By Michael J. Leboffe, Gary D. Wisehart, Erin C. Rempala
This booklet is a full-color complement that gives pictures of preserved specimens and pictures taken at numerous aquaria to supply insurance of organisms within the world's oceans. it's designed to accompany any marine biology textual content or laboratory guide.
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They are characterized by having a so-called tinsel flagellum with “hairs” made of a basal attachment, a hollow shaft, and glyco protein filaments split into three parts at the ends. A second smooth whiplash flagellum also is often present. There are three groups of autotrophic stramenopiles: diatoms, the golden algae (which are not well represented in marine environments), and the brown algae. Only diatoms are covered in this chapter; the brown algae are covered in Chapter 32. The fourth group, oomycetes or water molds, are colorless and heterotrophic.
A gradient of sulfur compounds runs in the opposite direction. The different amounts of oxygen and sulfur compounds leads to layering of microbial communities adapted to that specific environment. This illustration is a generalized picture of the layering that you might see in a mature column. ) Starting at the top and working downward the layers are: air, water (containing algae and cyanobacteria), aerobic mud (sulfur-oxidizing bacteria), microaerophilic mud (non-sulfur, photosynthetic bacteria), red/purple zone ( purple photosynthetic bacteria), green zone (green photosynthetic bacteria), and black anaerobic zone (sulfur-reducing bacteria).
Living in an organ called a trophosome (troph—feed, soma—body). These, in turn, oxidize the sulfur (they extract the energy from it) and produce organic compounds from CO2, which can be used as food by both the bacteria and Riftia. As Riftia has no digestive tract, this is an obligate mutualistic endosymbiosis. In a way, Riftia can be viewed as an autotrophic animal! A second group of sulfur-oxidizing bacteria are phototrophs. These include the purple and green sulfur bacteria that perform bacterial photosynthesis, a process that differs from plants and cyanobacteria in that different chlorophylls are used and oxygen is not a byproduct (anoxygenic; an— not).
A Photographic Atlas of Marine Biology by Michael J. Leboffe, Gary D. Wisehart, Erin C. Rempala