By Tom Fenchel
This ebook is written for ecologists and protozoologists. Ecologists who examine environments and biotic groups during which protozoa are im ponant should still locate this publication particularly worthwhile. over the last decade it has turn into transparent that protozoa play vital roles in usual eco platforms, yet few ecologists have a sense for the sensible houses and the range of those organisms. Protozoa pose or exemplify many basic difficulties of inhabitants and neighborhood ecology, and of evo lutionary biology. In so much respects the overall ecological propenies of protozoa aren't essentially various from these of bigger organisms; but, as a result of their small measurement, brief new release occasions, and ubiquitous oc currence they typically current ecological phenomena in a brand new and dif ferent mild. To this could be further that protozoa are well-suited for experimental paintings. regardless of those merits, the learn of protozoa has performed a comparatively modest function within the improvement of ecology and ev olutionary biology, basically, i feel, simply because such a lot ecologists are strange with those organisms. i am hoping this ebook will allure extra awareness to those favorable features of protozoa. I additionally desire that this e-book could make protozoologists conscious of new features in their puppy organisms. for a very long time (that is, until eventually the joys damental contrast among prokaryotic and eukaryotic cells was once rec ognized) protozoa have been believed to symbolize the easiest kind of lifestyles. They have been accordingly widely used for the experimental learn of uncomplicated questions of mobilephone biology.
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Extra resources for Ecology of Protozoa: The Biology of Free-living Phagotropic Protists
One way to visualize the difference between taxic responses and the two other types is to take a glass container with a suspension of green flagellates. On one side of the container a beam of light shines through a convex lens so that the light is focused at a point in the middle of the tank. Flagellates which employ phototaxis will then gather at the wall of the container closest to the lens, although by doing so they congregate where the light is least intense. This is because they orient themselves relative to the direction of the light.
3) propel themselves with a tentacle which contracts periodically, acting rather like a piston. , the dinoflagellate Noctiluca) propel themselves by deformations of the entire cell brought about by contractions of "myonemes"-contractile fibrilla. In the peculiar oceanic heliozoan Sticboloncbe, the spicules are moved like oars to produce swimming (see Febvre-Chevalier & Febvre, 1982, and references therein). A species of Vorticella uses the contractile stalk for swimming rather than for permanent attachment like other vorticellids and the pelagic oligotrich Tontonia, has a posterior, long appendage for swimming.
Amoeba proteus, scale bar: 100 ~tm. Band C. Pelomyxa palustris, in C ingesting an algal filament. Scale bar (in B): 100 ~tm . D and E. The heliozoan Actinospbae rium eicborni, showing the actinopods and (in D) an ingested rotifer; scale bars: 50 ~tm. F. The heliozoan Actinopbrys sol; scale bar: 50 ~tm. }. ) 24 Chapter 2 Ecological Physiology: Motility axopodia are not always involved in locomotion. Some heliozoa roll along the substratum by alternately shortening and extending their axopods. This is the result of the assembly and disassembly of microtubules.