The Effect of Light, Temperature and pH on the Emergence of Schistosoma japonicum Cercariae from Oncomelania nosophora

Gumble, Adaline; Otori, Y.; Ritchie, L. S.; Huntér, George W.

doi:10.2307/3223925

Cited by 18 publications

(14 citation statements)

References 7 publications

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“…5). Laboratory studies have demonstrated that tempera= ture may be an important factor influencing life-history traits of larval trematodes within their poikilotherm intermediate hosts (Rees, 1948;Stirewalt, 1954;Gumble et al, 1957;Watertor, 1968;Shostak & Esch, 1990). The generally reported positive relationship between temperature and production of cercariae suggests that the high temperatures during spring 1990 were an important factor causing the present mass development of trematode larvae in H. ulvae and, in turn, their successful transmission to C. volutator.…”

Section: Discussionmentioning

confidence: 99%

Mass mortality in two common soft-bottom invertebrates,Hydrobia ulvae andCorophium volutator-the possible role of trematodes

Jensen

Mouritsen

1992

Helgolander Meeresunters

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At the same time, the C. volutator population became extinct. Since other conceivable mortality factors could be ruled out, parasites are suspected to be the causative agent. Apart from the expected effects on potential predators by the decline in the two invertebrate populations, the benthic community changed and destabilization of the substratum occurred probably because of the die-off in C. volutator. Meteorological data suggest high temperatures as a triggering factor of the massdevelopment of the studied trematodes.

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Section: Discussionmentioning

confidence: 99%

Mass mortality in two common soft-bottom invertebrates,Hydrobia ulvae andCorophium volutator-the possible role of trematodes

Jensen

Mouritsen

1992

Helgolander Meeresunters

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“…In the laboratory, snails become inactive at temperatures below 2-4°C (Su, 1986). Cercarial shedding for Oncomelania also begins roughly at 10°C (Gumble et al, 1957). Research on O. hupensis snails from a nearby province found that 50% of snails hibernated at 6.4°C, schistosome cercarial development ceased below 15.3°C, while fastest development of snails occurred at 30°C (Yang et al, 2007).…”

Section: Introductionmentioning

confidence: 97%

Impact of Changing Water Levels and Weather on Oncomelania hupensis hupensis Populations, the Snail Host of Schistosoma japonicum, Downstream of the Three Gorges Dam

Seto

Liu

et al. 2008

EcoHealth

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Increasing evidence indicates that dams impact riverine ecosystems and human diseases. Poyang Lake, one of the largest schistosomiasis endemic environments in China, will change due to the construction of the Yangtze River Three Gorges Dam. We assess changes in Oncomelania hupensis hupensis, the snail host for Schistosoma japonicum, in response to changing water levels and weather from 1998 to 2002. In the 5 years following the major flooding of Poyang Lake in 1998, seasonal water levels have gradually decreased, concomitant with decreases in mean and variance of fall snail densities. Nonlinear relationships suggest that the highest spring density is associated with current, 2-, and 3-month prior temperatures of 18 degrees, 9.1 degrees, and 5.8 degrees C, while the highest fall density is associated with 2- and 3-month prior water levels of 17 and 18 m, respectively. This suggests that lower, more stable water levels downstream of the dam may result in a reduction in mean fall densities and their variance. However, additional data are needed to determine whether snail populations that are typically destroyed by seasonal floods may live longer in more stable environments created by the dam.

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“…De nombreux travaux ont étudié l'influence des facteurs environnementaux sur la sortie des cercaires de Schistosoma japonicum, (Isobe, 1923 ;Osaka, 1938 ;Bauman et al, 1948 ;Mao et al, 1949 ;Komiya et Ishii, 1954 ;Gumble et al, 1957 ;Pesigan et al, 1958) en particulier concernant la lumière, la température et le pH de l'eau, les périodes d'immersion ou d'émersion des mollusques. Ces recherches qui ont surtout porté sur l'aspect quantitatif de la production cercarienne ont également fourni des informations sur les périodes du nycthémère les plus favorables à l'émission.…”

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Rythme d émission des cercaires deSchistosoma japonicumde Chine continentale par desOncomelania hupensis

Thèron

Mingyi²

1986

Ann. Parasitol. Hum. Comp.

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The Effect of Light, Temperature and pH on the Emergence of Schistosoma japonicum Cercariae from Oncomelania nosophora

Cited by 18 publications

References 7 publications

Mass mortality in two common soft-bottom invertebrates,Hydrobia ulvae andCorophium volutator-the possible role of trematodes

Mass mortality in two common soft-bottom invertebrates,Hydrobia ulvae andCorophium volutator-the possible role of trematodes

Impact of Changing Water Levels and Weather on Oncomelania hupensis hupensis Populations, the Snail Host of Schistosoma japonicum, Downstream of the Three Gorges Dam

Rythme d émission des cercaires deSchistosoma japonicumde Chine continentale par desOncomelania hupensis

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