Contents 1 Definition 1.1 Obligate versus facultative 2 Physical interaction 3 Mutualism 3.1 Mutualism and endosymbiosis 4 Commensalism 5 Parasitism 6 Amensalism 7 Synnecrosis 8 Evolution 8.1 Vascular plants 8.2 Symbiogenesis 8.3 Co-evolution 9 See also 10 References 11 Bibliography 12 External links


Definition[edit] In 1877, Albert Bernhard Frank used the term symbiosis which previously had been used to depict people living together in community to describe the mutualistic relationship in lichens.[6] In 1879, the German mycologist Heinrich Anton de Bary defined it as "the living together of unlike organisms."[7][8] The definition has varied among scientists with some advocating that it should only refer to persistent mutualisms, while others thought it should apply to any type of persistent biological interaction in other words mutualistic, commensalistic, or parasitic.[9] After 130 years of debate,[10] current biology and ecology textbooks use the latter "de Bary" definition or an even broader definition where symbiosis means all species interactions, and the restrictive definition where symbiosis means only mutualism is no longer used.[11] Obligate versus facultative[edit] Symbiosis relationships can be obligate, meaning that one or both of the symbionts entirely depend on each other for survival. For example, in lichens, which consist of fungal and photosynthetic symbionts, the fungal partners cannot live on their own.[7][12][13][14] The algal or cyanobacterial symbionts in lichens, such as Trentepohlia, can generally live independently, and their symbiosis is, therefore, facultative (optional).[citation needed]


Physical interaction[edit] Main article: Physical interaction See also: Root microbiome Alder tree root nodule Endosymbiosis is any symbiotic relationship in which one symbiont lives within the tissues of the other, either within the cells or extracellularly.[5][15] Examples include diverse microbiomes, rhizobia, nitrogen-fixing bacteria that live in root nodules on legume roots; actinomycete nitrogen-fixing bacteria called Frankia, which live in alder root nodules; single-celled algae inside reef-building corals; and bacterial endosymbionts that provide essential nutrients to about 10%–15% of insects.[citation needed] Ectosymbiosis, also referred to as exosymbiosis, is any symbiotic relationship in which the symbiont lives on the body surface of the host, including the inner surface of the digestive tract or the ducts of exocrine glands.[5][16] Examples of this include ectoparasites such as lice, commensal ectosymbionts such as the barnacles which attach themselves to the jaw of baleen whales, and mutualist ectosymbionts such as cleaner fish.


Mutualism[edit] Main article: Mutualism (biology) Hermit crab, Calcinus laevimanus, with sea anemone. Mutualism or interspecies reciprocal altruism is a relationship between individuals of different species where both individuals benefit.[17] In general, only lifelong interactions involving close physical and biochemical contact can properly be considered symbiotic. Mutualistic relationships may be either obligate for both species, obligate for one but facultative for the other, or facultative for both. Bryoliths document a mutualistic symbiosis between a hermit crab and encrusting bryozoans; Banc d'Arguin, Mauritania A large percentage of herbivores have mutualistic gut flora to help them digest plant matter, which is more difficult to digest than animal prey.[4] This gut flora is made up of cellulose-digesting protozoans or bacteria living in the herbivores' intestines.[18] Coral reefs are the result of mutualisms between coral organisms and various types of algae which live inside them.[19] Most land plants and land ecosystems rely on mutualisms between the plants, which fix carbon from the air, and mycorrhyzal fungi, which help in extracting water and minerals from the ground.[20] An example of mutual symbiosis is the relationship between the ocellaris clownfish that dwell among the tentacles of Ritteri sea anemones. The territorial fish protects the anemone from anemone-eating fish, and in turn the stinging tentacles of the anemone protect the clownfish from its predators. A special mucus on the clownfish protects it from the stinging tentacles.[21] A further example is the goby fish, which sometimes lives together with a shrimp. The shrimp digs and cleans up a burrow in the sand in which both the shrimp and the goby fish live. The shrimp is almost blind, leaving it vulnerable to predators when outside its burrow. In case of danger the goby fish touches the shrimp with its tail to warn it. When that happens both the shrimp and goby fish quickly retreat into the burrow.[22] Different species of gobies (Elacatinus spp.) also exhibit mutualistic behavior through cleaning up ectoparasites in other fish.[23] Another non-obligate symbiosis is known from encrusting bryozoans and hermit crabs. The bryozoan colony (Acanthodesia commensale) develops a cirumrotatory growth and offers the crab (Pseudopagurus granulimanus) a helicospiral-tubular extension of its living chamber that initially was situated within a gastropod shell.[24] A spectacular examples of obligate mutualism is between the siboglinid tube worms and symbiotic bacteria that live at hydrothermal vents and cold seeps. The worm has no digestive tract and is wholly reliant on its internal symbionts for nutrition. The bacteria oxidize either hydrogen sulfide or methane, which the host supplies to them. These worms were discovered in the late 1980s at the hydrothermal vents near the Galapagos Islands and have since been found at deep-sea hydrothermal vents and cold seeps in all of the world's oceans.[25] There are many types of tropical and sub-tropical ants that have evolved very complex relationships with certain tree species.[26] Mutualism and endosymbiosis[edit] During mutualistic symbioses, the host cell lacks some of the nutrients which the endosymbiont provides. As a result, the host favors endosymbiont's growth processes within itself by producing some specialized cells. These cells affect the genetic composition of the host in order to regulate the increasing population of the endosymbionts and ensure that these genetic changes are passed onto the offspring via vertical transmission (heredity).[27] As the endosymbiont adapts to the host's lifestyle the endosymbiont changes dramatically. There is a drastic reduction in its genome size, as many genes are lost during the process of metabolism, and DNA repair and recombination, while important genes participating in the DNA to RNA transcription, protein translation and DNA/RNA replication are retained. The decrease in genome size is due to loss of protein coding genes and not due to lessening of inter-genic regions or open reading frame (ORF) size. Species that are naturally evolving and contain reduced sizes of genes can be accounted for an increased number of noticeable differences between them, thereby leading to changes in their evolutionary rates. When endosymbiotic bacteria related with insects are passed on to the offspring strictly via vertical genetic transmission, intracellular bacteria go across many hurdles during the process, resulting in the decrease in effective population sizes, as compared to the free living bacteria. The incapability of the endosymbiotic bacteria to reinstate their wild type phenotype via a recombination process is called Muller's ratchet phenomenon. Muller's ratchet phenomenon together with less effective population sizes leads to an accretion of deleterious mutations in the non-essential genes of the intracellular bacteria.[28] This can be due to lack of selection mechanisms prevailing in the relatively "rich" host environment.[29][30]


