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. Author manuscript; available in PMC: 2015 Jan 22.
Published in final edited form as: Nature. 2013 Apr 10;496(7445):355–358. doi: 10.1038/nature12071

Figure 1. Yeast populations with a tipping point: an experimental system to study collapse of connected populations.

Figure 1

a, Isolated yeast populations collapse after crossing a tipping point. The distribution of population density around equilibrium is shown in spread points; the red square denotes the mean. Insets are traces of replicate populations at dilution factor 1000 (stable) and 1700 (collapsed), y-axis unit: cells/µl. b, Yeast populations are spatially connected by controlled daily dispersal. Each circle corresponds to a habitat patch where a local population grows. A fraction of the local population is transferred to each of its two nearest neighbors, and the rest to itself.