School of Science Department of Ocean Science 50 Department of Ocean Science Study on the Adaptation and Physiological Responses of Synechococcus Isolates from Different Oceans Supervisor: LIU Hongbin / OCES Student: HUNG Man Ching / OST Course: UROP 1100, Fall Synechococcus are some of the most widespread photosynthetic organisms in the marine environment. These unicellular Picocyanobacteria contribute greatly to global marine primary production by striving in diverse environments through their multiple clades. Different clades are often found to be adapted to a wide range of environmental conditions, however there are optimal conditions for each clade. Better understanding of the niche of each strain of clades in controlled conditions could offer insight to the environments required for their growth and development. This research aims to culture different strains of Synechococcus to examine their growth and development in controlled conditions with the objective of discovering the adaptability of different strains in the conditions set for this experiment. Study on the Adaptation and Physiological Responses of Synechococcus Isolates from Different Oceans Supervisor: LIU Hongbin / OCES Student: SHIN Woo-hong / BISC Course: UROP 1100, Fall UROP 2100, Spring Synechococcus is a unicellular cyanobacterium that habitats a wide range in the marine environment and other aquatic environments. It is a photosynthetic coccoid cell, and its size varies from 0.5 to 2 µm. It serves as one of the important producers in the marine ecosystem. Synechoccous contributes to primary production in oligotrophic environments, and they are essential in supporting upper trophic levels. It also plays a significant role in the biochemical cycle including Carbon and Nitrogen Cycles. As it is a photosynthetic bacterium, Synechococcus has an efficient mechanism to adapt to changes in environmental conditions including salinity and light intensity. Due to their effective ecological adaptation, studying their physiological responses is essential to predict future ecological changes. In this study, we collected the various strains of Synechococcus from different oceans and observed the specific physiological responses to temperature changes. Further, we discussed any special observations and the possible ecological consequences resulting from their responses.
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