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the defences of their hosts and deal with competitors for limited resources
within the molluscan host, actions that structure trematode communities
in accordance with dominance hierarchies based on size and aggressive
(redial) morphology.

Acknowledgements

My appreciation to Todd Huspeni, Nick Kalodimos and Karen Miller for
assistance in preparing the manuscript. Mike Sukhdeo and Ed Lewis
provided valuable comments on an earlier draft of the manuscript.
Finally, thanks to Armand Kuris for getting me interested in trematodes
and Sam Loker and his colleagues for doing all the hard work on the IDS
that helped me to make sense of everything.

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164 K.D. Lafferty

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