Ed:
If 'apparent' is based on observations in which a species' original distribution has been reduced in a substantial manner, this is a reasoned manner to arrive at a tentative opinion. Such circumstantial information can be grounds to perform a more formal assessment. However, wildlife agencies that list species in any category of concern without following science-based processes are acting in an unprofessional manner to say the very least. I do not believe that any university with a program in wildlife science advocate and condone the use of anecdotal information (appearances) as if such were fact in order to assess, list ,and manage species.
Perhaps the Wisconsin wildlife agency has done its homework and determined the percent habitat loss to the Ringneck Snake which thus warrants the listing of 'special concern'. I have no problem if that is the case. I do have a problem with any wildlife agency that assesses and lists species in some category of concern using anecdotal information and processes -- such as what seems to be 'apparent'.
So to return your favor, let me tell you a story about the Wisconsin Wildlife agency that deals with raptor biology. This account was published in either the N. Am. Falconers Assn. Hawkchalk publication or the organization's Annual so my general comments can be checked although I am not going to try and find that article as it was a number of years ago that it appeared. The author of that article was the individual that researched the species for his MS or PhD thesis project.
It is my understanding that at one time, the Cooper's Hawk was listed in some special category by Wisconsin's wildlife agency as it was common knowledge the species was scarce to rare in the state. I believe this was the opinion of some academics as well.
Along comes a grad student that proposed that his thesis involve a study of the Cooper's Hawk and particularly its reproductive biology in that state. As I recall, the grad student was warned about the scarcity of the species by biologists and/or his advisors who tried to disuade him from pursuing the project as it surely would prove to be a waste of time and effort and thus a dead end project.
As he has been warned, for considerable time (I believe well over a year) he came up with negligible results. Then things began to change as he gained field experience. To make a long story short, what seem 'apparent' to many, much to their dismay, the researcher discovered that instead of being rare, the species was one of the more numerically abundant medium size raptors in Wisconsin--as it probably is in many states.
There is a lesson to be learned by those with an open mind. Appearances, (that which seems to be 'apparent'), impressions, and perceptions are very frequently faulty because such notions are not based on factual information plus they fail to take into account the biological nature of certain species. Much to the Wisconsin Wildlife Agency's credit, if I have my facts right, they removed the Cooper's Hawk from whatever list it had been on in the state.
To this day, ask birders and wildlife biologists (not knowledgeable about raptors) and almost to the person they will tell you that the Red-tailed Hawk is more abundant than the Cooper's Hawk. They do so because their observations of the two species make this 'fact' apparent to them. But would you be surprised that such 'apparent' opinions are in error.
I believe either in Winconsin, Michigan, or Minn., there are annual fall migratory raptor counts. Check the yearly data from those counts and others across the nation then tell me which species is more numerous, the Red-tailed Hawk or Cooper's Hawk?
This same scenario has many parallels where herps are concerned. Species that have appeared to be rare, once studied in a science based manner, have been found to be common to abundant. When I was an undergraduate in Wildlife Science in the early 1950's, it was conventional wisdom amongst herpetologists that the Rubber Boa was rare. That (erroneous) perception persists amongst many today. I was in Utah and Nevada this past week and two individuals related to me their recent experience with biologists in their respective states which had expressed that perception. Just like the Cooper's Hawk, the Rubber Boa is a shy, secretive species which only produces an appearance of being 'rare' when in fact it is probably the most numerically abundant species in the much of the habitat it occupies in the Western U.S.
Richard F. Hoyer Corvallis, Oregon