Effects of starvation on growth and reproductive apparatus of two immature freshwater snails Biomphalaria pfeifferi and Biomphalaria glabrata (Gastropoda: Planorbidae)

Hydrobiologia ◽  
1984 ◽  
Vol 109 (2) ◽  
pp. 165-172 ◽  
Author(s):  
Marc Vianey-Liaud
Keyword(s):  
Biomphalaria Glabrata ◽  
Freshwater Snails ◽  
Biomphalaria Pfeifferi ◽  
Reproductive Apparatus

scholarly journals MALDI-TOF mass spectrometry for the identification of freshwater snails from Senegal, including intermediate hosts of schistosomes

2021 ◽  
Vol 15 (9) ◽  
pp. e0009725
Author(s):  
Fatima Zohra Hamlili ◽  
Fatou Thiam ◽  
Maureen Laroche ◽  
Adama Zan Diarra ◽  
Souleymane Doucouré ◽  
...  
Keyword(s):  
Neglected Diseases ◽  
Freshwater Snails ◽  
Snail Species ◽  
Correct Identification ◽  
Intermediate Hosts ◽  
Biomphalaria Pfeifferi ◽  
Bulinus Truncatus ◽  
Maldi Tof Ms ◽  
Maldi Tof ◽  
Tof Ms

Freshwater snails of the genera Biomphalaria, Bulinus, and Oncomelania are intermediate hosts of schistosomes that cause human schistosomiasis, one of the most significant infectious neglected diseases in the world. Identification of freshwater snails is usually based on morphology and, potentially, DNA-based methods, but these have many drawbacks that hamper their use. MALDI-TOF MS has revolutionised clinical microbiology and has emerged in the medical entomology field. This study aims to evaluate MALDI-TOF MS profiling for the identification of both frozen and ethanol-stored snail species using protein extracts from different body parts. A total of 530 field specimens belonging to nine species (Biomphalaria pfeifferi, Bulinus forskalii, Bulinus senegalensis, Bulinus truncatus, Bulinus globosus, Bellamya unicolor, Cleopatra bulimoides, Lymnaea natalensis, Melanoides tuberculata) and 89 laboratory-reared specimens, including three species (Bi. pfeifferi, Bu. forskalii, Bu. truncatus) were used for this study. For frozen snails, the feet of 127 field and 74 laboratory-reared specimens were used to validate the optimised MALDI-TOF MS protocol. The spectral analysis yielded intra-species reproducibility and inter-species specificity which resulted in the correct identification of all the specimens in blind queries, with log-score values greater than 1.7. In a second step, we demonstrated that MALDI-TOF MS could also be used to identify ethanol-stored snails using proteins extracted from the foot using a specific database including a large number of ethanol preserved specimens. This study shows for the first time that MALDI-TOF MS is a reliable tool for the rapid identification of frozen and ethanol-stored freshwater snails without any malacological expertise.

scholarly journals Competitive interactions between species of freshwater snails. I. Laboratory studies: Ib. Comparative studies of the dispersal and the vagility capabilities of Biomphalaria glabrata and Biomphalaria straminea

1984 ◽  
Vol 79 (2) ◽  
pp. 163-167 ◽  
Author(s):  
Frederico S. Barbosa ◽  
D. P. Pereira da Costa ◽  
F. Arruda
Keyword(s):  
Comparative Studies ◽  
Biomphalaria Glabrata ◽  
Field Conditions ◽  
Current Paper ◽  
Competitive Interactions ◽  
Freshwater Snails ◽  
Laboratory Studies ◽  
Biomphalaria Straminea

Experiments reported in the current paper, carried out under semi-field conditions created in the laboratory, have shown that b. straminea has competitive superiority when compared with B. glabrata. The former species has shown higher capabilities of both dispersal and vagility. In addition, B. straminea was able to compete sucessfully with B. glabrata.

scholarly journals Environmental determinants of distribution of freshwater snails and trematode infection in the Omo Gibe River Basin, southwest Ethiopia

2019 ◽  
Vol 8 (1) ◽  
Author(s):  
Seid Tiku Mereta ◽  
Jemal Bedewi ◽  
Delenasaw Yewhalaw ◽  
Belayhun Mandefro ◽  
Yihun Abdie ◽  
...  
Keyword(s):  
Open Field ◽  
Human Activities ◽  
Livestock Grazing ◽  
Freshwater Snails ◽  
Infection Rates ◽  
Biomphalaria Pfeifferi ◽  
Water Contact ◽  
Southwest Ethiopia ◽  
Trematode Infection ◽  
Open Field Defecation

