Biology of the Colony
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Transcript of Biology of the Colony
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Biology of the Colony
Dr. Deborah Delaney
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Eusociality
Photograph © Alex Wild 2004
Photograph © Alex Wild 2003
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Eusocial: True Sociality
Found mainly in two orders:
Hymenoptera (some bees and wasps,
all ants)
Isoptera (all species)
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Eusocial Insects Features (by definition):
1. Overlap of generations
2. Division of labor (Caste system) – not all individuals reproduce
3. Cooperative rearing of young
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Eusocial Insects May also show
• Trophallaxis (Ritual feeding)
• Complex chemical communication (pheromones)
• Nest – Often with controlled
atmosphere
• Specialized reproductive biology – Production of new colonies vs.
production of new individuals
• Rare (2% of species), but highly successful (some tropical areas >3/4 of biomass)
Trophallaxis - a way of exchanging food and chemical messages
Termite nests
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Eusociality
• Some individuals
reduce their own
lifetime reproductive
potential to raise the
offspring of !others
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How did eusociality evolve?
• Mystery: not in an individual’s self interest to give up
reproducing!
Different theories: Controversial Hamilton (1964): kin selection (inclusive fitness)
• Haplodiploid reproduction (all Hymenoptera, also
eusocial thrips)
•Kin selection refers to apparent strategies in evolution that
favor the reproductive success of an organism's relatives, even
at a cost to their own survival and/or reproduction.
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They’re of the same blood:
The importance of relatedness
• Sisters are more related to each other than they
are to their own mother or father
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• Group selection
– Formation of a group
– Persistence and cohesion of the group, defensible
nest
– Spreading eusocial alleles
– Spreading of others traits that favor the group
– Natural selection acting on a group
How did eusociality evolve?
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Mechanisms of Social Organization
Social organization by social insects was long
held as an example by the aristocracy and
various religions as a model to how human
societies should be organized
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Mechanisms of Social Organization Centralized
• Following a leader
• Using a plan, blueprint
or recipe
• Using a template or
mould
http://www.fatherlovesaj.com/leader%20logo.jpg
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Insect societies are well organized, but
how do they achieve this?
Proverbs 6: 6-8- “Go to the ant thou sluggard: consider her ways, and be wise.
Which having no guide, overseer of ruler, provideth her meat in the summer,
and gathereth her food in the harvest”.
In insect societies no one is in charge.
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Mechanism of Social Organization Self –organization or
De-centralized
• Global pattern of organization arises from
the interactions of many individuals whom
follow simple rules in response to local
conditions. No one individual is in charge.
• Ex: cells in a multicellular organism,
grains of sand in a sand dune, social insect
colonies
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Activity
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In what ways can
sociality benefit
insects?
Margy Nelson
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Insect sociality
• Benefits of sociality:
– Utilization of large and more diverse resources
– Group defense against predators
– Existence as perennial, long-lived organisms
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“Super-organism”
• Intake resources
• Waste disposal
• Defense
• Reproduction
• Environmental control
They use social design to solve ecological problems normally faced by single organisms- origin of the concept of “super-organism”
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Who are the bees
in your colony?
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X X
Unfertilized eggs
1n 1n
Fertilized eggs
2n 2n
Fertilized eggs
2n 2n
Sex determination
X
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Sex Determination
• If an egg is heterozygous at the sex loci= Become a female
• If an egg is homozygous at the sex loci the individual will be a diploid drone
• If the egg is unfertilized (therefore haploid) the individual will become a viable haploid drone
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Mating genetics
Basic Biology
Spermatheca full of stored sperm (actually about 17 drones)
(actually 4-7 million sperm)
= Leads to a number of subfamilies in the colony
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Basic Biology
Colony genetics Leads to a number of
subfamilies in the colony
6 subfamilies present in this
hive
1
1
2
2
4
3
5
6
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Haplodiploidy
• Haplodiploidy: Viable drones come from unfertilized eggs, females from fertilized eggs
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Biology of the Colony
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Swarming
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Colony fission: natural swarming Splitting is managerially equivalent to swarming: the natural process by which colonies reproduce
~50% workers & parental queen
Swarming has been shown as an acquired evolutionary technique that reduces pests and diseases within honey bee populations Occurs in mid to late spring when bee populations are high and flowering is more intense
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• Location dependent on
amount of available
cavities and the ability to
thermoregulate
Photo Joseph Nicolay
A Cavity nester
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Thermoregulation
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Current Apis species distribution
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Pollination
Bee-dependent crops account for $47.1
billion every year, of which $14.6 billion
is attributable to honey bee pollination
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Communication
• Honey bees are eusocial
• Prof von Frisch discovered their
communication basics
• A bee discovers a food source….
