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Superorganism

Group of synergistic organisms

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  • 4 chapters

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Through Species, Eusociality and Division of labour

Concept

The term superorganism is used most often to describe a social unit of eusocial animals in which division of labour is highly specialised and individuals cannot survive by themselves for extended periods. Ants are the best-known example of such a superorganism. A superorganism can be defined as "a collection of agents which can act in concert to produce phenomena governed by the collective", phenomena being any activity "the hive wants" such as ants collecting food and avoiding predators, or bees choosing a new nest site. In challenging environments, micro organisms collaborate and evolve together to process unlikely sources of nutrients such as methane. This process called syntrophy ("eating together") might be linked to the evolution of eukaryote cells and involved in the emergence or maintenance of life forms in challenging environments on Earth and possibly other planets. Superorganisms tend to exhibit homeostasis, power law scaling, persistent disequilibrium and emergent behaviours.

The term was coined in 1789 by James Hutton, the "father of geology", to refer to Earth in the context of geophysiology. The Gaia hypothesis of James Lovelock, and Lynn Margulis as well as the work of Hutton, Vladimir Vernadsky and Guy Murchie, have suggested that the biosphere itself can be considered a superorganism, but that has been disputed. This view relates to systems theory and the dynamics of a complex system.

The concept of a superorganism raises the question of what is to be considered an individual. Toby Tyrrell's critique of the Gaia hypothesis argues that Earth's climate system does not resemble an animal's physiological system. Planetary biospheres are not tightly regulated in the same way that animal bodies are: "planets, unlike animals, are not products of evolution. Therefore we are entitled to be highly skeptical (or even outright dismissive) about whether to expect something akin to a 'superorganism'". He concludes that "the superorganism analogy is unwarranted".

Some scientists have suggested that individual human beings can be thought of as "superorganisms"; as a typical human digestive system contains 1013 to 1014 microorganisms whose collective genome, the microbiome studied by the Human Microbiome Project, contains at least 100 times as many genes as the human genome itself. Scholars who consider individual cells as organisms, consider all multicellular organisms as superorganisms. Salvucci wrote that superorganism is another level of integration that is observed in nature. These levels include the genomic, the organismal and the ecological levels. The genomic structure of organisms reveals the fundamental role of integration and gene shuffling along evolution.

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