Pollinator Assemblages and Visitation Rates for 11 Species of Neotropical Costus (Costaceae)

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Ecology of plant speciation (2010, background): “All seven of the pollinator shifts in Neotropical Costus involve a transition from orchid bees to hummingbirds, consistent with the pattern seen in Aquilegia.”
Pollination Syndromes and Floral Specialization (2004, background): “Attempts to describe adaptive landscapes in floral evolution, measuring patterns of inter- and intra-specific variation, have demonstrated that certain combinations of traits, including the amount of reward, flower size, and placement of the male and female reproductive structures relative…”
Long Tongues and Loose Niches: Evolution of Euglossine Bees and Their Nectar Flowers 1 (2005, background): “Although nectar flowers visited by euglossine bees fall into a well-defined euglossine syndrome (Kennedy 1978, Ackerman 1985, Kay & Schemske 2003, Roubik & Hanson 2004), few of these plants actually seem to be specialized on a single species of bee.”
Evaluation of pollination syndromes in Antillean Gesneriaceae: evidence for bat, hummingbird and generalized flowers (2009, background): “…the Gesneriaceae (tubular, red or yellow diurnal flowers with dilute nectar), one of the most widespread and accepted patterns of floral convergence (e.g. Sakai et al. 1999; Kay & Schemske 2003; Hargreaves et al. 2004; Sanmartin-Gajardo & Sazima 2005a; Wilson et al. 2006; Whittall & Hodges 2007).”