Term
commensalism
(kuh-men-sul-iz-um) |
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Definition
| A symbiotic relationship in which the symbiont benefits but the host is neither helped nor harmed. See Symbiosis. |
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Term
mutualism
(myoo-choo-ul-iz-um) |
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Definition
| A symbiotic relationship in which both the host and the symbiont benefit |
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Term
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Definition
| A symbiotic relationship in which the symbiont (parasite) benefits at the expense of the host by living either within the host (endoparasite) or outside the host (ectoparasite) |
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Term
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Definition
| An interaction between species in which one species, the predator, eats the other, the prey. |
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Term
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Definition
| An organism that obtains organic food molecules without eating other organisms. Autotrophs use energy from the sun or from the oxidation of inorganic substances to make organic molecules from inorganic ones. |
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Term
heterotroph
(het-ur-oh-trohf) |
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Definition
| An organism that obtains organic food molecules by eating other organisms or their by-products. |
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Term
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Definition
| A member of a trophic level of an ecosystem consisting of carnivores that eat mainly other carnivores. |
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Term
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Definition
| The division of species in an ecosystem on the basis of their main nutritional source. The trophic level that ultimately supports all others consists of autotrophs, or primary producers. |
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Definition
| A member of the trophic level of an ecosystem consisting of carnivores that eat herbivores. |
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Definition
| An herbivore; an organism in the trophic level of an ecosystem that eats plants or algae. |
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Definition
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Definition
| Nitrogen fixing bacteria in alfalfa |
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Definition
| lions eating water buffalo |
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Definition
| tape worm in the digestive tract |
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Term
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Definition
| The elaborate, interconnected feeding relationships in an ecosystem. |
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Term
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Definition
| The pathway along which food is transferred from trophic level to trophic level, beginning with producers. |
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