Commensalism[edit] Phoretic mites on a fly (Pseudolynchia canariensis). Main article: Commensalism Commensalism describes a relationship between two living organisms where one benefits and the other is not significantly harmed or helped. It is derived from the English word commensal, which is used of human social interaction. The word derives from the medieval Latin word, formed from com- and mensa, meaning "sharing a table."[17][31] Commensal relationships may involve one organism using another for transportation (phoresy) or for housing (inquilinism), or it may also involve one organism using something another created, after its death (metabiosis). Examples of metabiosis are hermit crabs using gastropod shells to protect their bodies and spiders building their webs on plants.


Parasitism[edit] Head (scolex) of tapeworm Taenia solium is adapted to parasitism with hooks and suckers to attach to its host. Main article: Parasitism A parasitic relationship is one in which one member of the association benefits while the other is harmed.[32] This is also known as antagonistic or antipathetic symbiosis.[3] Parasitic symbioses take many forms, from endoparasites that live within the host's body to ectoparasites that live on its surface. In addition, parasites may be necrotrophic, which is to say they kill their host, or biotrophic, meaning they rely on their host's surviving. Biotrophic parasitism is an extremely successful mode of life. Depending on the definition used, as many as half of all animals have at least one parasitic phase in their life cycles, and it is also frequent in plants and fungi. Moreover, almost all free-living animals are host to one or more parasite taxa. An example of a biotrophic relationship would be a tick feeding on the blood of its host.


Amensalism[edit] Main article: Biological interaction § Amensalism Amensalism is the type of relationship that exists where one species is inhibited or completely obliterated and one is unaffected by the other. There are two types of amensalism, competition and antibiosis. Competition is where a larger or stronger organism deprives a smaller or weaker one from a resource. Antibiosis occurs when one organism is damaged or killed by another through a chemical secretion. An example of competition is a sapling growing under the shadow of a mature tree. The mature tree can rob the sapling of necessary sunlight and, if the mature tree is very large, it can take up rainwater and deplete soil nutrients. Throughout the process, the mature tree is unaffected by the sapling. Indeed, if the sapling dies, the mature tree gains nutrients from the decaying sapling. Note that these nutrients become available because of the sapling's decomposition, rather than from the living sapling, which would be a case of parasitism. An example of antibiosis is Juglans nigra (black walnut), secreting juglone, a substance which destroys many herbaceous plants within its root zone.[33] Amensalism is an interaction where an organism inflicts harm to another organism without any costs or benefits to the perpetrator.[34] A clear case of amensalism is where sheep or cattle trample grass. Whilst the presence of the grass causes negligible detrimental effects to the animal's hoof, the grass suffers from being crushed. Amensalism is often used to describe strongly asymmetrical competitive interactions, such as has been observed between the Spanish ibex and weevils of the genus Timarcha which feed upon the same type of shrub. Whilst the presence of the weevil has almost no influence on food availability, the presence of ibex has an enormous detrimental effect on weevil numbers, as they consume significant quantities of plant matter and incidentally ingest the weevils upon it.[35]


