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| Author(s): |
André Francisco Bucci
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto Oceanográfico (IO/DIDC) |
| Defense date: | 2013-10-29 |
| Examining board members: |
Áurea Maria Ciotti;
Sonia Maria Flores Gianesella;
Clarisse Odebrecht
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| Advisor: | Áurea Maria Ciotti |
| Abstract | |
Acurate descriptions of phytoplankton community structures depends on reliable estimation of biomass and on the understanding of light absorption. It is crucial to trace relationships between taxonomic groups and geometrical morphotypes. We investigated the influence of phytoplankton shapes in the light absorption coefficient by investigating surface/volume (S/V) ratios. Phytoplankton communities from the continental shelf were detailed taxonomicaly and also categorized in geometrical morphotypes in order to calculate phytoplankton biomass, S/V ratios and size to explore relatioships with spectral light absorption coefficients. The Carbon-to-Chlorophyll ratio varied between surface and the chlorophyll maximum deph while biomass remain fairly constant, and both diatoms and dinoflagellates were the main groups present in high biomass. Exclusive morfotypes were observed for some taxonomic groups, however, S/V ratios ranges were shared by distinct taxonomic groups and morphotypes. The conversion between biovolume and biomass must take taxonomic composition into account. The mean S/V for a community show no relatioship with the magnitude of ligth absorption. The results show a low performance of pigment-based models for description of fitoplankton size classes and highlight the importance of incorporating photooaclimation for bio-optical discrimination of marine phytoplankton communities (AU) | |
| FAPESP's process: | 11/04783-4 - The effect of phytoplankton shape on the light absorption spectral curve and its implications to quantify particulate carbon using remote sensing |
| Grantee: | André Francisco Bucci |
| Support Opportunities: | Scholarships in Brazil - Master |