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Abundance and Annual Distribution of Freshwater Snails and Some Trematode Cercariae at Damietta Governorate, Egypt. Helminthologia 2021; 58:233-247. [PMID: 34934387 PMCID: PMC8647957 DOI: 10.2478/helm-2021-0026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 05/12/2021] [Indexed: 11/20/2022] Open
Abstract
In addition to being a good food source, freshwater snails are considered one of the positively and negatively influencing invertebrates on the environment. Several biotic and abiotic factors are thought to affect the distribution and the dynamics of these snails. Freshwater snails are the most dominant and conspicuous individuals of the freshwater biota in Damietta Governorate. In this study, freshwater snails were collected monthly from 5 geographically and environmentally different sites at Damietta Governorate at the north of Egypt during June 2017-May 2018. Seven snail species; Lanistes carinatus, Lanistes varicus, Pila wernei, Segmentorbis angustus, Melanoides tuberculata, Biomphalaria alexandrina, and Gabbiella senoriansis, were identified. Lanistes carinatus was the most abundant species (56.4%) in the collection sites. Besides, Al-Inaniyyah village had the highest snail species abundance and variety. The abundance of the most recorded species varied seasonally; the highest abundance was recorded during summer while the lowest was during winter. The abundance of some snail species correlated positively or negatively with some physico-chemical parameters; water temperature, dissolved oxygen, conductivity, total dissolved salts, and electrical conductivity. Two types of trematode cercariae; gymnocephalus cercariae and xiphidiocercariae, were harvested from Lanistes carinatus. The highest prevalence of both cercarial types was detected during summer. The correlation between the prevalence of both cercarial types and the physico-chemical parameters were determined. Xiphidiocercariae were the most predominant cercarial type in Damietta Governorate. Our findings suggest that the invasion of some freshwater snails is likely to be the cause of the low prevalence or complete absence of some medically important intermediate snail hosts. We recommend further characterization of the distribution of freshwater snails and the interrelationships among them in Egypt, and suggest a controlled use of selected snail species to combat their medically important analogues.
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Maldonado MA, Martín PR. Dealing with a hyper-successful neighbor: effects of the invasive apple snail Pomacea canaliculata on exotic and native snails in South America. Curr Zool 2019; 65:225-235. [PMID: 31263482 PMCID: PMC6595424 DOI: 10.1093/cz/zoy060] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 07/05/2018] [Indexed: 11/14/2022] Open
Abstract
Pomacea canaliculata is a successful invader and also a competitor and predator of other snails and may play a key role in structuring freshwater snail communities both in its native and invaded range. In the present study we evaluated the contact and distant effects of P. canaliculata in its native range on exotic (Melanoides tuberculata and Physa acuta) and native snails (Heleobia parchappii, Biomphalaria peregrina, and Chilina parchappii). Habitat use was affected in P. acuta, H. parchappii, and B. peregrina by contact effects of P. canaliculata, whereas survival was only affected in P. acuta through combined contact and distant effects. Fecundity was reduced in P. acuta and B. peregrina by combined contact and distant effects; evidence of egg mass predation was also observed in both species. Melanoides tuberculata was not affected at all by P. canaliculata. The snail species with higher withdrawal responses to contacts with P. canaliculata were those that suffered less mortality by corporal contact, whereas snails with high crawling away responses suffered from higher mortality. The effects of P. canaliculata seem to be highly negative to small nonoperculate snails that lay gelatinous egg masses, whereas large operculate ovoviviparous snails are not affected in their survival and reproduction. This apple snail may exert biotic resistance against P. acuta but could favor the establishment of M. tuberculata and other functionally similar species in new habitats in South America.
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Affiliation(s)
- Mara A Maldonado
- Laboratorio de Ecología (DBByF), INBIOSUR (Universidad Nacional del Sur-CONICET), San Juan 670, Bahía Blanca, Argentina
| | - Pablo R Martín
- Laboratorio de Ecología (DBByF), INBIOSUR (Universidad Nacional del Sur-CONICET), San Juan 670, Bahía Blanca, Argentina
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Anto F, Bimi L. Potential of Lanistes varicus in limiting the population of Bulinus truncatus. BMC Res Notes 2017; 10:509. [PMID: 29070058 PMCID: PMC5657124 DOI: 10.1186/s13104-017-2837-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 10/19/2017] [Indexed: 11/29/2022] Open
Abstract
Objective To determine the ability of the Ampullariid, Lanistes varicus to prey on egg masses and juveniles of Bulinus truncatus snails, an intermediate host of urogenital schistosomiasis in West Africa. Results Lanistes varicus was found to feed voraciously on egg masses and juveniles of Bulinus truncatus, consuming all egg masses (20 –25) exposed to it within 24 h. Also, 95–100% of 1–2 days old B. truncatus snails exposed to a single L. varicus snail was consumed within 4 days. The presence of L. varicus snails greatly increased mortality in B. truncatus with mortality increasing with increase in the number of L. varicus snails in the mixture of the two snail species. The current study has demonstrated under laboratory conditions that the Ghanaian strain of L. varicus has the potential of limiting the population of B. truncatus snails, and contribute to the control of urogenital schistosomiasis in West Africa. Electronic supplementary material The online version of this article (doi:10.1186/s13104-017-2837-9) contains supplementary material, which is available to authorized users.
