fire ants, crazy ants & zombie ants · tawny crazy ant nylanderia fulva 1890 1950 2002 no...
TRANSCRIPT
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Produced by and for Hot Science - Cool Talks by the Environmental Science Institute. We request that the
use of these materials include an acknowledgement of the presenter and Hot Science - Cool Talks by the
Environmental Science Institute at UT Austin. We hope you find these materials educational and enjoyable.
Dr. Rob Plowes
October 26, 2018
Fire Ants, Crazy Ants
& Zombie Ants
Hot Science - Cool Talk # 115
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Rob Plowes
Fire Ants, Crazy Ants and Zombie Ants
Photo Credit: A Wild
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Fire Ants, Crazy Ants and Zombie Ants
Image Credit: Zazzle.com
Rob Plowes
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Zimbabwe
– my home
You are hereZombie
home range
Zombie
staging
grounds
Zombie
invasion
zone
Zombie invasions from Old to New World
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N. Webinger
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• Advanced social organization
• Colonies have Queens and sterile workers
• Communicate – by pheromones, sounds, touch, odors
• Fire ant larvae serve as the centralized digestive system.
Ants are Superorganisms
Photo Credit: L Gilbert
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Source: Lekhnath Kafle
Fire ant larvae are the centralized digestive system
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Queen with larvae attended by workers
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Ants as super-organisms
Raft of fire ants survives flooding
Emergent properties of ant colonies- Cooperation
- Building nests
- Group foraging
- Group defenses
Challenging invasive species!
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1980’s - Fire ants invade the field station 1983
1986
100m0
50
100
5 10 15% b
aits
occ
up
ied
Ant species (common to rare)
Uninfested AreaUninfested area
Infested area
0
50
100
5 10 15% b
aits
occ
up
ied
Ant species (common to rare)
Infested AreaFire ants
Brackenridge Field Lab
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You are here
Fire ant
home range
Invasion
zone
Fire ants invasions
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1st occurrence in county
Center for Environmental Regulatory Information Systems does not certify to the accuracy or completeness of this map.
1st occurrence in county
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Schmidt Pain Index of Insect Stings
Bullet ant (4+)
Like fire-walking over flaming charcoal with a 3-inch rusty nail grinding into your heel.
Photo Credit: Hillewaert
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Schmidt Pain Index of Insect Stings
Tarantula hawk wasp (4)
Blinding, shockingly electric. A running hair drier has been dropped into your bubble bath.
Photo Credit: NPS/Robb Hannawacker
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Schmidt Pain Index of Insect Stings
Harvester Ant (3)
Bold and unrelenting. Somebody is using a drill to excavate your ingrown toenail.
Photo Credit: D Ward
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Schmidt Pain Index of Insect Stings
Acacia ant (1.8)
A rare, piercing, elevated sort of pain. Someone has fired a staple into your cheek.
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Schmidt Pain Index of Insect Stings
Fire ant (1.2) Sharp, mildly alarming. Like walking across a shag carpet and reaching for the light switch.
Photo Credit: L Gilbert
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Problem ants in Texas
Argentine Ant Linepithema humile
Red Imported Fire Ant Solenopsis invicta
Tawny Crazy AntNylanderia fulva
1890 1950 2002
No stinger Stinger No stinger
Photo Credit: AntWeb
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• $ 1.2 billion/year economic damage in Texas
• 80 million acres of rangeland infested
Red imported fire ants – Solenopsis invicta
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• Impact on ground nesting birds and animals
• Disruption of food web: loss of species, pollinators
Red imported fire ants – Solenopsis invicta
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Source: Joe McGowan
Tawny Crazy Ants – Nylanderia fulva
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Tawny Crazy Ants – Nylanderia fulva
• Major invader of urban areas along Gulf Coast
• Spread by human transport
• Extremely high densities
• Knock out native fauna
• Displace fire ants
Photo Credit: L Gilbert
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Chemical Warfare -Crazy Ants vs Fire Ants
L Gilbert
Fire ant venom
Crazy ant -formic acid gland
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Why do some species become invasive?
