Advances in Parasitology, Vol. 19 - download pdf or read online

By W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.)

ISBN-10: 0120317192

ISBN-13: 9780120317196

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Extra resources for Advances in Parasitology, Vol. 19

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HOST SELECTION The problems of host location and recognition are further compounded by the fact that copepods do not uniformly infect all individuals within host populations. This implies that either their chances of infecting different host individuals are not equal, or some individuals of the host species are more suitable than others. The former alternative usually has an ecological basis. For example, Walkey et al. (1970) found that the burden of Thersitina gasterostei (Pagenstecher, 1861) on sticklebacks, Gasterosteus aculeatus, was in part dependent on the salinity of the environment.

It is quite probable that all Caligidae possess similar organs and that they are sensory. The organ has not yet been investigated by histological methods, required to support the assertion of its function. Electron microscope studies are needed to confirm it; in particular, its innervation should be studied in great detail. In the meantime, the chemoreceptive function appears at least possible; the position of the organ lends support to this supposition. The point at which it is situated is the first to come in contact with the host, when the latter is located by the copepod.

The net effect of this modification of the cycle is a substantial reduction of its free-living part (Fig. 5C). The caligid copepods retain throughout their adult lives their ability to move freely over the surface of the host fish and to change the host individual. This ability begins at the first preadult stage. The life cycles of P A R A S I T I C COPEPODA : PROBLEMS A N D PERSPECTIVES 23 Lepeophtheirus dissimulatus (cf. Lewis, 1963) and that of L. hospitalis (cf. Voth, 1972) have two preadult stages.

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Advances in Parasitology, Vol. 19 by W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.)


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