Effect of temperature on growth, reproduction and survival of the freshwater planorbid snail, Gyraulus convexiusculus, vector of echinostomiasis

Parashar, B. D.; Rao, K. M.

doi:10.1007/bf00008458

Cited by 10 publications

(3 citation statements)

References 11 publications

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“…the number of embryos or eggs) also depends on ambient temperature (Parashar & Rao, 1988;van der Schalie & Berry, 1973), with an increase in reproduction under the influence of elevated water temperature (Sankurathri & Holmes, 1976). the number of embryos or eggs) also depends on ambient temperature (Parashar & Rao, 1988;van der Schalie & Berry, 1973), with an increase in reproduction under the influence of elevated water temperature (Sankurathri & Holmes, 1976).…”

Section: Discussionmentioning

confidence: 99%

“…It is generally recognised that the reproductive output of snails (i.e. the number of embryos or eggs) also depends on ambient temperature (Parashar & Rao, 1988;van der Schalie & Berry, 1973), with an increase in reproduction under the influence of elevated water temperature (Sankurathri & Holmes, 1976). This is consistent with our results and indicates that the TPL under study generates favourable thermal conditions for snails iteroparity, a strategy of multiple reproductive episodes before death (Dillon, 2000), the more that the sex ratio of viviparid hosts in both lakes was comparable.…”

Section: Discussionmentioning

confidence: 99%

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Different thermal conditions of lakes affect host–parasite systems: A case study of Viviparus contectus (Millet, 1813) and digenean trematodes

et al. 2019

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Thermal disturbance of aquatic ecosystems directly and/or indirectly affects interspecific interactions, including parasitism. Both hosts and parasites respond differently to environmental changes, thus, predicting how host–parasite systems behave under the influence of disturbance remains a challenge. The aim of the study was to check how the differences in thermal conditions of lakes affect life‐history traits of hosts and the level of parasitism, using a Viviparus contectus–digenean trematodes model. Overall, we examined 480 individuals of V. contectus collected from a thermally polluted lake (TPL) and a natural lake (NL). Host features, including body size and fecundity, as well as the prevalence and species richness of digenean trematodes in snail populations were investigated. We found that V. contectus from the TPL were significantly larger, heavier, and females were more fertile than snails collected from the NL. A total of 20.4% of the collected snails were infected with digenean larvae. The species richness of parasites was twice as high in the NL compared to the TPL (six and three species, respectively). A significant difference in the percentage of snails infected with parasites was identified between both types of lakes, with a higher prevalence of V. contectus in the NL (31.3%) compared to the TPL (7.3%). These results indicate that host–parasite systems follow the environmental changes in lakes due to thermal pollution by increasing fertility and metabolism rate of viviparid hosts and by decreasing the prevalence and diversity of digenean trematodes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Different thermal conditions of lakes affect host–parasite systems: A case study of Viviparus contectus (Millet, 1813) and digenean trematodes

et al. 2019

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“…Gyraulus chinensis is a dominant species in the middle reaches of the stream. Congeneric species are widely distributed in streams and freshwater ponds in Asia, America and Europe (Dussart, 1979; Parashar & Rao, 1988; Habe, 1990). The snails have an adult shell diameter of c. 5 mm (Habe, 1990), a lifespan of about 6 months, and they breed in spring and autumn (Dussart, 1979).…”

Section: Methodsmentioning

confidence: 99%

Light intensity regulates growth and reproduction of a snail grazer (Gyraulus chinensis) through changes in the quality and biomass of stream periphyton

Ohta¹,

Miyake²,

Hiura³

2011

Freshwater Biology

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Summary 1. The light : nutrient hypothesis (LNH) proposes that herbivore growth rates are maximised at intermediate light‐to‐nutrient ratios. A reduction to light intensity (i.e. decreased light‐to‐nutrient ratio) should lead to reduced food availability for herbivores while excessive light intensity in oligotrophic environments (i.e. increased light‐to‐nutrient ratios) should increase the C : N and C : P ratios of producers. However, this hypothesis has not yet been supported by studies on stream ecosystems. 2. We tested the LNH by experimental application of controlled natural gradients in light intensity to oligotrophic laboratory channels that included periphyton and the freshwater snail Gyraulus chinensis. 3. The results in this oligotrophic environment indicate that light regulated the flow of matter between trophic levels and grazer reproduction by controlling C : P ratios of the producers.

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Species-specific and transgenerational responses to increasing salinity in sympatric freshwater gastropods

Suski

Salice

Patiño

2012

Environmental Toxicology and Chemistry

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Freshwater salinization is a global concern partly attributable to anthropogenic salt contamination. The authors examined the effects of increased salinity (as NaCl, 250-4,000 µS/cm, specific conductance) on two sympatric freshwater gastropods (Helisoma trivolvis and Physa pomillia). Life stage sensitivities were determined by exposing naive eggs or naive juveniles (through adulthood and reproduction). Additionally, progeny eggs from the juvenile-adult exposures were maintained at their respective parental salinities to examine transgenerational effects. Naive H. trivolvis eggs experienced delayed development at specific conductance > 250 µS/cm; reduced survivorship and reproduction were also seen in juvenile H. trivolvis at 4,000 µS/cm. Survival and growth of P. pomilia were not affected by increased salinity following egg or juvenile exposures. Interestingly, the progeny of H. trivolvis exposed to higher salinity may have gained tolerance to increased salinity whereas P. pomilia progeny may have experienced negative transgenerational effects. The present study demonstrates that freshwater snail species vary in their tolerance to salinization and also highlights the importance of multigenerational studies, as stressor impacts may not be readily apparent from shorter term exposures.

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Effect of temperature on growth, reproduction and survival of the freshwater planorbid snail, Gyraulus convexiusculus, vector of echinostomiasis

Cited by 10 publications

References 11 publications

Different thermal conditions of lakes affect host–parasite systems: A case study of Viviparus contectus (Millet, 1813) and digenean trematodes

Different thermal conditions of lakes affect host–parasite systems: A case study of Viviparus contectus (Millet, 1813) and digenean trematodes

Light intensity regulates growth and reproduction of a snail grazer (Gyraulus chinensis) through changes in the quality and biomass of stream periphyton

Species-specific and transgenerational responses to increasing salinity in sympatric freshwater gastropods

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