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Acta Parasitologica, Vol.43, No. 2, 1998, 81-85

(1) Department of Application of Mathematics, Mathematical Institute, University of Wroclaw, Pl. Grunwaldzki 2/4, 50-384 Wroclaw; (2) Department of General Parasitology, Microbiological Institute, University of Wroclaw, Przybyszewskiego 63/77, 51-138 Wroclaw; Poland

ABSTRACT

The frequency distributions of seven lice species: *Amyrsidea perdicis megalosoma* (Overgaard, 1943), *Uchida phasiani* Modrzejewska et Zlotorzycka, 1977 (suborder Amblycera), *Goniocotes chrysocephalus* Giebel, 1874,
*Zlotorzyckella colchici* (Denny, 1842), *Lipeurus maculosus maculosus* Clay, 1938, *Reticulipeurus mesopelios colchicus* (Clay, 1938)
and *Lagopoecus colchicus* Emerson, 1949 (suborder Ischnocera) parasitizing the pheasant (*Phasianus colchicus* L.) were characterized with various statistical parameters (mean, range, prevalence and standard deviation) together with three indic
es of parasite aggregation:
parameter alpha of the negative binomial distribution, coefficient of dispersion (c.d.) as a dispersion to mean ratio (or s/x) and index of discrepancy (D of Poulin's index).
A complex set of measures of aggregations confirmed the aggregated distributions of all parasite species; in all the series analysed the bird lice distributions fit the negative binomial model.
Two parameters alpha and D of Poulin were correlated, i.e. high values of
alpha were associated with low values of D.