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Effects of mass extinction on community stability and emergence of coordinated stasis with digital evolution

LUO Tiantong;Gabriel YEDID;College of Life Sciences,Nanjing Agricultural University;  
[Objectives]The phenomenon of coordinated stasis is an extension of punctuated equilibria,which describes the long-term stability of multi-species communities. The research based on digital evolution is significant for understanding the phenomenon and its mechanism more fully. [Methods]In this study,we used digital evolution and multiple data analyses to investigate the effects of different mass extinction treatments on the emergence of coordinated stasis and community stability at different levels in controlled experimental settings that are based on cross-feeding. [Results]The main results indicated: 1) Most of the control communities kept stable during long periods of time in community organization without disturbance; 2) Community stability at eco-phenotypic levels had significant negative correlation with extinction intensity; 3) The stability we found in"time shift invasion trials"was different from the relatively high stability at eco-phenotypic levels; 4) Results of the fitness change of community members supported fitness-deterioration interpretation of"Red Queen": any evolutionary advance in one member will entail a loss of fitness in others; 5) Stasis we observed from the results was largely uncoordinated. [Conclusions]The effects of different mass extinctions we demonstrated in this study are helpful for better understanding of multi-agent evolutionary systems involving multiple biotic interactions among community members.
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