| Title: | The evolution of floral signals in relation to range overlap in a clade of California Jewelflowers (Streptanthus s.l.) |
| Author(s): | Weber MG; Cacho NI; Phan MJQ; Disbrow C; Ramirez SR; Strauss SY; |
| Address: | "Center for Population Biology, University of California, Davis, California 95616. Current Address: Department of Plant Biology and Ecology, Evolutionary Biology and Behavior Program, Michigan State University, East Lansing, Michigan 48823. Instituto de Biologia, Universidad Nacional Autonoma de Mexico, CDMX 04510, Mexico. Department of Evolution and Ecology, University of California, Davis, California 95616" |
| ISSN/ISBN: | 1558-5646 (Electronic) 0014-3820 (Linking) |
| 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, sustained role in mediating speciation and coexistence dynamics across this group, and that signatures of these dynamics may persist at the macroevolutionary scale" |
| Keywords: | *Biological Evolution Brassicaceae/*physiology California *Cues Flowers/*physiology *Genetic Speciation Odorants/analysis Pollination Sympatry/physiology Coexistence contemporary and historical approaches floral scent heterospecific pollen transfer phylog; |
| Notes: | "MedlineWeber, Marjorie G Cacho, N Ivalu Phan, Martin J Q Disbrow, Caprice Ramirez, Santiago R Strauss, Sharon Y eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2018/02/22 Evolution. 2018 Apr; 72(4):798-807. doi: 10.1111/evo.13456. Epub 2018 Mar 30" |
