Sin embargo, para futuros trabajos vale la pena tener en cuenta que la riqueza de tardigrados puede depender de la humedad y la calidad del aire, de tal manera que los ambientes cercanos a centros urbanos pueden poseer bajas riquezas de tardigrados (GLIME
The largest variability in fluorescence parameters within this group of bryophytes most likely reflects differences in the water retention capacity of individual species (Glime
, 2007) or particular microenvironmental conditions.
, J 2006 Bryophyte Ecology: Physiological Ecology Estados Unidos: Michigan Technological University 593 p.
However, the transition from open water to fen and from fen to bog can also be satisfactorily attributed to autogenic internal processes such as lake-fill, clogging of drainage by fine organic detritus and acidification by means of cation exchange in mosses (Glime
et al., 1982; Wetzel, 1983; Crum, 1988).
Liverworts, in contrast, are relatively shade tolerant (Glime
and Vitt 1984), and Conocephalum frequently grows in shady regions of the river.
About seven or eight years ago, Jim Carlson, a sales representative for Pomp's Tire, told Pomp's retread technician Mike Glime
that there was a special need for a traction tire for the graders used by Alger County.
Local or individual accounts of peatlands in the region include sites in southern Michigan (Crow 1969a,b; Sytsma & Pippen 1981, 1982; Glime
Bryophytes play an important role in many freshwater ecosystems, both as primary producers and as microhabitats for aquatic organisms (Glime
and Clemons 1972, Glime
and Acton 1979, Slack 1984).
, an ecologist at Michigan Technological Univ., Houghton, and Tracy Abildskov, a research assistant at Brigham Young Univ., Provo, UT, had been using image analysis systems for several years before they started using the Mocha system.
Watson 1980a, 1981a, Vitt and Slack 1984, Rydin 1986, 1987, Glime
and Vitt 1987).