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Body Size, Food Concentration, and Population Growth in Planktonic Rotifers
Population growth rates of eight species of planktonic rotifers were assessed for five to seven food concentrations using daily renewed batch cultures. The food concentration for which populationExpand
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A General Approach to the Culture of Planktonic Rotifers
A general method for establishing cultures of planktonic rotifers from natural waters is described. Algal isolates are tested for their suitability as food for rotifers collected from the same sourceExpand
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Prey selection by the copepod Diacyclops thomasi
Summary1.Adult females of the predaceous copepod, Diacyclops thomasi, consistently selected for the soft-bodied rotifers Synchaeta pectinata, Polyarthra major and P. remata when presented variousExpand
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Spine development in the rotifer Keratella cochlearis: induction by cyclopoid copepods and Asplanchna
SUMMARY. 1. Spine development in a clone of unspined Keratella cochlearis was promoted by a water soluble factor released by the copepods Tropocyclops prasinus and Mesocyclops edax and by theExpand
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Reproductive costs and hydrodynamic benefits of chemically induced defenses in Keratella testudo
Food concentration differentially affected reproductive rates and hydrodynamic characteristics of spincd and unspined phenotypes of the polymorphic rotifer Kerutella testudo. The intrinsic rate ofExpand
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Rotifer Threshold Food Concentrations and the Size-Efficiency Hypothesis
Using published data, we develop a physiological explanation for the positive relationship between threshold food concentration (the food concentration at which the population growth rate is zero)Expand
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Asplanchna-induced polymorphism in the rotifer Keratella slacki1
Asplanchna releases into its environment a filterable factor which induces eggs of Keratella slacki to develop into individuals with slightly larger (x 15%) bodies, considerably longer (a 30%)Expand
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Multiple‐Species Induction of Morphological Defenses in the Rotifer Keratella Testudo
Filtrates of cultures of 10 of 12 common freshwater zooplankton species induced posterior spines in the rotifer Keratella testudo. Filtrates of cultures of Asplanchna spp. and those of crustaceanExpand
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Body size, ration level, and population growth in Asplanchna
Abstract1.)The daily ration required to maintain a population growth rate, rm, of zero (threshold ration) increased with increasing Asplanchna body mass. This relationship is described by theExpand
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