VESPER SPARROW

 SPECIES INDEX  |  HOME    

Vesper Sparrow
Copyright © 2005 Jerry Kumery

 Conservation Concern: NONE

Population Trend: Poorly Known
Credibility: Very Poor

The Vesper Sparrow is a rare breeder in urban areas of the CW Region, becoming fairly common towards the collar counties.  Breeding habitat includes dry grasslands, abandoned fields, and agricultural areas.  This sometimes difficult to detect species is poorly sampled by the BCN Census and accurate trends cannot be calculated.

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*:		  
  -18%   1%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 5

Sample Size (Records): 4

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-108 to 71

  GOODNESS OF FIT:
Chi-square: 8.92, df 4, p 0.0632
Likelihood Ratio: 6.74, df 4, p 0.1503
AIC: -1.26
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