Date of Award
Fall 12-1-2025
Document Type
Dissertation
Degree Name
Doctor of Philosophy (PhD)
Department
Earth & Environmental Systems
First Advisor
Amos Winter
Second Advisor
Jeffery Stone
Third Advisor
Jennifer Latimer
Abstract
Within the vast ocean lies the Lower Photic Zone, one of Earth's least explored frontiers and among the largest biomes on the planet. The Lower Photic Zone, situated at the base of the photic zone, comprises a unique chemical and environmental region that crosses all ocean basins. The biogeochemical dynamics of the Lower Photic Zone are driven by microorganisms, among which coccolithophores play a pivotal role. These golden-brown unicellular algae, ubiquitous in the world's oceans photic zones, are vital in the transfer of atmospheric CO2 into ocean depths and in the production of oxygen through photosynthesis. While all coccolithophores mediate CO2 cycling, those residing in the Lower Photic Zone likely do so at considerable extent and through distinct mechanisms. Little attention has been given to the Lower Photic Zone because it is beyond the reach of satellite telemetry and shipboard observations are rare. Our understanding of coccolithophores in the Lower Photic Zone thus remains limited, especially concerning their population dynamics and role in modulating biogeochemical cycles. Additionally, their ability to switch between photosynthesis and mixotrophy as energy sources demonstrates their ecological adaptability. Gaining insights into the processes of atmospheric CO2 sequestration and the role of coccolithophores in response to current environmental pressures is crucial for comprehending their influence on modern climate variability.
Recommended Citation
Millán, Josué G., "The Role of Coccolithophores in the Lower Photic Zone" (2025). All-Inclusive List of Electronic Theses and Dissertations. 3718.
https://scholars.indianastate.edu/etds/3718
Included in
Biology Commons, Environmental Sciences Commons, Marine Biology Commons, Oceanography Commons