Diatoms, growth rate

The results of two successful iron-fertilization experiments in the eastern equatorial Pacific have clearly shown that phytoplankton growth rate is limited by iron at that location (Martin et al., 1994 Coale et al., 1996). The species composition and size distributions of the ecosystem are influenced by iron availability (Landry et al., 1997). In particular, large diatoms do not grow at optimum rates in the absence of sufficient iron. Loukos et al. (1997) used a simple... 

Diatom Skeietonema costatum) MMTC 72-h EC50 (growth rate) 0.16 0.16 Waish etai. (1985)... 

Diatom Skeietonema costatum) MMTC 96-h NOEC (growth rate) 1.0 1.0 Morton internationai, inc. (1996a)... 

Sunda, W. G. and Huntsman, S. A. (1986). Relationships among growth rate, cellular manganese concentrations and manganese transport kinetics in estuarine and oceanic species of the diatom Thalassiosira, J. Phycol., 22, 259-270. 

Laws EA, Popp BN, Bidigare RR, Kennicutt MC, Macko SA (1995) Dependence of phytoplankton carbon isotopic composition on growth rate and C02aq theoretical considerations and experimental results. Geochim Cosmochim Acta 59 1131-1138 Laws EA, Bidigare RR, Popp BN (1997) Effect of growth rate and CO2 concentration on carbon isotope fractionation by the marine diatom Phaeodactylum tricornutum. Limnol Oceanogr 42 1552-1560... 

Gould, D., and Gallagher, E. (1990) Field measurements of specific growth rate, biomass, and primary production of benthic diatoms of Savin Hill Cove, Boston. Limnol. Oceanogr. 35, 1757-1770. 

The preceding treatment is, undoubtedly, an oversimplification. For example, many diatomic molecules dissociate upon adsorption (e.g., H2, SiH, GeH). Each atom from the dissociated molecule then occupies its own distinct surface site and this naturally changes the rate law expression. When these types of details are accounted for, the Langmuir-Hinshelwood mechanism has been very successful at explaining the growth rates of a number of thin-film chemical vapor deposition (CVD) processes. However, more important, our treatment served to illustrate how crystal growth from the vapor phase can be related to macroscopic observables namely, the partial pressures of the reacting species. 

Growth rates of large and small Southern Ocean diatoms in relation to availability of iron in natural seawater. Limnol Oceanogr 46 260-266... 

Timmermans, K. R., van der Wagt, B., and de Baar, H. J. W. (2004). Growth rates, half-saturation constants, and silicate, nitrate, and phosphate depletion in relation to iron availability of four large, open-ocean diatoms from the Southern Ocean. Limnol. Oceanogr. 49, 2141—2151. 

Berges, J. A., Varela, D. E., Harrison, P. J. (2002). Effects of temperature on the growth rate, cell composition and nitrogen metaboHsm in the marine diatom Thalassiosira pseudonana (BaciQariophyceae). Mar. Ecol. Prog. Ser. 225, 139—146. 

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