. Management plan and conservation strategies for sage grouse in Montana - final . Sage grouse; Sage grouse; Habitat conservation; Wildlife management; Birds; Bird populations. Reproduction Fall productivity ratios were determined from examination of wings of grouse taken by hunters (Eng 1955, Table III-2). Findings from research in central Montana suggested that years with chick survival of juveniles/hen in only four of 41 years (Table III-2). The median chick survival was juveniles/hen during this 41-year period. Years in which productivity was > juveniles/hen were followed
. Management plan and conservation strategies for sage grouse in Montana - final . Sage grouse; Sage grouse; Habitat conservation; Wildlife management; Birds; Bird populations. Reproduction Fall productivity ratios were determined from examination of wings of grouse taken by hunters (Eng 1955, Table III-2). Findings from research in central Montana suggested that years with chick survival of juveniles/hen in only four of 41 years (Table III-2). The median chick survival was juveniles/hen during this 41-year period. Years in which productivity was > juveniles/hen were followed by increased numbers of males/lek the following spring 76 percent of the time (16 of 21 years, Tables III-1 and III-2). If productivity was < juveniles/hen, there was a decrease in the lek count during the following spring 63 percent of the time (12 of 19 years). Thus, a threshold value for chick survival at a broad scale that would coincide with short-term population changes, reflected by numbers of males attending leks, probably would occur closer to the 41 year median of juveniles/hen (Table III-2). Sage Grouse Lek Counts vs. Harvest 1958-2003. 1958 1963 1968 1973 1978 1983 1988 1993 1998 2003 Year Figure III-2. Trends in sage grouse lek counts and harvest in Montana, 1958-2003. The amount and timing of spring and summer rainfall affects annual production and population dynamics of sage grouse, causing short term fluctuations (, < 10 years) in sage grouse abundance (Eustace 2002). Wallestad and Watts (1973) identified weather-related factors that affected sage grouse productivity in central Montana. Their findings included: 1. No relationship between productivity and rainfall during the hatching period (peak second week of June); Section III 31. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original
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