autotroph


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Related to autotroph: heterotroph

autotroph

(ôt`ətrōf'), in biology, an organism capable of synthesizing its own organic substances from inorganic compounds. Autotrophs produce their own sugars, lipids, and amino acids using carbon dioxide as a source of carbon, and ammonia or nitrates as a source of nitrogen. Organisms that use light for the energy to synthesize organic compounds are called photosynthetic autotrophs; organisms that oxidize such compounds as hydrogen sulfide (H2S) to obtain energy are called chemosynthetic autotrophs, or chemotrophs. Photosynthetic autotrophs include the green plants, certain algae, and the pigmented sulfur bacteria (see photosynthesisphotosynthesis
, process in which green plants, algae, and cyanobacteria utilize the energy of sunlight to manufacture carbohydrates from carbon dioxide and water in the presence of chlorophyll. Some of the plants that lack chlorophyll, e.g.
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). Chemotrophs include the iron bacteria, the nitrifying bacteria, and the nonpigmented sulfur bacteria (see chemosynthesischemosynthesis,
process in which carbohydrates are manufactured from carbon dioxide and water using chemical nutrients as the energy source, rather than the sunlight used for energy in photosynthesis. Much life on earth is fueled directly or indirectly by sunlight.
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). Heterotrophsheterotroph
, living organism that obtains its energy from carbohydrates and other organic material. All animals and most bacteria and fungi are heterotrophic. In contrast, autotrophs are organisms that use inorganic substances as energy sources and carbon dioxide as a carbon source.
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 are organisms that must obtain their energy from organic compounds.

autotroph

[′ȯd·ō‚träf]
(biology)
An organism capable of synthesizing organic nutrients directly from simple inorganic substances, such as carbon dioxide and inorganic nitrogen.
References in periodicals archive ?
For example, it would be interesting to know if herbivore species that function as "keystone herbivores" in other habitats, propagating trophic cascades to the level of autotrophs, are similar to low-N:P Daphnia in lakes.
We constructed microcosms that contained autotrophs, decomposers, and dead organic and inorganic nutrients and varied the number of consumer species stocked in each microcosm.
The question asked in this situation is how good a predator the mixotroph must be in order to compensate for the assumed "price" paid in affinity for dissolved nutrients relative to the specialized osmotrophic autotroph.
Aquatic webs contained, on average, significantly smaller autotroph and herbivore taxa and (in the case of marine systems) larger top predators.
The Earth began to cool, The autotrophs began to drool," which I think is an over-simplification.
Bacteria that use inorganic carbon source (CO2) as their sole carbon source are called autotrophs.
The day 41 nitrate uptake rate was not as high as that on day 0, however, presumabl y because of lower demand for DIN by photosynthetic autotrophs as light levels and GPP declined after leaves developed in the forest canopy (Fig.
To survive, you either eat something an autotroph made (carrots, corn, apples), or you eat something that once ate autotrophs (a hamburger was once chomping on grass all day long).
varians, in contrast, is more of an autotroph, getting a significant fraction of its C and energy from newly fixed C via its associated zooxanthellae.
Therefore, open water algae can be the primary autotroph contributing to the wetland's energy flow.
Autotroph (Chapter 9)--An organism that obtains its carbon for growth from C[O.
jannaschii is the first autotroph whose genome has been sequenced.