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  2. Phytoplankton - Wikipedia

    en.wikipedia.org/wiki/Phytoplankton

    Phytoplankton form the base of marine and freshwater food webs and are key players in the global carbon cycle. They account for about half of global photosynthetic activity and at least half of the oxygen production, despite amounting to only about 1% of the global plant biomass.

  3. Marine food web - Wikipedia

    en.wikipedia.org/wiki/Marine_food_web

    Marine food web. The pelagic food web, showing the central involvement of marine microorganisms in how the ocean imports nutrients from and then exports them back to the atmosphere and ocean floor. A marine food web is a food web of marine life. At the base of the ocean food web are single-celled algae and other plant-like organisms known as ...

  4. Photic zone - Wikipedia

    en.wikipedia.org/wiki/Photic_zone

    The photic zone (or euphotic zone, epipelagic zone, or sunlight zone) is the uppermost layer of a body of water that receives sunlight, allowing phytoplankton to perform photosynthesis. It undergoes a series of physical, chemical, and biological processes that supply nutrients into the upper water column. The photic zone is home to the majority ...

  5. Microbial loop - Wikipedia

    en.wikipedia.org/wiki/Microbial_loop

    The aquatic microbial loop is a marine trophic pathway which incorporates dissolved organic carbon into the food chain.. The microbial loop describes a trophic pathway where, in aquatic systems, dissolved organic carbon (DOC) is returned to higher trophic levels via its incorporation into bacterial biomass, and then coupled with the classic food chain formed by phytoplankton-zooplankton-nekton.

  6. Biological pump - Wikipedia

    en.wikipedia.org/wiki/Biological_pump

    v. t. e. The biological pump (or ocean carbon biological pump or marine biological carbon pump) is the ocean's biologically driven sequestration of carbon from the atmosphere and land runoff to the ocean interior and seafloor sediments. [1] In other words, it is a biologically mediated process which results in the sequestering of carbon in the ...

  7. Effects of climate change on oceans - Wikipedia

    en.wikipedia.org/wiki/Effects_of_climate_change...

    Ocean acidification can impact marine ecosystems that provide food and livelihoods for many people. About one billion people are wholly or partially dependent on the fishing, tourism, and coastal management services provided by coral reefs. Ongoing acidification of the oceans may therefore threaten food chains linked with the oceans. [38] [39]

  8. Ocean acidification - Wikipedia

    en.wikipedia.org/wiki/Ocean_acidification

    Ocean acidification is the ongoing decrease in the pH of the Earth's ocean. Between 1950 and 2020, the average pH of the ocean surface fell from approximately 8.15 to 8.05. [ 2] Carbon dioxide emissions from human activities are the primary cause of ocean acidification, with atmospheric carbon dioxide (CO 2) levels exceeding 410 ppm (in 2020).

  9. Upwelling - Wikipedia

    en.wikipedia.org/wiki/Upwelling

    The food chain follows the course of: Phytoplankton → Zooplankton → Predatory zooplankton → Filter feeders → Predatory fish [ 5 ] → Marine birds, marine mammals [ 11 ] Coastal upwelling exists year-round in some regions, known as major coastal upwelling systems , and only in certain months of the year in other regions, known as ...

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