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Title: | Studio della risposta fotosintetica del fitoplancton in differenti condizioni dinamiche mediante l'utilizzo di un mesocosmo | Other Titles: | Study of photosynthetic response of Phytoplankton, in different dynamic conditions, through the use of a mesocosm | Authors: | Albani, Marta | Keywords: | Fotosintesi;Produzione primaria;Fotoacclimatazione;Stratificazione;Mescolamento;PAM-Impulsi d'intensità modulata;Photosynthesis;Photo-acclimatation;Stratified;Mixing;PAM-Pulse amplitude modulating;BIO/07 | Issue Date: | 16-Jun-2017 | Publisher: | Università degli studi della Tuscia - Viterbo | Series/Report no.: | Tesi di dottorato di ricerca. 28. ciclo | Abstract: | The studies on global carbon flow use satellite data and regional information to create forecasting models of primary production. The aim of this project was to study the effects of sea microscale dynamics on photosynthetic activity through the use of the Pelagic Marine Mesocosm (PEMAM). The PEMAM was built to study phytoplankton physiology and photo-acclimatation and was realized in modules composed of a net, ballasted pipes and upper afloat boas to maintain a natural regime of mixing and limit the "effect-of-wall" and biofouling formation. The samples were collected every hour at 5 and 25 meter depths and analysed by the fluorimeter WATER PAM. The PEMAM reduced horizontal flow speed (30%) maintained phytoplankton cells in the same physical-chemical conditions for a long time, increasing their photo-acclimatization ability. This behaviour was verified in the P/I curves which showed a photo-saturation state for a long time in the inside collected samples, and in the photophysiological parameters which showed a temporal shift of internal respect to external trends. In summer photosynthetic efficiency averages were higher in depper water whereas in winter this avereges were higher at the surface. Pearson's coefficient indicated that photosynthetic efficiency and ETR max correlated to photo-physiological parameters were independent from dynamic conditions, whereas the light and temperature appeared to be affected by dynamic conditions. Finally, we used data obtained in situ to observe the daily variation of Primary production. |
Description: | Dottorato di ricerca in Ecologia e gestione delle risorse biologiche |
URI: | http://hdl.handle.net/2067/3106 |
Appears in Collections: | Archivio delle tesi di dottorato di ricerca |
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malbani_tesid.pdf | 6.64 MB | Adobe PDF | View/Open |
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