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Download A Functional Biology of Parasitism: Ecological and by Gerald W. Esch, Jacqueline C. Fernández (auth.) PDF

By Gerald W. Esch, Jacqueline C. Fernández (auth.)

Series Editor: Peter Calow, division of Zoology, college of Sheffield, England the most goal of this sequence may be to demonstrate and to provide an explanation for the way in which organisms 'make a dwelling' in nature. on the middle of this - their useful biology - is the best way organisms collect after which utilize assets in metabolism, stream, progress, copy, etc. those tactics will shape the elemental framework of all of the books within the sequence. every one e-book will be aware of a selected taxon (species, family members, category or perhaps phylum) and should assemble info at the shape, body structure, ecology and evolutionary biology of the crowd. the purpose can be not just to explain how organisms paintings, but additionally to contemplate why they've got come to paintings in that method. via focus on taxa that are renowned, it truly is was hoping that the sequence won't purely illustrate the good fortune of choice, but additionally express the restrictions imposed upon it via the physiological, morphological and developmental barriers of the teams. one other vital function of the sequence may be its organismic orientation. every one e-book will emphasize the significance of practical integration within the day­ to-day lives and the evolution of organisms. this is often the most important considering, although it can be precise that organisms will be regarded as collections of gene­ made up our minds qualities, they however have interaction with their setting as built-in wholes and it truly is during this context that particular characteristics were subjected to common choice and feature evolved.

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Extra resources for A Functional Biology of Parasitism: Ecological and evolutionary implications

Sample text

Tacerca~ ~ Snail Ostracod ~socerc~ ~ ~"''''''''' ~ia-Sporo~ . : .... :' .... 2 A schematic life cycle for the trematode, Halipegus occidualis. The symbols are explained in the caption for Fig. 1 (page 7). cystophorous cercaria, also called a cercariocyst (Fig. 3a, b). These cercariocysts are non-motile, but they have a relatively long life span (Fig. 4) that is inversely related to water temperatures in the pond (Shostak and Esch, 1990b). There is a strong indication that cercariocysts are in an anhydrobiotic state when they are released from the snail (Goater, Browne and Esch, 1990) and that this accounts for their extended life span.

Another example of an underdispersed distribution is Deretrema philippinensis, a gall bladder trematode in the flashlight fish, Anomalops katopron. Bum (1980) and BeverleyBurton and Early (1982) consistently found two trematodes per gallbladder, with an incidence of almost 100%. Again, however, the mechanism responsible for this distribution pattern has not been determined. Neither random nor regular frequency distributions are that common in nature. By far the most common form of frequency distribution is overdispersion, or contagion.

As stated by Butterworth (1990), it is a 'subtle adaptation toward the establishment of a stable host-parasite relationship'. The mechanisms by which the adult parasites escape the host's immune response are as yet unknown despite intensive study over the years. However, some investigators are convinced that the parasite incorporates host proteins in a process known as antigen sharing, and thus masks the parasite from the host. Others suggest that the parasite becomes immunologically 'inert' with the loss of capacity by the parasite to express antigens in its tegumental surface that would be perceived as foreign by the definitive host (Butterworth, 1990).

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