Population Differences in Fecundity Components in the Hermaphroditic Freshwater Snail<i>Planorbella trivolvis</i>

Norton, Cynthia; Johnson, Angela F.; Nelson, Betsy M.

doi:10.4003/006.036.0109

Cited by 5 publications

(2 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly, Norton et al. (2018) reported that marsh rams‐horn snails reared at 22°C also produced 22 eggs/egg mass. Growth and egg production in the current study agreed with these reported values, indicating that the snails that were used in the second toxicity trial were healthy.…”

Section: Discussionmentioning

confidence: 85%

Effects of Multiple, Low‐Dose Copper Sulfate Treatments on the Marsh Rams‐Horn Snail

et al. 2021

View full text Add to dashboard Cite

Bolbophorus damnificus has caused epizootics in catfish aquaculture since the mid‐1990s. To mitigate the losses that are associated with trematode infestations, research has focused on eradicating snails from ponds. Whole‐pond treatments with 0.64–1.27 mg/L Cu have been effective in killing snails; however, Cu can be toxic to fish and may result in oxygen depletions due to its algacidal properties. Given these constraints, the potential for repeated low doses of Cu as a safe, yet effective snail treatment was investigated. Adult marsh rams‐horn snails Planorbella trivolvis received four weekly doses of 0, 0.10, 0.19, 0.38, and 0.76 mg/L Cu. All of the snails died after the first treatment of 0.76 mg/L Cu. The lowest doses of 0.10 and 0.19 mg/L Cu resulted in 68% and 88% cumulative mortality, respectively. This experiment was repeated with laboratory‐reared adult marsh rams‐horn snails in two different laboratories, resulting in 100% mortality in the 0.38 mg/L Cu treatment. A second study evaluated the effects of repeated Cu doses on egg and juvenile snail survival. Two weekly doses of 0.19 mg/L Cu were enough to kill embryos, and all of the doses ≥0.05 mg/L Cu prevented the snails from hatching. In a pond trial, 0.51 mg/L Cu killed 100% of the adult snails after two doses. The lowest dose of 0.13 mg/L Cu killed 60% of the snails after three doses. Repeated weekly doses <0.38 mg/L Cu may reduce adult snail populations, prevent eggs from hatching, and be safer for fish than a single dose of 0.64–1.27 mg/L Cu. These data also suggest that weekly doses <0.05 mg/L Cu may suppress marsh rams‐horn snail populations by limiting hatching and impeding juvenile survival.

show abstract

Section: Discussionmentioning

confidence: 85%

Effects of Multiple, Low‐Dose Copper Sulfate Treatments on the Marsh Rams‐Horn Snail

et al. 2021

View full text Add to dashboard Cite

show abstract

“…This might indicate that during the monitoring of snails in the laboratory, individuals from the Centre used the available resources more for growth than for other functions (e.g., survival, fecundity), compared to individuals from the North. This may be explained by the lower survival rate and fecundity slope in the central populations, reflecting a trade-off between growth, survival and fecundity in these populations [ 51 – 53 ]. On the other hand, growth slope was lower in treated populations compared to that in untreated ones.…”

Section: Discussionmentioning

confidence: 99%

Spatial variation of life-history traits in Bulinus truncatus, the intermediate host of schistosomes, in the context of field application of niclosamide in Côte d’Ivoire

Konan¹,

Tian-Bi²,

Diakité³

et al. 2022

BMC Zool

View full text Add to dashboard Cite

Background Control of intermediate host snails using molluscicides for the control and/or elimination of schistosomiasis is a strategy in line with WHO recommendations. Niclosamide is the main chemical molluscicide recommended by WHO. However, except the immediate killing of the snail, the extent of the impact of the molluscicide application on the evolution of snail life-history traits, in relation to recolonization of treated sites is not well known. This study aimed to characterize the spatial variation of life-history traits of populations of the freshwater snail Bulinus truncatus, in relation to niclosamide spraying in the field. From 2016 to 2018, we conducted a trial, using niclosamide to control the intermediate host snails for interrupting the seasonal transmission of urinary schistosomiasis in northern and central Côte d’Ivoire. Five villages (sites) were considered, including three test and two control villages. In the test villages, the molluscicide was sprayed in habitats harboring B. truncatus snails three times a year (November, February–March and June). We sampled six B. truncatus populations: two populations from the control villages without any treatment; one collected before treatment and three sampled 2–3 months after treatment of the site with niclosamide. The snail populations were monitored for several life-history traits, including survival, growth, fecundity and hatchability, under laboratory conditions, over one generation (G1). We tested the population, region (North/Centre) and treatment status (treated/untreated) effects on the variation of the measured life-history traits and correlations between pairs of traits were estimated. Results On the whole, the traits varied among populations. The risk of death was lower in northern populations compared to central ones. The age at first reproduction was reached earlier with a smaller size of snails in northern populations. Values of first reproduction features (size and fecundity) were lower in treated snail populations. The overall growth of untreated populations was higher than that of treated ones. The late fecundity and egg hatching were higher in northern than in central snails. At first reproduction, age was negatively correlated with some fecundity parameters. However, growth was positively associated with fecundity. Conclusions Our study showed a spatial variation of life-history traits in B. truncatus snails. The mollusciciding seems to have led to the depression of some life-history traits in the snail populations. However, investigations should be carried out over several generations of snails to better clarify the impact of niclosamide on the evolution of the life-history traits.

show abstract

Strong first sperm precedence in the freshwater hermaphroditic snail Planorbella trivolvis

Norton

Wright

2019

Invertebrate Reproduction & Development

View full text Add to dashboard Cite

Population Differences in Fecundity Components in the Hermaphroditic Freshwater SnailPlanorbella trivolvis

Cited by 5 publications

References 15 publications

Effects of Multiple, Low‐Dose Copper Sulfate Treatments on the Marsh Rams‐Horn Snail

Effects of Multiple, Low‐Dose Copper Sulfate Treatments on the Marsh Rams‐Horn Snail

Spatial variation of life-history traits in Bulinus truncatus, the intermediate host of schistosomes, in the context of field application of niclosamide in Côte d’Ivoire

Strong first sperm precedence in the freshwater hermaphroditic snail Planorbella trivolvis

Contact Info

Product

Resources

About