Riezad : diforc'h etre ar stummoù

==Pemp riezad==

Krouet e voe ur pempvet riezad evit ar [[Fungus|Fungi]] gant [[Robert Whittaker]]. Ar reizhiad-se, dezhañ pemp riezad, kinniget e 1968, zo deuet da vezañ ar muiañ implijet hag ez eo implijet atav e kalz studiadennoù gant un nebeud gwellaennoù, peotramant evel diazez reizhiadoù neveshoc'h gant meur a riezad. Diazezet eo dreist-holl war disheñvelderioù er [[magerezh]]<!--nutrition-->: ar Plantae zo [[aototrof]]ed lieskelligek dreist-holl, e Animalia zo [[heterotrof]]ed lieskelligek, hag e Fungi [[saprotrof]]ed lieskelligek. En div riezad a chom, Protista ha Monera, a vod bevien unkelligek hag eeun.<ref>R. H. Whittaker, "New concepts of kingdoms of organisms", ''Science'' 1969 levrenn 163, 150–160</ref>

 

 

==Six kingdoms==

In the years around 1980 there was an emphasis on [[phylogeny]] and redefining the kingdoms to be [[monophyletic]] groups, groups made up of relatively closely related organisms. The Animalia, Plantae, and Fungi were generally reduced to core groups of closely related forms, and the others thrown into the Protista. Based on [[rRNA]] studies [[Carl Woese]] divided the prokaryotes (Kingdom Monera) into two kingdoms, called [[bacterium|Eubacteria]] and [[Archaea|Archaebacteria]]. Carl Woese attempted to establish a Three Kingdom system in which Plants, Animals, Protista, and Fungi were lumped into one kingdom of all eukaryotes. The Eubacteria and Archaebacteria made up the other two kingdoms. The initial use of "six Kingdom systems" represents a blending of the classic Five Kingdom system and Woese's Three Kingdom system. Such '''six Kingdom systems''' have become standard in many works.<ref name="Woese1977">{{cite journal | author = C. R. Woese, W. E. Balch, L. J. Magrum, G. E. Fox and R. S. Wolfe | title = An ancient divergence among the bacteria | journal = Journal of Molecular Evolution | volume = 9 | pages = 305–311 | year = 1977 }}</ref>