15. The Oscillation Hypothesis Of Host-Plant Range And Speciation

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Closely related pollen generalist bees differ in their ability to develop on the same pollen diet: evidence for physiological adaptations to digest pollen (2011, background): “…as the widespread specialization to a few closely related hosts, the occurrence of periods of expanded host range followed by respecialization, or the phylogenetically conserved host associations, display striking similarities to those of herbivorous insects (Janz & Nylin 2008; Sedivy et al. 2008).”
The generalism-specialism debate: the role of generalists in the life and death of species (2011, background): “This argument implies that there are many greater opportunities through generalism (than there are from specialism) for clade furcation and thus for species with specialisms (Janz, Nylin & Wahlberg, 2006; Janz & Nylin, 2008).”
Niche Breadth: Causes and Consequences for Ecology, Evolution, and Conservation (2020, background): “The oscillation hypothesis ( Janz and Nylin 2008) suggests that lineages fluctuate between specialization and generalization over evolutionary time (analogous to Figure 1.a.ii).”
Niche breadth predicts geographical range size: a general ecological pattern. (2013, background): “For example, Janz & Nylin (2008) suggested that diversification among herbivorous insects is driven by alternating evolutionary periods of dietary generalisation (associated with range expansion) and specialisation (associated with local adaptation to new hosts).”