cytogenetic and sequence comparison of adult phyllodistomum (digenea: gorgoderidae) from the three-spined stickleback with larvae from two bivalves.due to the low informative value of available morphological characters, cytogenetic and molecular methods, based on rdna sequencing, were used to characterize adult and larval stages of phyllodistomum spp. species studied have 18 chromosomes with comparable absolute and relative lengths. conventional giemsa staining and karyometric analysis revealed clear differences in chromosome morphology of larval phyllodistomum spp. infecting two bivalve host species, sphaerium corneum and pisidium amnicum. ...200415648700
digenean parasites of the bivalve mollusc pisidium amnicum in a small river in eastern finland.the host-parasite relationship between digeneans and a semelparous population of the mollusc. pisidium amnicum müller in a small river in eastern finland was studied during 1992/1993. the parasite prevalence of the population was high. the total prevalence was 45.6% in 1992 (n = 790) and 47.5% in 1993 (n = 160). the dominant digenean, bunodera luciopercae (34.2% in 1992, 35.0% in 1993), had highest prevalences in july/august and in winter. two other species, palaeorchis crassus (7.8% in 1992, 7. ...19989745717
toxicokinetics of 2,4,5-trichlorophenol and benzo(a)pyrene in the clam pisidium amnicum: effects of seasonal temperatures and trematode parasites.several biotic and abiotic stress factors may affect aquatic organisms simultaneously. however, not much is known about the effects of, e.g., low temperatures and parasite infections on the toxicokinetics of organic hydrophobic chemicals. here we studied the accumulation and depuration of [(14)c]2,4,5-trichlorophenol (tcp) and [(3)h]benzo(a)pyrene (bap) in the sediment-dwelling freshwater clam pisidium amnicum. experiments were made in october (+15 degrees c), april (+4 degrees c), and july (+15 ...200010948286
morphology, development and probable systematic position of cercariaeum crassum wesenberg-lund, 1934 (digenea), a parasite of pisidium amnicum in eastern finland.cercariaeum crassum wesenberg-lund, 1934 is redescribed at the cercariaeum stage and the daughter-rediae and cercaria are also described on the basis of new material from pisidium amnicum collected in the liikasepuro river (eastern finland). the species is allocated to the family allocreadiidae, although its generic affiliation remains unknown. the probable life-cycle (based on the developmental stages observed in daughter-redia) appears to eliminate the cercarial stage and, instead, a cercariae ...200717912620
 the filtration rates of four species of eulamellibranchs (dreissena polymorpha, sphaerium corneum, pisidium amnicum and pisidium casertanum) are measured at high (14°, 15° respectively 20°c) and low (5° respectively 6°c) temperatures by an indirect method. the differences of filtration rates at high and low temperatures are significant in all classes of size. the filtration efficiency of large individuals is more dependent on temperature than that of small ones. the filtration rate "ml/g live we ...197228307204
clarification of the systematic position of cercariaeum crassum wesenberg-lund, 1934 (digenea), based on karyological analysis and dna sequences.chromosome set and rdna sequences of the larval digenean cercariaeum crassum were analysed in order to clarify its systematic position and possible adult form. parasites were obtained from the sphaeriid bivalve pisidium amnicum, collected in lithuanian and finnish rivers. the karyotype is shown to consist of five pairs (2n = 10) of large, up to 14 µm, chromosomes. complement, composed of a low diploid number of exclusively bi-armed elements, presumably arose through robertsonian fusions of acroc ...201121791154
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