BLUE-WINGED TEAL

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Blue-winged Teal
Copyright © 2005 Eric Secker

 Conservation Concern: NONE

Population Trend: Poorly Known
Credibility: Poor

The Blue-winged Teal is an uncommon to fairly common breeder in the CW Region.  The sample size for this species is somewhat small, but this species appears to be increasing in recent years.  This species is poorly sampled by the BCN Census which does not adequately monitor marshland birds.

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*:		  
  106%   -3%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 46

Sample Size (Records): 24

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-30 to 241

  GOODNESS OF FIT:
Chi-square: 59.02, df 28, p 0.0005
Likelihood Ratio: 49.87, df 28, p 0.0067
AIC: -6.13
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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