)
2. percent occurrence = 49.4 % (n=87) 0% in NH 2014 survey (9 locations, n = 1349 bees collected, Rehan data)
3. relative abundance = 7.4% (n=18), compared to 1-2% from 2009-2013.
4. occurrence vs Bombus richness, ns (P = 0.13, n=18)
Reported, but NOT confirmed
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2015 survey for the yellow banded bumble bee,
Bombus terricola
Observed and confirmed
NOT observed
1. survey sites in Maine and New Brunswick (n=52 confirmed)
2. percent occurrence = 61.5 % (n=52)
3. relative abundance = 11.5.4% (n=32), compared to 1-2% from 2009-2013.
4. occurrence vs Bombus richness, ns (P = 0.08, n=32)
Reported, but NOT confirmed
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factors affecting declines
• climate change?• habitat fragmentation and shrinking habitat• pesticides• pathogens & parasites
– native pathogens and new stressors– exotic new pathogens?
• genetic diversity (bees – low diversity due to breeding system and inbreeding)
• exotic bees – competition ?
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pesticidesbumble bees in Maine
Kalyn BickermanPhD Student
University of Maine School of Biology and Ecology
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bumble bees and imidacloprid revisited (2013 & 2014)
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parasites and disease
• native
• exotic … aka SPILLOVER
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a native bumble bee pathogen
Fungal pathogenNosema bombi
Spread through spores
Prevalence species-dependentN. Bombi spores, 1000X. Bickerman, 2012
Bickerman and Drummond, unpublished data
No effect - commercial bumble beesBushmann et al. (2013)
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spill-over of pathogens from honey bees to native bees?
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pathogen spill-over?
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why the honey bee?
• Only bees (and a few aphids) make honey• Honey bee stores large quantities of honey• Stingless bees also store honey in Australia,
Asia, Africa and Central and South America• In the U.S. ?
Amy Campbell