ISSN:
1573-5117
Keywords:
food concentration
;
life history
;
Ceriodaphniacf. dubia
;
reproduction
;
longevity
;
population growth rate
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The effect of five different food concentrations on the life history of Ceriodaphnia cf. dubia was examined by following cohorts of 25 individuals from 〈24 hours until the death of all individuals. The food concentrations used in the study were chosen to reflect densities found in lentic freshwater systems and those commonly used in toxicity testing, and ranged from 1 × 104 cells mL-1 to 15 × 104 cells mL-1. Food concentration was found to have a significant effect (p〈0.05) on several life history parameters, with a decrease in food concentration leading to a decrease in brood sizes and population growth rate, and an increase in longevity. Population growth rates varied from approximately 0.39 neonates d-1 to 0.54 neonates d-1, while mean lifespan ranged from 16.7 days to 42.9 days. A decrease in food concentration also led to an increase in the mean generation time.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1003952013164
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