• Enemy escape hypothesis (competitors, parasites, pathogens)
• Fast growth & reproduction
• Good at dispersal
• Associated with disturbance
Red imported fire ant
Brown tree snake
Photo Credit; AntWeb
Zebra mussels Kudzu vines
Photo Credit: Kerry Britton
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• Multiple queens -“polygyne”
• Clonal spread
• Low aggression between nests
• High densities of colonies
• Dominant competitors – “top dogs”
Traits of invasive ant species
Tropical Fire Ant (Texas native)
Photo Credits: AntWeb
Red Imported Fire Ant
Antenna
Eye
Antenna
Eye
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Monogyne⁻ Single queen colony⁻ Large, isolated nests ⁻ Territorial⁻ 120 mounds/acre⁻ Isolation creates a “social immune”
defense against diseases
Polygyne⁻ Multiple queens per colony⁻ Small nests⁻ Interconnected network⁻ Up to 800 mounds/acre⁻ Disease risk from foreign workers
Social forms of fire ants
Nest
Boundary
Supercolonies
of connected
nests
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It’s a Supergene!
Odor detection disabled
B
b
Monogyne BB- workers recognize nest mates- single queen
Polygyne Bb- workers can’t distinguish nest mates- multiple queens
Odor detection normal
supergene
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Post WWII – The Power of Science
Nuclear energy, penicillin and DDT
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Comments about the 1957 Federal campaign to eradicate fire ants from 20 million acres using dieldrin and heptachlor ….
“It is an outstanding example of an ill-conceived, badly executed and thoroughly detrimental experiment in the mass control of insects, an experiment so expensive in dollars, in destruction of animal life, and in loss of public confidence in the Agriculture Department that it is incomprehensible that any funds should still be devoted to it.”
Silent SpringRachel Carson, 1962
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Biological control
Opportunities to use natural enemies- should be host specific- self-sustaining after release- low future costs
Concerns- unforeseen collateral damage - host-shifting after introduction- may only have low impacts
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Natural enemies of ants
Carpenter ants
• Live in trees, forage on the ground
• Become infected with fungal spores
• Develops seizures and begins a zombie walk
• Descends to ground, climbs a plant
• Bites down and dies
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• Pics of cordyceps
D. Newman
Ophiocordyceps fungus turns carpenter ants into zombies
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J. Abbott
Pseudacteon phorid flies: Parasites of fire ants
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BBC
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Source: National Geographic
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Image Credit: E. Economo
Phorid fly
larva
Ant jaws
Ant neck
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• Ants feed in high numbers, emit a foraging pheromone.
L Gilbert
• Native ants gain food,fire ants lose out!
• Phorid flies detect and attack.
• Ants go into alarm mode, go home
Flies disrupt fireant feeding
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Zombie defenses
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Flies disrupt mound defenses
Loss of young reduces colony growth rate
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Potential for biocontrol with phorid flies
• Direct effects - may kill up to 3% of workers
• Indirect effects – up to 50% reduction in gathering food
• Decreased nest defenses – loss of workers and brood
• Possible vectoring of pathogens by flies
Slower colony growth, stronger native ant community
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2005
2009
2010
2011
2006
Release and dispersal of phorid flies
Pseudacteon obtusus
• Many release sites
• Rapid spread
• Self-sustaining populations
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Monitoring fly populations
Ants enter container
Flies get trapped
in paper
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Fra
ction o
f baits w
ith f
ire a
nts
Potential biocontrol success?Brackenridge Field Station
0.0
0.2
0.4
0.6
0.8
1.0
Ap
r-0
1
Jan
-04
Oct
-06
Jul-
09
Ap
r-1
2
Dec
-14
Sep
-17
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Summary
• Zombie ants are real
• Invasive ants pose a complex
challenge for biocontrol
Funding: Lee & Ramona Bass Fdn, Robert &
Helen Kleberg Fdn, Ecolabs, TPWD, USFWS
Acknowledgements: Larry Gilbert, Ed LeBrun,
Pat Folgarait, Nathan Jones, Sanford Porter, UT
Fire Ant Lab team, USDA, Landowners
J. Abbott