7], it has the capacity of high environmental and exceptional ability to adapt in different environmental conditions, for this the Hydrilla can thrives in environmental conditions varying from lentic to lotic, eutrophic to oligotrophic
, acid to alkaline, with high to low light availability, and tropical to temperate climate  and it is possible to grow up in environments where the salinity (five salinity of sea water) more than 7 ppm  it is an important plant that's grows in a variety of aquatic situations: in static water, in water flowing up to 1.
The trophic state of the reservoir varied from oligotrophic
, in the dry period, to mesotrophic, when the reservoir was full, according to the Kratzer and Brezonik index (Kratzer & Brezonik 1981).
Lake trophy conditions changed from oligotrophic
in the early Boreal to mesotrophic by the middle Atlantic and to the start of fen peat formation and fill-in at the end of the Atlantic.
australis shoot tissues indicates N limitation in the lake and on the seashore on Paljassaare (N/P ratio 7-11), in the Kasari River delta (N/P ratio 8), and in the Vaike Vain Strait (N/P ratio 12), but P limitation in the oligotrophic
Lake Tanavjarv (N/P ratio 21).
The plankton of oligotrophic
oceans, for example, is often dominated by the biomass of heterotrophs, notably bacteria and colorless protozoans (Cho and Azam 1990), and so is the plankton of unproductive lakes (del Giorgio and Gasol 1995).
Differences in N:P ratios between oligotrophic
and eutrophic lakes may reflect sources of biogeochemical inputs, according to Downing and McCauley (1992).
Thus, the potential for competition between snails and tadpoles may be particularly strong in oligotrophic
streams like Hart's Run and Overall's Creek.
However, such a feeding strategy would seem inefficient in the oligotrophic
habitats where these animals live, since arm flexure requires considerable muscular involvement and might result in a net energy loss.
Several physical and chemical factors (such as light, temperature and nutrients) could regulate bacterial growth; in particular, temporal nitrogen depletion might favour oligotrophic
ultramicrobacteria such as LD12 Alphaproteobacteria, the most abundant and ubiquitous freshwater bacterial lineages (Salcher, 2014).
Phosphorus enrichment and light availability sustain the pelagic chlorophyll a and primary production, while in oligotrophic
lakes phytoplanktonic growth and production are frequently constrained by nutrient limitation (Carpenter et al.
Objectives: To restore and conserve the following habitats and species of community importance in the Natura 2000 area of Vijvergebied Midden-Limburg ( Pond area M-L ): bittern (Botaurus stellaris); tree frog (Hyla arborea); oligotrophic
waters ; oligo- to mesothrophic standing waters; wet and dry heath; and hydrophilous tall herb fringe communities;
Achnanthidium minutissimum tolerates conditions that range from oligotrophic
to eutrophic (VAN DAM et al.