Synnecrosis[edit] Synnecrosis is a rare type of symbiosis in which the interaction between species is detrimental to both organisms involved.[3] It is a short-lived condition, as the interaction eventually causes death. Because of this, evolution selects against synnecrosis and it is uncommon in nature. An example of this is the relationship between some species of bees and victims of the bee sting. Species of bees who die after stinging their prey inflict pain on themselves (albeit to protect the hive) as well as on the victim. This term is rarely used.[36]


Evolution[edit] Leafhoppers protected by meat ants Symbiosis is increasingly recognized as an important selective force behind evolution,[4][37] with many species having a long history of interdependent co-evolution.[38] In fact, the evolution of all eukaryotes (plants, animals, fungi, and protists) is believed under the endosymbiotic theory to have resulted from a symbiosis between various sorts of bacteria.[4][39][40] This theory is supported by certain organelles dividing independently of the cell, and the observation that some organelles seem to have their own genome.[41] Vascular plants[edit] About 80% of vascular plants worldwide form symbiotic relationships with fungi, for example, in arbuscular mycorrhizas.[42] Symbiogenesis[edit] Main article: Symbiogenesis The biologist Lynn Margulis, famous for her work on endosymbiosis, contended that symbiosis is a major driving force behind evolution. She considered Darwin's notion of evolution, driven by competition, to be incomplete and claimed that evolution is strongly based on co-operation, interaction, and mutual dependence among organisms. According to Margulis and Dorion Sagan, "Life did not take over the globe by combat, but by networking."[43] Co-evolution[edit] Symbiosis played a major role in the co-evolution of flowering plants and the animals that pollinate them. Many plants that are pollinated by insects, bats, or birds have highly specialized flowers modified to promote pollination by a specific pollinator that is also correspondingly adapted. The first flowering plants in the fossil record had relatively simple flowers. Adaptive speciation quickly gave rise to many diverse groups of plants, and, at the same time, corresponding speciation occurred in certain insect groups. Some groups of plants developed nectar and large sticky pollen, while insects evolved more specialized morphologies to access and collect these rich food sources. In some taxa of plants and insects the relationship has become dependent,[44] where the plant species can only be pollinated by one species of insect.[45]


See also[edit] Anagenesis Aposymbiotic Aquaponics Cheating (biology) Cleaning symbiosis Human Microbiome Project Interspecies friendship List of symbiotic organisms List of symbiotic relationships Microbial consortium Multigenomic organism Parabiosis Saprobiontic Symbiosis (chemical)


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External links[edit] TED-Education video – Symbiosis: a surprising tale of species cooperation. Media related to Symbiosis at Wikimedia Commons The dictionary definition of symbiosis at Wiktionary v t e Inter-species biological interactions in ecology Amensalism Commensalism Competition Deception in animals Inquilinism Mimicry Mutualism Neutralism Synnecrosis Predation Carnivore Herbivore Intraguild Parasitism Parasitoidism Cheating Symbiosis Cleaning symbiosis Retrieved from "https://en.wikipedia.org/w/index.php?title=Symbiosis&oldid=819824675" Categories: SymbiosisHidden categories: Articles containing Ancient Greek-language textAll articles with unsourced statementsArticles with unsourced statements from March 2017


