By Alan J. Southward, Craig M. Young, Lee A. Fuiman
Quantity forty three is an eclectic quantity with experiences on ecology and biogeography of marine parasites; fecundity: features and position in life-history suggestions of marine invertebrates; the ecology of Southern Ocean Pack-ice; and organic and distant sensing views of pigmentation in coral reef organisms. Advances in Marine Biology used to be first released in 1963. Now edited by means of A.J. Southward (Marine organic organization, UK), P.A. Tyler (Southampton Oceanography organization, UK), C.M. younger (Harbor department Oceanographic establishment, united states) and L.A. Fuiman (University of Texas, USA), the serial publishes in-depth and updated experiences on a variety of themes for you to attract postgraduates and researchers in marine biology, fisheries technological know-how, ecology, zoology, oceanography. Eclectic volumes within the sequence are supplemented by means of thematic volumes on such themes as The Biology of Calanoid Copepods . Key positive factors * AMB first released 1963 * This quantity offers a variety of studies at the biology of lesser-known taxa of the phylum Mollusca, together with: * The in general diminutive protobranch bivalves * The slug-like shelled opisthobranchs * The hugely really good and evolutionarily complicated tusk shells * the attractive, precious, but frustratingly hard-to-collect slit shells
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Extra resources for Advances in Marine Biology, Vol. 43
In monopisthocotylean Monogenea, terminal globules have not been found so far, and the only species tested did not react to magnetic fields, lending some support to the assumption that the terminal globules are indeed involved in magnetic orientation. 42 KLAUS ROHDE tg Figure 16 Oncomiracidium of a polyopisthocotylean monogenean. Note the terminal globule (tg). ) As discussed above, all parasites show preferences for certain host species and microhabitats within or on hosts. Work on host and microhabitat finding was reviewed by Rohde (1994a).
Examining a number of non-marine examples, they concluded that extinctions at the levels of infrapopulations and infracommunities are common, but without serious effects on the survival of the parasites. At higher levels, extinctions are possible if meta- or "suprapopulations" (the latter even more inclusive than metapopulations) become extinct. However, suprapopulations are highly complex and they are unlikely to become extinct due to host fragmentation, because reinvasion may occur from surviving fragments (rescue effect).
To measure host specificity, Rohde (1980d, 1993, 1994a) proposed a host specificity index as follows: Si(intensity) -- Y~(xij/njhij) ~(xq/nj) where S i -~-host specificity of ith parasite species, xq = number of parasite individuals of ith species in jth host species, nj = number of host individuals in jth species examined, hij = rank of host species j based on intensity of infection xij/nj (species with greatest intensity has rank 1). Numerical values for the indices vary between 0 and 1: the higher the degree of host specificity, the closer to 1.
Advances in Marine Biology, Vol. 43 by Alan J. Southward, Craig M. Young, Lee A. Fuiman