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GREAT BLUE HERON

The Great Blue Heron is a locally common statewide breeder. Breeding habitat usually consists of isolated stands of trees (living or dead) on islands or in undisturbed open areas near water. This species has increased noticeably during the past twenty years. BCN trends show declines, but marshlands and heron rookeries are poorly monitored by the BCN Survey. Data we have collected from Lake Renwick and other heron rookeries shows a more substantial annual increase. Photo: © Eric Secker

GREAT BLUE HERON  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

    Annual Change Pct. Error      
  None Noted   135   658   Mod.   -6% +/-9%      

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Uncertain

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1999-2007 TREND - Point Counts

 

 

 

 

 

 

 

 

GREAT BLUE HERON

 

 

 

 

    Goodness of Fit
Chi-Square: p= 0.0001
     

 

 

 

 

 

 

 

 

Fails

 

 

 

    model fits if p >0.05 (model
estimate is not significantly
dif. from observed counts)
     
           

 

     
Copyright © 2008 Audubon - Chicago Region & Bird Conservation Network