GRASSHOPPER SPARROW

Grasshopper Sparrow
Copyright © 2005 Eric Secker

Conservation Concern: 5PIF, FW

Population Trend: Increasing?
Credibility: Mod. Good

The Grasshopper Sparrow is an uncommon to fairly common breeder in the CW Region and fairly common in regions to the south. Although BBS trends show this species as decreasing significantly in Illinois at a rate of -7.0% annually, BCN eBird trends show a notable increase in the CW Region. These discrepancies may represent differences in trends between roadside populations that are threatened by development and populations in preserved areas that are fairly well protected.

Trend Level

Interpreting the Data | Analysis Methods | Disclaimer | Contact Us

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*:

14%

Technical Notes (1997-2004 Trend)

Sample Size (Indiv.): 258

Sample Size (Records): 169

AVG. YEARLY RATE OF CHANGE:
(including standard error)
-2 to 30

GOODNESS OF FIT:
Chi-square: 250.41, df 215, p 0.0491
Likelihood Ratio: 234.12, df 215, p 0.1767
AIC: -195.88
NOTE: (model fits if p values are above 0.05)

Download Table of All Observations

Project Affiliates and Sponsors:



1997-2004 Trend Point Count Data	1988-2004 Trend* All Observation Types