On the Estimation of Averages Over Infinite Intervals with an Application to Average Persistence in Population Models  
  Authors: Sean Ellermeyer,  
  Keywords: Upper average, Lower average, Estimation of average value, Persistence, Average persistence, Non-autonomous population models, Chemostat.  
  Date Received: 18/05/2009  
  Date Accepted: 20/10/2009  
  Subject Codes:

26D15, 37B55, 92D25.

  Editors: Pietro Cerone,  

We establish a general result for estimating the upper average of a continuous and bounded function over an infinite interval. As an application, we show that a previously studied model of microbial growth in a chemostat with time-varying nutrient input admits solutions (populations) that exhibit weak persistence but not weak average persistence.;

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