Figure 1

Population growth rates, fecundity and probability of survival of six strains of the two rotifer species Brachionus calyciflorus s.s. (‘IGB, ‘USA’, ‘Cornell’) and Brachionus fernandoi (‘No. 2484’, ‘Lietzensee’, ‘Mittelsee’) feeding on one of the three unicellular algae species Nannochloropsis limnetica, Monoraphidium minutum and Synechococcus elongatus. Each food alga was supplied in two quantities (0.4 and 1.6 mg C L⁻¹). Values represent means ± standard deviation. For strains, the number of replicates was usually N = 4 with five exceptions in the population growth rates with N = 3 (IGB and Cornell fed 1.6 mg C L⁻¹ M. minutum; No. 2484, Lietzensee, and Mittelsee fed 0.4 mg C L⁻¹ S. elongatus). For species, all replicates of the respective strains were included for the calculation, resulting in N = 72 for fecundity and survival and N = 70 and N = 69 for population growth rates of B. calyciflorus s.s. and B. fernandoi, respectively.