MARSH WREN

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Marsh Wren
Copyright © 2005 Eric Secker

 Conservation Concern: NONE

Population Trend: Poorly Known
 Credibility: Mod. Poor

The Marsh Wren is an uncommon to fairly common breeder in the CW Region.  Breeding habitat includes marshes with tall, dense cattails or reeds.  Birds are usually found in small colonies.  This marshland species is not adequately sampled by the BCN Census.

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*:		  
  -17%   7%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 69

Sample Size (Records): 31

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-50 to 16

  GOODNESS OF FIT:
Chi-square: 57.71, df 34, p 0.0068
Likelihood Ratio: 53.10, df 34, p 0.0195
AIC: -14.9
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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