Term
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Definition
| the trophic connections between organisms in a community |
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Term
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Definition
| a linear subset of a food-web showing links between species at different trophic levels. |
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Term
Within a food web there are several different trophic levels:
1rst level |
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Definition
Producers (autotrophs, photo or chemo-synthesizers)
Green plants,
algae in aquatic systems |
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Term
Within a food web there are several different trophic levels:
2nd level |
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Definition
| Primary consumers (heterotrophs) Herbivores |
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Term
Within a food web there are several different trophic levels:
3rd Level |
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Definition
Secondary consumers
Primary carnivores |
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Term
Within a food web there are several different trophic levels:
4rth level |
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Definition
Tertiary consumers
Secondary carnivores |
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Term
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Definition
• Aquatic
• Terrestrial
• Grass land
• Tropical Forrest |
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Term
Types of food webs
-Qualitative(connectedness or topological food webs) |
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Definition
| Who eats who, Connected or topoligical |
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Term
Types of food webs
-Quantitative |
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Definition
| The strength of the reactions, energy flow, functioning web |
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Term
Properties of Food webs
S:
C:
I: |
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Definition
S: Number of Species = Web size
C: Connections= The ratio of the actual interactions to possible interactions (C=t*L/(S*(S-1)/2))
I: Interaction Strength |
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Term
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Definition
| Cannibalism, Intraguild predation |
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Term
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Definition
• Predators less dependent on population of a single prey.
• More Redundancy – if one species removed, other species with similar functions can move in. |
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Term
| MacArthur (1955) argued the more complexity |
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Definition
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Term
| In 1973 Robert May: more complexity |
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Definition
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Term
| Weakly interacting species |
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Definition
stabilize community dynamics by dampening strong, potentially destabilizing consumer–resource interactions
Weak interactions are the glue that binds communities together and keeps them from falling apart! |
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Term
| Average interaction strengths |
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Definition
decrease in diverse systems making them more stable
thus, decreasing biodiversity will increase average interactions strength and decrease stability |
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Term
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Definition
Species that have a greater impact than predicted by their biomass
All species are not equal in their influence on communities |
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