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Predation
Predator eats prey
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Population cycles: sinusoidal growth
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Herbivory
Organism feeds on photosynthetic organisms
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Symbiosis
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Mutualism
both benefitting (lichen- algae and fungi)
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Commensalism
one benefits, other is neither benefitted nor harmed
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Parasitism
parasite benefits host is harmed
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Infraspecific Competition
same species
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Interspecific Competition
Mechanism: Interference - competition between members of different species, to obtain resources
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Mechanism: Exploitative - better ability to get resources, not enough left for others
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Resource Partitioning
using different resources in a habitat.
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niche: organisms role, abiotic and biotic
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Density-Independent Factors
natural disturbances, climate change, pollution
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Density-Dependant Factors
disease, predation, competition (food, space, mate)
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Allee Effect
population density too low: undercrowding. Contradicts logistic growth model
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Camouflage
mimics environment. coloration
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Mimicry
mimics another organism. coloration.
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Chemical Defence
releases noxious odours or concentrates poisons
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Behavioural Defence
passive: hiding, playing dead & active fleeing, herding
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Structural Defence
external armour
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Cheatography n. The art of mapping complex subjects into clear, instantly navigable reference guides.
