A Functional Biology of Sea Anemones - download pdf or read online

By J. Malcolm Shick

ISBN-10: 9401053650

ISBN-13: 9789401053655

ISBN-10: 9401130809

ISBN-13: 9789401130806

General Editor: Peter Calow, division of Zoology, college of Sheffield, England the most objective of this sequence might 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 Junctional biology - is the best way organisms collect after which utilize assets in metabolism, move, development, copy, and so forth. those techniques will shape the elemental framework of all of the books within the sequence. each one publication will pay attention to a selected taxon (species, relations, classification or perhaps phylum) and should compile details 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. via targeting taxa that are renowned, it's was hoping that the sequence won't in simple terms illustrate the luck of choice, but additionally convey the restrictions imposed upon it by means of the physiological, morphological and developmental obstacles of the teams. one other very important characteristic of the sequence may be its organismic orientation. each one e-book will emphasize the significance of practical integration within the daily lives and the evolution of organisms. this can be an important considering the fact that, even though it can be real that organisms might be regarded as collections of gene­ decided features, they however engage with their surroundings as built-in wholes and it's during this context that particular features were subjected to normal choice and feature evolved.

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Additional resources for A Functional Biology of Sea Anemones

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In conjunction with his schematic model, McFarlane (l984a) has provided a conceptual overview of the functioning of the actiniarian neuromuscular system, at least in Calliactis parasitica. Multipolar nerve cells are viewed as pattern-generating motor neurons that drive particular behaviours directly. Presumably these neurons contain Antho-RWamide I (see above). The behavioural programs may be modified by input from extero- and enteroceptors via the TCNN, SSI and SS2. Although the SSI and SS2 have some immediate effects, they are viewed more as switching the output of pacemakers from one phase of spontaneous activity to another.

Xanthogrammica by UV may spread beyond those irradiated. The high sensitivity of both species to light having a wavelength of 500 nm is similar to that of photoreceptors in general. senile seem due to the ectodermal melanin and carotenoid pigments filtering the 24 Overview of sea anemones light before it reaches endodermal receptors, rather than to the presence of additional photosensitive pigments (North and Pantin, 1958). 3). Although the foregoing behaviours in the Anthopleura xanthogrammica have optimum wavelengths that do not correspond to chlorophyll action spectra and so are not mediated by intracellular oxygen production in its zooxanthellae, experiments by Fredericks (1976) and Shick and Brown (1977) nevertheless indicate the presence of oxygen receptors in zooxanthellate anemones.

A local contraction causes a rise in coelenteric pressure, and every muscle must now do more work if it is to shorten than was necessary before'. Therefore it is important that the basal coelenteric 12 Overview of sea anemones pressure be as low as possible - just enough to sustain inflation of the body and to keep it from collapsing under its own weight. This is indeed the case, and the ciliary currents on the siphonoglyph provide the 'trickle charge' to maintain this basal pressure of less than 10 mm H 2 0 (Batham and Pantin, 1950a).

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A Functional Biology of Sea Anemones by J. Malcolm Shick

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