02569nas a2200265   4500008004100000245012600041210006900167300001100236490000600247520170500253653002301958653003601981653002002017653002102037653002602058653002302084653002402107653001702131653002202148100001702170700001602187700001502203700001602218856006902234       2015                        eng d00aThe effects of genotype richness and genomic dissimilarity of Andropogon gerardii on invasion resistance and productivity0 aeffects of genotype richness and genomic dissimilarity of Androp  a61 -710 v83 a<p>Background: The genetic diversity within populations has been shown to affect ecosystem functions, including productivity and invasion resistance. To date most experiments have focused on manipulation of genotypic richness and have ignored other measures of genetic diversity. Aims: In the present study we aimed to establish whether manipulated genotypic richness and genomic dissimilarity of Andropogon gerardii affect productivity and invasion resistance. Methods: We created experimental mesocosms with three levels of genotypic richness: one-, three-, and nine-genotypes. In the three-genotype treatment, we manipulated a range of genomic dissimilarity values (genetic relatedness among individuals). At the end of one growing season we measured above-ground, below-ground and total biomass of the mesocosms, and invasion resistance to Andropogon bladhii. Results: Overall, we found no significant effect of genotypic richness on any measure of ecosystem function, although there tended to be more root biomass (due to complementarity) and invasive seedling biomass with higher levels of genotypic richness. Within the three-genotype treatment we found a significant positive relationship between genomic dissimilarity and above-ground biomass, which was caused by a selection effect. We also found a positive relationship between genomic dissimilarity and biomass of A. bladhii. Conclusions: Using these two measures of genetic diversity we detected differences in the strength and mechanism of positive diversity effects within the same experiment, demonstrating the value of manipulating multiple measures of diversity when performing biodiversity&ndash;ecosystem function experiments.</p>10aAndropogon bladhii10abiodiversity ecosystem function10acomplementarity10adominant species10agenomic dissimilarity10agenotypic richness10ainvasion resistance10aproductivity10atallgrass prairie1 aAvolio, M.L.1 aChang, C.C.1 aWeis, J.J.1 aSmith, M.D.  uhttps://www.tandfonline.com/doi/abs/10.1080/17550874.2013.866990