Morphological variation in Echinorhynchus truttae Schrank, 1788 and the E. bothniensis Zdzitowiecki & Valtonen, 1987 species complex from freshwater fishes of northern Europe

Observed and fitted distributions of Echinorhychus truttae in two populations of its definitive host Salmo trutta. Analysis based on data in Suppl. materials 6, 7

Loch Walton Burn. Negative binomial distribution has parameters: mu=0.565 and k=0.375. Poisson distribution has parameter lambda=0.565. AIC for fitted distributions: negative binomial, 97.5; Poission, 107.3.