Keynote talk: Flower phenotypic selection by oil-collecting bees and birds in an hybrid swarm between Calceolaria uniflora and C. polyrhiza

COCUCCI, A. A.; ESTEVEZ MANSO, L.; IBÁÑEZ, A. C.; SÉRSIC, A. N.

Salzburgo

Conferencia; 3rd International Symposium in memory of Stefan Vogel; 2021

Paris London Universität Salzburg

Selection of flower phenotype by oil-collecting bees and birds in anhybrid zone between Calceolaria uniflora and C. polyrihiza.Cocucci Andrea,Estévez Lucía, Ibáñez Ana, Sérsic Alicia.When Stefan Vogelin full brought into light his discovery in pollination ecology ofplants bearing oil producing flowers and their association with oilcollecting bees, he revealed among many other surprises thatslipper-flowers (Calceolaria) counted largely among suchoil-flowers. There he also remarkably and rightly predicted that onespecies, C. uniflora, bearing a markedly deviating flowerphenotype lacked the otherwise regularly occurring oil gland andinstead the corolla flap that should carry the gland was transformedinto a fleshy food body. How such an unparalleled as well as strikingevolutionary shift between oil bearing oil bee pollinated species andoil-less bird pollinated species may have taken place has remained amystery so far.Where C.uniflora and the oil bee pollinated C. polyrhiza buildswarms attributable to introgresive hybridization we could perform aphenotypic selection analysis by measuring morphological variationusing among other geometric morphometric tools and recordingvisitation by both oil-collecting bees and flower pecking birds.Results showed a significant pattern of disruptive selection onseveral dimensions of flower phenotype and that birds are the mostlikely responsible asymmetric pollen transference among parentalspecies.p { line-height: 115%; margin-bottom: 0.25cm; background: transparent }