This function is meant to compare 16S rRNA sequence communities of gradient fractions from 2 gradients: a labeled treatment (eg., 13C-labeled DNA) and its corresponding unlabeled control. First, the beta-diversity (e.g, weighted-Unifrac) is calculated pairwise between fraction communities.

1 2 |

`physeq` |
phyloseq object |

`method` |
See phyloseq::distance |

`weighted` |
Weighted Unifrac (if calculating Unifrac) |

`fast` |
Fast calculation method |

`normalized` |
Normalized abundances |

`parallel` |
Calculate in parallel |

The sample_data table of the user-provided phyloseq object MUST contain the buoyant density (BD) of each sample (a "Buoyant_density" column in the sample_data table). The BD information is used to identify overlapping gradient fractions (gradient fractions usually only partially overlap in BD between gradients) between the labeled treatment gradient and the control gradient. Beta diversity between overlapping fractions is calculated. Then, to standardize the values relative to the unlabeled control (1 beta-diversity value for each control gradient fraction), the mean beta diversity of overlapping labeled treatment gradients is calculated for each unlabeled control, and the percent overlap of each labeled treatment fraction is used to weight the mean.

a data.frame object of weighted mean distances

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | ```
data(physeq_S2D2)
## Not run:
# Subsetting phyloseq by Substrate and Day
params = get_treatment_params(physeq_S2D2, c('Substrate', 'Day'))
params = dplyr::filter(params, Substrate!='12C-Con')
ex = "(Substrate=='12C-Con' & Day=='${Day}') | (Substrate=='${Substrate}' & Day == '${Day}')"
physeq_S2D2_l = phyloseq_subset(physeq_S2D2, params, ex)
# Calculating BD_shift on 1 subset (use lapply function to process full list)
wmean1 = BD_shift(physeq_S2D2_l[[1]])
ggplot(wmean1, aes(BD_min.x, wmean_dist)) +
geom_point()
# Calculating BD_shift on all subsets
lapply(physeq_S2D2_l, BD_shift)
## End(Not run)
``` |

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