Temporal Variation in Prevalence and Abundance of Metacercariae in the Pulmonate Snail Lymnaea Stagnalis in Chany Lake, West Siberia, Russia: Long-Term Patterns and Environmental Covariates

Abstract

Infrapopulations of trematode metacercariae were monitored in the snail Lymnaea stagnalis over 17 yr (1982-1999) at Chany Lake, Novosibirskaya Oblast', Russia. Eighteen trematode species were recorded. Patterns of occurrence varied from 4 species (Echinoparyphium aconiatum, Echinoparyphium recurvatum, Moliniella anceps, and Cotylurus cornutus) that persisted at relatively high prevalence (> 60% of samples) across sites, seasons, and years, to species that were very rare and sporadic in occurrence. The stability of the 4 common species was probably because of their occurrence either in a wide range of definitive hosts or in a host adapted to the extreme abiotic changes that occurred from year to year in these wetlands. The prevalence and mean abundance of C. cornutus were negatively correlated with water level in the wetlands; its prevalence was also correlated with water temperature. The mean abundance of M. anceps was positively correlated with water level. The most probable explanation for the cyclic dynamics of infections of the common species is change in population sizes and densities of definitive and intermediate hosts, which mediated cyclic alterations in water levels.

Foodborne Intestinal Flukes in Southeast Asia

“…The planorbid snails, including Physa alexandrina, Physa fontinalis, Planorbis planorbis, Lymnaea pervia, Lymnaea peregra, Valvata piscinalis, and Radix auricularia coreana shed the cercariae [78][79][80], and the metacercariae encyst in tadpoles and frogs of Rana temporaria and also in snails, P. planorbis, Lymnaea sp. [6], R. auricularia coreana [80], and Lymnaea stagnalis [81]. House rats [75], wild rats (Arvicanthis niloticus) [82], and species of birds are natural definitive hosts [48].…”

Larval trematodes in bithyniid snails (Gastropoda: Bithyniidae) in the lake-rivers systems from the steppe zone (The West Siberian Plain, Russia)

“…The most prevalent metacercariae were those of E. aconiatum and E. recurvatum (both family Echinostomatidae) and C. bithyniae (Cyathocotylidae). In previous studies Yurlova et al (2006), and Serbina, (2014) showed that, metacercariae of E. aconiatum, were recorded in more than 70 % of samples of Lymnaea stagnalis and samples of B. troscheli in Chany Lake (South-West Siberia, Russia).…”

Invertebrate grazers affect metal/metalloid fixation during litter decomposition

“…Snail density was looked for to be in a natural range (Yurlova et al, 2006). For acclimation to the experimental conditions, the individuals of L. stagnalis were precultured for 5 d in the laboratory (in 10 L of soft water, 20°C) before starting the experiment.…”