On a positive note, oligotrophic
lakes have low algal production and often have very clear waters with high drinking water quality.
However, this natural fertilization alternatively could be considered as an important source of energy in oligotrophic
systems, enhancing the productivity of the waters and creating conditions more favourable to the establishment of sustainable stocks of Chinook salmon and other resident salmonids such as brown trout and rainbow trout, favouring, in turn, the establishment of sports fisheries in the Palena River watershed.
Prospects for Phosphorus Recovery and Achieving Oligotrophic
(2015) for characterizing the productivity level in terms of CHL concentrations (mg [m.sup.-3]) within the study area: oligotrophic
waters (<0.084), lower mesotrophic waters (0.084-0.23), medium mesotrophic waters (0.23-0.46), upper mesotrophic waters (0.46-0.793) and eutrophic waters (>0.793).
Langlois et al., "Nitrogen and phosphorus co-limitation of bacterial productivity and growth in the oligotrophic
subtropical North Atlantic," Limnology and Oceanography, vol.
Planktonic and zoobenthic communities in an oligotrophic
, boreal lake inhabited by an endemic and endangered seal population.
Keywords: 16S rRNA; Gause's synthetic agar; Modified humid acid agar; Oligotrophic
media; Qin Mountain
Populations of microorganisms were determined in triplicate by the spread plate method using the following microbiological media: organotrophic bacteria--a medium with an addition of soil extract according to Bunt and Rovira (1955); oligotrophic
and copiotrophic bacteria a medium with a peptone and meat extract according to Onta and Hattori (1983); actinomycetes--Kuster and Williams medium with antibiotics (nystatine and actidione) (Parkinson et al.
Chl-a concentrations at most stations were categorized as oligotrophic
status except those at stations 8, 9, and 10 (mesotrophic status) and station 1 (eutrophic status) in the present study (Table 2).
Phytoplankton pigment composition and associated biochemical (chlorophyll a, nitrate+nitrite, ammonia, phosphate, silicate) and physical (temperature, salinity) parameters were studied seasonally in the river-fed eutrophic coastal and oligotrophic
offshore waters of the Mersin Bay located on NE Mediterranean.
In order to isolate the greatest number of species, we used two culture media: a copiotrophic medium composed of 2% malt extract, 2% agar and 0.2% CaC[O.sub.3] (MEAC) and an oligotrophic
medium of 0.2% CaC[O.sub.3] and 2% agar (CCOA).
A deep MLD corresponds to reduced mixing, lower nutrient availability in surface waters, and oligotrophic
conditions (Fiedler and Talley, 2006).