BOBOLINK

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Bobolink
Copyright © 2005 Eric Secker

 Conservation Concern: 6PIF, FW

Population Trend: Substantial Decrease
 Credibility: Good

The Bobolink is a fairly common breeder in northern portions of IL and IN, and northward.  Bobolinks usually breed in moist grasslands or open shrublands.  BCN eBird data shows a significant decrease of 6% a year in the CW Region.  Restoration efforts at some areas have proven to be very successful, but this species is still on the decline and also faces many threats on its wintering grounds in the southern hemisphere.

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*:		  
  -6%   6%  
   
   

 

 

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 1733

Sample Size (Records): 421

 

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-11 to -2

  GOODNESS OF FIT:
Chi-square: 590.24, df 320, p 0
Likelihood Ratio: 652.47, df 320, p 0
AIC: 12.47
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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