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Heredity , 84 Oxford University Press is a department of the University of Oxford. It furthers the University's objective of excellence in research, scholarship, and education by publishing worldwide. Sign In or Create an Account. Sign In. Advanced Search. Search Menu. Article Navigation. Close mobile search navigation Article Navigation. Volume Article Contents Abstract.
Oxford Academic. Google Scholar. Todd D. Michael W. Cite Cite Michael J. Select Format Select format. Permissions Icon Permissions. Abstract The majority of ectotherms grow slower but mature at a larger body size in colder environments. Thermal constraints on maximal body size have been explored using Bertalanffy's growth function Bertalanffy, , in which growth rate is the difference between rates of anabolism and catabolism:.
Open in new tab. Open in new tab Download slide. Assume an organism in an aseasonal environment whose relative fitness is indexed by the net reproductive rate R 0 , which is defined as follows:. The optimal strategy under these conditions is to allocate entirely to growth at early ages and allocate entirely to reproduction after maturation Perrin and Sibly, Given that no energy is optimally allocated to growth following maturation, equation A1 becomes. When c is greater than d , the optimal decision is to grow indefinitely Sevenster, When c and d are both equal to 1.
When c and d are equal, but less than 1. The optimal body size and the Q 10 for optimal body size cannot easily be solved for the general condition in which d is greater than c. However, under the special case when d is 1. Van Voorhies. Issue Section:. Download all slides. View Metrics. Email alerts Article activity alert. Advance article alerts. New issue alert. Receive exclusive offers and updates from Oxford Academic. The same is true among ectotherms, though we can 't compare between the groups.
Here are 10 easy ways to increase your metabolism. Eat Plenty of Protein at Every Meal. Eating food can increase your metabolism for a few hours. Drink More Cold Water. Do a High-Intensity Workout. Lift Heavy Things. Stand up More. Drink Green Tea or Oolong Tea. Eat Spicy Foods. Get a Good Night's Sleep. Metabolism is the biochemical process of combining nutrients with oxygen to release the energy your our bodies need to function. Your resting metabolic rate RMR is the number of calories your body burns to maintain vital body functions such as heart rate , brain function and breathing.
Basal Metabolic Rate BMR calculations use a person's age, height, weight and gender to find the number of calories burned in a day. Do strength training exercises to build muscle and burn more calories even when your body is resting. Eat the right number of calories. But eating too few calories can cause your metabolism to slow down. Make sure you're eating enough calories to maintain a healthy metabolism.
Metabolic rate is the rate of metabolism , the amount of energy used by an animal per unit of time. Heat is emitted from organisms as a byproduct of this process. Since ectothermic animals cannot regulate their own body temperatures, their metabolism is affected by the external temperature. Metabolism has two metabolic pathways. The first is the catabolic pathway, which breaks down complex compounds, such as glucose and proteins, into simple compounds. This makes energy available for the working of the cell.
The second pathway is the anabolic pathway, which builds complex compounds needed by the body, such as protein for muscle, from these simple compounds. Because chemical reactions are unpredictable -- they may not produce the right compounds, or the required amount -- cells need enzymes to regulate metabolic activity.
Enzymes bring the right chemicals together and speed up chemical reactions. Enzymes are therefore catalysts of chemical reactions.
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