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Fish Cliques: Evidence of Social Groups from Sparse Observations in Time and Space?

Jean V. Adams
August 02, 2016

Fish Cliques: Evidence of Social Groups from Sparse Observations in Time and Space?

Presented at Joint Statistical Meetings, 2 August 2016, Chicago, IL.

Jean V. Adams

August 02, 2016
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  1. Fish Cliques:
    Evidence of Social Groups
    from Sparse Observations
    in Time and Space ?
    USGS - Great Lakes Science Center
    Jean Adams,
    Stephen Riley, Taaja Tucker
    Michigan State University
    Charles Krueger,
    Thomas Binder

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  2. In Lake Huron,
    60,000 detections of
    250 tagged fish at
    30 stations
    Lake Trout

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  3. Same station:
    4 days
    Both observed:
    7 days
    Together:
    4 / 7 = 57%
    Unique stations:
    3
    Detections for one pair of fish

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  4. • Hypotheses
    • H0
    : seasonal movement patterns
    • HA
    : synchronized "group movement"
    • Identify groups that move together
    • together > 50% 11 pairs of fish
    • > 2 unique stations 17 individuals
    Detections for all pairs of fish

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  5. observed
    • Randomization
    • Add time shift from -3
    to +3 days to each fish
    • Identify groups
    • repeat 100 times
    • mean no. fish in
    groups: 10.7 (7, 18)
    • Groups we observed
    are what we would
    expect by chance
    • No evidence of "fish
    cliques"

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