By Alan J. Southward, Craig M. Young, Lee A. Fuiman
Quantity forty three is an eclectic quantity with reports on ecology and biogeography of marine parasites; fecundity: features and position in life-history thoughts 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 was once first released in 1963. Now edited by way 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 studies on quite a lot of subject matters with a purpose to entice postgraduates and researchers in marine biology, fisheries technology, ecology, zoology, oceanography. Eclectic volumes within the sequence are supplemented through thematic volumes on such themes as The Biology of Calanoid Copepods . Key beneficial properties * AMB first released 1963 * This quantity offers a range of experiences at the biology of lesser-known taxa of the phylum Mollusca, together with: * The quite often 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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Additional resources for Advances in Marine Biology, Vol. 43
With permission from Elsevier Science. C and D reproduced from: Poulin, R. and Rohde, K. (1997). Comparing the richness of metazoan ectoparasite communities of marine fishes: controlling for host phylogeny. Oecologia 110, 278-283, with permission from Springer Verlag. 50 KLAUS ROHDE A x Atlantic& Pacificcoasts of Canada • Antarctic • TropicalIndo-Pacific ~10 o to. ~_ o. 6 ffl x o x x x~ 4 x E xx r- x X x x x ~ x xx x ~U ~1111 • • • x x o x• x x X XX = 2 x x ~ x • x x Ln ( m e a n n u m b e r of parasites per host +1) B ~10 o t- =' Antarctic o "Deepwater"NSW ,, NorthernNSW o PacificCanada Brazil • • • Argentina • TropicalIndo-Pacific ~4 E • • e= 2 o=x~oO ii D = o .
In many fish species, gills are completely empty or only one small microhabitat is occupied; the niche is ECOLOGY AND BIOGEOGRAPHYOF MARINE PARASITES 27 not wider, and it does not expand in the absence of competitors (see also Rohde, 1981). Many authors have used reduction of niche overlap as evidence for the evolutionary importance of interspecific competition. An important method used to study interactions between species is the application of similarity indices, but most indices are symmetrical, and assume that each species affects the other equally.
Parasitic infection can lead to a shift in the mean value of the trait (in either direction) and increase the variance, depending on the intensity of infection. If prevalence of infection is high, the distribution may be displaced but remain normal, if prevalence is greater, the distribution may become skewed. If parasite infection leads to a large shift in phenotype, and if prevalence of infection is below 100%, the distribution can become bimodal. They cite the work of Lauckner (1984) on parasite effects on North Sea snails.