title: Small effective population sizes in two planktonic freshwater copepod species (Eudiaptomus) with apparently large census sizes.
abstract: In small planktonic organisms, large census sizes (N(c)) suggest large effective population sizes (N(e)), but reliable estimates are rare. Here, we present N(e)/N(c) ratios for two freshwater copepod species (Eudiaptomus sp.) using temporal samples of multilocus microsatellite genotypes and a pseudo-likelihood approach. N(e)/N(c) ratios were very small in both Eudiaptomus species (10(-7)-10(-8)). Although we hypothesized that the species producing resting eggs (E. graciloides) had a larger N(e) than the other (E. gracilis), estimates were not statistically different (E. graciloides: N(e) = 672.7, CI: 276-1949; E. gracilis: N(e) = 1027.4, CI: 449-2495), suggesting that the propagule bank of E. graciloides had no detectable influence on N(e).
authors: Max-Planck Institute for Limnology, Plön, Germany. mzeller72@aol.com
authors: M
authors: M
authors: Zeller
authors: T B H
authors: TB
authors: Reusch
authors: W
authors: W
authors: Lampert
mesh_terms: D025041:Animal Migration; D000818:Animals; D033342:Copepoda / Q000235:genetics / Q000502:physiology*; D017753:Ecosystem; D005260:Female; D005618:Fresh Water; D014644:Genetic Variation; D005838:Genotype; D005858:Germany; D018895:Microsatellite Repeats / Q000235:genetics; D011156:Population Density; D013997:Time Factors; D015048:Zooplankton / Q000235:genetics / Q000502:physiology*