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• W2240724295 abstract "Kesaniemi, Jenni Variation in developmental mode and its effects on divergence and maintenance of populations Jyvaskyla: University of Jyvaskyla, 2012, 47 p. (Jyvaskyla Studies in Biological and Environmental Science ISSN 1456-9701; 243) ISBN 978-951-39-4818-4 (nid.) ISBN 978-951-39-4819-1 (PDF) Yhteenveto: Kehitysmuotojen variaatio ja sen populaatiogeneettiset seuraukset Diss. For invertebrates with complex life cycles in which one or more larval stages precede the adult stage, developmental mode is a key life-history characteristic. A variety of different larval developmental modes are seen among marine invertebrate species and the different modes typically have differing dispersal potential, and this consequently affects population-level gene flow and genetic differentiation, especially in species were adults are sessile. The spionid polychaete Pygosio elegans can produce small free swimming larvae feeding in the plankton, or benthic larvae feeding on nurse eggs while brooded in egg capsules in the maternal tube. Support for poecilogony in P. elegans was found using DNA sequence data and phylogenetic analyses: divergence in the COI gene was low and haplotypes were shared among populations with different larval modes. In population genetic analyses with newly developed genetic markers, genetic variation and effective population size were found to be higher in populations were the planktonic larval mode predominates, compared to populations with benthic larvae. Populations with benthic larvae were also more prone to the effects of genetic drift and were temporally unstable. Isolation by distance pattern and significant genetic structure was seen among most population pairs in Europe, despite larval mode. These results and the high estimated local recruitment rates suggest that the larval dispersal may not be tightly correlated with the developmental mode in this species and that factors other than dispersal may be affecting the genetic structure seen. On a small geographical scale, no habitat characteristics were found to significantly affect the observed genetic structure, but on a larger scale, the developmental mode may be associated with geography or environmental factors. Because of the observed polymorphism in developmental mode seen in P. elegans, it is a good model species for research on the mechanisms and consequences of life history variation." @default.
• W2240724295 created "2016-06-24" @default.
• W2240724295 creator A5049215288 @default.
• W2240724295 date "2012-01-01" @default.
• W2240724295 modified "2023-09-28" @default.
• W2240724295 title "Variation in developmental mode and its effects on divergence and maintenance of populations" @default.
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