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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/13599 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/13599 http://eprints.org/relation/isCoversheetVersionOf https://pure.iiasa.ac.at/id/document/13599 archive 351 disk0/00/01/02/07 2016-01-15 08:47:57 2021-08-27 17:22:55 2016-01-15 08:47:57 monograph show 3 Taborsky B. 1834 Heino M. 7602 0000-0003-2928-3940 Dieckmann U. 1668 0000-0001-7089-0393 pub iis_ecl prog_eep Body size is recognized as a major factor in evolutionary processes mediating sympatric diversificatin and community structuring. Life-history types with distinct body sizes can result from two fundamental mechanisms, size-dependent competition and size-dependent mortality. While previous theoretical studies investigated these two pocesses in separation, the model analyzed here allows both selective forces to affect body-size evolution interatively. Here we show for the first time that in the presence of size-dependent competition, size-dependent mortality can give rise to multiple, coexisting size morphs representing the final outcomes of evolution. Moreover, our results demonstrate that interactions between size-dependent competition and mortality can create characteristic abrupt changes in size strcture and nonmonotonic patterns of biological diversity along continuous and monotonic environmental gradients. We find that the two selective forces differentially affect the body-size ratios of coexisting morphs: size-dependent comptition results in small and relatively constant ratios, whereas size-dependent mortality can open niches for morphs that grealy differ in body size. We show that these differential effects result in characteristic distributions of size ratios across communities, which we suggest can help detect the concurrent action and relative influence of size-dependent competition an mortality in nature. 2012 published IR-12-072 IR-12-072 1604 122 66 public interim_report IIASA, Laxenburg, Austria 37 FALSE info:eu-repo/semantics/book