Abstract
The idea that natural selection acts on many levels—and not only at the level of organisms or individual genes—is increasingly accepted among biologists. However, it is not easy to reconcile this idea with the strictly “individualistic” conception of the evolutionary process that has always characterized Darwinian thought. Moreover, the individuality of some forms of life is a vague concept and therefore controversial. This is the case of Candidatus Magnetoglobus multicellularis, whose discovery immediately inspired the following question: Does the concept of individuality have degrees? Alternatively, how far is this structure of prokaryotic cells from deserving to be called an organism? In this article, we propose a new conceptual scheme based on an idea of individuality that is not limited to organisms and that makes sense in terms of Darwinian evolution. In this conceptual scheme, selection at levels above that of the individual organism is interpreted as the evolutionary emergence of higher-level individuality. This proposal may serve as a basis on which to construct a promising hierarchical evolutionary theory.
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References
Abreu F, Martins JL, Silveira TS, Keim CN, Lins de Barros HGP, Queiros Filho FJ, Lins U (2007) ‘Candidatus Magnetoglobus multicellularis’, a multicellular, magnetotactic prokaryote from a hypersaline environment. International Journal of Systematic and Environmental Microbiology 57: 1318–1322.
Abreu F, Silva KT, Martins JL, Lins U (2006) Cell viability in magnetotactic multicellular prokaryotes. International Microbiology 9: 267–272.
Burt A (2000) Perspective: Sex, recombination and the efficacy of selection: Was Weismann Right? Evolution 54: 337–351.
Buss LW (1987) The Evolution of Individuality. Princeton, NJ: Princeton University Press.
Dawkins R (1989) The Selfish Gene, 2nd ed. Oxford, UK: Oxford University Press.
García Leal A (2006) Sesgos ideológicos en las teorías sobre la evolución del sexo. PhD thesis, Universidad Autónoma de Barcelona, Barcelona, Spain.
García Leal A (2008) El sexo de las lagartijas: Controversias sobre la evolución de la sexualidad. Barcelona, Spain: Tusquets Editores.
Ghiselin MT (1974) A radical solution to the species problem. Systematic Zoology 23: 536–544.
Ghiselin MT (2009) Metaphysics and classification: Update and overview. Biological Theory 4: 253–259.
Grassé P-P, Noirot C (1958) Construction et architecture chez les termites champignonnistes (Macrotermitinae). Proceedings of the Tenth International Congress of Entomology, Montreal 1956, 2: 515–520.
Grosberg RK, Strathmann RR (2007) The evolution of multicellularity: A minor major transition? Annual Review of Ecology, Evolution, and Systematics 38: 621–654.
Hamilton WD (1964) The genetical evolution of social behavior, I, II. Journal of Theoretical Biology 7: 1–52.
Himler AG, Caldera EJ, Baer BC, Fennández-Marin H, Mueller UG (2009) No sex in fungus-farming ants or their crops. Proceedings of the Royal Society B: Biological Sciences 276(1667): 2611–2616. DOI: 10.1098/rspb.2009.0313
Hull DL (1976) Are species really individuals? Systematic Zoology 25: 174–191.
Hull DL (1988) Interactors versus vehicles. In: The Role of Behavior in Evolution (Plotkin HC, ed), 19–50. Cambridge, MA: MIT Press.
Hull DL (1989) The Metaphysics of Evolution. Stony Brook, NY: State University of New York Press.
Keim CN, Abreu F, Lins U, Lins de Barros HGP, Farina M (2004a) Cell organization and ultrastructure of a magnetotactic multicellular organism. Journal of Structural Biology 145: 254–262.
Keim CN, Martins JL, Abreu F, Rosado AS, Lins de Barros HGP, Borojevic R, Lins U, Farina M (2004b) Multicellular life cycle of magnetotactic prokaryotes. FEMS Letters 240: 203–208.
Kirk DL (1998) Volvox: A Search for the Molecular and Genetic Origins of Multicellularity and Cellular Differentiation. Cambridge, UK: Cambridge University Press.
Lurié D, Wagensberg J (1979) Non-equilibrium thermodynamics and biological growth and development. Journal of Theoretical Biology 78: 241–250.
Mackie GO, Pugh PR, Purcell JE (1987) Siphonophore biology. Advances in Marine Biology 24: 98–262.
Margulis L (1993) Symbiosis in Cell Evolution, 2nd ed. San Francisco, CA: Freeman.
Margulis L, Sagan D (1997) What Is Sex? New York: Nevraumont.
Maynard Smith J (1978) The Evolution of Sex. Cambridge, UK: Cambridge University Press.
Reeve HK, Westneat DF, Noon WA, Sherman PW, Aquadro CF (1990) DNA “fingerprinting” reveals high levels of inbreeding in colonies of the eusocial naked mole-rat. Proceedings of the National Academy of Sciences of the USA 87: 2496–2500.
Shannon CE (1948) A mathematical theory of communication. Bell System Technical Journal 27: 379–656.
Thorne BL (1997) Evolution of eusociality in termites. Annual Review of Ecology and Systematics 28: 27–54.
Wagensberg J (2000) Complexity versus uncertainty: The question of staying alive. Biology and Philosophy 15: 493–508.
Wagensberg J (2009) Understanding form. Biological Theory 3: 325–335.
Weismann A (1889) The significance of sexual reproduction in the theory of natural selection. In: Essays upon Heredity and Kindred Biological Problems (Poulton EB, Schonland S, Shipley AE, eds), 251–332. Oxford: Clarendon Press.
Weismann A (1904) The Evolution Theory. Princeton, NJ: Princeton University Press.
Williams GC (1966) Adaptation and Natural Selection. Princeton, NJ: Princeton University Press.
Williams GC (1975) Sex and Evolution. Princeton, NJ: Princeton University Press.
Williams GC (1992) Natural Selection: Domains, Levels, and Challenges. New York: Oxford University Press.
Wilson EO (1971) The Insect Societies. Cambridge, MA: Belknap Press of Harvard University Press.
Wilson J (1999) Biological Individuality. Cambridge, UK: Cambridge University Press.
Wilson DS, Wilson EO (2007) Rethinking the theoretical foundation of sociobiology. Quarterly Review of Biology 82: 327–348.
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Wagensberg, J., García Leal, A. & Lins de Barros, H.G.P. Individuals versus Individualities: A Darwinian Approach. Biol Theory 5, 87–95 (2010). https://doi.org/10.1162/BIOT_a_00020
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DOI: https://doi.org/10.1162/BIOT_a_00020