BLUE-GRAY GNATCATCHER

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Blue-gray Gnatcatcher
Copyright © 2005 Jerry Kumery

 Conservation Concern: NONE

Population Trend: Substantial Increase
Credibility: Moderate

The Blue-gray Gnatcatcher is an uncommon, but rapidly increasing, breeder in the CW Region.  It has expanded its range northward significantly during the past twenty years.  This species nests in a wide variety of habitats, but often in open areas areas of mixed trees and understory.

Trend Level

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1997-2004 Trend
 Point Count Data		 1988-2004 Trend*
 All Observation Types

*Data gathered using a assortment of sampling methods  - for casual inferences only
  Avg. Yearly
Rate of Change:

The vertical axis numbers represent an index of the population change.

Note that the scales may vary between graphs.

 Avg. Yearly
Rate of Change*:		  
  34%   12%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 104

Sample Size (Records): 71

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
4 to 63

  GOODNESS OF FIT:
Chi-square: 81.27, df 63, p 0.0605
Likelihood Ratio: 88.59, df 63, p 0.0185
AIC: -37.41
NOTE: (model fits if p values are above 0.05)

Download Table of All Observations

 
 

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Copyright © 2005 Audubon - Chicago Region & Bird Conservation Network

 
 
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