Population trends of the Henslow's sparrow in relation to the Conservation Reserve Program in Illinois, 1975-1995
-
Published source details
Herkert J.R. (1997) Population trends of the Henslow's sparrow in relation to the Conservation Reserve Program in Illinois, 1975-1995. Journal of Field Ornithology, 68, 235-244.
Published source details Herkert J.R. (1997) Population trends of the Henslow's sparrow in relation to the Conservation Reserve Program in Illinois, 1975-1995. Journal of Field Ornithology, 68, 235-244.
Actions
This study is summarised as evidence for the following.
| Action | Category | |
|---|---|---|
|
Restore or create grasslands Action Link |
 |
-
Restore or create grasslands
A study in Illinois, USA (Herkert 1997), found that the population trends of Henslow’s sparrow Ammodramus henslowii in 1987-1995 were positively correlated with the proportion of the counties’ land in the CRP. Between 1975 and 1995 the Henslow’s sparrow population in Illinois declined by over 7% a year, but the three counties with the highest proportion of CRP land (7-9%) showed large (>50% a year) population increases. In total, Henslow’s sparrows were recorded in 27 of 102 counties.
)_2023 - Compressed.JPG)
