Food selection by freshwater snails in the Gezira irrigation canals, Sudan

Madsen, Henry

doi:10.1007/bf00006587

Cited by 48 publications

(30 citation statements)

References 35 publications

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“…The relationships between aquatic snails differ from one species to the other. The negative correlations observed between M. tuberculata and some bulinids and planorbids are similar to other reports (Madsen, 1992;Giovanelli et al, 2005). The diet of M. tuberculata is similar to that of planorbids (Giovanelli et al, 2005), hence competition for food is possible.…”

Section: Discussionsupporting

confidence: 89%

“…The higher mean pH value recorded during the dry season could be due to higher transparency of the water bodies resulting in active removal of carbon (iv) oxide and consequently production of oxygen through photosynthesis. The concentration of hydrogen ions is rarely a factor conditioning the presence and distribution of the snails (Madsen, 1985). This probably explains the insignificant relationships between abundance of snails and pH values in our study.…”

Section: Discussioncontrasting

confidence: 62%

“…Egg production in Biomphalaria spp. has been shown to reduce at temperatures above 30 º C due to pathological changes in the reproductive system of the snails (Madsen, 1985).High temperature causes thermal stress in snail vectors and shows an inverse relationship with dissolved oxygen (Hofkins et al, 1991).The temperature range of 21.7 -29 °C recorded in all river bodies during the study appears therefore to be favourable to the aquatic snails, as there were no significant changes in temperature throughout the sampling seasons. The mean pH value in all the water bodies in the present study was within favourable limits for aquatic snail development (Boelee & Laamrani, 2004).…”

Section: Discussionmentioning

confidence: 77%

“…Several studies have reported the influence of temperature on certain stages of aquatic snails. The optimum temperatures for hatching B. globosus eggs is 25 -28 °C while at higher temperatures, hatching rate and survival decreases (Madsen, 1985). Egg production in Biomphalaria spp.…”

Section: Discussionmentioning

confidence: 99%

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The bionomics and diversity of freshwater snails species in Yewa North, Ogun State, Southwestern Nigeria

Salawu¹,

Odaibo

2014

Helminthologia

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Snail control as a form of integrated control for schistosomiasis has been strongly advocated but data on biocontrol using competitor snails are relatively lacking in most endemic areas. Monthly sampling of freshwater snails was conducted in four water bodies in Yewa North Local Government Area, Ogun State, Nigeria. Monthly in situ measurements of the physico-chemical characteristics of surface waters were carried out using field meters. A total number of 13 snail species were recovered from the water bodies. Of these, Bulinus camerunensis was reported for the first time in Nigeria. A significant positive relationship occurred between snail density and dissolved oxygen. Other important relationships were those between Lanistes lybicus and Bulinus senegalensis, Bulinus globosus and Bulinus jousseaumei, and B. senegalensis and Segmentorbis augustus. Snail control using competitor snails should be integrated into schistosomiasis management programmes in endemic areas in order to prevent residual schistosomiasis transmission after control intervention through mass drug treatment.

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Section: Discussionsupporting

confidence: 89%

Section: Discussioncontrasting

confidence: 62%

Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

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The bionomics and diversity of freshwater snails species in Yewa North, Ogun State, Southwestern Nigeria

Salawu¹,

Odaibo

2014

Helminthologia

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“…This effect appears to be due to both nutrient exchange and removal of epiphyton by feeding snails [10]. [11,12]. M. tuberculatus is capable of reaching high densities; hence, competition for space is also possible [13].…”

Section: Introductionmentioning

confidence: 99%

Freshwater Snail Distribution Related to Physicochemical Parameters and Aquatic Macrophytes in Giza and Kafr El-Shiekh Governorates, Egypt

Deeb¹,

El-Shenawy²,

Soliman³

et al. 2017

Int J Vet Sci Res

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A fi eld work was conducted to study the density of the freshwater snail in relation to the vegetation cover as well as the physical and chemical properties in different watercourses. Two sites were selected in Giza governorate while, three sites were selected at Kafr El-Shiekh governorate. Water temperature, conductivity, total hardness, and pH were measured in the selected sites as well as bisphenol A (BPA) levels. Snail sampling was carried out and all types of macrophytes found in each site were collected, identifi ed and coverage. Nine snails species namely Biomphalaria alexandrina, Physa acuta, Planorbis planorbis, Lymnaea natalensis, Bulinus truncates, Bellamya unicolor, Melanoides tuberculata, Helisoma duryi and Lanistes carinatus were identifi ed. B. alexandrina was the most enumeration of snail species. The percentage of total snail species (75.47 %) was recorded at 28 °C as compared to 5.86 % recorded at 34 °C. Five species of aquatic vegetation were identifi ed, two of them correlated positively and signifi cantly with various snail species. Sites in which snails associated with macrophytes were characterized with higher ranges of chemicals, dissolved oxygen, and conductivity. In conclusion, the most important of the associating vegetation was L. gibba which correlated with B. alexandrina and served as an indicator plant.

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Diet quality affects chemical tolerance in the freshwater snail Lymnaea stagnalis

Fidder

Reátegui‐Zirena

Salice

2018

Enviro Toxic and Chemistry

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Organisms generally select high-quality diets to obtain maximal energy while devoting the least amount of time and energy. Diets, however, can vary in natural systems. In ecotoxicological testing, the effect of diet type on organismal responses to toxicants has not been explored despite the potential for dietary effects to influence toxicological endpoints. We first evaluated diet quality using growth rate and sensitivity to the fungicide pyraclostrobin of Lymnaea stagnalis fed lettuce (common laboratory diet), turtle pellets (high nutrient composition), and a combination diet of both food items. We also measured the macronutrient content of snails raised on the multiple diets to determine how diet may have impacted energy allocation patterns. Finally, we evaluated whether snails discernibly preferred a particular diet. Snails fed high-nutrient and combination diets grew larger overall than snails fed a lettuce-only diet. Snails fed the high-nutrient and combination diets, both juvenile and adult, were significantly more tolerant to pyraclostrobin than snails fed lettuce. When measured for macronutrient content, snails raised on high-nutrient and combination diets had significantly higher carbohydrate content than snails fed lettuce. Despite the strong effects of diet type, snails did not exhibit a clear diet choice in preference trials. Dietary composition clearly influences growth rate, sensitivity, and macronutrient content of Lymnaea stagnalis. These results suggest that the nutritional environment has potentially strong impacts on toxicant sensitivity. Environ Toxicol Chem 2018;37:1158-1167. © 2017 SETAC.

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Food selection by freshwater snails in the Gezira irrigation canals, Sudan

Cited by 48 publications

References 35 publications

The bionomics and diversity of freshwater snails species in Yewa North, Ogun State, Southwestern Nigeria

The bionomics and diversity of freshwater snails species in Yewa North, Ogun State, Southwestern Nigeria

Freshwater Snail Distribution Related to Physicochemical Parameters and Aquatic Macrophytes in Giza and Kafr El-Shiekh Governorates, Egypt

Diet quality affects chemical tolerance in the freshwater snail Lymnaea stagnalis

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