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The term “oligotrophic” is commonly used to describe terrestrial and aquatic environments with very low concentrations of nitrates, iron, phosphates, and carbon sources. [ 3 ] [ 4 ] Oligotrophs have acquired survival mechanisms that involve the expression of genes during periods of low nutrient conditions, which has allowed them to find ...
Cyclotella is a genus of diatoms often found in oligotrophic environments, both marine and fresh water. It is in the family Stephanodiscaceae and the order Thalassiosirales . [ 1 ] The genus was first discovered in the mid-1800s and since then has become an umbrella genus for over 100 different species, the most well-studied and the best known ...
Trichodesmium species are ubiquitous to oligotrophic tropical and subtropical aquatic environments that are known for deep light penetration, clear waters and a stable water column. [1] [2] A key feature to the genus is the presence of gas vesicles, which allow it to stay closer to the surface for photosynthesis. [2]
The Mediterranean Sea is generally oligotrophic with a strong west to east gradient of increasing oligotrophy; nutrients, chlorophyll-a concentrations, and rates of primary production all decrease from west to east. [50] [51] While most regions of the ocean are nitrogen-limited, the Mediterranean Sea is generally phosphorus-limited. [51]
Lake George, New York, an oligotrophic lake. The Trophic State Index (TSI) is a classification system designed to rate water bodies based on the amount of biological productivity they sustain. [1] Although the term "trophic index" is commonly applied to lakes, any surface water body may be indexed.
Oligotrophs are organisms that can live in an environment that offers very low levels of nutrients. Pages in category "Oligotrophs"
Competition specialists (predators, grazers, parasites) are expected to dominate in oligotrophic environments where competition is a large ecological constraint. [1] When competition specialists are found at uncharacteristically low abundances in oligotrophic environments, viruses may be responsible for moderating their population size.
In more oligotrophic environments, such as Station ALOHA, researchers believe that approximately 80% of the chlorophyll α biomass is due to cells in the pico-size range. [ 2 ] and picoeukaryotes are now known to make up a large fraction of the biomass and productivity in this size fraction in open ocean environments [ 10 ] and even in exported ...