EASTERN TOWHEE

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Eastern Towhee
Copyright © 2005 Jerry Kumery

Conservation Concern: NONE

Population Trend: Increasing?
Credibility: Mod. Good

The Eastern Towhee is an uncommon to fairly common breeder in the CW Region and fairly common in patchy regions further to the south.  Breeding habitat usually includes forest edges or moderate to dense shrublands.  Both trends indicate that this species is increasing, but a more generalized analysis of the avg. number of birds record per site shows a notable decrease if an apparent oversampling in 2000-2004 is taken into account.  BBS trends show this species declining at a rate of -1.3% annually in the midwest and -1.2% annually in Illinois.

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*:
 
  16%   1%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 196

Sample Size (Records): 136

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-1 to 32

 GOODNESS OF FIT:
Chi-square: 175.16, df 150, p 0.0784
Likelihood Ratio: 173.33, df 150, p 0.0933
AIC: -126.67
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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