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Series

2001

University of New Mexico

Articles 1 - 7 of 7

Full-Text Articles in Life Sciences

Effects Of Size And Temperature On Metabolic Rate, James Gillooly, James Brown, Geoffrey West, Van Savage, Eric Charnov Sep 2001

Effects Of Size And Temperature On Metabolic Rate, James Gillooly, James Brown, Geoffrey West, Van Savage, Eric Charnov

Biology Faculty & Staff Publications

We derive a general model, based on principles of biochemical kinetics and allometry, that characterizes the effects of temperature and body mass on metabolic rate. The model fits metabolic rates of microbes, ectotherms, endotherms (including those in hibernation), and plants in temperatures ranging from 0 to 40C. Mass - and temperature - compensated resting metabolic rates of all organisms are similar: The lowest (for unicellular organisms and plants) is separated from the highest (for endothermic vertebrates) by a factor of about 20. Temperature and body size are primary determinants of biological time and ecological roles.

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Reproductive Constraints And The Evolution Of Life Histories With Indeterminate Growth, Eric Charnov, Thomas Turner, Kirk Winemiller Jul 2001

Reproductive Constraints And The Evolution Of Life Histories With Indeterminate Growth, Eric Charnov, Thomas Turner, Kirk Winemiller

Biology Faculty & Staff Publications

This article develops a new evolutionary model for life histories by combining a new production-growth model with some general, yet specific, constraints on reproductive allocation, and by allowing natural selection to adjust the age of first breeding and the metabolic/productive capacity of cells. The optimal life histories correctly predict the numeric value of dimensionless numbers that combine maturation age (size), mortality, and reproductive allocation. The life-history prediction also yields a new lifetime growth model for body mass under indeterminate growth and predicts that the fastest growth rate will be near the size at first reproduction. Table 1 is a glossary …

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Reproductive Efficiencies In The Evolution Of Life Histories, Eric Charnov Jan 2001

Reproductive Efficiencies In The Evolution Of Life Histories, Eric Charnov

Biology Faculty & Staff Publications

Darwinian fitness is expressed as the product of 2 cost/benefit ratios.

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Evolution Of Mammal Life Histories, Eric Charnov Jan 2001

Evolution Of Mammal Life Histories, Eric Charnov

Biology Faculty & Staff Publications

If we assume that adult life span and age-at-maturity are described correctly by quarter power allometries across (typical) mammal species, we are tempted to look for some fundamental explanation. The explanation must acknowledge that within-species growth is sigmoid and not a power function at all, and that natural selection probably sets the age at maturity in the face of externally imposed mortality, while also allowing some mortality adjustment due to internal factors. This paper develops hypotheses to account for the above scaling rules and it predicts the numeric values of several new dimensionless numbers that interrelate growth, mortality and investment …

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Density-Dependent Invariance, Dimensionless Life Histories, And The Energy-Equivalence Rule, Eric Charnov, John Haskell, S.K.M. Ernest Jan 2001

Density-Dependent Invariance, Dimensionless Life Histories, And The Energy-Equivalence Rule, Eric Charnov, John Haskell, S.K.M. Ernest

Biology Faculty & Staff Publications

Damuth's energy equivalence rule for mammals is studied in a population dynamic framework.

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Fitness Trade-Offs Select For Semelparous Reproduction In An Extreme Environment, Felisa Smith, Eric Charnov Jan 2001

Fitness Trade-Offs Select For Semelparous Reproduction In An Extreme Environment, Felisa Smith, Eric Charnov

Biology Faculty & Staff Publications

No abstract provided.

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Rationale For A Focus On Biomphalaria Glabrata, Coen M. Adema, Eric S. Loker, Fred Lewis, Matty Knight Jan 2001

Rationale For A Focus On Biomphalaria Glabrata, Coen M. Adema, Eric S. Loker, Fred Lewis, Matty Knight

Biomphalaria Genome Initiative

No abstract provided.

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