Sigurd Einum

TL;DR: The hypothesis that selection on juvenile traits may play an important role in the evolution of maternal traits in natural populations is supported, and egg size had fitness consequences independent of the effects of emergence time that directly affected body size at emergence and, in turn, survival and size at later life stages.

TL;DR: The results provide the first direct evidence for a causal relationship between egg size and fitness-related traits in fishes, independent of potentially confounding genetic effects, and indicate that previous studies have been biased by experimental conditions that excluded competitive asymmetries and environmental variability.

TL;DR: It is argued that acting as if populations are not locally adapted carries a much greater risk of mismanagement than acting under the assumption for local adaptations when there are none, and an evolutionary approach to salmon conservation is required.

TL;DR: It is concluded that maximization of maternal fitness by sacrificing offspring survival may well be a general phenomenon among highly fecund organisms.

TL;DR: The results suggest that innate differences in behaviour and growth, that probably are linked closely to fitness, will threaten native populations through competition and disruption of local adaptations.