. Bulletins of American paleontology. 0 Difference. C Difference Text-figure 10.—Diversity and C:P profiles for Pass Key core 37. Both diversity and the C;P ratio are shown as a difference from the core average. The core mean diversity = The core mean C:P = broken valve pieces were unidentifiable to species or even genus level. However, it was possible to deter- mine whether the valves were pennate or centric. Thus C:P values are probably not affected by preservation quality. However, the low species diversity may have been affected by preservation quality. Salinit
. Bulletins of American paleontology. 0 Difference. C Difference Text-figure 10.—Diversity and C:P profiles for Pass Key core 37. Both diversity and the C;P ratio are shown as a difference from the core average. The core mean diversity = The core mean C:P = broken valve pieces were unidentifiable to species or even genus level. However, it was possible to deter- mine whether the valves were pennate or centric. Thus C:P values are probably not affected by preservation quality. However, the low species diversity may have been affected by preservation quality. Salinity may have been relatively high during this time, as Cyclo- tella litoralis is a marine species (Lange and Syver- ston, 1989). The prevalence of two Mastogloio species (sp. A and sp. R) in RB 19A zone II ( 1888-1921; 130- 90 cm) is also difficult to interpret at the present time. Diversity was generally high during this zone. De- Felice (1976) found that epipelic (bottom-dwelling) di- atom communities were more diverse as compared to epiphytic communities in his study of Florida Bay di- atoms. Therefore, these taxa may be part of an epipelic assemblage. Further study of the literature is necessary in order to determine whether these particular Masto- gloio taxa have been described, and if any autecology is known. These species were not common in an anal- ysis of diatoms from modern surface sediment samples in Florida Bay (unpublished data). This suggests that there have been significant changes in the diatom as- semblages at the Russell Bank site in Florida Bay since around Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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