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SymbologySymbiosis (disambiguation)EnlargeClownfishSea AnemoneAncient GreekLifeBiological InteractionMutualism (biology)CommensalismParasitismSpeciesHeinrich Anton De BaryMistletoeEctosymbiosisEndosymbiontSymbiodiniumCoralAlbert Bernhard FrankLichenMycologyHeinrich Anton De BaryMutualism (biology)Biological InteractionCommensalismParasitismBiologyEcologyLichenTrentepohlia (alga)Wikipedia:Citation NeededPhysical InteractionRoot MicrobiomeEnlargeEndosymbiosisMicrobiomeRhizobiaNitrogen-fixing BacteriaRoot NodulesLegumeActinomyceteFrankiaAlderAlgaeCoralEndosymbiontWikipedia:Citation NeededEctosymbiosisHost (biology)DigestionExocrine GlandEctoparasitesLiceCommensalismBarnaclesBaleen WhalesCleaner FishMutualism (biology)EnlargeHermit CrabReciprocal AltruismSpeciesBiochemicalEnlargeHermit CrabBryozoansBanc D'ArguinMauritaniaHerbivoresGut FloraProtozoansCoralCarbon FixationMycorrhyzalOcellaris ClownfishTentacleHeteractis MagnificaEatingStingerPredatorMucusGobyCarideaGobyElacatinusBryozoansHermit CrabsSiboglinidTube Worm (body Plan)BacteriaHydrothermal VentsCold SeepDeep-seaEndosymbiontHeredityGenomeMetabolismDNATranscription (genetics)Translation (biology)Open Reading FramePhenotypeMuller's RatchetMutationSelection (biology)EnlargePhoreticMiteCommensalismSocial InteractionPhoresyInquilinismMetabiosisHermit CrabGastropodPlantsEnlargeTapewormTaenia SoliumParasitismHost (biology)ParasitismParasitismEndoparasitesEctoparasitesAnimalPlantFungiTaxonTickBiological InteractionJuglans NigraEnlargeLeafhopperMeat AntCo-evolutionEukaryotesProtistsEndosymbiotic TheoryVascular PlantsArbuscular MycorrhizaSymbiogenesisLynn MargulisEndosymbiosisEvolutionCharles DarwinCo-operation (evolution)InteractionMutual DependenceDorion SaganLifeEarthCombatSocial NetworkCo-evolutionFlowering PlantPollinateInsectBatBirdSpeciationAnagenesisAposymbioticAquaponicsCheating (biology)Cleaning SymbiosisHuman Microbiome ProjectInterspecies FriendshipList Of Symbiotic OrganismsList Of Symbiotic RelationshipsMicrobial ConsortiumMultigenomic OrganismParabiosisSaprobionticSymbiosis (chemical)Henry LiddellRobert Scott (philologist)A Greek–English LexiconPerseus ProjectOxford English DictionaryOxford University PressDigital Object IdentifierDigital Object IdentifierDigital Object IdentifierInternational Standard Serial NumberRoss PiperGreenwood Press (publisher)Digital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierInternational Standard Book NumberSpecial:BookSources/978-0-07-751066-4Digital Object IdentifierDigital Object IdentifierJSTORDigital Object IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierInternational Standard Book NumberSpecial:BookSources/0-19-854294-1International Standard Book NumberSpecial:BookSources/978-0-691-11341-8International Standard Book NumberSpecial:BookSources/0-86542-256-7Digital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierInternational Standard Book NumberSpecial:BookSources/0-412-36470-0Digital Object IdentifierPubMed IdentifierDigital Object IdentifierInternational Standard Book NumberSpecial:BookSources/1-4020-0189-4International Standard Book NumberSpecial:BookSources/0-19-511806-5International Standard Book NumberSpecial:BookSources/0-300-03340-0International Standard Book NumberSpecial:BookSources/0-19-508821-2Digital Object IdentifierJSTORPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierPLOS BiologyDigital Object IdentifierPubMed CentralPubMed IdentifierCommons:Special:Search/SymbiosisWiktionary:Special:Search/symbiosisTemplate:Biological Interaction-footerTemplate Talk:Biological Interaction-footerSpeciesBiological InteractionEcologyBiological InteractionCommensalismCompetition (biology)Deception In AnimalsInquilinismMimicryMutualism (biology)Biological InteractionBiological InteractionPredationCarnivoreHerbivoreIntraguild PredationParasitismParasitoidCheating (biology)Cleaning SymbiosisHelp:CategoryCategory:SymbiosisCategory:Articles Containing Ancient Greek-language TextCategory:All Articles With Unsourced StatementsCategory:Articles With Unsourced Statements From March 2017Discussion About Edits From This IP Address [n]A List Of Edits Made From This IP Address [y]View The Content Page [c]Discussion About The Content Page [t]Edit This Page [e]Visit The Main Page [z]Guides To Browsing WikipediaFeatured Content – The Best Of WikipediaFind Background Information On Current EventsLoad A Random Article [x]Guidance On How To Use And Edit WikipediaFind Out About WikipediaAbout The Project, What You Can Do, Where To Find ThingsA List Of Recent Changes In The Wiki [r]List Of All English Wikipedia Pages Containing Links To This Page [j]Recent Changes In Pages Linked From This Page [k]Upload Files [u]A List Of All Special Pages [q]Wikipedia:AboutWikipedia:General Disclaimer



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