Social Feedback and the Emergence of Leaders and Followers

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Presentation transcript:

Social Feedback and the Emergence of Leaders and Followers Jennifer L. Harcourt, Tzo Zen Ang, Gemma Sweetman, Rufus A. Johnstone, Andrea Manica  Current Biology  Volume 19, Issue 3, Pages 248-252 (February 2009) DOI: 10.1016/j.cub.2008.12.051 Copyright © 2009 Elsevier Ltd Terms and Conditions

Figure 1 Transition Intensities from the MCMC Model Transition intensities (best estimate and 95% CI) for leaving and returning to cover, for runs during the main experiment with (A) transparent and (B) opaque partitions. The area in which fish were covered by weed is shown in gray, the exposed area in white. The bold fish and associated transitions and intensities are shown in red, the shy fish and associated transitions and intensities in blue. Length and thickness of arrows is scaled according to transition intensity. Note that during opaque runs, a simplified model in which fish did not respond to one another's movements (B) gave the best fit; the transition intensities for this model are denoted b+ and b− for the bold fish and s+ and s− for the shy fish. The area of each arrow is proportional to the magnitude of the relevant transition intensity. Below each diagram of transitions, we show an illustrative set of results from one pair: time runs from left to right, periods during which the bold fish was out of cover are indicated by red shading, and periods when the shy fish was out are in blue. For the transparent treatment illustrated in (A), results for both fish are juxtaposed to highlight synchrony. Current Biology 2009 19, 248-252DOI: (10.1016/j.cub.2008.12.051) Copyright © 2009 Elsevier Ltd Terms and Conditions

Figure 2 Effect of Individual's Temperament on Transition Intensities Log-linear effects (best estimate and 95% CI) of (A) bold and (B) shy fish-temperament scores on the transition intensities (βij denotes effect of bold fish temperament on qij; σij denotes effect of shy fish temperament on qij). The bold fish and associated transitions and effects are shown in red, the shy fish and associated transitions and effects in blue. Thick solid arrows represent significant positive effects on a transition, thick empty arrows represent significant negative effects, and slim arrows (without coefficients) represent nonsignificant effects. The area of each arrow is proportional to the magnitude of the relevant effect. Current Biology 2009 19, 248-252DOI: (10.1016/j.cub.2008.12.051) Copyright © 2009 Elsevier Ltd Terms and Conditions