A Functional Biology of Scyphozoa - download pdf or read online

By Mary N. Arai (auth.)

ISBN-10: 9400914970

ISBN-13: 9789400914971

ISBN-10: 9401071691

ISBN-13: 9789401071697

Scyphozoa have attracted the eye of many varieties of individuals. Naturalists watch their sleek locomotion. Fishermen may well dread the swarms which may hinder fishing or devour larval fish. Bathers retreat from the water in the event that they are stung. humans from a few Asiatic international locations consume the medusae. Comparative physiologists study them as very likely easy versions for the functioning of assorted structures. This booklet integrates facts from these and different investigations right into a useful biology of scyphozoa. it is going to emphasize the wide variety of adaptive responses attainable in those morphologically rather uncomplicated animals. The booklet will be aware of the examine of the final 35 years, in part simply because there was a quick enlargement of information in the course of that interval, and in part simply because a lot of the former paintings used to be summarized by means of books released among 1961 and 1970. Bibliographies of papers on scyphozoa have been integrated in Mayer (1910) and Kramp (1961). Taxonomic diagnoses also are incorporated in these monographs, in addition to in a monograph at the scyphomedusae of the USSR released through Naumov (Naumov, 1961). such a lot impor­ tantly, a genenttion of scyphozoan employees has used as its 'bible' the monograph through F.S.Russell (1970) The Medusae of the British Isles. regardless of its restrictive identify, his ebook reports many of the details at the biology of scyphozoa as much as that date.

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Additional resources for A Functional Biology of Scyphozoa

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3). 6 Transmitters In higher animals transmission between neurons is due to movement of chemical transmitters across a synaptic cleft between the cells, or to electrical coupling via gap junctions. In the latter case, cell interiors are directly linked by aqueous channels through gap junctional particles, allowing movement of compounds (including experimental dyes) between the two cells. Gap junctions have been identified in hydrozoa where they form the basis for epithelial conduction.

Results from further use of the preparation by Mayer (1906) and subsequent workers to examine the responses of nerve and muscle to ions, etc. were difficult to interpret due to the inability to separate muscle, nerve and surrounding tissue. Passano (1982) reviewed this extensive literature in the light of modern physiology. Horridge (1953, 1954) first demonstrated directly that conduction depends on the presence of nerve fibres. It was known from histological staining that neurons, including a number of relatively large intercrossing bipolar cells, exist in the subumbrellar ectoderm of Aurelia aurita and Rhizostoma pulmo (see Schafer, 1878; Bozler, 1927a,b).

The subumbrellar surface of the exumbrella with its mesogleal joints can be seen proximal to the ring of coronal muscle. Ar = adradius; Ir = interradius; IC = coronal mesogleal joint; JR = radial mesogleal joint; MF = marginal flap; MuC = coronal swimming muscle; MuR = radial swimming muscle; Pr = perradius; Rh = rhopalium; RR =radial anchoring ridge connecting subumbrellar and exumbrellar mesoglea; T = remnant of tentacle. ) stretch have not been measured. Alexander (1964) examined the stretch of Cyanea capillata mesoglea under a constant tensile stress.

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A Functional Biology of Scyphozoa by Mary N. Arai (auth.)

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