Use the following terms to fill in the blanks above given the gradient: Cyanobac

Question

Use the following terms to fill in the blanks above given the gradient:

Cyanobacteria (oxygenic phototroph)

anoxygenic phototroph

aerobic heterotroph

fermenting heterotroph

iron oxidizer

iron reducer

sulfate oxidizer

sulfate reducer

nitrate reducer (denitrification)

ammonia oxidizer (nitrification)

nitrogen fixer

autotroph

methanogen

methanotroph

halophile or halotolerant

psychrophile or psychrotolerant

themophile or thermotolerant or hyperthermophile or mesophile

acidophile or acidotolerant

alkaliphile or alkalitolerant

obligate anaerobe

facultative anaerobe

Given the following physicochemical gradient, and your knowledge of metabolism, describe the most likely community composition. Light, oxygen Organic molecules Light, no oxygen H2S, organic molecule No light, no oxygen Sulfate Fe3+ Organic molecules ure 1.23

Explanation / Answer

In section A, I would expect the most common species to be Cyanobacteria (oxygenic phototroph), aerobic heterotroph. One of these functional groups is an autotroph, which can fix CO2, providing additional organic molecules to the community. In section B, I would expect the most common species to be anoxygenic phototroph, fermenting heterotroph, and that they would have the following tolerance of oxygen sulfate reducer or halophile or halotolerant. In section c, I would expect ammonia oxidizer (nitrification) and nitrate reducer (denitrification) species to be common because they can use the organic molecules as electron donors, and the indicated inorganic molecules as electron acceptors.

Cyanobacteria (oxygenic phototroph) and aerobic heterotroph will out number others in presence of oxygen, light and organic molecule. Anoxygenic phototroph and fermenting heterotroph will be high in no oxygen, H2S, light and organic environment following tolerance of oxygen sulfate reducer or halophile or halotolerant. Anaerobic ammonia oxidation will grow more ammonia oxidizer (nitrification) and nitrate reducer (denitrification) species.

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