Coscinodiscus

Fig. 5.1 SEM micrograph of the silica shell of a Coscinodiscus sp. diatom cell...

Roy, S., Harris, R. P., and Poulet, S. A. (1989). Inefficient feeding by Calanus helgolandicus and Temora longicornis on Coscinodiscus wailesii Quantitative estimation using chlorophyU-type pigments and effects on dissolved free amino acids. Mar. Ecol. Prog. Ser. 52, 145—153. 

A few other symbioses have been described between a heterocystous cyanobacterium of similar morphology to Ambaena and Nostoc cells residing with Coscinodiscus sp. and Roperia tessellata diatoms, respectively (Taylor, 1982 Villareal, 1992). Interestingly, Carpenter (2002 Plate Ilb) found the cyanobionts of a Coscinodiscus sp. diatom collected near Zanzibar similar in cell morphology and diameter to a unicellular Synechocystis sp. 

Boyd, C. M., and Gradmann, D. (1999a). Electrophysiology of the marine diatom Coscinodiscus wailesii. I Endogenous changes of membrane voltage and resistance. J. Exp. Bot. 50, 445—451. 

Fig. 6.12 (a) Skeleton of siliceous radiolarian Theocorythium vetulum, early Pleistocene, equatorial Pacific. Scale bar = 75pm. (b) Siliceous diatom Coscinodiscus radiatus, early Pleistocene, equatorial Pacific. Scale bar = 3 8 tm. Photographs courtesy of B. Funnell. 

Autumn Bloom The autumn bloom is most prominent in the western Baltic Sea. In this marine-influenced region, the Ceratium blooms constitute the most recurrent element of the annual succession. This situation has not changed in the past 100 years (Wasmund et al., 2007). The diatom components of the autumn bloom change, however, from year to year. The autumn bloom in the Baltic Proper was strongest in the years 1988— 1990 and always dominated by Coscinodiscus granii. 

Figure 1. Relationship between surface area volume ratios and total UV-B-induced photoproducts in 9 marine Antarctic diatoms. 1 Coscinodiscus oculis-iridis 2 Corethron cryophilum 3 Odontella weissflogii 4 Thalassiosira australis 5 Chaetoceros convolutus 6 Thalassiosira subtilis 7 Chaetoceros socialis 8 Chaetoceros neglectus 9 Nitzschia kerguelensis. [Redrawn after Karentz et al. 9.]...

The cell abundance ratio between Chaetoceros spp. and Coscinodiscus spp. (denoted by F) could reflect nitrogen and phosphorus conditions, and it could... 

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