SAVANNAH SPARROW

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Savannah Sparrow
Copyright © 2005 Eric Secker

Conservation Concern: NONE

Population Trend: Substantial Increase
Credibility: Very Good

The Savannah Sparrow is a fairly common to common breeder in the CW Region, uncommon to rare further south.  Breeding habitat includes dry grasslands, moist grasslands, and abandoned fields.  This species is fairly well monitored by the BCN Census and has increased substantially in preserved areas, despite declining BBS trends for Illinois during the same periods.

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*:
 
  10%   7%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 730

Sample Size (Records): 336

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
2 to 18

 GOODNESS OF FIT:
Chi-square: 361.00, df 290, p 0.0029
Likelihood Ratio: 393.51, df 290, p 0
AIC: -186.49
NOTE: (model fits if p values are above 0.05)

Download Table of All Observations

 

 

Project Affiliates and Sponsors:

Copyright © 2005 Audubon - Chicago Region & Bird Conservation Network

 

 
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