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Advances in Marine Biology, Vol. 53 by D.W. Sims

By D.W. Sims

Advances in Marine Biology used to be first released in 1963. Now edited by means of David W. Sims (Marine organic organization, UK), the serial publishes in-depth and updated reports on quite a lot of themes with the intention to attract postgraduates and researchers in marine biology, fisheries technology, ecology, zoology, oceanography. Eclectic volumes within the sequence are supplemented via thematic volumes on such issues 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 very important info at the social constitution and methods of delphinids * greater than 250 pages of the most recent discoveries in marine technology

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For example, for B. neritina colonies that come from populations that are highly seasonal with mortality at the end of the summer, larval size affects the time until reproduction with colonies from larger larvae reproducing before colonies from smaller larvae (Marshall, 2005). In contrast, for colonies where there are high rates of predation but colonies as a whole persist year round, larval size affects growth rates and fecundity much more strongly (Marshall, 2005). Although direct evidence is limited, the strong effects of larval size on postmetamorphic growth suggest that larval size will also affect reproduction in a range of taxa (especially colonial organisms) but more tests are needed.

This is probably due to the fact that a number of these studies The Evolutionary Ecology of Offspring Size in Marine Invertebrates 23 focus on colonial invertebrates where post-metamorphic survival and growth are easily quantified. The majority of studies examining offspringsize effects for this group involve field studies where larvae are measured in the laboratory, settled onto artificial substrata and then transplanted into the field. However, the effects of larval size on post-metamorphic growth are not restricted to colonial organisms.

Hence for any given larva, the larval period is a product of the availability of suitable substrates and the size of the larva. The effect of larval size on the developmental time/settlement behaviour of non-feeding larvae has some interesting implications for variation in the dispersal potential of this group. All else being equal, larger larvae will have greater dispersal than smaller larvae. Thus, if a mother produces offspring of variable size, then she will also produce offspring that are likely to disperse to varying amounts.

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