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