Uptake by heterotrophs

FIGURE 2 Relationship between biological availability of autochthonously produced DOM (labile/recalcitrant) and (i) concentration in situ and (ii) uptake by heterotrophic microorganisms. Box sizes indicate ambient concentrations, whereas arrow thicknesses indicate transformation rates. 

Hoch, M. P., and D. L. Kirchman. 1995. Ammonium uptake by heterotrophic bacteria in the Delaware Estuary and adjacent coastal waters. Limnology and Oceanography 40 886-897. 

Kirchman, D. L., H. W. Ducklow, J. J. McCarthy, and C. Garside. 1994. Biomass and nitrogen uptake by heterotrophic bacteria during the spring phytoplankton bloom in the north Atlantic Ocean. Deep-Sea Research 141 879-895. 

Middleburg, J. J., and J. Nieuwenhuize. 2000b. Nitrogen uptake by heterotrophic bacteria and phytoplankton in the nitrate rich Thames Estuary. Marine Ecology Progress Series 203 13-21. 

Kirchman, D. L., Keil, R. G., and Wheeler, P. A. (1990). Carbon limitation of ammonium uptake by heterotrophic bacteria in the subarctic Pacific. Limnol. Oceanogr. 35, 1258—1266. 

Direct measurements of N uptake by heterotrophic bacteria in the Southern Ocean have only been conducted in the coastal waters of the northern Gerlache Strait region of the Antarctic Peninsula (Tupas et al., 1990, 1994). They determined that during a rich phytoplankton bloom, bacteria (<0.80 pm filtrates incubated in the dark) were responsible for 8—25% (mean = 17%) of the total community uptake. 

Kirchman, D. L., and P. A. Wheeler. 1998. Uptake of ammonium and nitrate by heterotrophic bacteria and phytoplankton in the sub-Arctic Pacific. Deep-Sea Research 145 347-365. 

Kirchman, D. L. 1994. The uptake of inorganic nutrients by heterotrophic bacteria. Microbial Ecolology 28 255-271. 

Graneh, E., Anderson, D., Carlsson, P., and Maestrini, S. (1997). Light and dark carbon uptake by Dinophysis species in comparison to other phytosynthetic and heterotrophic dinoflageUates. Aquat. Microb. Ecol. 13, 177—186. 

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