Ruffed grouse drumming counts were conducted statewide along 103 survey routes during April and May 2011 (Figure 1). There was an average of 14.7 drums heard per route statewide. Highest drumming counts were in the Zone 1 (Upper Peninsula; 20.9), followed by Zone 2 (northern Lower Peninsula; 11.3) and Zone 3 (southern Lower Peninsula; 5.7; Fig. 1). Zone boundaries are shown in Figure 2.
In 2010, 106 survey routes were conducted statewide and paired t-tests were performed to statistically compare data from 97 routes run in both 2010 and 2011. Statewide there was a 20% increase (n=97; t=2.3; P=0.02) in the average number of drums heard per route between 2010 (12.5) and 2011 (15.0). Analysis at the regional scale indicated there was no significant difference (n=47; t=0.6, P=0.55) in the number of drums heard per route in Zone 2 (northern Lower Peninsula) between 2010 (10.8) and 2011 (11.6). However, there was about a 37% increase in the average number of drums heard per route in Zone 1 (Upper Peninsula) between 2010 (15.3) and 2011 (20.9; n=41; t=3.0, P=0.004). In Zone 3, there were 9 routes conducted in both 2010 and 2011. Due to the low sample size, statistical analysis at the Zone 3 regional scale is not appropriate.
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