By Johanna Laybourn-Parry BSc, MSc, PhD (auth.)
General Editor: Peter Calow, division of Zoology, college of Sheffield, England the most target of this sequence might be to demonstrate and to provide an explanation for the way in which organisms 'make a residing' in nature. on the middle of this - their func tional biology - is the way in which organisms collect after which utilize assets in metabolism, stream, progress, copy, etc. those strategies will shape the elemental framework of the entire books within the sequence. every one ebook will be aware of a selected taxon (species, family members, category or perhaps phylum) and should assemble details at the shape, body structure, ecology and evolutionary biology of the gang. the purpose should be not just to explain how organisms paintings, but in addition to contemplate why they've got come to paintings in that method. by means of focusing on taxa that are renowned, it's was hoping that the sequence won't in basic terms illustrate the good fortune of choice, but in addition convey the limitations imposed upon it via the physiological, morphological and developmental limita tions of the teams. one other vital characteristic of the sequence should be its organismic orienta tion. each one ebook will emphasise the significance of useful integra tion within the daily lives and the evolution of organisms. this can be an important considering, even though it can be real that organisms should be regarded as collections of gene-determined qualities, they however have interaction with their surroundings as built-in wholes and it really is during this context that specific qualities were subjected to ordinary choice and feature evolved.
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Extra resources for A Functional Biology of Free-Living Protozoa
Presumably those protozoans which are not retained when they make contact with suctorian tentacles, lack the appropriate chemical make-up on their cell surface. The ciliate predator Didinium, which is generally believed to feed exclusively on species of the genus Paramecium, can be made to prey on other ciliates experimentally. Clones of didinia which feed on Colpidium have been produced (Berger, 1979). The Didinia become 'imprinted' on this smaller prey species, although they still retain a diminished ability to attack Paramecium aurelia and to a lesser extent P.
Factors Influencing Feeding The amount of energy ingested and the rate of ingestion are influenced by both biological and environmental factors. Among the biological factors is the type or species of food available. Protozoa exercise selectivity in their feeding behaviour; thus when the preferred species in the repertoire of food exploited is sparse or absent there will naturally be an impact on the rate of energy ingestion and the overall quantity consumed. Where several protozoan species have overlapping food preferences, as will certainly be the case in many communities, the dimension of competition enters as a factor playing a role in determining feeding rate.
The rodorgan detaches from the prey, moves over its surface and reattaches at another point, while the body of Peranema continues to move forwards. Thus ingestion is achieved by repeating attaching, pushing, detaching and reattaching of the rodorgan. The whole process requires 2-15 minutes (Chen, 1950). The movement of the rodorgan is performed by an elaborate arrangement of articulating lamellae connected to the bases of the pair of rods in the organ (Nisbet, 1984). 9: The Process of Ingesting a Filamentous Alga in Nassula.