The evolution of floral signals in relation to range overlap in a clade of California Jewelflowers (Streptanthus s.l.)

Evolution; International Journal of Organic Evolution
Marjorie G WeberSharon Y Strauss

Abstract

Because of their function as reproductive signals in plants, floral traits experience distinct selective pressures related to their role in speciation, reinforcement, and prolonged coexistence with close relatives. However, few studies have investigated whether population-level processes translate into detectable signatures at the macroevolutionary scale. Here, we ask whether patterns of floral trait evolution and range overlap across a clade of California Jewelflowers reflect processes hypothesized to shape floral signal differentiation at the population level. We found a pattern of divergence in floral scent composition across the clade such that close relatives had highly disparate floral scents given their age. Accounting for range overlap with close relatives explained additional variation in floral scent over time, with sympatric species pairs having diverged more than allopatric species pairs given their age. However, three other floral traits (flower size, scent complexity and flower color) did not fit these patterns, failing to deviate from a null Brownian motion model of evolution. Together, our results suggest that selection for divergence among close relatives in the composition of floral scents may play a key, sust...Continue Reading

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Citations

Feb 16, 2019·Proceedings of the National Academy of Sciences of the United States of America·Magne FribergJohn N Thompson
Jul 14, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Jenn M Coughlan, Daniel R Matute
Apr 11, 2019·Journal of Evolutionary Biology·Luke J HarmonBlake Matthews
Jan 19, 2021·The New Phytologist·Sonal SinghalFelipe Zapata
Feb 5, 2021·Journal of Experimental Botany·Marion Orsucci, Adrien Sicard
May 18, 2021·Evolution; International Journal of Organic Evolution·Zachary B HancockGideon S Bradburd

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