DICKCISSEL

SPECIES INDEX  |  HOME    

Dickcissel
Steve Maslowski / USFWS

Conservation Concern: 5PIF, WL-Y, FW

Population Trend: Substantial Decrease
Credibility: Very Good

The Dickcissel is a locally fairly common breeder in the CW region and a common breeder in more rural areas to the south and west.  Preferred habitat includes grasslands with mixed forbs and abandoned weedy fields.  BBS trends indicate sizeably significant annual decreases due to loss of habitat and threats on its wintering grounds in the southern hemisphere.  BCN eBird data indicates that this species has declinded very significantly in the Chicago area   This species may be severely negatively impacted by grassland restoration efforts and mowing and burning of nonnative weeds, but more research is urgently needed.

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*:
 
  -46%   0%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 243

Sample Size (Records): 96

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-59 to -34

 GOODNESS OF FIT:
Chi-square: 264.41, df 92, p 0
Likelihood Ratio: 217.31, df 92, p 0
AIC: 33.31
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