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Full-Text Articles in Biology
The Bertalanffy Growth Equation: Theory Of Paulys Auximetric Plots, Eric L. Charnov
The Bertalanffy Growth Equation: Theory Of Paulys Auximetric Plots, Eric L. Charnov
Biology Faculty & Staff Publications
No abstract provided.
Size And Temperature In The Evolution Of Fish Life Histories, Eric Charnov, James Gillooly
Size And Temperature In The Evolution Of Fish Life Histories, Eric Charnov, James Gillooly
Biology Faculty & Staff Publications
Body size and temperature are the two most important variables affecting nearly all biological rates and times, especially individual growth or production rates. By favoring an optimal maturation age and reproductive allocation, natural selection links individual growth to the mortality schedule. A recent model for evolution of life histories for species with indeterminate growth, which includes most fish, successfully predicts the numeric values of two key dimensionless numbers and the allometry of the average reproductive allocation versus maturation size across species. Here we use this new model to predict the relationships of age-at-maturity, adult mortality and reproductive effort to environmental …
Thermal Time: Body Size, Food Quality And The 10c Rule, Eric Charnov, James Gillooly
Thermal Time: Body Size, Food Quality And The 10c Rule, Eric Charnov, James Gillooly
Biology Faculty & Staff Publications
Developmental rates of ectotherms (y) are often linearly related to temperature (Tc in C) within some biologically relevant range of temperatures as y = (1/S)(Tc - Tb), where Tb is the estimated temperature at zero development, and the thermal constant S is the development time multiplied by the temperature above Tb (i.e. degree days above Tb). Among similar species, it has been widely shown that S and Tb are negatively related across environments, that S is positively related to body size, and that Tb is independent of body size but increases with mean environmental temperature. Here we present a model …
Effects Of Size And Temperature On Developmental Time, James Gillooly, Eric Charnov, Geoffrey West, Van Savage, James Brown
Effects Of Size And Temperature On Developmental Time, James Gillooly, Eric Charnov, Geoffrey West, Van Savage, James Brown
Biology Faculty & Staff Publications
Body size and temperature are the two most important variables affecting nearly all biological rates and times. The relationship of size and temperature to development is of particular interest, because during ontogeny size changes and temperature often varies. Here we derive a general model, based on first principles of allometry and biochemical kinetics, that predicts the time of ontogenetic development as a function of body mass and temperature. The model fits embryonic development times spanning a wide range of egg sizes and incubation temperatures for birds and aquatic ectotherms (fish, amphibians, aquatic insects and zooplankton). The model also describes nearly …
Effects Of Size And Temperature On Metabolic Rate, James Gillooly, James Brown, Geoffrey West, Van Savage, Eric Charnov
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.