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• W2270798800 abstract "Summary Species coexistence can be promoted by both equalizing mechanisms that increase fitness equivalence among species and stabilizing mechanisms that decrease niche overlap among species. Strength of the coexistence mechanisms can be altered by evolution. In particular, populations evolved in sympatry may show niche divergence due to competition‐mediated selection, whereas populations evolved in allopatry have a chance to become ecologically equivalent competitors which, on secondary contacts, may form ‘neutral communities’. We addressed how evolution may change ecological mechanisms of coexistence with experimental microcosms of Escherichia coli strains that reproduce asexually and can be considered as analogues of species. We obtained five pairs of bacterial strains, within each of which the two strains could coexist stably. We then allowed the bacterial strains to evolve in a chemically defined nutrient medium for ˜1100 generations, under sympatric (in two‐strain mixtures) or allopatric scenarios (in monocultures). The strength of coexistence mechanisms was assessed based on reciprocal invasion assays and measurements of environmental carrying capacity. Our data confirmed that coexistence could be weaken by either fitness difference or niche overlap among competitors. In allopatrically evolved strain pairs, fitness difference among competitors became larger or unchanged; and the magnitude of niche overlap often showed an increase rather than a decline. Sympatrically evolved competitors showed no consistent changing trend in the strength of the coexistence mechanisms. Overall, sympatrically evolved competitor pairs did not differ from allopatrically evolved ones in the magnitude of fitness difference, but had lower levels of niche overlap. The results are consistent with the ‘character displacement’ view that allopatric populations of competing species occupy more similar niche space compared with sympatric populations. However, the pattern observed here resulted from allopatrically evolved competitors showing niche convergence, but not sympatrically evolved competitors consistently showing further niche divergence. The results also suggest that convergent evolution in allopatry followed by secondary contacts is an unlikely mechanism for the origin of ‘neutral communities’." @default.
• W2270798800 created "2016-06-24" @default.
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• W2270798800 date "2015-12-19" @default.
• W2270798800 modified "2023-10-16" @default.
• W2270798800 title "Evolution alters ecological mechanisms of coexistence in experimental microcosms" @default.
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• W2270798800 doi "https://doi.org/10.1111/1365-2435.12611" @default.
• W2270798800 hasPublicationYear "2015" @default.
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