The growth of diatoms under Si:N limitation and salinity difference

Gorm Torarin Østergaard Sandbukt, Riccardo Astiri, Magnus Bruun Knudsen, Motaman Adel Sadour, Elena-Madalina Hizanu & Andreas Friis Petersen

Studenteropgave: Basisprojekt

Abstrakt

Diatoms play a primary role in maintaining global ecosystems. Human wastewater, rich of phosphorus and nitrogen, have caused algal blooms to occur more frequently. Silica, a fundamental nutrient to these algae, has increasingly become a limiting factor for the diatoms generating these blooms. This project therefore investigates how diatoms grow under different levels of silica and the other important limiting nutrient nitrogen, along with different salinities. \textit{C. calcitrans}, a marine diatom, was grown under two different salinities and four different nutrient levels of Nitrogen and Silica. Growth rate, carrying capacity and cell size were analysed in an SPSS ANOVA. The results show no no clear effect from different Silica levels. On the other hand significant statistical differences in carrying capacity between the higher and lower levels of nitrogen and between salinities was observed. \textit{C. calcitrans} seems to grow better at salinity 20 PSU at 17$^{\circ}$C. Further research is needed to better understand the behaviour of this species under different environmental conditions.

UddannelserBasis - International Naturvidenskabelig Bacheloruddannelse, (Bachelor uddannelse) Bachelor
SprogEngelsk
Udgivelsesdato27 maj 2019
Antal sider80
VejledereSimon David Herzog