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Population Interaction Cheat Sheet by

Biology

Types of Intera­ctions

Predation
Predator eats prey
 
Population cycles: sinusoidal growth
Herbivory
Organism feeds on photos­ynt­hetic organisms
Symbiosis

Types of Symbiotic Relati­onships

Mutualism
both benefi­tting (lichen- algae and fungi)
Commen­salism
one benefits, other is neither benefitted nor harmed
Parasitism
parasite benefits host is harmed
 

Compet­ition

Infras­pecific 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 Growth

Densit­y-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 Mechanisms

Camouflage
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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