2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
9/28/2018 | 11:25 AM - 11:40 AM | Designing a Large-Scale Survey for Spruce Grouse in Minnesota | Eccles Conference Center Auditorium
Designing a Large-Scale Survey for Spruce Grouse in Minnesota
Minnesota is unique in the Great Lakes Region in having a hunted spruce grouse population. Spruce grouse exist at the southern edge of their range in Minnesota and are expected to experience habitat loss due to climate change. Yet, we have sparse data on spruce grouse distribution and no data on population size or trends. Data collection began in 2014 to develop survey methodology for spruce grouse in Minnesota. We examined 2 possible survey methods along road-based points, broadcast of a cantus call and a pellet-based survey. Spruce grouse responses to the cantus call were more frequently detected earlier in the day, earlier in the broadcast period, and earlier in the season, but detection rates were too low to track population trends. Pellet surveys along circular transects centered on call survey points (i.e., 100 m radii) had 5 times the apparent detection rate of call surveys in 2014 and were more flexible in implementation. In 2015, we refined our methodology to increase detection, added a study area to include both peripheral and central portions of the distribution, and conducted pellet and call surveys at paired points on and off roads. We concluded that a pellet-based survey may overcome the practical limitations of call-based surveys and provide a regularly repeating index to spruce grouse populations. In 2016, we piloted a road-based pellet survey at a large scale. In 2018, we launched a large-scale, cooperator-based annual survey to track population trends and changes in distribution.
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Presenters/Authors
Charlotte Roy
(), Wildlife Populations and Research Group, charlotte.roy@state.mn.us;
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John Giudice
(), Minnesota Department of Natural Resources, john.giudice@state.mn.us;
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Chris Scharenbroich
(), Minnesota Information Technology Services, chris.scharenbroich@state.mn.us;
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