Water boatman survival and fecundity are related to ectoparasitism and salinity stress.

Association between mite infection and larval mortality None of the parasitized larvae (n = 60) reached the adult stage, compared to 43.1% of unparasitized larvae (n = 130), a highly significant difference (Fisher exact, P < 0.001).

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The interaction infection status x salinity was marginally significant, reflecting a trend towards greater mortality in parasitised corixids at higher salinities ( S4 Table ).

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