PRE-WORK & SELECTING THE DESIGNATED MONITORING AREA (DMA). Stratify to Riparian Complex. By an ID Team Delineate the Complex Document the Rationale Purpose and objectives Type of Complex (representative, reference, critical) Description Select the most sensitive complex
Nongrazed highway unit
Narrow V-shaped valley
Broad V-shape or narrow u-shape in colluvial valleys
3 Kinds of DMAs:
When the monitoring objective is to assess management effects over time, both a representative DMA and reference DMA might be used.
If the monitoring objective is to assess management effects on a value, such as cutthroat trout habitat, a critical DMA might be established in a complex where spawning or some other critical life history requirement is concentrated
Select a Random Starting Point: Randomly locate the starting point (lower end) of the DMA within the selected complex
The stream segment length should be at least 110 meters or 20 times Greenline-greenline width whichever is greatest (>110 m when stream is > 5.5 meters wide)
Livestock have access to the DMA
The riparian complex most sensitive to management influences
DMA has the potential to respond to measurable trends in condition resulting from changes in management
Not located on reaches impervious to disturbance if bank/channel disturbance if a monitoring purpose
DMAs are not located at locations intended for livestock concentration (such as along fences or in water gaps where livestock grazing use is not representative of the riparian area)
DMAs are not located in areas compounded by activities that make it difficult to establish cause-and-effect relationships (eg adjacent to a campground)
Which complex is the most sensitive to grazing effects?
Where should it be located in that complex?
BLM - Scotchman Creek – cutthroat trout
Representative - Critical
Ephemeral stream with no livestock use –NOT a good DMA
Or dominated by rock larger than cobble in size
Heavy timber – no livestock use –Not a good DMA
No – not a perennial stream and no livestock use!
No – unavailable to livestock
Sheep Allotment in non-use during the past 6 years -
Is a reference DMA
No – site is a water gap
Yes, to compare effects of grazing using an exclosure as an initial reference
Yes – site meets all criteria
Not for grazing since recreation impacts compound grazing effects. This could be a good site to monitor ORV impacts on the streambanks & channel – works as a CRITICAL DMA
Its Here, Why?
This is the only spawning reach in the pasture – a “critical” reach.
Develop a plant list and record species codes for the site. The Data Entry Module contains a complete list of plant species codes and a worksheet for recording plant codes applicable to the DMA. Also refer to the plants table in Appendix H for appropriate plant species codes.