Oligotrophy: the forgotten end of an ecological spectrum.
This value, however, was close to the upper limit of
oligotrophy (<45).
Oligotrophy and nitrogen fixation during Eastern Mediterranean sapropel events.
Data did not match the assumptions for the [chi square]-test for swamps and
oligotrophy at a distance of 250 m from built-up areas.
A range between 30-50 is usually associated with the mesotrophy (moderate productivity); index values greater than 50 are associated with eutrophy (highly productivity); values less than 30 are associated with
oligotrophy (low productivity).
In some circumstances these communities are highly enriched in Helianthemetea guttatae com panion species, namely in situations of great
oligotrophy and/or very shallow soils where Poa bulbosa has not reached its maximum dominance or does not have conditions to develop.
Most species with ECY are tropical; extra energy reserves may buffer planktotrophic larvae against the
oligotrophy conditions of tropical waters, In lecithotrophic species, ECY may be a response to selection for post-settlement fitness benefits of larger offspring (Marshall el a!., 2003, 2006).
reduction in nutrient loading would result in
oligotrophy. However, it
According to different classifications [32, 33] the total phosphorus and total nitrogen values from Lake Paajarvi and Lake Paijanne reflect mainly
oligotrophy and mesotrophy.
In lake succession, productivity and photosynthetic efficiency increase from
oligotrophy to a prolonged eutrophic stage-equilibrium and decline with lake senescence, rising again in the terrestrial stages of hydrarch succession.
Species found in the caatinga are all strongly tolerant of
oligotrophy, but we do not know whether species differ in their abilities to persist when nitrogen supply reaches its lowest extremes.
The eastern tropical Pacific Ocean encompasses areas of upwelling and
oligotrophy (Fiedler and Talley, 2006), and this oceanographic variability produces diverse zooplankton prey assemblages (Fernandez-Alamo and Farber-Lorda, 2006).