Download A Functional Biology of Free-Living Protozoa by Johanna Laybourn-Parry BSc, MSc, PhD (auth.) PDF

By Johanna Laybourn-Parry BSc, MSc, PhD (auth.)

General Editor: Peter Calow, division of Zoology, college of Sheffield, England the most goal of this sequence could be to demonstrate and to give an explanation for the way in which organisms 'make a dwelling' in nature. on the center of this - their func­ tional biology - is the way in which organisms collect after which utilize assets in metabolism, flow, progress, copy, etc. those techniques will shape the basic framework of the entire books within the sequence. each one e-book will be aware of a selected taxon (species, family members, classification or perhaps phylum) and should collect info at the shape, body structure, ecology and evolutionary biology of the crowd. the purpose might be not just to explain how organisms paintings, but in addition to think about why they've got come to paintings in that manner. through focusing on taxa that are renowned, it really is was hoping that the sequence won't in basic terms illustrate the good fortune of choice, but in addition express the restrictions imposed upon it through the physiological, morphological and developmental limita­ tions of the teams. one other very important characteristic of the sequence can be its organismic orienta­ tion. every one ebook will emphasise the significance of practical integra­ tion within the day by day lives and the evolution of organisms. this is often the most important when you consider that, although it can be actual that organisms will be regarded as collections of gene-determined qualities, they however have interaction with their setting as built-in wholes and it's during this context that exact features were subjected to common choice and feature evolved.

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Additional resources for A Functional Biology of Free-Living Protozoa

Sample text

Channels a few micrometres wide and between 15-50 micrometres long developed in the cytoplasm from which vesicles fragmented into the cell. These authors suggested that pinocytotic activity in amoebae serves to compensate for a loss of water to the medium. Later work by ChapmanAndersen and Prescott (1956) on Chaos chaos and Amoeba proteus confirmed this pattern, though they suggested that pinocytosis may serve an additional nutritional role. Pinocytosis is performed by Tetrahymena when cultured axenically in proteose-peptone medium.

Studies on Paramecium have revealed an elaborate system of microtubular ribbons which arise at the left side of the cytopharynx and fan out into the cytoplasm, where some pass to the cell anus or cytoproct (Allen, 1974). Membrane is retrieved at the cytoproct and moved along the microtubular ribbons to the cytopharynx, where it enters the discoidal vesicle pool (Allen and Fok, 1980). In Climacostomum the membrane of defaecation vacuoles has been seen to be retained in the cell and fragments to form vesicles which are presumably recycled to the cytopharynx (Fischer-Defoy and Hausmann, 1982).

Some species feed on bacteria and are therefore microbivores in the decomposer food chain, while others feed on algae, usually the unicellular variety, and are thus herbivores. Both trophic groups are exploited by carnivorous Protozoa, many of which also feed on other micro- and meiofauna such as rotifers, gastrotrichs and small crustaceans. Within the Protozoa we find a spectrum of trophic types autotrophs, primary consumers and secondary consumers all inter· related in a complex community food web.

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