title: Flowering phenology and reproductive fitness along a mountain slope: maladaptive responses to transplantation to a warmer climate in Campanula thyrsoides.
abstract: In many biomes, global warming has resulted in advanced and longer growing seasons, which has often led to earlier flowering in plant taxa. Elevational gradients are ideal to study the effects of global warming as they allow transplantation of plants from their original cooler higher elevations down to elevations with a prospective climate. We transplanted plants from ten populations of the European alpine monocarpic herb species Campanula thyrsoides L. to three sites along a steep mountain slope (600, 1,235 and 1,850 m above sea level) in the Swiss Alps and asked whether reproductive phenology adjusts plastically to elevation and if these responses were adaptive, i.e. increased the fitness of plants. We further assessed current genetic differentiation in phenotypic traits and whether any such origin effects were due to adaptation to climatic conditions of origin. Our results showed that transplantation to lower elevations caused strong shifts in phenology, with plants starting growth and flowering earlier than plants placed at higher elevations. However, compared to flower production at high elevation, number of flowers per plant decreased 21 % at mid- and 61 % at low elevation. The shift in phenology thus came with a high cost in fitness, and we suggest that phenology is maladaptive when C. thyrsoides faces temperature conditions deviating from its natural amplitude. We conclude that the frequently reported phenological shift in plant species as a response to global warming may include heavy fitness costs that may hamper species survival.
authors: Institute of Botany, University of Basel, Schönbeinstrasse 6, 4056 Basel, Switzerland. jofrsc@utu.fi
authors: J F
authors: JF
authors: Scheepens
authors: J
authors: J
authors: Stöcklin
mesh_terms: D000222:Adaptation, Physiological; D000531:Altitude; D029422:Campanulaceae / Q000254:growth & development*; D002980:Climate; D017753:Ecosystem; D035264:Flowers / Q000254:growth & development; D056084:Genetic Fitness; D057232:Global Warming; D012098:Reproduction / Q000502:physiology
references: Ecology. 2008 Feb;89(2):363-70
references: 18409426
references: Oecologia. 2010 Sep;164(1):141-50
references: 20461412
references: J Exp Bot. 2011 Jan;62(1):79-88
references: 20798000
references: Tree Physiol. 2012 Feb;32(2):161-70
references: 22345326
references: Science. 2002 May 31;296(5573):1689-91
references: 12040195
references: Nature. 2002 Mar 28;416(6879):389-95
references: 11919621
references: Am J Bot. 2004 Apr;91(4):531-9
references: 21653408
references: Oecologia. 2009 Mar;159(2):305-15
references: 19034526
references: Trends Ecol Evol. 2007 Aug;22(8):432-9
references: 17573151
references: Oecologia. 1983 Aug;59(1):135-40
references: 25024159
references: Ann Bot. 2012 Nov;110(7):1479-88
references: 22718086
references: Proc Natl Acad Sci U S A. 2007 Jan 2;104(1):198-202
references: 17182748
references: New Phytol. 2007;173(2):367-82
references: 17204083
references: Evolution. 2007 Oct;61(10):2419-32
references: 17711467
references: Heredity (Edinb). 2007 Dec;99(6):641-8
references: 17687248
references: Trends Ecol Evol. 2007 Jul;22(7):357-65
references: 17478009
references: Trends Plant Sci. 2000 Dec;5(12):537-42
references: 11120476
references: Trends Ecol Evol. 1991 Aug;6(8):246-9
references: 21232470
references: Evolution. 2007 Dec;61(12):2925-41
references: 17924954
references: Ecology. 2006 Mar;87(3):665-74
references: 16602296
references: New Phytol. 2005 Apr;166(1):49-60
references: 15760350
references: Am J Bot. 2007 Sep;94(9):1570-6
references: 21636522
references: Nature. 2011 Feb 24;470(7335):479-85
references: 21350480