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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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