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          Institute: MPI für Evolutionsbiologie     Collection: Evolutionary ecology     Display Documents

ID: 173955.0, MPI für Evolutionsbiologie / Evolutionary ecology
Heredity of specific host-finding behaviour in Schistosoma mansoni miracidia
Authors:Kalbe, M.; Haberl, B.; Hertel, J.; Haas, W.
Date of Publication (YYYY-MM-DD):2004-06
Title of Journal:Parasitology
Issue / Number:6
Start Page:635
End Page:643
Review Status:not specified
Audience:Not Specified
Abstract / Description:Two strains of Schistosoma mansoni were used to investigate the hereditary basis of species-specific host recognition by analysing behavioural responses of miracidia to snail-conditioned water. An Egyptian strain of S. mansoni, capable of distinguishing its host snail Biomphalaria alexandrina from other snails was cycled repeatedly through Biomphalaria glabrata, the intermediate host of a Brazilian strain known to respond even to non-susceptible snails with high intensity. After 5 cycles in the non-natural host, miracidia of the Egyptian strain still retained their preference for the original host snail. In a second experiment, host-finding behaviour of hybrids between these two parasite strains was studied. In the F1 generation, hybrids of both parental combinations showed the same low degree of specificity as the pure-bred Brazilian strain. Approximately one quarter of F2 hybrids proved to be as discriminatory as the Egyptian strain, confirming dominant Mendelian inheritance of non-specificity in schistosome miracidial host-finding behaviour. Moreover, hybrids seem to have lost the ability to develop in B. alexandrina, possibly suggesting a link between host recognition and host compatibility. The heredity of this behavioural trait is of evolutionary and epidemiological significance, since a shift to low host-finding specificity might have been a prerequisite for S. mansoni to acquire new host snails after being introduced to South America by the slave trade
Free Keywords:Schistosoma mansoni; miracidia; host-finding behaviour; hybrids; species-specificity; adaptation
External Publication Status:published
Document Type:Article
Affiliations:MPI für Limnologie/Abt. Evolutionsökologie
External Affiliations:Institute for Zoology I, University of Erlangen, Staudtstrasse 5, 91058 Erlangen, Germany
Identifiers:ISSN:0031-1820 [ID-No:1]
DOI:10.1017/S0031182004005037 [ID-No:2]
LOCALID:2289/S 38164 [Listen-Nummer/S-Nummer]
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