Snail odour-clouds: spreading and contribution to the transmission success of Trichobilharzia ocellata (Trematoda, Digenea) miracidia

Oecologia
J HertelWilfried Haas

Abstract

Chemical communication among freshwater organisms is an adaptation to improve their coexistence. Here,we focus on the chemical cues secreted by the freshwater gastropod Lymnaea stagnalis, which are known to stimulate behavioural responses of Trichobilharzia ocellata (Plathelminthes, Digenea, Trematoda) miracidia. Such responses are commonly claimed to influence transmission positively, but in response to chemical cues miracidia randomly change their swimming direction. This kind of response does not necessarily increase transmission, because miracidia may be trapped at the periphery of very large snail odour-clouds, which may prevent them from approaching the snail. On the other hand, the odour clouds may be too small to improve host-localisation. To shed light on these scenarios, the spreading of molecules released around L. stagnalis (active space) was visualised by recording host-finding responses of T. ocellata miracidia when they approached snails. Behavioural responses of miracidia indicated the spreading of compounds forming an attractive active space only around the host-snail L. stagnalis, but not around sympatric non-host-snail species. The active space increased approximately linearly with the time the snail rested a...Continue Reading

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Citations

Oct 17, 2008·Journal of Helminthology·F AllanA M Dunn
Jun 26, 2008·The Journal of Parasitology·Wilfried HaasChristina Loy
Jan 12, 2013·Trends in Parasitology·Miroslava SoldánováBernd Sures
Aug 28, 2012·Trends in Parasitology·Keely E Chaisson, Elissa A Hallem
Apr 23, 2015·International Journal of Hygiene and Environmental Health·Christian SelbachBernd Sures
Jun 13, 2016·Zoology : Analysis of Complex Systems, ZACS·Jörn P ScharsackMartin Kalbe
Jan 9, 2015·Clinical Microbiology Reviews·Petr HorákSara Vanessa Brant

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