Abstract Background Determination of infection rates of snail populations is one of the basic tools for epidemiological studies of snail borne diseases. In this study, we opted to determine the trematode infection of freshwater snails in the Omo-Gibe River Basin, southwest Ethiopia. Methods We collected snail samples from 130 observation sites in lakes, wetlands, rivers, reservoirs and irrigation canals surveyed during the dry season (March to May) in 2016. The snail samples were examined for trematode infections by cercarial shedding immediately after collection. Habitat conditions, water quality, human water contact practices and other human activities were assessed at each survey site. A redundancy analysis (RDA) was used to examine the relationship between cercarial infection and environmental variables. The statistical significance of eigenvalues and cercariae-environment correlations generated by the RDA were tested using Monte Carlo permutations at 499 permutations. Results A total of 3107 snails belonging to five species were collected. The most abundant species was Biomphalaria pfeifferi, representing 66% of the total collection. Overall, 109 (3.6%) of the snails were found infected with trematodes (cercariae). Biomphalaria pfeifferi was found to be the most highly infected, accounting 85% of all infected snails. A total of eight morphologically different types of cercariae were recorded, which included: Echinostoma cercariae, brevifurcate apharyngeate distome cercariae, amphistome cercariae, brevifurcate apharyngeate monostome cercariae, xiphidiocercariae, longifurcate pharyngeate distome cercariae, strigea cercariae and unidentified cercariae. Brevifurcate apharyngeate distome cercariae, and Echinostoma cercariae were the most abundant cercariae, accounting for 36 and 34% of all infection, respectively. The mean concentration of water conductivity and 5 days biological oxygen demand were higher in irrigation canals and lake sampling points. Human activities such as open field defecation, urination, livestock grazing, farming, and swimming were highly correlated with trematode infection. Conclusions The abundance, occurrence and infection rates of snail species were largely influenced by water physicochemical quality, sanitation and water contact behaviour of the inhabitants. Human activities, such as open field defecation and urination, livestock grazing, farming, and swimming were important predictors of the abundance of cercariae. Therefore, awareness creation should be implemented for proper containment of excreta (urine and faeces) and reducing human and animal contacts with surface waters to reduce snail-borne disease transmission.

scholarly journals Associations between trematode infections in cattle and freshwater snails in highland and lowland areas of Iringa Rural District, Tanzania

Parasitology ◽  
2015 ◽  
Vol 142 (11) ◽  
pp. 1430-1439 ◽  
Author(s):  
JAHASHI NZALAWAHE ◽  
AYUB A. KASSUKU ◽  
J. RUSSELL STOTHARD ◽  
GERALD C. COLES ◽  
MARK C. EISLER
Keyword(s):  
Fasciola Gigantica ◽  
Rural District ◽  
Water Bodies ◽  
Freshwater Snails ◽  
Infection Rates ◽  
Biomphalaria Pfeifferi ◽  
Melanoides Tuberculata ◽  
Schistosoma Bovis ◽  
Trematode Infections ◽  
Lymnaea Natalensis

SUMMARYThe epidemiology of trematode infections in cattle was investigated within highland and lowland areas of Iringa Rural District, in southern Tanzania. Fecal samples were collected from 450 cattle in 15 villages at altitudes ranging from 696 to 1800 m above the sea level. Freshwater snails were collected from selected water bodies and screened for emergence of cercariae. The infection rates in cattle wereFasciola gigantica28·2%, paramphistomes 62·8% andSchistosoma bovis4·8%. Notably, prevalence of trematode infections in cattle was much higher in highland (altitude > 1500 m) as compared with lowland (altitude < 1500 m) areas and was statistically significant (P-value = 0·000) forF. giganticaand paramphistomes but not forS. bovis. The snails collected includedLymnaea natalensis, Bulinus africanus, Bulinus tropicus, Bulinus forskali, Biomphalaria pfeifferi, Melanoides tuberculataandBellamya constrictawith a greater proportion of highland (75%) than lowland (36%) water bodies harbouring snails. Altitude is a major factor shaping the epidemiology ofF. giganticaand paramphistomes infections in cattle in Iringa Rural District with greater emphasis upon control needed in highland areas.

