D.W. Sims's Advances in Marine Biology, Vol. 53 PDF

By D.W. Sims

ISBN-10: 012374119X

ISBN-13: 9780123741196

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

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Some authors have suggested that at least some of the variation within families is an adaptive response to living in a variable environment. At this time however, there are few experimental studies and too little theoretical work to generalize’. Therefore, despite the intuitive appeal of intra-clutch variation in offspring size as a mechanism for coping with environmental heterogeneity, theoretical evidence for the concept remains elusive. We suggest that the ubiquitous variation in offspring size seen within clutches does not solely occur due to constraints on producing offspring of The Evolutionary Ecology of Offspring Size in Marine Invertebrates 39 uniform size and may yet have an adaptive explanation.

We would argue that offspring size is probably a reasonable reflection of offspring energetic content for a number of reasons. 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.

Thus, even small differences in maternal provisioning can result in differential survivorship, and this raises an interesting possibility concerning planktotrophs. Given the range of offspring sizes over which survival differences are observed in lecithotrophs and direct developers, we believe that the degree of variation in settler sizes was induced by egg size in planktotrophs, means that post-metamorphic effects of egg size in the group should not be ruled out. We propose a number of predictions with regard to offspring-size effects on post-metamorphic performance, all of which should be relatively straightforward to test.

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

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