Similarly, a "price" for being a generalist relative to the specialist phagotroph is expressed by:
Such "prices" may be the extra expenses for a phagotroph invested in production of photosynthetic pigments, or the sacrifice of parts of the surface area for phagotrophic purposes in an otherwise osmotrophic organism.
This gives two qualitatively different phase planes, one [ILLUSTRATION FOR FIGURE 2A OMITTED] where the mixotroph is predominantly an osmotroph and a competitor to the bacteria (i.e., when [Mathematical Expression Omitted]), and one [ILLUSTRATION FOR FIGURE 2B OMITTED] where it is predominantly a phagotroph and a predator to the bacteria (i.e., for [Mathematical Expression Omitted]).
How good must a mixotroph be in uptake of dissolved mineral nutrients in order to "beat" a specialized phagotroph with its assumed superior affinity for the common prey [Mathematical Expression Omitted]?
This is the case when the phagotroph incorporates only a small fraction of the mineral nutrient contained in the prey , i.e., when the phagotroph is an efficient remineralizer.
lakes inevoluta, Trachelomonas raciborskii Codon Tolerance Sensitivities Y low light phagotrophs
[L.sub.m] very low C mixing, poor stratification light J -- settling into low light [W.sub.2] high BOD grazing [W.sub.2] unknown unknown Table 2.
Bay scallops are thought to accomplish essentially all digestion extracellularly within the digestive-gland lumen (Reid, 1982); oysters, on the other hand, are considered to be phagotrophs
Chrysophycean flagellates comprise a wide range of nutritional modes, ranging from chloroplast-bearing obligate phototrophs to nonpigmented phagotrophs. Intermediate mixotrophic forms are able to combine phototrophic nutrition with the uptake of particulate or dissolved organic material.
Furthermore, these trade-offs are likely to affect the competition and coexistence between mixotrophs and obligate phototrophs or phagotrophs (Rothhaupt 1996).
However, similar to obligate phagotrophs (e.g., Jurgens and Gude 1990), Ochromonas released SRP when phagotrophy was relatively more important.
Competition between mixotrophic flagellates and obligate phagotrophs for mineral nutrients is analogous.
Chemostats are ideal model systems to study interactions among algae, bacteria, and phagotrophs. In nutrient-limited mixed chemostats, algae and bacteria compete for the uptake of the limiting nutrient (Currie and Kalff 1984).