Phytoplankton Microorganisms That Obtain Energy From Photosynthesis

2055 Words9 Pages
Wendy Ziyue Wu
Microbial Ecology
November 30th, 2016
Prof. Elizabeth Wilbanks
Phytoplankton-Bacteria interaction in the Phycosphere Microbiomes
Introduction: Defining Phycosphere and its Composition
Phytoplankton are autotrophic drifter microorganisms that obtain energy from photosynthesis. They serve as the primary producer for aquatic food web, and are often accredited for their importance in carbon cycling. They are mainly found near the surface of freshwater and diluted seawater environment, known as the euphotic zone, to gain maximum exposure to sunlight and maximize rate of photosynthesis (Reynolds 1984). In addition, they produce a surface mucus zone that is rich on nutrient and organic compounds, which attract heterotrophic bacteria to preform chemotaxis and interact with the host phytoplankton, and this microenvironment is known as the phycosphere. This mucilaginous microbiome are globally distributed, though they are mainly concentrated at the central zones of freshwater or dilute seawater environment (Sogee 2015).
This microscopic biome is characterized by its bacterial diversity and density. Studies have shown that bacteria cell count to be higher in the microfilm than the average 106 cells per ml of sea water (Cole 1982). Some examples of associated bacterium genera include Pseudomonas and Acnromobacter, both Gram-negative, aerobic, and have been distinguished as human pathogens in patients with conditions that suppress their immune system (Watanabe et. al,

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