EFFECT OF DIFFERENT MOLLUSC ASSOCIATIONS ON TARGET MOLLUSC GROWTH AND PARASITE CERCARIAL PRODUCTION IN THE TRIPLE SYSTEM: <i>BULINUS WRIGHTI-SCHISTOSOMA BOVIS</i> AND <i>MELANOPSIS PRAEMORSA</i>

Mouahid, A.; Bouhaddioui, N; Jana, Mousumi; Combes, Claude; Moné, Hélène

doi:10.1093/mollus/58.4.349

Cited by 4 publications

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“…No comparable observation exists in other systems. It has been shown that the presence of host or non-host snails may (depending on density) increase or decrease cercarial output from infected snail species (Moné, 1991;Ferrer et al, 1991;Mouahid et al, 1992). This is not an immediate response though, and can largely be ascribed to the long-term positive or negative effect that non-target snails have on the growth rate of target snails and hence size-dependent cercarial production (but see Coles, 1973).…”

Section: Discussionmentioning

confidence: 99%

The Hydrobia ulvae–Maritrema subdolum association: influence of temperature, salinity, light, water-pressure and secondary host exudates on cercarial emergence and longevity

Mouritsen

2002

J. Helminthol.

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The effects of environmental factors and exudates from the amphipod Corophium volutator on the emergence of Maritrema subdolum cercariae (Digenea: Microphallidae) from the snail Hydrobia ulvae were investigated in the laboratory. Increasing the temperature (15 to 25 degrees C) caused an overall 11-fold increase in emergence rate under varying salinities (24 to 36 per thousand). The effect of salinity depended on the experimental temperature. Emergence increased with increasing salinity at higher temperatures, but decreased with increasing salinity at 15 degrees C. Whereas the different levels of salinity had no effect, increasing the temperature significantly reduced the life span of cercariae. In comparison with complete darkness, light caused a two-fold increase in emergence, whereas an increment of the water pressure from 1.0 to 1.3 ATM (corresponding to 0 and 3 m of depth) left the shedding rate unaffected. Unidentified exudates from the second intermediate host, C. volutator, significantly depressed the cercarial emergence rate. The main transmission window of M. subdolum seems to occur during low water in tidal pools where light levels are high and solar radiation rapidly elevates the water temperature, as well as salinity through evaporation. The consequence of such a transmission strategy is discussed in relation to the impact of M. subdolum on the population dynamics of the second intermediate host.

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Section: Discussionmentioning

confidence: 99%

The Hydrobia ulvae–Maritrema subdolum association: influence of temperature, salinity, light, water-pressure and secondary host exudates on cercarial emergence and longevity

Mouritsen

2002

J. Helminthol.

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“…1986; Moné 1991). Another prosobranch, Melanopsis praemorsa , showed experimentally the same cercariae‐stimulating effect on S. bovis in B. wrighti (Mouahid et al . 1992) and, under semifield conditions, stimulated both growth and reproduction of B. truncatus , an important intermediate host for S. haematobium (El Ouali et al .…”

Section: Discussionmentioning

confidence: 86%

Ecological and molecular studies on emerging schistosomiasis mansoni in Dhofar Governorate, Sultanate of Oman

Moné

Mouahid

Shaban

et al. 2003

Tropical Med Int Health

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Summary The recent detection of some cases of autochtonous schistosomiasis mansoni in Dhofar, Oman, prompted a search for the transmission sites. The five field surveys we conducted from November 2000 to February 2002 provided ecological data on schistosomiasis in Dhofar. Twenty‐eight water bodies situated within 8–160 km from Salalah, the largest city of Dhofar and at altitudes of up to 900 m, were surveyed for freshwater snails. Biomphalaria arabica was found in 15 of them. Three sites (Tibraq, Siginitti and Arazat) had Schistosoma infected snails, the first snails shedding cercariae of this parasite ever collected in Oman. The parasite from Dhofar was analysed by Random Amplified Polymorphic DNA comparisons using 11 primers and 167 polymorphic fragments and had 87–88% similarity with Schistosoma mansoni from Guadeloupe, but only 37–38% similarity with S. rodhaini from Burundi. Thus, it is a strain of S. mansoni. During the November 2000 survey, the prosobranch snail Melanoides tuberculata was associated with B. arabica in 10 of the 13 B. arabica sites. Cercariae from other species of Digenea emerged from five of the B. arabica sites, including the three named above. This paper presents the first finding of S. mansoni in the Dhofar Governorate and represents an initial study of the biology of S. mansoni transmission. This parasite and its cycle need further biological and molecular characterization, and the clarification of its epidemiological status in Dhofar Governorate is an urgent task.

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Croissance et reproduction deBulinus truncatus(Gastropoda : Planorbidae) en compétition intraspécifique et interspécifique avecMelanopsis praemorsa(Gastropoda : Melanopsidae)

Ouali

Ghamizi

Mouahid

et al. 1999

Ann. Limnol. - Int. J. Lim.

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EFFECT OF DIFFERENT MOLLUSC ASSOCIATIONS ON TARGET MOLLUSC GROWTH AND PARASITE CERCARIAL PRODUCTION IN THE TRIPLE SYSTEM: BULINUS WRIGHTI-SCHISTOSOMA BOVIS AND MELANOPSIS PRAEMORSA

Cited by 4 publications

References 0 publications

The Hydrobia ulvae–Maritrema subdolum association: influence of temperature, salinity, light, water-pressure and secondary host exudates on cercarial emergence and longevity

The Hydrobia ulvae–Maritrema subdolum association: influence of temperature, salinity, light, water-pressure and secondary host exudates on cercarial emergence and longevity

Ecological and molecular studies on emerging schistosomiasis mansoni in Dhofar Governorate, Sultanate of Oman

Croissance et reproduction deBulinus truncatus(Gastropoda : Planorbidae) en compétition intraspécifique et interspécifique avecMelanopsis praemorsa(Gastropoda : Melanopsidae)

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