Dactylogyrus (Monogenea) communities on the gills of roach in three lakes in Central Finland

Abstract

SUMMARYDactylogyrus (Monogenea) species were studied on the gills of roach (Rutilus rutilus) from a total of 293 fish in 3 interconnected lakes in Central Finland. One of the lakes is eutrophic and polluted by a paper and pulp mill, one is eutrophic and one is oligotrophic. Nine Dactylogyrus species were found. The structure of the monogenean communities was analysed at the component and infracommunity level and the Dactylogyrus fauna of the lakes was compared. Although it was found that the component communities tended to be very similar there were also differences. The abundance and diversity were highest in the polluted lake; the infracommunities of this lake were considerably more often dominated by Dactylogyrus micracanthus and the similarities between the infracommunities were higher within the lakes than between the lakes. It is suggested that these differences are due to the differing water quality of the lakes. The nature of the monogenean community, its possible interactivity, is also discussed.

Distribution of gill Monogenean parasites from Oreochromis niloticus (Linn, 1758) in man-made Lake Ayam I, Cte dIvoire

“…For Buchmann (1989) and , the median preference arches may also be related to the large colonized surfaces they offer to parasites. Other factors such as parasite load (Lo and Morand, 2000) and the host immunity can also influence microhabitat selection (Koskivaara and Valtonen, 1992;Gutiérrez and Martorelli, 1994).…”

Macroparasite Community and Asymmetry of the Yellow Eel Anguilla Anguilla in Salses-Leucate Lagoon, Southern France

“…Parasites have been found to be associated with a deviance of symmetry in the development (MØLLER, 1992;POLAK, 1993;REIMCHEN, 1997, THOMAS et al, 1998, BROWN and BROWN, 2002but see also CLARKE, 1998and PALMER, 1999. This may be explained by (i) a direct stress caused by the metabolic cost of the parasite on its host (MØLLER, 1992;POLAK, 1993), (ii) a variation of the abundance of the parasite related to more or less stressful environmental conditions for hosts (KOSKIVAARA and VALTONEN, 1992), (iii) a relationship between the genetic incapacity to interfere with developmental errors and the susceptibility to parasite (MØLLER, 1996). Several studies have tested a relationship between FA and parasitism.…”

Lead content of Paratenuisentis ambiguus (Acanthocephala), Anguillicola crassus (Nematodes) and their host Anguilla Anguilla

“…Moller 1987, Khan & Thulin 1991, Koskivaara & Valtonen 1992, Sures et al 1994a dealing with the interrelation between pollution and fish parasites, but there are just a few comparative, quantitative investigations about the heavy metal content of fish parasites and their hosts. Sures et al (1994a, b) reported very high lead concentrations in 2 species of palaeacanthocephalans.…”