Gastropods whose primary food source is detrital material: Squilaridae (Caecum pulchellum, C. nitildum, C. floridanum, and C. imbricatum), Olividae (Olivella spp., Oliva sp.), Nassariidae (Nassarius albus) and Atydae (Haminoea succinea).

  Tabb and Manning 1961,  Sabelli 1980,  Harasewych 1991,  McClanahan 1992,  NOAA 1997.

  Humphreys 1981,  Schwinghammer et al. 1986.

  Jorgensen et al. 1991.

Once a general P/B ratio was identified, it was scaled according to the seasonal production variability determined in Venier 1997.

  Schwinghammer et al. 1986,  Venier 1997.

This compartment, and many of the subsequent invertebrate and fishcompartments, use the relationships described in several papers relating respiration to production. In all of these examples, it appears that this relationship yielded more plausible respiration rates for these specific compartments than the allometric relationship described in the Crayfish page of the Cypress Wetland network.

The first step in this methodology converts the production value from carbon to kilocalorie terms. The converted value is needed in order to perform the following procedure.

The next step uses the appropriate relationship described in either McNeil and Lawton 1970 or Humphreys 1979 to determine the respiration value as a dependent variable of production. Specific relationships were provided for various taxanomic groups, and the most appropriate one was selected for each compartment that used this methodology. In this example, the relationship we used was:

log10 R = 1.117 log10 P + 0.574

The log value for respiration is then converted back to the flow rate in grams carbon.

  Jorgensen et al. 1991,  McNeil and Lawton 1970,  Humphreys 1979,  Thayer et al. 1973.

Assimilation efficiency = 80%

  Jorgensen et al. 1991.

Egestion has been calculated using the other parameters : E=C-P-R

benthic algae, benthic bacteria, microfauna, meiofauna, benthic POC.

  Barnes 1994 ,  Venier 1997,  North Carolina network.