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Convert Biovolume to Carbon for Diatoms (All Sizes)

Source: R/ifcb_helper_functions.R
vol2C_diatom.Rd

This function converts biovolume in microns^3 to carbon in picograms for diatoms across the full size range according to Menden-Deuer and Lessard 2000. The formula used is: log pgC cell^-1 = log a + b * log V (um^3), with log a = -0.541 and b = 0.811.

Usage

vol2C_diatom(volume)

Arguments

volume

A numeric vector of biovolume measurements in microns^3.

Value

A numeric vector of carbon measurements in picograms.

Details

This relationship is fit to diatoms of all sizes and assigns a higher carbon density than vol2C_lgdiatom (which is specific to large diatoms larger than 3000 micron^3). Because the large-diatom equation is intended only for cells > 3000 micron^3, switching equations at that threshold introduces a discontinuity: at 3000 micron^3 the all-sizes equation predicts ~190 pgC versus ~135 pgC for the large-diatom equation. (The two curves themselves only intersect near 4e5 micron^3.)

References

Menden-Deuer Susanne, Lessard Evelyn J., (2000), Carbon to volume relationships for dinoflagellates, diatoms, and other protist plankton, Limnology and Oceanography, 45(3), 569-579, doi: 10.4319/lo.2000.45.3.0569.

See also

vol2C_lgdiatom for the large-diatom (> 3000 micron^3) relationship.

Examples

# Volumes in microns^3
volume <- c(500, 1000, 2000)

# Convert biovolume to carbon for diatoms (all sizes)
vol2C_diatom(volume)
#> [1]  44.44927  77.98301 136.81551