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By D.W. Sims

Advances in Marine Biology used to be first released in 1963. Now edited via David W. Sims (Marine organic organization, UK), the serial publishes in-depth and up to date stories on a variety of subject matters in order to attract postgraduates and researchers in marine biology, fisheries technological know-how, ecology, zoology, oceanography. Eclectic volumes within the sequence are supplemented through thematic volumes on such subject matters as The Biology of Calanoid Copepods and Restocking and inventory Enhancement of Marine Invertebrate Fisheries . * New info at the offspring measurement in marine invertebrates * Discusses vital details at the social constitution and methods of delphinids * greater than 250 pages of the most recent discoveries in marine technology

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First, the most common method by which the energetic content of eggs was estimated in many of the studies that found no relationship between offspring size and energy content was the dichromate oxidation technique as modified by McEdward and Coulter (1987). This technique is now viewed as producing unreliable results for a number of reasons (Gosselin and Qian, 1999; Pernet and Jaeckle, 2004), and so the lack of a relationship may be due to methodological problems. Second, the lack of a significant relationship within some species is almost certainly due to a Type II error as a result of a lack of statistical power.

This correlation can be negative, for example in Conus marmoreus, egg size is negatively correlated with maternal size (Kohn and Perron, 1994) and in B. neritina, larval size can be positively or negatively correlated with colony size (Marshall, 2005). 3 is probably not an accurate representation of reality given that in many cases the absence of a relationship between maternal size and offspring size is unlikely to be reported. Therefore, the percentage of species where no relationship is present is probably dramatically underestimated.

Our own work on brooding species has shown that larger larvae actually spend longer in the plankton than smaller larvae, at least for species with brooded larvae (Marshall and Keough, 2003). However, this is not due to differences in the developmental time of larvae, indeed the larvae of each of the species in our study were capable of settlement immediately (Marshall and Keough, 2003). The differences appear to be due to the fact that larger larvae are more ‘choosy’ with respect to settlement surfaces.

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