The Effects of Various Light Regimens on the Emergence of Plagiorchis noblei Cercariae from the Molluscan Intermediate Host, Stagnicola elodes

Webber, R. A.; Rau, Manfred E.; Lewis, D. J.

doi:10.2307/3281459

Cited by 8 publications

(3 citation statements)

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“…is similar to that observed for the cercariae of a variety of species of the genus Plagiorchis by several authors, e.g. Plagiorchis vespertilionis parorchis by Macy (1960), Plagiorchis micracanthos by Wagenbach & Alldredge (1974), Plagiorchis neomidis by Théron 1976, and Plagiorchis noblei by Blankespoor (1977) and Webber et al (1986).…”

Section: Discussionsupporting

confidence: 90%

Photoperiodic cercarial emergence patterns of the digeneans Echinoparyphium recurvatum and Plagiorchis sp. from a mixed infection in Lymnaea peregra

McCarthy

1999

J. Helminthol.

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Photoperiodic emergence patterns of the cercariae of two digeneans, Echinoparyphium recurvatum (Echinostomatidae) and Plagiorchissp. (Plagiorchiidae), were studied experimentally using a photoperiodic regime of 12 h light: 12 h dark at a constant 18°C. In single species infections of the first intermediate host snail Lymnaea peregra, the cercariae of E. recurvatum emerged exclusively during the light phase and those of Plagiorchis sp. emerged exclusively during the dark phase. In double infections, each species retained its own discrete photoperiodic emergence pattern. This result demonstrates the absence of interference between the mechanisms responsible for the photoperiodic emergence pattern of each species. A degree of interference between the two parasites in double infections of L. peregra was evident. The presence of E. recurvatum significantly reduced the number of Plagiorchis sp. cercariae emerging in a 24 h period and also delayed the mean peak emergence time of Plagiorchissp. cercariae by 2 h. This result is consistent with the well documented antagonistic effect that the redial stages of echinostomes are known to have against the sporocysts of other digeneans within the same host mollusc.

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Section: Discussionsupporting

confidence: 90%

Photoperiodic cercarial emergence patterns of the digeneans Echinoparyphium recurvatum and Plagiorchis sp. from a mixed infection in Lymnaea peregra

McCarthy

1999

J. Helminthol.

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“…The biology of the various stages of P. elegans has been described (Styczynska-Jurewicz, 1962;Genov & Samnaliev, 1984). Cercariae emerge nocturnally from the snail first intermediate host (Genov & Samnaliev, 1984;Webber et al 1986) and penetrate a wide range of aquatic insects. Cercariae transform into metacercariae within the haemocoel of the insect.…”

Section: Plagiorchis Elegansmentioning

confidence: 99%

“…Swennen (1969) reported that the mollusc Macoma balthica infected with gymnophallid trematodes left tracks in the sand and was more conspicuous to predators. Pearre (1979) reported that chaetognaths infected with digeneans were more conspicuous and more susceptible to predation than non-infected individuals, and Webber, Rau & Lewis (1986) showed that Aedes aegypti larvae infected with Plagiorchis elegans (identified as Plagiorchis noblei) metacercariae spent more time at the surface and were more vulnerable to predation by mammalian definitive hosts. For a review of interactions between invertebrate hosts and parasites see Hurd (1990).…”

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confidence: 99%

Plagiorchis elegans: emergence, longevity and infectivity of cercariae, and host behavioural modifications during cercarial emergence

Lowenberger

Rau

1994

Parasitology

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We investigated changes in the behaviour of Stagnicola elodes associated with the emergence of Plagiorchis elegans cercariae. Within 15 min of the reduction in light intensity, which triggered the onset of cercarial emergence, infected snails moved to the top of the water column and remained there for 2-3 h. Seventy-nine percent of all cercariae that emerged from the snail did so during this period. Uninfected snails showed no such behavioural changes following the change in light intensity. Cercariae were released in a dense cloud around the snail at the water surface and dispersed passively. Within 3-4 h more than 80% of all cercariae had settled in the bottom 5 cm of the water column. The infectivity of cercariae increased from less than 20% upon emergence from the snail to greater than 75% 4-6 h post-emergence, and then declined steadily to below 5% by 24 h post-emergence. Cercarial longevity was greater than 30 h and exceeded the period of infectivity. This may be related to steadily falling endogenous glycogen levels. A delay in attaining maximum infectivity may represent an adaptive mechanism allowing time for cercarial dissemination, thus reducing superinfection, and subsequent parasite-associated mortality, of second intermediate hosts.

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Free-living parasite infectious stages promote zooplankton abundance under the risk of predation

Schultz

Koprivnikar

2019

Oecologia

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The Effects of Various Light Regimens on the Emergence of Plagiorchis noblei Cercariae from the Molluscan Intermediate Host, Stagnicola elodes

Cited by 8 publications

References 0 publications

Photoperiodic cercarial emergence patterns of the digeneans Echinoparyphium recurvatum and Plagiorchis sp. from a mixed infection in Lymnaea peregra

Photoperiodic cercarial emergence patterns of the digeneans Echinoparyphium recurvatum and Plagiorchis sp. from a mixed infection in Lymnaea peregra

Plagiorchis elegans: emergence, longevity and infectivity of cercariae, and host behavioural modifications during cercarial emergence

Free-living parasite infectious stages promote zooplankton abundance under the risk of predation

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