Science

Types of Symbiosis in Nature

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Symbiosis Type
Who Benefits
Example
Habitat
Known For
Mutualism
Both speciesClownfish and sea anemoneCoral reefsClownfish get shelter and food scraps, anemone gets cleaning and protection
Mutualism (obligate)
Both, cannot survive aloneLichen (fungus + alga/cyanobacterium)Rocks, tree bark worldwideFungus provides structure, alga photosynthesizes, neither can live apart
Mutualism (pollination)
BothYucca moth and yucca plantNorth American desertsOnly the yucca moth pollinates yucca, in return lays eggs in its seeds
Mutualism (cleaning)
BothCleaner wrasse and large reef fishTropical reefsCleaner eats parasites off client fish, both benefit, clients line up at cleaning stations
Mutualism (gut flora)
BothTermites and cellulose-digesting microbesTermite gutsMicrobes digest wood for termites, termites provide home and food, let termites eat houses
Commensalism
One benefits, other unaffectedCattle egrets and grazing cattleGrasslandsEgrets eat insects kicked up by cattle, cattle neither helped nor harmed
Commensalism (phoresy)
Hitchhiker benefitsRemora fish and sharksOpen oceanRemoras attach to sharks for free rides and food scraps, shark unaffected
Commensalism (inquilinism)
Tenant benefitsBirds nesting in tree hollowsForestsTenant uses another organism's structure as home without harming it
Parasitism
Parasite benefits, host harmedTapeworm in mammal intestineHost gutClassic parasitism, steals nutrients, can grow meters long
Parasitism (brood parasite)
Parasite benefitsCuckoo laying in warbler nestsForests worldwideCuckoo chick ejects host eggs and is raised by unrelated parents
Parasitoidism
Parasitoid, host killedParasitoid wasps on caterpillarsWorldwideLarva develops inside host and eventually kills it, basis for biological pest control
Amensalism
One harmed, other unaffectedPenicillium mold inhibiting bacteriaSoils, decaying matterMold releases antibiotics that kill bacteria, mold itself unaffected
Competition
NeitherLions and hyenas over carcassesAfrican savannaBoth species lose energy and risk injury fighting for the same resource
Endosymbiosis
Both, one lives inside the otherCoral and zooxanthellae algaeCoral reefsAlgae photosynthesize inside coral cells, their loss causes coral bleaching
Mycorrhiza
BothPlant roots and mycorrhizal fungiSoils worldwideFungi extend plant roots, trade nutrients for sugars, >90% of plant species rely on it
Mimicry partnerships
Depends on mimic and modelAnts tending aphids for honeydewTemperate meadowsAnts protect aphids from predators in exchange for sugary excretions

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