J. Malcolm Shick's A Functional Biology of Sea Anemones PDF

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 target of this sequence might 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 Junctional biology - is the best way organisms collect after which utilize assets in metabolism, circulation, progress, replica, and so forth. those strategies will shape the basic framework of all of the books within the sequence. each one ebook will be aware of a specific taxon (species, kin, classification or perhaps phylum) and should assemble details at the shape, body structure, ecology and evolutionary biology of the crowd. the purpose could be not just to explain how organisms paintings, but additionally to think about why they've got come to paintings in that means. by way of targeting taxa that are popular, it really is was hoping that the sequence won't basically illustrate the good fortune of choice, but in addition express the limitations imposed upon it by way of the physiological, morphological and developmental boundaries of the teams. one other very important characteristic of the sequence might be its organismic orientation. every one booklet will emphasize the significance of practical integration within the day by day lives and the evolution of organisms. this is often the most important on the grounds that, even though it can be actual that organisms could 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 exact features were subjected to common choice and feature evolved.

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Additional info for A Functional Biology of Sea Anemones

Example text

These matters are considered in Chapters 3 and 5. g. 5) necessitate ultrastructural adaptations to maintain cellular functions. Some of these have been demonstrated by Holley in his studies of the basal apparatus of cilia, which anchor the cilia in epithelial cells and orient and coordinate their beat. In the myoepithelial cells of the mesenteries in Metridium senile, cilia have novel structures associated with their basal apparatus - flexible arched rootlets that can increase or decrease their span in the cell apex as the cell changes diameter (Holley, 1985).

Cnidocytes (cnida-secreting cells) and their receptors are providing important insights into the processes of exo- and endocytosis. Only anthozoans produce all three varieties of cnidae, and just as the Actiniaria are morphologically the most diverse order among the Anthozoa, so too is their cnidome (complement of cnidae) the most varied (Schmidt, 1974). g. feeding tentacle, catch tentacle, acontium) may have its own characteristic cnidome or size distribution of cnidae. Cnidae are taxonomically important characters within the sea anemones (Doumenc and Foubert, 1984; Fautin, 1988), both in defining higher taxa (Schmidt, 1974) and in identifying species within a difficult group (Manuel, 1988).

Subsequently North and Pantin (1958) demonstrated that local contractions of illuminated parietal muscles occur even if the mesentery is anaesthetized with Mg2+, which eliminates chemical synaptic transmission between neurons and at the myoneural junction. Finally, Marks (1976) found that Calamactis praelongus shows local contractions of the column unaccompanied by electrical activity in the nerve net (although it also shows more extensive responses coordinated by the nerve net). Thus it seems likely that the myoepithelial cells themselves are photosensitive.

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A Functional Biology of Sea Anemones by J. Malcolm Shick

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