Search results for "Anodonta"
showing 5 items of 25 documents
Influence of trematode parasitism on the growth of a bivalve host in the field.
1998
Abstract Trematode-induced gigantism of molluscs, enhanced growth of trematode-parasitised individuals, has been observed in many laboratory studies. This study reports the effect of the sterilising trematode, Rhipidicotyle fennica , on the growth of the freshwater clam Anodonta piscinalis under field conditions. In addition to single infections (prevalence 44%), a few clams (3%) were infected with both R. fennica and Rhipidocotyle campanula . Parasite-induced gigantism was not found; parasites lowered host growth. The decrease in growth was correlated with the quantity of parasite material. Clams with double infections grew the least, although they did not differ significantly from hosts w…
Morphological and molecular analysis of the freshwater bivalve Anodonta anatina in Iran and Finland
2022
Duck mussel, Anodonta anatina is a habitat generalist inhabiting both lentic and lotic aquatic ecosystems. Due to high morphological similarity and phenotypic plasticity, A. anatina has sometimes been misidentified as A. cygnea. Here, morphological and molecular studies were conducted on Anodonta mussels inhabiting North Iran and Finland. The individuals were collected from Anzali Wetland, Tajan River (North Iran) and Jyväsjärvi Lake (Finland). The COI sequence analysis showed the existence of A. anatina in the sampling areas. The Iranian and Finland specimens showed three and two haplotypes, respectively. The Iranian haplotypes were placed in a single clade, while the Finland haplotypes we…
Concentrations of metallothionein in the bivalve molluscsAnodonta spp.andUnio spp.from Latvian lakes with different anthropogenic pressure
2013
Concentrations of metallothioneins (MT) were analysed in bivalve molluscs Anodonta spp. and Unio spp. from 6 lakes and watercourses of Latvia with different anthropogenic pressure. The aim of the study was to find the relationship between MT in molluscs and concentrations of heavy metals in sediments. Unio spp. and Anodonta spp. showed no significant differences in the concentrations of MT. High concentrations of heavy metals (Cd, Pb, Hg, Cu, Zn) were detected in the deepest parts of polluted water bodies, however their concentrations significantly decreased in near shore sediments inhabited by molluscs. Only Zn tends to accumulate in the molluscs, reaching 2-7 times higher concentrations i…
Morphological variation of the unionidae mussel Anodonta anatina
2013
ABSTRACT Morphology of a given species can vary among individuals, morphology differences can be found between populations males can be different from females (sexual dimorphism) or e.g. with young and old individuals. The aim of the present study was to investigate morphological variability in the unionidae mussel Anodonta anatina originating from two populations. Measured variables included length, height, width, volume and dry mass of shell, dry mass of soft tissues and gill blades, and age, sex, estimation of glochidium larvae produced. The main results included faster growth of mussels in Lake Koijärvi than in Lake Päijänne (at the age of 4-5 years), which may reflect the higher produc…
Shell morphology of the unionid mussels (Anodonta anatina, Unio pictorum and U. tumidus) in relation to gender and trematode parasitism
2015
Freshwater mussels (Unionoida) show great variability in shell morphology which can be associated with differences in habitat, sex and/or parasite infection. Three unionid mussel species, (Anodonta anatina, Unio pictorum and Unio tumidus) were collected from two sites Lake Saravesi, (Laukaa) and Lake Kuivasjarvi, (Oulu), between May - October 2012. Intraspecific trends that were associated with the mussels’ sex and/or parasites infection were studied and observations were made on how sex and parasite infection could have a role in shells morphological characters/patterns. The study revealed a range of morphometric differences among and across populations, as well as, within and between spec…