she returns home to tell her sisters
where it is, how far, & how good !
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Round Dance
Quick short steps
in narrow circles
On beeswax comb
Food close
Odor & taste clues
Richness clues
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Wagtail Dance
Bee makes ½
circle, straight
run while waggling
Abdomen then ½
circle again
Distance
Direction
Odor & taste clues
Richness clues
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Wagtail Dance
From Gould & Gould 1988
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Taste and smell
• The number of
dancing bees and
the frequency of
dance can relay
quality and
quantity of
resource
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Dialects
• Different subspecies have different variations of the dance
• Different dances for different distances
• Different subspecies have trouble communicating location to one another
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Colony Communication
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Pheromones of the Queen Honey Bee
Queen substance (QMP) mandibular glands
Foot-print pheromone Arnhart (tarsal) glands
Tergal pheromone Tergite glands
(abdominal)
Feces pheromone Hindgut
Egg marking pheromone Dufor’s gland?
Queen attractant scent Koschevnikov gland
Queen cell pheromone immature queen / cell
Pheromone Source
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Queen Substance
Source: Mandibular glands
Primary component:
9-oxo-trans-2-decenoic acid
Mixture of 5 compounds; blend important
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QMP
• Virgins and mated
queens have different
QMP profiles
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• Queens with more
mates have more
attractive QMP profile
QMP
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Queen Substance Dispersal
Queen pheromone
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Retinue Formation
• Mandibular gland
pheromone complex
– Mixture important,
single components do
not have activity
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Queen Inhibition of Queen Rearing
• Queen mandibular gland complex- major
inhibitor (exception)
• Additional pheromone from tergite glands may
help suppress queen rearing
• Possible “fecundity” signal from young brood
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Inhibition of rearing replacement queens
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Sex attraction
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Swarm Stabilization
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Stimulation of foraging/brood rearing
R. Williamson photo
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Participates in suppression of worker
ovaries
Queen Worker
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Egg Pheromone
o Queen produced
Function: discrimination of
queen-laid versus worker-
laid eggs
Aid to worker policing of
worker-laid eggs
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Queen Cell Pheromone
Present on queen pupae:
methyl linoleate, methyl
linolenate, methyl oleate
Functions:
• Recognition of queen cells
• Serve as part of a feed-back
control system governing the
production of queen cells
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Worker Pheromones
• Orientation – nasonov gland
Mixture of 7 terpenoids: E- & Z- citral, nerol, nerolic acid,
geraniol, geranic acid & farnesol
scenting R. Williamson photo
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Worker pheromones
• Orientation
• Alarm
– worker mandibular gland
• 2 heptanone
– worker sting gland
• Iso-pentyl acetate
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Worker Pheromones
• Orientation
• Alarm
• Trail pheromone
• Brood pheromone
• Beeswax comb
• others
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Hive Odor
Guard bee
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Age based polyethism
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Division of Labor in Worker Bees
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Colony Requirements
• Nectar
• Pollen
• Water
• propolis
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From Nectar to Honey
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From Nectar to Honey
• Nectar is 80% water,
whereas honey is only
19% water
• To make 1 pound of
honey, a colony of bees
collects nectar from over
1 million flowers
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