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      Fish reproductive-energy output increases disproportionately with body size

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      Science

      American Association for the Advancement of Science (AAAS)

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          Life Historical Consequences of Natural Selection

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            A general model for ontogenetic growth.

            Several equations have been proposed to describe ontogenetic growth trajectories for organisms justified primarily on the goodness of fit rather than on any biological mechanism. Here, we derive a general quantitative model based on fundamental principles for the allocation of metabolic energy between maintenance of existing tissue and the production of new biomass. We thus predict the parameters governing growth curves from basic cellular properties and derive a single parameterless universal curve that describes the growth of many diverse species. The model provides the basis for deriving allometric relationships for growth rates and the timing of life history events.
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              Relationships between body size and some life history parameters.

              Patterns in life history phenomena may be demonstrated by examining wide ranges of body weight. Positive relationships exist between adult body size and the clutch size of poikilotherms, litter weight, neonate weight life span, maturation time and, for homeotherms at least, brood or gestation time. The complex of these factors reduces r max in larger animals or, in more physiological terms, r max is set by individual growth rate. Comparison of neonatal production with ingestion and assimilation suggests that larger mammals put proportionately less effort into reproduction. Declining parental investment and longer development times would result if neonatal weight is scaled allometrically to adult weight and neonatal growth rate to neonatal weight. Body size relations represent general ecological theries and therefore hold considerable promise in the development of predictive ecology.
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                Author and article information

                Journal
                Science
                Science
                American Association for the Advancement of Science (AAAS)
                0036-8075
                1095-9203
                May 10 2018
                May 10 2018
                May 11 2018
                : 360
                : 6389
                : 642-645
                Article
                10.1126/science.aao6868
                c2ba004c-a860-4c6b-9c6b-488f02198ba1
                © 2018

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