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suggesting ontogenetic shifts in habitat use by juvenile M trossulusare a response to changing sensitivity to desiccation If so, the future survival of newly settled mussels, and thus possibly the
potential for ontogenetic change in trait-mediated interactions with neighbors While ontogenetic shifts have often been studied in the context of trophic communities, there is much less known about the role of ontogenetic niche shifts in communities of species at the same trophic level (Miller and Rudolf 2011) Published demographic studies of
potential yield under stress is not the best indicator for drought resistance (Simane & Struik, 1993) Yield stability, the extent of variation in yield be-tween stress and non-stress conditions, is widely ac-cepted as a better indicator for genotypic response to stress (Fischer & Maurer, 1978; Blum, 1988; Blum et al , 1989)