AMERICAN COOT

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American Coot
Copyright © 2005 Eric Secker

 Conservation Concern: NONE

Population Trend: Poorly Known
Credibility: Poor

The American Coot is a fairly common breeder in marshes and vegetated lakes.  This species is poorly sampled by the BCN Census due to the fact that point counts are often centrally located in the middle of fields or woodlands, not along marshland edges.

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*:		  
  296%   5%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 25

Sample Size (Records): 12

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-152 to 745

  GOODNESS OF FIT:
Chi-square: 22.85, df 15, p 0.0874
Likelihood Ratio: 13.83, df 15, p 0.5385
AIC: -16.17
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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