preyFAs: Prey fatty acid signatures. Each prey signature is a row with...

In QFASA: Quantitative Fatty Acid Signature Analysis

Prey fatty acid signatures. Each prey signature is a row with fatty acid proportions in columns.

Description

The prey file should contain all of the individual fatty acid signatures of the prey and their lipid contents (where appropriate) - a matrix of the mean values for the FAs (prey.matrix) by the designated prey modelling group is then calculated using the MEANmeth function.

Usage

preyFAs

Format

A data frame with 302 observations and 70 variables:

Lab.Code

TODO

Species

TODO

lipid

TODO

c12.0

c13.0

Iso14

c14.0

c14.1w9

c14.1w7

c14.1w5

Iso15

Anti15

c15.0

c15.1w8

c15.1w6

Iso16

c16.0

c16.1w11

c16.1w9

c16.1w7

c7Me16.0

c16.1w5

c16.2w6

Iso17

c16.2w4

c16.3w6

c17.0

c16.3w4

c17.1

c16.3w1

c16.4w3

c16.4w1

c18.0

c18.1w13

c18.1w11

c18.1w9

c18.1w7

c18.1w5

c18.2d5.11

c18.2w7

c18.2w6

c18.2w4

c18.3w6

c18.3w4

c18.3w3

c18.3w1

c18.4w3

c18.4w1

c20.0

c20.1w11

c20.1w9

c20.1w7

c20.2w9

c20.2w6

c20.3w6

c20.4w6

c20.3w3

c20.4w3

c20.5w3

c22.1w11

c22.1w9

c22.1w7

c22.2w6

c21.5w3

c22.4w6

c22.5w6

c22.4w3

c22.5w3

c22.6w3

c24.1w9

Details

Like the predator .csv file you can have as many tombstone data columns as required but there must be at least one column that identifies the modelling group, in this case, Species.

Unlike the predator data, the prey data is not subsetted and renomalized during the modelling so the prey file needs to be subsetted for the desired fatty acid set and renormalized to sum to 1 prior to calculating the mean values.

The full FA set is extracted from the data frame (columns 4 onward), subsetted for the FA set in use and then renormalized over 1. The modelling group names (the "Species" column in this case) is then added back to the subsetted and renormalized data (as the first column) and the average values calculated using the MEANmeth function. Note that for the MEANmeth function to work the modelling group name must be in the first column.

QFASA documentation built on Nov. 17, 2023, 1:08 a.m.