Download A Photographic Atlas of Marine Biology by Gary D. Wisehart, Erin C. Rempala, Michael J. Leboffe, David PDF

By Gary D. Wisehart, Erin C. Rempala, Michael J. Leboffe, David Ferguson

This booklet is a full-color complement that offers photos of preserved specimens and photographs taken at a variety of aquaria to supply assurance of organisms within the world's oceans. it's designed to accompany any marine biology textual content or laboratory handbook. 3-hole drilled

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Compare the appearance of these diatom ­relics with the living forms in Figure 4-8. The ornamentation on their frustules is much more apparent. (hapt—to grasp, nema—thread) extending from the cytoplasm between the two flagella. It is composed of mem­ branous layers surrounding seven microtubules, so is fundamentally different in structure from eukaryotic ­flagella, which have the 9+2 arrangement of microtubules within (nine pairs surrounding two single microtubules). The haptonema is a feeding structure that gathers food particles and delivers them to a food vacuole (vacuus— empty, ole—diminutive suffix) at the posterior of the cell.

This continues until the frustule reaches a critically small size, at which time the nucleus undergoes meiosis to produce gametes that are released. Fertilization produces a new cell and the cycle repeats. Many pennate diatoms are motile by a gliding mechanism, which serves them well as they are most commonly found in sediments. Centric diatoms are nonmotile and are most frequently found in the plankton. Haptophyta Haptophytes are unicellular algae with two smooth flagella. They are distinguished by the presence of a haptonema m 4-7 Geologically Recent Marine Diatoms—Strew F ­ requently in biology classes diatom diversity is studied using slides made from diatomaceous earth, which contains the empty frustules of deceased diatoms in great abundance.

Cyanobacteria (cyan—dark blue) are photoautotrophs (though some are photoheterotrophs. Like the true plants and other eukaryotic autotrophs, they perform oxygenic (oxy—oxygen, genic—to produce) photosynthesis in which m m 20 A Photographic Atlas of Marine Biology SECTION 2 Marine Bacteria, Archaeans, and Protists oxygen is a waste product (Table 2-5). They are easily seen without staining because of their combination of photosynthetic pigments, which confer on them a bluish-green color (and sometimes others).

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