Algae - phytoplankton an important source of oxygen and the...

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Algae Algae are a polyphyletic group (therefore lacking any formal taxonomic validity, but still a useful term) that includes several smaller monophytletic groups. The fossil record of algae dates to the precambrian time (possible algae have been recovered from the Bitter Springs Formation rocks dated to between 1.2 and 1.4 billion years old), with undeniable algae appearing during the Paleozoic Era, by about 500 million years ago. Most algae use photosynthesis at least part of the time. Algae are subdivided by their type of wall, photosynthetic pigments, and method of food storage. Photosynthetic pigments and storage of sugars are quite diverse within the algae.Algae are major components of the
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Unformatted text preview: phytoplankton , an important source of oxygen and the base of many food webs in the oceans and freshwater. Body styles range from single-celled to colonial (possibly simple multicellular). Kingdom Stramenopila This proposed kingdom includes the diatoms, golden algae, brown algae, and water molds. All members of this kingdom have numerous hair-like projections from their flagellae. The monophyletic nature of this group has been established by molecular systematic methods. When they are photosynthetic, chlorophyll c is the main accessory pigment. This kingdom includes diatoms, giant kelps, and mildews, making it a very diverse group both in terms of lifestyle as well as the size iof organisms....
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