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  Host-finding in Echinostoma caproni: miracidia and cercariae use different signals to identify the same snail species.

Haberl, B., Körner, M., Spengler, Y., Hertel, J., Kalbe, M., & Haas, W. (2000). Host-finding in Echinostoma caproni: miracidia and cercariae use different signals to identify the same snail species. Parasitology, 120(5), 479-486.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DFA5-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DFA6-E
Genre: Journal Article

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Haberl_2000.pdf (Publisher version), 582KB
 
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 Creators:
Haberl, B., Author
Körner, M., Author
Spengler, Y., Author
Hertel, J., Author
Kalbe, M.1, 2, Author              
Haas, W., Author
Affiliations:
1Department Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445634              
2Research Group Parasitology, Department Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445643              

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Free keywords: host-finding; Echinostoma caproni; miracidia; cercariae; snail host; chemo-orientation
 Abstract: The snail host signals releasing host-finding responses in miracidia and cercariae of Echinostoma caproni were analysed by fractionation of snail-conditioned water (SCW). Cercariae responded non-specifically to organic and hydrophilic, low molecular weight components of SCW showing their typical turning response. Hydrolysis of peptides in SCW had no effect on cercarial responses. An artificial mixture of amino acids in concentrations determined from SCW as well as glycine alone in a concentration corresponding to the total concentration of amino acids in SCW showed nearly the same efficacy as SCW itself. Miracidia responded to a high molecular weight glycoprotein fraction, which could be isolated from SCW by ion-exchange and size-exclusion chromatography. In contrast to an Egyptian Schistosoma mansoni strain, the echinostome miracidia were not able to differentiate between different snail species. The results show for the first time that miracidia and cercariae of the same species may use different signals to identify the same snail host species. This indicates an independent evolution of host-finding mechanisms in the two parasite stages.

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Language(s): eng - English
 Dates: 2000-05
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 119274
Other: 1933/S 37592
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Title: Parasitology
Source Genre: Journal
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Pages: - Volume / Issue: 120 (5) Sequence Number: - Start / End Page: 479 - 486 Identifier: ISSN: 0031-1820