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Figure 64. Average anuran index value during the second survey period at Camp Ripley, 1993-
2009. Surveys were not conducted during the second survey period in 2005 and 2008.
Average Index Value per Stop
3
2.5
2
1.5
1
0.5
0
AHATS Birds
Songbirds
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
As a natural oasis in a mostly metropolitan area, AHATS provides important breeding
and migratory habitat for bird species in greatest conservation need (SGCN). Thirty-six SGCN
birds have been identified on AHATS; including both breeding and migratory species (Appendix
J). Nineteen SGCN birds including waterbirds, raptors, and songbirds are known to breed on
AHATS; five were recorded during songbird point count surveys this year.
Songbird surveys were conducted on 13 permanent plots (Figure 65) on May 29, 2009.
Surveys have been conducted on these plots since 2001. A total of 119 birds consisting of 35
different species were recorded. The average number of birds per plot was 9.15 and the average
number of species per plot was 7.69 (Table 18 and Figure 66). More than 25 SGCN, including 20
bird species, have been identified on AHATS (MNDNR 2006). Trends of three grassland
songbirds that are SGCN are presented in Figure 67.
Page 95
Year
Spring Peeper American Toad Gray Treefrog Cope’s Gray Treefrog
2009 Conservation Program Report