Whittaker wrote a brief comment in Ecology shortly after leaving Hanford, stating that the old division between plants and animals was artificial. A better taxonomy, according to Whittaker, would define three large kingdoms based on the ecological tiers.
.
He argued, on the basis of ecology and evolution, that all ecological groupings, past and present, contained producers, consumers, and decomposers. Despite the diversity of these groups, the three feeding techniques that characterized the trophic levels were conceptually unique and reflected three major evolutionary paths.
Whittaker was uninterested in these technical taxonomic concerns, saying that kingdoms should primarily correspond to clear-cut ecological boundaries and serve as taxonomic units secondarily. Whittaker was particularly critical of Copeland's decision to include Protoctista fungus, red and brown algae, and several types of small eukaryotes in the kingdom.
Oh well...
Whittaker spent years perfecting and submitting his proposal. Throughout the years, he faced several disputes and detractors. Finally, he submitted number 5, which was:
Monera
It was Monera, Protista, Fungi, Plantae, and Animalia.
Plantae
Protista
Animalia
Fungi
Years later, his legacy is being shared and taught all over the world as a result of his contribution to ecological taxonomy. Carl Woese, who based the other 5 work from Whittaker, eventually refined his own work into six classifications.
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