caa a22 4500 606193421 CHVBK 20210128100909.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s10682-014-9736-5 doi (NATIONALLICENCE)springer-10.1007/s10682-014-9736-5 Long corollas as nectar barriers in Lonicera implexa [Elektronische Daten] interactions between corolla tube length and nectar volume [Amparo Lázaro, Clara Vignolo, Luis Santamaría] Long corollas are a classical example of nectar barriers, because they prevent undesired visitors from consuming the reward intended for more effective pollinators. As the investment in nectar barriers increases, flower attractiveness and nectar rewards may also increase to maintain loyal visitation of most effective pollinators; and flowers may become more prone to nectar robbing. We evaluated the effect of nectar barriers (corolla tube length), two related traits (nectar volume and upper lip size) and the associated risk of nectar robbing, on the fecundity of Lonicera implexa plants from three populations differing in the abundance of its most efficient pollinator, the hummingbird hawkmoth Macroglossum stellatarum. Corolla tube length varied most among individuals within populations (45-46% of total variance) and inflorescences within individuals (23-32%), and showed little variation among populations (0.2-11%). Longer corolla tubes were always associated with larger nectar volumes and larger upper lips, although the strength of the relationships varied across populations and years. Robbing frequency increased with corolla tube length, decreased with nectar volume and upper lip size, and its weak effects on fecundity were predominantly positive. Plant fecundity peaked at two different optima: long corollas with little nectar and short corollas with abundant nectar. However, the exact shape of the interaction between corolla length and nectar volume, as well as the combination of traits showing the highest fecundity, differed between populations and years. This variation could be explained by among-population differences in pollinator assemblages, and inter-annual changes in resources dedicated to reproduction. Our study shows that large nectar volumes can modulate the effect of corolla length as a nectar barrier, and that the combination of these two traits that maximises fecundity may be related to the identity of pollinators within each population. Springer International Publishing Switzerland, 2014 Corolla tube length nationallicence Fecundity nationallicence Floral display nationallicence Nectar robbing nationallicence Nectar volume nationallicence Non-additive effects nationallicence Selective pressures nationallicence Lázaro Amparo Mediterranean Institute for Advanced Studies (IMEDEA), UIB-CSIC, C/Miquel Marqués 21, 07190, Esporles, Balearic Islands, Spain aut Vignolo Clara Mediterranean Institute for Advanced Studies (IMEDEA), UIB-CSIC, C/Miquel Marqués 21, 07190, Esporles, Balearic Islands, Spain aut Santamaría Luis Doñana Biological Station, C/Americo Vespucio s/n, Isla de la Cartuja, 41092, Seville, Spain aut Evolutionary Ecology Springer International Publishing 29/3(2015-05-01), 419-435 0269-7653 29:3<419 2015 29 10682 https://doi.org/10.1007/s10682-014-9736-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10682-014-9736-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lázaro Amparo Mediterranean Institute for Advanced Studies (IMEDEA), UIB-CSIC, C/Miquel Marqués 21, 07190, Esporles, Balearic Islands, Spain aut NATIONALLICENCE 700 1- Vignolo Clara Mediterranean Institute for Advanced Studies (IMEDEA), UIB-CSIC, C/Miquel Marqués 21, 07190, Esporles, Balearic Islands, Spain aut NATIONALLICENCE 700 1- Santamaría Luis Doñana Biological Station, C/Americo Vespucio s/n, Isla de la Cartuja, 41092, Seville, Spain aut NATIONALLICENCE 773 0- Evolutionary Ecology Springer International Publishing 29/3(2015-05-01), 419-435 0269-7653 29:3<419 2015 29 10682