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A multifactorial design for choice experiments is mathematically defined, and has been applied to study the comb~ned effects of temperature and salinity on behav~oural responses of Corophium volutator (Pallas). The behav~oural responses used were preferences and ac t~vi ty in twochoice experiments. Twenty-six combinations of low (suboptimal, non-preferred), optimal, and high (supraoptimal, non-preferred) levels of each variable were tested in 3 experimental series: (1 ) Constant salinity with temperature choice; (2) constant temperature with salinity choice; (3) temperature and salinity choice. Optimal salinity was preferred to low or high salinities at each temperature. Optimal temperature was always preferred to low temperature at each sa l in~ty , but this was not tl-ue when the optimal temperature was offered with the high temperatul-e. Temperature preferences ovel-lode s a l ~ n ~ t y preferences when both varied. Overall, temperature and salinity d i sc r~m~na t ion did not differ, but temperature discrimination decreased with increasing salinity while s a l~n i ty discrimination was unaffected by temperature. Complex interactions occurred between temperature and salinity, in relation to their influence on activity. Temperature influenced activity when held constant dt different levels, but not when offerrd as a choice. In general , total activity was lower in the preferred choice. Theoretical and practical aspects of the experimental design are discussed. Attent~on I S drawn to the ecological significance of the results in relatlon to indirect and direct behavioural responses to environmental parameters, to possible behavioural and physiological differences between winter and summer populations, and to zoogeographical distributions of species.

Multifactorial Analysis of Behavioural Responses of the Amphipod Corophium volutator to Temperature-Salinity Combinations