social structure stability instability
Download
Skip this Video
Download Presentation
Social Structure: stability/instability

Loading in 2 Seconds...

play fullscreen
1 / 15

ture: stability/instability - PowerPoint PPT Presentation


  • 240 Views
  • Uploaded on

Social Structure: stability/instability. WFSC 422 Ethology Presentation 6.1. Dr. Jane M. Packard, WFSC TAMU [email protected] Territories vs. dominance. Territories Intense combat between SEVERAL groups defense of space- group home range group access to resources Dominance

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'ture: stability/instability' - erika


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
social structure stability instability

Social Structure: stability/instability

WFSC 422 Ethology

Presentation 6.1

Dr. Jane M. Packard, WFSC TAMU [email protected]

territories vs dominance
Territories vs. dominance
  • Territories
    • Intense combat between SEVERAL groups
    • defense of space- group home range
    • group access to resources
  • Dominance
    • Minor conflict among individuals in ONE group
    • defense of personal distance
    • individual access to resources
swans in group out group
Swans- “in group” “out group”
  • In group- stable hierarchy
    • family- parents & offspring
    • no turnover in membership
    • each learns what to expect from others
  • Out group- contest of strength
    • family groups gather on lake during migration
    • contests between families over resources
    • bigger, stronger families win over singles & smaller families
social structure 3 hypotheses
Social Structure- 3 hypotheses
  • In stable groups, conflict is predictable
    • e.g. pecking order in chickens
  • In unstable groups, conflict depends on friends & rivals
    • e.g. appeasement & grooming in baboons
  • In social insects, castes are fixed (nutrition)
    • no conflict e.g. Leaf cutter ants
stable chicken peck order
Stable- chicken “peck order”
  • Alpha- 1 hen pecks all others
  • beta- “second in command”
    • pecked by alpha
    • pecks all others
  • omega- “bottom of hierarchy”
    • pecked by all others
    • does not peck back
  • stability depends on order of entry into group- younger new ones are pecked
baboons age affects stability
Baboons- age affects stability
  • Females
    • youngest daughter supported by mother
    • older daughters drop in rank
  • males
    • leave mother’s group, enter a new group
    • form alliance with females, appease males
    • rise in rank as older males weaken or die
ant castes hard wired roles
Ant castes- “hard wired roles”
  • Diploid (fertilized)- females
    • largest- reproductive queen
    • large- soldiers
    • small- workers (brood care, foragers)
    • dependent on nutrition at a critical stage of development
  • haploid (unfertilized)- males
    • produced near the end of queen’s life
    • mate (3-4 with one queen), then die
summary
SUMMARY
  • Distinguish between out-group intense combat (e.g. defense of territory) and in-group mild conflict (e.g. hierarchy)
  • 3 hypotheses of social structure
    • Stable groups => predictable conflict
    • Unstable groups=> friends & rivals change
    • Social insects=> castes fixed by nutrition
action items
Action Items
  • Do answers for Q6.1, Q6.2
  • Search idealibrary for “social structure”
  • Search Animal Behavior for “dominance”, “hierarchy”
  • Post examples and sources on WebCT Discussion for Unit 6
ad