Santa Fe 2001 breakout group: Simple to complex (Rob P, Mike, Penny, Juergen L, Bob J, Jennifer)
We decided that there are at least two social transitions: from solitary to social, and the loss of reproductive potential, or the transition from hierarchical to distributed organization
Defining a social group
Social phenotypes include nest construction, reproduction, defense, nutrition, brood care
Sociality may not include all of these, but congregations for one behavioral goal are not sufficient.
"If you are together just to reproduce you are not social, and if you are together just to eat you are not social, but if you are together to eat and reproduce you are social"
Step 1 incipient social groups
Prerequisites
Reduced dispersalnot emigrating/dispersing
Toleranceallowing other individual to be there
Sample a common stimulus environment
(variation in initial sensitivity or positive feedback loop?)
Mechanisms
Direct or indirect interaction effects
Effect of behavior on environment
Cues from pre-existing products or behaviors
Direct physical/chemical interactions
Consequent attributes
Differentiation in behaviortask specialization
Group cohesion or clustering
Mass action behaviors
Step 2: simple to complex social groups
We use group size increase as an independent variable
Possible emergent Consequences:
Loss of totipotency
Sophisticated communication
Complex nest structure
Increased individual specialization
Increased modularity
Distributed control (via hierarchical control)
Selection induced consequences
Reduction of conflict at inter- individual level
Convergence of interests between reproductive and nonreproductives
Evolved signals
The two main questions:
What is the minimum set of emergent and adaptive properties at the transition from solitary to social, and from simple to complex?
What are the minimal individual behavioral changes necessary for these transitions?
Some relevant hypotheses:
The transition from simple to complex societies involves a transition from emergent
dominance to hierarchical to distributed control
Hierarchy is a mathematical consequence of dominance with increasing n
The absence of hierarchy in simple (communal) groups may be because the groups are
compositionally ephemeral
The emergence of social structure involves the emergence of 3 general properties:
behavioral differentiation (including specialization, dominance and parasitism),
group cohesion and mass action behaviors