scholarly journals Prevalence of Schistosoma mansoni and S. haematobium in Snail Intermediate Hosts in Africa: A Systematic Review and Meta-analysis

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Tamirat Hailegebriel ◽  
Endalkachew Nibret ◽  
Abaineh Munshea
Keyword(s):  
Schistosoma Mansoni ◽  
Control Strategies ◽  
Meta Analysis ◽  
Random Effect ◽  
Random Effect Model ◽  
Freshwater Snails ◽  
Intermediate Hosts ◽  
African Countries ◽  
Biomphalaria Pfeifferi ◽  
Pooled Prevalence

Background. Schistosomiasis is caused by Schistosoma mansoni and S. haematobium in Africa. These schistosome parasites use freshwater snail intermediate hosts to complete their lifecycle. Varied prevalence rates of these parasites in the snail intermediate hosts were reported from several African countries, but there were no summarized data for policymakers. Therefore, this study was aimed to systematically summarize the prevalence and geographical distribution of S. mansoni and S. haematobium among freshwater snails in Africa. Methods. Literature search was carried out from PubMed, Science Direct, and Scopus which reported the prevalence of S. mansoni and S. haematobium among freshwater snails in Africa. The pooled prevalence was determined using a random-effect model, while heterogeneities between studies were evaluated by I2 test. The meta-analyses were conducted using Stata software, metan command. Results. A total of 273,643 snails were examined for the presence of S. mansoni and S. haematobium cercaria in the eligible studies. The pooled prevalence of schistosome cercaria among freshwater snails was 5.5% (95% CI: 4.9–6.1%). The pooled prevalence of S. mansoni and S. haematobium cercaria was 5.6% (95% CI: 4.9–6.3%) and 5.2% (95% CI: 4.6–5.7%), respectively. The highest pooled prevalence was observed from Nigeria (19.0%; 95% CI: 12.7–25.3%), while the lowest prevalence was reported from Chad (0.05%; 95% CI: 0.03–0.13). Higher prevalence of schistosome cercaria was observed from Bulinus globosus (12.3%; 95% CI: 6.2–18.3%) followed by Biomphalaria sudanica (6.7%; 95% CI: 4.5–9.0%) and Biomphalaria pfeifferi (5.1%; 95% CI: 4.1–6.2%). The pooled prevalence of schistosome cercaria obtained using PCR was 26.7% in contrast to 4.5% obtained by shedding cercariae. Conclusion. This study revealed that nearly 6% of freshwater snails in Africa were infected by either S. haematobium or S. mansoni. The high prevalence of schistosomes among freshwater snails highlights the importance of appropriate snail control strategies in Africa.

scholarly journals Elevage de Biomphalaria glabrata, Say, au laboratoire

1977 ◽  
Vol 30 (3) ◽  
pp. 293 ◽  
Author(s):  
M. Graber ◽  
Jacques Euzéby ◽  
J. Gevrey
Keyword(s):  
Schistosoma Mansoni ◽  
Lutte Biologique ◽  
Biomphalaria Glabrata ◽  
Biomphalaria Pfeifferi ◽  
Schistosoma Bovis

Les auteurs décrivent une méthode d'élevage de Biomphalaria glabrata, Say, au laboratoire, méthode nécessitant l'emploi successif et, dans des conditions qui sont bien précisées, de bacs de ponte et de bacs de croissance. Bien que concernant un Planorbe hôte intermédiaire de Schistosoma mansoni, l'agent de la bilharziose intestinale humaine, les renseignements fournis présentent un certain intérêt en médecine vétérinaire, car ils peuvent, dans leur ensemble, être transposés à d'autres mollusques vecteurs de Trématodoses animales (Fasciolose, paramphistomose, bilharzioses à Schistosoma bovis et à Schistosoma mattheei): Limnaea natalensis, Biomphalaria pfeifferi, Bulins appartenant aux genres Physopsis, Bulinus s. str. (toute la série polyploïde) et Pyrgophysa. En outre, lorsque les conditions climatiques s'y prêtent, cette méthode, simple et pratique, permet de disposer constamment, et quelle que soit la saison, d'importantes populations de Biomphalaria glabrata destinées à diverses recherches d'ordre général, notamment les essais de molluscicides et la lutte biologique contre les mollusques vecteurs, recherches qui intéressent à la fois la médecine humaine et la médecine vétérinaire tropicale notamment

Sign in / Sign up

Export Citation Format

Share Document