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Hayes KA, Burks RL, Castro-Vazquez A, Darby PC, Heras H, Martín PR, Qiu JW, Thiengo SC, Vega IA, Wada T, Yusa Y, Burela S, Cadierno MP, Cueto JA, Dellagnola FA, Dreon MS, Frassa MV, Giraud-Billoud M, Godoy MS, Ituarte S, Koch E, Matsukura K, Pasquevich MY, Rodriguez C, Saveanu L, Seuffert ME, Strong EE, Sun J, Tamburi NE, Tiecher MJ, Turner RL, Valentine-Darby PL, Cowie RH. Insights from an Integrated View of the Biology of Apple Snails (Caenogastropoda: Ampullariidae). MALACOLOGIA 2015. [DOI: 10.4002/040.058.0209] [Citation(s) in RCA: 124] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Dida GO, Gelder FB, Anyona DN, Matano AS, Abuom PO, Adoka SO, Ouma C, Kanangire CK, Owuor PO, Ofulla AVO. Distribution and abundance of schistosomiasis and fascioliasis host snails along the Mara River in Kenya and Tanzania. Infect Ecol Epidemiol 2014; 4:24281. [PMID: 25405008 PMCID: PMC4216393 DOI: 10.3402/iee.v4.24281] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 09/23/2014] [Accepted: 10/02/2014] [Indexed: 11/14/2022] Open
Abstract
We purposively selected 39 sampling sites along the Mara River and its two perennial tributaries of Amala and Nyangores and sampled snails. In addition, water physicochemical parameters (temperature, turbidity, dissolved oxygen, conductivity, alkalinity, salinity and pH) were taken to establish their influence on the snail abundance and habitat preference. Out of the 39 sites sampled, 10 (25.6%) had snails. The snail species encountered included Biomphalaria pfeifferi Krauss – the intermediate host of Schistosoma mansoni Sambon, Bulinus africanus – the intermediate host of Schistosoma haematobium, and Lymnaea natalensis Krauss – the intermediate host of both Fasciola gigantica and F. hepatica Cobbold. Ceratophallus spp., a non-vector snail was also encountered. Most (61.0%) of the snails were encountered in streamside pools. Schistosomiasis-transmitting host snails, B. pfeifferi and B. africanus, were fewer than fascioliasis-transmitting Lymnaea species. All the four different snail species were found to be attached to different aquatic weeds, with B. pfeifferi accounting for over half (61.1%) of the snails attached to the sedge, followed by B. africanus and Lymnaea spp., accounting for 22.2 and 16.7%, respectively. Ceratophallus spp. were non-existent in sedge. The results from this preliminary study show that snails intermediate hosts of schistosomiasis and fascioliasis exists in different habitats, in few areas along the Mara River, though their densities are still low to have any noticeable impacts on disease transmission in case they are infected. The mere presence of the vector snails in these focal regions calls for their immediate control and institution of proper regulations, management, and education among the locals that can help curtail the spread of the snails and also schistosomiasis and fascioliasis within the Mara River basin.
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Affiliation(s)
- Gabriel O Dida
- School of Public Health and Community Development, Maseno University, Maseno, Kenya ; Department of Vector Ecology and Environment, Institute of Tropical Medicine (NEKKEN), Nagasaki University, Nagasaki, Japan
| | - Frank B Gelder
- Probe International, Inc., Copley, OH, USA ; Probe International, Inc., Auckland, New Zealand
| | - Douglas N Anyona
- School of Environment and Earth Science, Maseno University, Maseno, Kenya
| | - Ally-Said Matano
- School of Environment and Earth Science, Maseno University, Maseno, Kenya ; EAC-Lake Victoria Basin Commission Secretariat, Kisumu, Kenya
| | - Paul O Abuom
- School of Environment and Earth Science, Maseno University, Maseno, Kenya
| | - Samson O Adoka
- School of Public Health and Community Development, Maseno University, Maseno, Kenya
| | - Collins Ouma
- School of Public Health and Community Development, Maseno University, Maseno, Kenya
| | | | | | - Ayub V O Ofulla
- School of Public Health and Community Development, Maseno University, Maseno, Kenya
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