EXTRA! EXTRA! EXTRA! Mudança paradigmática radical na teoria da evolução

quarta-feira, março 28, 2018

Processes and patterns of interaction as units of selection: An introduction to ITSNTS thinking

W. Ford Doolittle and S. Andrew Inkpen

PNAS March 26, 2018. 201722232; published ahead of print March 26, 2018. https://doi.org/10.1073/pnas.1722232115

Edited by Douglas Futuyma, Stony Brook University, Stony Brook, NY, and approved March 7, 2018 (received for review December 22, 2017)


Many practicing biologists accept that nothing in their discipline makes sense except in the light of evolution, and that natural selection is evolution’s principal sense-maker. But what natural selection actually is (a force or a statistical outcome, for example) and the levels of the biological hierarchy (genes, organisms, species, or even ecosystems) at which it operates directly are still actively disputed among philosophers and theoretical biologists. Most formulations of evolution by natural selection emphasize the differential reproduction of entities at one or the other of these levels. Some also recognize differential persistence, but in either case the focus is on lineages of material things: even species can be thought of as spatiotemporally restricted, if dispersed, physical beings. Few consider—as “units of selection” in their own right—the processes implemented by genes, cells, species, or communities. “It’s the song not the singer” (ITSNTS) theory does that, also claiming that evolution by natural selection of processes is more easily understood and explained as differential persistence than as differential reproduction. ITSNTS was formulated as a response to the observation that the collective functions of microbial communities (the songs) are more stably conserved and ecologically relevant than are the taxa that implement them (the singers). It aims to serve as a useful corrective to claims that “holobionts” (microbes and their animal or plant hosts) are aggregate “units of selection,” claims that often conflate meanings of that latter term. But ITSNS also seems broadly applicable, for example, to the evolution of global biogeochemical cycles and the definition of ecosystem function.

evolution natural selection process persistence microbiome



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Sem dúvida uma grande e embaraçosa mudança na Síntese Evolutiva Moderna, atual moribunda teoria da evolução que não quer ser substituída pela Síntese Evolutiva Ampliada/Estendida lançada em agosto de 2015.

Pelo abstract eles  parecem dizer que todas as unidades de seleção devem ser consideradas - genes, células, organismos, espécies, e  comunidades. E aqui este blogger vai ser bem irônico - por que não adicionar os planetas, sistemas solares, galáxias, universos, e até os imaginários multiversos! Vai que um desses inúmeros processos evolutivos falhe...

Fui, nem sei por que, mas pensando nos epiciclos ptolomaicos!

Pano rápido! Darwin kaput desde 1859, mas a Nomenklatura científica teima em não enterrar esse defunto epistemológico por razões puramente ideológicas!