title: Large and abundant flowers increase indirect costs of corollas: a study of coflowering sympatric Mediterranean species of contrasting flower size.
abstract: Large floral displays receive more pollinator visits but involve higher production and maintenance costs. This can result in indirect costs which may negatively affect functions like reproductive output. In this study, we explored the relationship between floral display and indirect costs in two pairs of coflowering sympatric Mediterranean Cistus of contrasting flower size. We hypothesized that: (1) corolla production entails direct costs in dry mass, N and P, (2) corollas entail significant indirect costs in terms of fruit set and seed production, (3) indirect costs increase with floral display, (4) indirect costs are greater in larger-flowered sympatric species, and (5) local climatic conditions influence indirect costs. We compared fruit set and seed production of petal-removed flowers and unmanipulated control flowers and evaluated the influence of mean flower number and mean flower size on relative fruit and seed gain of petal-removed and control flowers. Fruit set and seed production were significantly higher in petal-removed flowers in all the studied species. A positive relationship was found between relative fruit gain and mean individual flower size within species. In one pair of species, fruit gain was higher in the large-flowered species, as was the correlation between fruit gain and mean number of open flowers. In the other pair, the correlation between fruit gain and mean flower size was also higher in the large-flowered species. These results reveal that Mediterranean environments impose significant constraints on floral display, counteracting advantages of large flowers from the pollination point of view with increased indirect costs of such flowers.
authors: Universidad Rey Juan Carlos, Tulipán s/n, Móstoles, Madrid, Spain. alberto.teixido@urjc.es
authors: Alberto L
authors: AL
authors: Teixido
authors: Fernando
authors: F
authors: Valladares
mesh_terms: D029758:Cistus / Q000033:anatomy & histology / Q000254:growth & development / Q000502:physiology*; D035264:Flowers / Q000033:anatomy & histology / Q000254:growth & development / Q000502:physiology; D005638:Fruit / Q000033:anatomy & histology / Q000254:growth & development / Q000502:physiology; D019083:Mediterranean Region; D012098:Reproduction; D012639:Seeds / Q000033:anatomy & histology / Q000254:growth & development / Q000502:physiology
references: Proc Biol Sci. 2005 Dec 22;272(1581):2651-7
references: 16321788
references: Am Nat. 2000 Jul;156(1):72-83
references: 10824022
references: Oecologia. 2010 Aug;163(4):961-71
references: 20461411
references: J Evol Biol. 2010 Sep 1;23(9):1957-68
references: 20695967
references: Am J Bot. 2006 Apr;93(4):531-8
references: 21646213
references: Evolution. 1989 Jul;43(4):882-890
references: 28564200
references: Oecologia. 2001 Feb;126(3):386-394
references: 28547453
references: Oecologia. 1998 Nov;117(1-2):70-79
references: 28308508
references: Evolution. 2008 Jul;62(7):1751-63
references: 18419752
references: Ann Bot. 2008 Dec;102(6):1043-8
references: 18829587
references: Science. 1986 Jun 27;232(4758):1625-7
references: 17812141
references: Oecologia. 1985 May;66(2):299-306
references: 28311603
references: Oecologia. 1999 Mar;118(4):461-470
references: 28307414
references: Am J Bot. 2005 Feb;92(2):279-83
references: 21652405
references: J Exp Bot. 2010;61(2):335-45
references: 19854801
references: Oecologia. 2003 Sep;137(1):69-75
references: 12844252