The Hydrobia ulvae–Maritrema subdolum association: influence of temperature, salinity, light, water-pressure and secondary host exudates on cercarial emergence and longevity

• DOI: 10.1079/joh2002136
• Publication Date: 2003-02-26T17:47:22Z
• Authors: K.N. Mouritsen
• Keywords: Temperature salinity diagrams

Abstract The effects of environmental factors and exudates from the amphipod Corophium volutator on emergence Maritrema subdolum cercariae (Digenea: Microphallidae) snail Hydrobia ulvae were investigated in laboratory. Increasing temperature (15 to 25°C) caused an overall 11-fold increase rate under varying salinities (24 36‰). effect salinity depended experimental temperature. Emergence increased with increasing at higher temperatures, but decreased 15°C.Whereas different levels had no effect, significantly reduced life span cercariae. In comparison complete darkness, light a two-fold emergence, whereas increment water pressure 1.0 1.3 ATM (corresponding 0 3 m depth) left shedding unaffected. Unidentified second intermediate host, C. , depressed cercarial rate. main transmission window M. seems occur during low tidal pools where are high solar radiation rapidly elevates temperature, as well through evaporation. consequence such strategy is discussed relation impact population dynamics host.