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[13] [186] [187] Archaeplastids such as green and red algae eventually surpassed cyanobacteria as major primary producers on continental shelves near the end of the Neoproterozoic, but only with the Mesozoic (251–65 Ma) radiations of secondary photoautotrophs such as dinoflagellates, coccolithophorids and diatoms did primary production in ...
Cyanobacteria (blue-green algae) bloom on Lake Erie (United States) in 2009. These kinds of algae can cause harmful algal bloom. A harmful algal bloom (HAB), or excessive algae growth, is an algal bloom that causes negative impacts to other organisms by production of natural algae-produced toxins, water deoxygenation, mechanical damage to other organisms, or by other means.
Declines in the duration and extent of sea ice in the Arctic leads to declines in the abundance of ice algae, which thrive in nutrient-rich pockets in the ice. These algae are eaten by zooplankton, which are in turn eaten by Arctic cod, an important food source for many marine mammals, including seals. Seals are eaten by polar bears.
These have unicellular algae as endosymbionts, from diverse lineages such as the green algae, red algae, golden algae, diatoms, and dinoflagellates. [36] Mixotrophic foraminifers are particularly common in nutrient-poor oceanic waters. [58] Some forams are kleptoplastic, retaining chloroplasts from ingested algae to conduct photosynthesis. [59]
Petroleum is formed when algae and zooplankton die and sink in anoxic conditions to be buried on the ocean floor without being decomposed by aerobic bacteria, and only a tiny amount of the world's deposits of coal contain dinosaur fossils; the vast majority of coal is fossilized plant matter.
Marine algae can be divided into six groups: green, red and brown algae, euglenophytes, dinoflagellates and diatoms. Dinoflagellates and diatoms are important components of marine algae and have their own sections below. Euglenophytes are a phylum of unicellular flagellates with only a few marine members. Not all algae are microscopic.
Algae in the genus Caulerpa synthesize a mixture of toxins [7] termed caulerpicin, believed to impart a peppery taste to the plants. [8] The effects of the specific toxin synthesized by C. taxifolia , caulerpenyne , have been studied, [ 9 ] [ 10 ] with extracts from C. taxifolia being found to negatively affect P-glycoprotein -ATPase in the sea ...
Recent studies now indicate that the SML covers the ocean to a significant extent, and evidence shows that it is an aggregate-enriched biofilm environment with distinct microbial communities. Because of its unique position at the air-sea interface, the SML is central to a range of global biogeochemical and climate-related processes.
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