Phytoplankton are the
autotrophic component of the planktoncommunity. The name comes from the Greek words "phyton", or " plant", and πλαγκτος ("planktos"), meaning "wanderer" or "drifter". [cite book
last = Thurman
first = H. V.
year = 1997
title = Introductory Oceanography
publisher = Prentice Hall College
location = New Jersey, USA
ISBN = 0132620723 ] Most phytoplankton are too small to be individually seen with the unaided eye. However, when present in high enough numbers, they may appear as a green discoloration of the water due to the presence of
chlorophyllwithin their cells (although the actual color may vary with the species of phytoplankton present due to varying levels of chlorophyll or the presence of accessory pigments such as phycobiliproteins, xanthophylls, etc.).
Phytoplankton obtain energy through a process called
photosynthesisand must therefore live in the well-lit surface layer (termed the euphotic zone) of an ocean, sea, lake, or other body of water. Through photosynthesis, phytoplankton are responsible for much of the oxygenpresent in the Earth's atmosphere– half of the total amount produced by all plant life. [ [http://earthobservatory.nasa.gov/Newsroom/NasaNews/2005/2005030218443.html NASA Earth Observatory - Satellite sees ocean plants increate] ] Their cumulative energy fixation in carbon compounds ( primary production) is the basis for the vast majority of oceanic and also many freshwater food webs ( chemosynthesisis a notable exception). As a side note, one of the more remarkable food chains in the ocean – remarkable because of the small number of links – is that of phytoplankton fed on by krill(a type of shrimp) fed on by baleen whales.
Phytoplankton are also crucially dependent on minerals. These are primarily macronutrients such as
nitrate, phosphateor silicic acid, whose availability is governed by the balance between the so-called biological pumpand upwellingof deep, nutrient-rich waters. However, across large regions of the World Oceansuch as the Southern Ocean, phytoplankton are also limited by the lack of the micronutrient iron. This has led to some scientists advocating iron fertilizationas a means to counteract the accumulation of human-produced carbon dioxide (CO2) in the atmosphere[Citation | first = M. | last = Richtel | title = Recruiting Plankton to Fight Global Warming | newspaper = New York Times | year = 2007 | date = May 1, 2007 | url = http://www.nytimes.com/2007/05/01/business/01plankton.html?ref=science] .
While almost all phytoplankton species are obligate
photoautotrophs, there are some that are mixotrophicand other, non-pigmented species that are actually heterotrophic (the latter are often viewed as zooplankton). Of these, the best known are dinoflagellategenera such as " Noctiluca" and "Dinophysis", that obtain organic carbon by ingesting other organisms or detrital material.
The term phytoplankton encompasses all photoautotrophic microorganisms in aquatic
food webs. Phytoplankton serve as the base of the aquatic food web, providing an essential ecological function for all aquatic life. However, unlike terrestrial communities, where most autotrophs are plants, phytoplankton are a diverse group, incorporating protistan eukaryotes and both eubacterial and archaebacterial prokaryotes. There are about 5,000 species of marine phytoplankton.Hallegraeff, G.M. (2003). Harmful algal blooms: a global overview. "in" Hallegraeff, G.M., Andewrson, D.M. and Cembella, A.D. (eds) 2003. "Manual on Harmful Marine Microalgae." UNESCO, Paris] There is uncertainty in how such diversity has evolved in an environment where competition for only a few resources would suggest limited potential for niche differentiation. [cite journal
title=The paradox of the plankton
doi = 10.1086/282171 ]
In terms of numbers, the most important groups of phytoplankton include the
diatoms, cyanobacteriaand dinoflagellates, although many other groups of algae are represented. One group, the coccolithophorids, is responsible (in part) for the release of significant amounts of dimethyl sulfide(DMS) into the atmosphere. DMS is converted to sulfate and these sulfate molecules act as cloud condensation nuclei, increasing general cloud cover. In oligotrophicoceanic regions such as the Sargasso Seaor the South Pacific gyre, phytoplankton is dominated by the small sized cells, called picoplankton, mostly composed of cyanobacteria(" Prochlorococcus", " Synechococcus") and picoeucaryotes such as " Micromonas".
* [http://saga.pmel.noaa.gov/review/dms_climate.html NOAA, DMS and Climate]
* [http://planktonnet.sb-roscoff.fr/index.php Plankton*Net] : Images of planktonic species
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