Terrestrial Snail Fauna and Associated Helminth Parasites in a Tropical Semi-Urban Zone, Enugu State, Nigeria

Onyishi, Grace Chinenye; Aguzie, Ifeanyi Oscar; Okoro, Joseph O.; Nwani, Christopher Didigwu; Ezenwaji, Ngozi Evelyn; Oluah, Ndubisi Stanley; Okafor, Fabian Chukwuemenam

doi:10.17582/journal.pjz/2018.50.3.1079.1085

Cited by 9 publications

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“…In a way the temperature, the relative humidity of the air and the humidity of the substrate contribute to the activity of the terrestrial mollusks. Onyshi et al (2018), report in Nigeria that climatic conditions, especially high humidity and the rainy season are factors that favor the increase of the population of A. fulica.…”

Section: Discussionmentioning

confidence: 99%

“…Nowadays A. fulica has been reported in the most diverse environments such as forests, capoeiras, caatingas, savannahs, plantations, vegetable gardens, decomposing materials and urban areas (Eston et al, 2006;Ohlweiler et al, 2010;Santos, Delabie, 2011;Onyshi et al, 2018). Recently, infestation has been reported in urban areas of the Brazilian Amazon, probably due to transport of the mollusks in accidental loads; this is a matter of concern for the dispersal capacity and lack of natural mollusk predators (Moreira et al, 2013;Lima and Guilherme, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Achatina fulica (Gastropoda: Pulmonata): Occurrence, environmental aspects and presence of nematodes in Sergipe, Brazil

et al. 2020

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Abstract The objective of this study was to identify the occurrence of Achatina fulica in the Great Aracaju-SE Territory. This research was developed during the months of June 2016 to May 2017. The plots methodology was used for the monthly collections, following the collection time of 20 minutes per area. The mollusks were measured and soon afterwards the parasitological analysis of the mucus and faeces was performed. Molecular identification was performed to evaluate the possible presence of Angiostrongylus sp. We observed that the occurrence of A. fulica was more representative in urban areas, especially in vacant lots with the presence of litter and decomposing materials. In the specimens of A. fulica examined were male and female nematodes of the genus Rhabditis, in the research municipalities, except in Barra dos Coqueiros. No parasites of the genus Angiostrongylus were found in the mollusks examined. The influence of the presence of litter on the plots associated with the frequency of A. fulica was statistically significant. There was a correlation between the influence of rainfall and the frequency of A. fulica. A significant relationship between moisture and frequency and nematode positivity was identified. It was also observed that the larger the mollusk, the greater the chances of being infected by nematodes. Scientific knowledge about the biology of the A. fulica species associated with human intervention such as the maintenance of land and adequate sanitary measures may be important factors for a better control of this invasive mollusk.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Achatina fulica (Gastropoda: Pulmonata): Occurrence, environmental aspects and presence of nematodes in Sergipe, Brazil

et al. 2020

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“…The significant association found between the number of A. fulica and rainfall would likely account for the larger numbers of snails collected during the rainy seasons. In the metropolitan region of Aracaju, in Sergipe, Silva et al (2020) found that rainfall had a positive influence on the frequency of A. fulica, a pattern also observed in Nigeria by Onyshi et al (2018), who observed that the conditions of high humidity and rainfall were associated with an increase in the population of A. fulica. Despite this, the largest A. fulica specimens were collected during the dry season in the present study, reaching a mean of length of 5.36±1.11 cm and mass of 15.87±9.85 g. This may be accounted for by the fact that, even at high temperatures and under low rainfall, A. fulica, in particular the larger individuals, use specific behavioral strategies to cope with the relative humidity (Pilate et al 2017).…”

Section: Discussionmentioning

confidence: 60%

Relative condition factor and predictive model for the presence of the invasive snail Achatina (Lissachatina) fulica in Sergipe, Northeast Brazil

Silva

Thiengo²,

Menezes

et al. 2022

Biota Neotrop.

