Does Body Size Optimization Result in Skewed Body Size Distribution on a Logarithmic Scale?

Kindlmann,; Dixon, A. F. G.; Dostalkova,

doi:10.2307/2463697

Cited by 14 publications

(21 citation statements)

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“…We stress that future studies should reconcile the cellular and physiological (1-3) mechanisms associated with growth rate evolution, and should investigate their role in the origin of metabolic scaling variability on different levels of biological organization. Successful integration of these phenomena promises evolutionary explanations of different large-scale phenomena such as Bergmann's rule in ectotherms or patterns in interspecific body size distributions and life histories (Kozlowski and Weiner, 1997;Kindlemann et al, 1999;Kozlowski and Gawelczyk, 2002;Angilletta and Dunham, 2003;Kozlowski et al, 2003;Kozlowski et al, 2004).…”

Section: Linking Metabolic Scaling Growth and Cell Size -Future Prosmentioning

confidence: 99%

“…Metabolic scaling is expected to affect optimal resource allocation to growth and reproduction, so it should substantially influence the life history of organisms (Kozlowski and Teriokhin, 1999;Czarnolę ski et al, 2003). Emerging evidence suggests that adaptive allocation responses to shifts in metabolic scaling can explain different ecological and evolutionary phenomena, such as the so-called 'temperature-size rule' in ectotherms (slower growth and larger final body size in colder environments) (Angilletta and Dunham, 2003;Kozlowski et al, 2004), or the interspecific patterns of body size distributions and life history allometries (Kozlowski and Weiner, 1997;Kindlemann et al, 1999;Kozlowski and Gawelczyk, 2002). In this work we examine the link between size-scaling of metabolism and growth rate in Helix aspersa snails.…”

Section: Introductionmentioning

confidence: 99%

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Scaling of metabolism inHelix aspersasnails: changes through ontogeny and response to selection for increased size

Czarnołęski

Kozłowski

Dumiot

et al. 2008

Journal of Experimental Biology

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SUMMARYThough many are convinced otherwise, variability of the size-scaling of metabolism is widespread in nature, and the factors driving that remain unknown. Here we test a hypothesis that the increased expenditure associated with faster growth increases metabolic scaling. We compare metabolic scaling in the fast-and slow-growth phases of ontogeny of Helix aspersa snails artificially selected or not selected for increased adult size. The selected line evolved larger egg and adult sizes and a faster sizespecific growth rate, without a change in the developmental rate. Both lines had comparable food consumption but the selected snails grew more efficiently and had lower metabolism early in ontogeny. Attainment of lower metabolism was accompanied by decreased shell production, indicating that the increased growth was fuelled partly at the expense of shell production. As predicted, the scaling of oxygen consumption with body mass was isometric or nearly isometric in the fast-growing (early) ontogenetic stage, and it became negatively allometric in the slow-growing (late) stage; metabolic scaling tended to be steeper in selected (fast-growing) than in control (slow-growing) snails; this difference disappeared later in ontogeny. Differences in metabolic scaling were not related to shifts in the scaling of metabolically inert shell. Our results support the view that changes in metabolic scaling through ontogeny and the variability of metabolic scaling between organisms can be affected by differential growth rates. We stress that future approaches to this phenomenon should consider the metabolic effects of cell size changes which underlie shifts in the growth pattern.

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Section: Linking Metabolic Scaling Growth and Cell Size -Future Prosmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scaling of metabolism inHelix aspersasnails: changes through ontogeny and response to selection for increased size

Czarnołęski

Kozłowski

Dumiot

et al. 2008

Journal of Experimental Biology

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“…Although interesting, this idea has not been worked out sufficiently to allow quantitative predictions of speciesbody size distributions. Fourth, Koziowski and Weiner (1997), backed up by Kindlmann et al (1999), predict an optimal body size based on a trade-off between production and mortality, and they show that for different, lognormally distributed model parameters, the distribution of optimal body sizes is right-skewed in most cases. Again, a more than verbal argument is lacking of how such a distribution will yield the unimodal pattern observed in an ecological community.…”

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confidence: 99%

How Dispersal Limitation Shapes Species–Body Size Distributions in Local Communities

Etienne

Olff

2004

The American Naturalist

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A critical but poorly understood pattern in macroecology is the often unimodal species-body size distribution (also known as body size-diversity relationship) in a local community (embedded in a much larger regional species pool). Purely neutral community models that assume functional equivalence among species are incapable of explaining this pattern because body size is the key determinant of functional differences between species. Several nichebased explanations have been offered, but none of them is completely satisfactory. Here we develop a simple model that unites a neutral community model with niche-based theory to explain the relationship. In the model, species of similar size are assumed to belong to the same size guild. Within a size guild, all individuals are equivalent in their competition for resources, sensu Hubbell's neutral community model; they have the same speciation rate and dispersal capacities. Between size guilds, however, the total number of individuals, the speciation rate, and the dispersal capacities differ, but using known allometric scaling laws for these properties, we can describe the differences between size guilds. Our model predicts that species richness reaches an optimum at an intermediate body size, in agreement with observations. The optimum at intermediate body size is basically the result of a trade-off between, on the one hand, allometric scaling laws for the number of individuals and the speciation rate that decrease with body size and, on the other hand, the scaling law for active dispersal that increases with body size.

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“…The lognormal SWD is also one of the best documented macroecological patterns (Loder 1997;Gaston & Blackburn 2000;Kozłowski & Gawelczyk 2002;. However, there are still several different models that aim at explaining the pattern (McKinney 1990;Maurer et al 1992;Brown et al 1993;Kozłowski & Weiner 1997;Kindlmann et al 1999;.…”

Section: Discussionmentioning

confidence: 99%

Body size and the relative abundance of species

Ulrich

2008

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Abstract. Existing models of species abundance distributions (SADs) can be divided into those that are based on concepts of common limited niche space (niche apportionment models, neutral models) and those that invoke standard statistical distributions (e. g. log-series, lognormal). While the first type of models assumes that competitive interactions lead to observed SADs, the models of the second type appear to be mainly statistical descriptors of SADs without deeper biological meaning. None of the models explicitly includes species body size as a factor influencing species abundances. Further, with the exception of recent neutral models they are not embedded into basic ecological and evolutionary models to explain local diversity and ecosystem functioning. Here I present a new random walk model of species abundances that is based on two well known ecological distributions, the abundance -body weight distribution and the species -body weight distribution to define long-term upper abundance boundaries (carrying capacities). I show that a simple random walk of species abundances around the carrying capacities not only generates observed SADs but is also able to explain other patterns of community structure like core -satellite distributions, temporal patterns of species turnover, variance -mean ratios, and biomass distributions.

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Does Body Size Optimization Result in Skewed Body Size Distribution on a Logarithmic Scale?

Cited by 14 publications

References 0 publications

Scaling of metabolism inHelix aspersasnails: changes through ontogeny and response to selection for increased size

Scaling of metabolism inHelix aspersasnails: changes through ontogeny and response to selection for increased size

How Dispersal Limitation Shapes Species–Body Size Distributions in Local Communities

Body size and the relative abundance of species

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