SEDGE WREN

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Sedge Wren
Copyright © 2005 Eric Secker

 Conservation Concern: 6PIF

Population Trend: Substantial Decrease
 Credibility: Very Good

The Sedge Wren is an uncommon breeder in the CW Region.  Breeding habitat includes moist grasslands with mixed forbs, marsh edges, and abandoned weedy fields.  Short-term trend estimates indicate that this species has declined at an alarming rate during the past eight years.  Long-term trends may be inaccurate due to a substantial increase in the amount of data gathered on this species in 2003 and 2004 during the Grassland Birding Blitz.

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*:		  
  -29%   9%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 171

Sample Size (Records): 102

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-42 to -17

  GOODNESS OF FIT:
Chi-square: 213.64, df 164, p 0.0055
Likelihood Ratio: 186.17, df 164, p 0.1132
AIC: -141.83
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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