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Achatina fulica is among the world’s 100 most impactive invasive species, and is now found in almost all Brazilian states, including Sergipe. This exotic snail is known to have negative impacts, not only on the environment, due primarily to the rapid growth of its populations, but also on public health, given that it is an intermediate host of nematodes that cause zoonotic diseases. However, relatively little is known of the development of this snail, including its relative condition factor. We investigated the occurrence of A. fulica in 24 municipalities distributed in the eight subregions of the state of Sergipe in the dry and rainy season. Furthermore, we present here a predictive model for the occurrence of A. fulica based on the variation in climate and soil chemistry. This snail was more frequent on soils with a pH of 6.5-7.5. A negative correlation was found between the growth of A. fulica and the soil pH, then, the more acidic the soil, the more allometric the growth of A. fulica. The relative condition factor indicated differences in the development pattern of A. fulica among the eight subregions. The influence of rain in increasing the frequency of A. fulica showed a significant correlation. As well, higher temperatures influenced the resting behavior of A. fulica. The mathematical model used to identify the potential presence of A. fulica presented a high degree of agreement. This is the first ecological study of A. fulica to verify the association between the body mass-length relationship and the relative condition factor, and the results indicate that the development of this exotic land snail in Sergipe is influenced by climatic factors and principally, the soil pH. The predictive mathematical model provides valuable insights into the biotic and abiotic factors associated with the presence of A. fulica, and the influence of climatic variables and the chemical parameters of the soil on the occurrence of this species. These findings provide important guidelines for the development of measures for the control of A. fulica populations, which will contribute to both public and environment health.

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“…Isolation of parasites followed the methods according to Cheesbrough [21] and Onyishi et al [22]. The method according to Onyishi et al [22] describes light and teasing procedure which involves dipping the snail in a water container and exposing it under electric light for 2 hours and thereafter transferring the content to a petri dish and examining it for parasites. The shell of each snail was broken to expose the body of the snail.…”

Section: Isolation and Identification Of Parasitesmentioning

confidence: 99%

Helminthofauna of Three Wild Achatina Species from a Rural Community of South Eastern Nigeria: A Potential Public Health Problem

Elom

Okpara-Elom

2021

AJOB

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A total of 405 land snails were collected by hand picking from the study area between November 2018 and August 2019. The snails were morphologically identified using standard procedures. Shannon Weiner index was used to determine the distribution of the snail species during sampling. Light and teasing methods were used to isolate some of the parasites from the snails. The snails were dissected and different parts of the viscera were examined for parasites, using standard parasitological techniques. The isolated parasites were identified using parasitological guides. Achatina achatina was the most abundant snail species while A. marginata was the least abundant. Greater numbers of snails were collected in the wet season than in the dry season, with no observed complete dominance of any of the species. In the dry season, A. fulica was infected by almost all the parasites, with an overall highest prevalence of 32.69%. More snails were infected in wet season in comparison with the dry season, with higher prevalence of (46.91%vs 32.69%). There was co-infection of the snails with at least two of the parasite species. In both wet and dry seasons, A. marginata had an overall least infection prevalence of 11.77% and 4.55% respectively while A. Fulica was infected most with prevalence of (46.91%vs 32.69%). Proper cooking of snails, proper washing of vegetables, public health education and provision of good toilet facilities are recommended for control of snail-borne parasites especially the zoonotic ones.

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Terrestrial Snail Fauna and Associated Helminth Parasites in a Tropical Semi-Urban Zone, Enugu State, Nigeria

Cited by 9 publications

References 0 publications

Achatina fulica (Gastropoda: Pulmonata): Occurrence, environmental aspects and presence of nematodes in Sergipe, Brazil

Achatina fulica (Gastropoda: Pulmonata): Occurrence, environmental aspects and presence of nematodes in Sergipe, Brazil

Relative condition factor and predictive model for the presence of the invasive snail Achatina (Lissachatina) fulica in Sergipe, Northeast Brazil

Helminthofauna of Three Wild Achatina Species from a Rural Community of South Eastern Nigeria: A Potential Public Health Problem

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