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Juvenile growth rate as a measure of fitness in Daphnia

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons56790

Lampert,  W.
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons56975

Trubetskova,  I.
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Zitation

Lampert, W., & Trubetskova, I. (1996). Juvenile growth rate as a measure of fitness in Daphnia. Functional Eology, 10(5), 631-635.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-E2A7-A
Zusammenfassung
1. An empirical relationship is established between the somatic juvenile growth rate (g) and the instantaneous rate of increase (r) in Daphnia magna in order to test if g can be used as a measure of fitness. Tested variables influencing g include food concentration, temperature, clonal differences and maternal effects. 2. The juvenile growth rate g was calculated for fixed time periods of 2 to 6 days (g(f)) or for the 'physiological' juvenile period to the deposition of the first clutch (g(j)), which varied with environmental conditions. Both g(f)and g(j) resulted in linear relationships between g and r when food concentration was the only variable. If the other variables were included then only g(j) resulted in a good fit. 3. Although the relationship may be slightly curvilinear, g(j) is a robust predictor of r. The ratio r: g(j) is not affected by juvenile size and size at maturation. Hence g(j), can be used as a relative measure of fitness in Daphnia. This can save considerable time and effort when determining reaction norms in life-table experiments with many genotypes