Download A Functional Biology of Sea Anemones by J. Malcolm Shick PDF

By J. Malcolm Shick

General Editor: Peter Calow, division of Zoology, collage of Sheffield, England the most goal of this sequence might be to demonstrate and to provide an explanation for the best way organisms 'make a dwelling' in nature. on the middle of this - their Junctional biology - is the way in which organisms collect after which utilize assets in metabolism, circulate, development, copy, and so forth. those tactics will shape the basic framework of the entire books within the sequence. every one e-book will be aware of a selected taxon (species, kinfolk, type or maybe 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 additionally to contemplate why they've got come to paintings in that approach. via focusing on taxa that are renowned, it truly is was hoping that the sequence won't basically illustrate the good fortune of choice, but in addition exhibit the limitations imposed upon it via the physiological, morphological and developmental barriers of the teams. one other very important function of the sequence can 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 can be the most important considering, notwithstanding it can be real that organisms might be regarded as collections of gene­ made up our minds characteristics, they however engage with their atmosphere as built-in wholes and it really is during this context that exact characteristics were subjected to normal choice and feature evolved.

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Additional resources for A Functional Biology of Sea Anemones

Sample text

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).

Furthermore, dimensional changes occurring during discharge of the shaft are consistent with an osmotically generated increase in the volume of the nematocyst, whereas the evagination of the tube is driven by the release of tension stored in its twists and coils during nematogenesis (Godknecht and Tardent, 1988). Additional complications include the structural diversity of cnidae, which might imply different discharge mechanisms (Fautin and Mariscal, 1990), and the effects of different isolation procedures on the discharge characteristics of nematocysts (Hidaka and Mariscal, 1988).

Minasian in Fautin and Mariscal, 1990). Quaglia and Grasso (1986) described similar subepidermal plexuses at the bases of both the ectoderm and endoderm, each having both bipolar interneurons and multipolar motor neurons, as well as connections to ectodermal and endodermal sensory receptors. 7). Neuroethological evidence indicates that in some active species the pathways from ectodermal receptors in the column to endodermal effectors in the mesenteries must be more extensive (the transmesogleal system, TMS, proposed by Lawn, 1980), and anatomical studies at least hint that this is so (Robson, 1963, 1965).

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