SEASONAL VARIATION OF ATTACHMENT APPARATUS AND COPULATORY ORGAN MORPHOMETRIC VARIABLES OF DACTYLOGYRUS CRUCIFER WAGENER, 1857 (MONOGENEA: DACTYLOGYRIDAE) ON THE GILLS OF ROACH (RUTILUS RUTILUS L.) IN LATVIAN WATER BODIES

There are many abiotic factors, such as oxygen, salinity, pH etc. that inpact to phenotypic plasticity of parasitic organisms. In the present studies, we are focused on seasonal variation in morphometry of monogenea from Dactylogyrus genus. Seasonal variation in measurments of attachment apparatus and copulatory organ of Dactylogyrus crucifer Wagener, 1857 were studied on museum colection material from 1956 and the period from 1984 to 1998. The main results indicate that difference between winter and spring conditions basically cause significant (p<0.05) changes in morphometrical variables of measurements of anchors, dorsal connective bar and copulatory organ.

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