The effects of computer-controlled shadow stimuli on the success of cercarial transmission by <i>Cryptocotyle lingua</i> (Digenea: Heterophyidae)

Rea, J. G.; Irwin, Sandra

doi:10.1017/s0031182000074163

Cited by 11 publications

(4 citation statements)

References 14 publications

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“…In this species, computer-controlled shadow stimuli of decreasing duration were found to increase the level of activity, whereas continuous shadowing decreases the intensity of the response. Shadow stimuli were found to increase significantly the number of infections achieved by the 12 h-old cercariae on experimental pectoral fins from juvenile rainbow trout (Rea & Irwin, 1991, 1992b.…”

Section: Possibility Of Other Selective Pressuresmentioning

confidence: 94%

Behaviours in trematode cercariae that enhance parasite transmission: patterns and processes

et al. 1994

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Cercariae, like miracidia, are non-parasitic larval stages implicated in the life cycle of all trematodes for the host-to-host parasite transmission. Almost all cercariae are free-living in the external environment. With a few exceptions (cercariae of Halipegus occidualis (Halipegidae) can live several months, Shostak & Esch, 1990a), cercariae have a short active life during which they do not feed, living on accumulated reserves. Most cercariae encyst as metacercariae in second intermediate hosts which are prey of the definitive host; in certain species, the interruption of the active life is achieved by an encystment in the external environment (or a simple immobile waiting strategy in a few species). In some two-host life cycles, the cercariae develop into adults after penetration (this is the case for various species causing human schistosomiasis). Some cercariae do not leave the mollusc which must then be ingested by the definitive host.

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Section: Possibility Of Other Selective Pressuresmentioning

confidence: 94%

Behaviours in trematode cercariae that enhance parasite transmission: patterns and processes

et al. 1994

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“…Other cercariae respond directly to stimuli created by potential hosts. For example, Cryptocotyle lingua cercariae significantly increase activity in response to a passing shadow, thus enhancing transmission to excised pectoral fins designed to mimic a fish host (Rea andIrwin, 1991, 1992) and Schistosoma mansoni and Schistosoma haematobium cercariae respond to different chemical and thermal host cues and display different swimming behaviors (Haas et al, 1994). These differences were considered to represent adaptations to the disparate environmental conditions under which these 2 species of schistosome cercariae encounter their hosts.…”

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confidence: 99%

Behavioral Basis of Second Intermediate Host Specificity among Four Species of Haematoloechus (Digenea: Haematoloechidae)

Snyder¹,

Janovy²

1996

The Journal of Parasitology

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“…The start of swimming in response to mainly short duration dark stimuli might, for example, be related to signals from predators such as cladocerans and its function could be to escape predation. On the other hand, the infection success of C. lingua cercariae to isolated fish fins was increased when the cercariae were exposed to sequences of shadow stimuli (Rea & Irwin, 19926). However, it is not known whether this was achieved directly by shadow-stimulated attachments or by changed vertical distribution of the parasites.…”

Section: Dark Stimulimentioning

confidence: 99%

Physiological analyses of host-finding behaviour in trematode cercariae: adaptations for transmission success

Haas

1994

Parasitology

121

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Physiological analyses of the behaviour of several cercarial species which actively find and invade their hosts have revealed very complex sequences of behaviour patterns and responses to very different stimuli from the environment and the host. A result of these physiological studies is that the behaviour patterns of each of the species investigated are surprisingly individual. The behavioural patterns of host-finding of those species analysed in some detail reveal profound adaptations to maximize transmission success. This can be demonstrated for movement patterns during swimming, for responses to environmental conditions such as gravity, light and temperature, for responses to stimuli emanating from the host such as shadows, water turbulence and chemical compounds and especially for the responses after contact with the host. The behaviour patterns can be interpreted as adaptations to: (1) dispersal by leaving the habitat of the snail intermediate host and distribution within the area; (2) long survival by energy saving swimming behaviour, by avoiding responses to inappropriate stimuli, by selecting favourable microhabitats and probably by avoiding predation; (3) finding and invading particular host types by selecting microhabitats frequented by the hosts and responding to sequences of specific stimuli emanating from the hosts.

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The effects of computer-controlled shadow stimuli on the success of cercarial transmission by Cryptocotyle lingua (Digenea: Heterophyidae)

Cited by 11 publications

References 14 publications

Behaviours in trematode cercariae that enhance parasite transmission: patterns and processes

Behaviours in trematode cercariae that enhance parasite transmission: patterns and processes

Behavioral Basis of Second Intermediate Host Specificity among Four Species of Haematoloechus (Digenea: Haematoloechidae)

Physiological analyses of host-finding behaviour in trematode cercariae: adaptations for transmission success

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