I disagree. In looking through the most recent
Dall Sheep Management and Harvest Report, a number of very precise metrics are laid out as management objectives. Some of these are specific numbers of sheep, some are very specific annual harvest numbers, some are specific sheep age thresholds, and so forth. Though there are some fuzzy lines here (like maintaining an aesthetically pleasing sheep hunting experience), others are very tangible and clear.
Unless these objectives have changed since this most recent report was published, and I am sure some have, the Department has very clear and measurable objectives with respect to Dall sheep. These are exactly the sort of data that are used to determine whether or not there is a biological concern. Granted, some interpretation of the data might be necessary, for example if a "sustainable annual harvest of 60 rams" is not met, it's incumbent on the area biologist to try to figure out why. Possible answers could be hunter access due to weather issues, sheep movement patterns, and of course a reduced sheep population due to predation, disease, other biological factors, predation, and hunting. This is what biologists do.
In order to avoid a massive "text blast" like I did when proving resident preference in our hunting regulations, I cut my notes short in the following list of specific management objectives. You could look up the rest; there are very clear and measurable metrics for almost every sheep population in the state.
For what it's worth (and I hope it's worth something to someone out there), here are the standards ADFG uses in many of our sheep populations:
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Kenai Mountains: No management objectives stated.
Alaska Range West: Management objective: average harvest of 78 full curl rams.
Wrangell Mountains, East of the Copper River: Management objective: sustainable annual harvest of 60 rams.
Chugach Mountains: Management objectives: to provide a quality hunting experience, to provide the opportunity to take a trophy class ram in the central Chugach, to provide sustainable subsistence hunting opportunity in eastern Chugach. Recommended long-term harvest objectives of 20 rams in western 13D, 30 rams in east-central 13D, and 8 rams in the TCUA.
Mentasta, Nutzotin, and northern Wrangell Mountains: Management objective: maintain the Dall sheep population. Goal modified to maintain a harvestable population of sheep fluctuating within historical limits of abundance and the carrying capacity of their habitat.
Tok Management Area: Management objective: to provide Dall sheep hunters additional opportunity to harvest large-horned, trophy rams, maintain a population that produces a harvest of 30-45 rams with mean horn sizes of at least 36 inches and greater than 8 years, maintain an average of at least 7% rams with 40-inch or greater horns in harvest, prevent unacceptable increases in hunter concentration and maintain the existing aesthetically pleasing qualities associated with sheep hunting in the TMA.
Talkeetna Mountains and Chulitna-Watana Hills: Management objectives: Provide the greatest opportunity to participate in hunting sheep, provide an opportunity to view, photograph, and enjoy sheep (within the Sheep Mountain Closed area in GMU 13A), maintain sheep populations that will sustain an annual harvest of 75 rams.
Delta Controlled Use Area: Management objectives: Provide aesthetically pleasing hunting conditions by managing hunter numbers, hunter access, and transportation means, annual harvest of 35 full-curl rams with a mean horn length of more than 36 inches and an age exceeding 8 years.
Chugach Mountains (GMU14C): Management objective: Maintain a minimum harvest of 30 full-curl or larger rams, while providing aesthetically pleasing hunt conditions and avoid overcrowding of hunters in the field.
GMU 20A (north Alaska Range): Management objectives: manage for a Dall sheep population of approximately 5,000 sheep, maintain an average harvest of rams greater than 8 years old, provide the opportunity for hunters to harvest mature rams during a general hunting season.
White Mountains area: Management objective: manage for the annual opportunity to harvest full-curl rams from a population of at least 250 Dall sheep.
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...and so on (that's only about half of what's in the report).
There are many very clear, objective management goals and standards by which Dall sheep hunting opportunity and numbers can be measured. I am not saying that the system is perfect, or that anyone knows exactly how many sheep we have out there. What I am disagreeing with is your claim that the Department has no threshold by which a biological concern could be documented, and upon which harvest limits could be dictated. We do have those tools, and they have been used specifically for that purpose.
-Mike