BLACK-CAPPED CHICKADEE

 SPECIES INDEX  |  HOME    

Black-capped Chickadee
Copyright © 2005 Eric Secker

 Conservation Concern: NONE

Population Trend: Decreasing
 Credibility: Good

The Black-capped Chickadee is a common breeder in the CW Region.  They are cavity nesters that are frequently found in many woodland habitats, both coniferous and deciduous.  BCN eBird data indicates that this species is declining in our area.  Note the sudden drop in 2003 which may be a result of the spread of West Nile Virus.

Trend Level

Interpreting the Data | Analysis Methods | Disclaimer | Contact Us

 

 
   
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*:		  
  -5%   -2%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 740

Sample Size (Records): 398

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-15 to 4

  GOODNESS OF FIT:
Chi-square: 430.33, df 335, p 0.0003
Likelihood Ratio: 449.20, df 335, p 0
AIC: -220.8
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

 
 
HOME  |  SPECIES INDEX  |  INTERPRETING THE DATA  |  ANALYSIS METHODS  |  DISCLAIMER  |  CONTACT US
     
  Site designed by - Piazza Design