TY - JOUR
T1 - Fast and cheap in the fall
T2 - Phylogenetic determinants of late flowering phenologies in himalayan Rhododendron
AU - Hart, Robbie
AU - Georgian, Elizabeth M.
AU - Salick, Jan
N1 - Publisher Copyright:
© 2016 Botanical Society of America.
PY - 2016/2/1
Y1 - 2016/2/1
N2 - PREMISE OF THE STUDY: Biotic and abiotic pressures affect the beginning and end of phenologies differently, but little is known about how these temporal components may be determined by phylogeny. We tested for phylogenetic signal in the phenological components and related traits among Himalayan Rhododendron species. METHODS: We constructed a phylogeny with trnL-trnL-trnF, atpH-I, RPB2-I (3F-4R), and ITS 4-5, and examined it in combination with trait data recorded for a nine-species assemblage on Mt. Yulong, Yunnan, China. KEY RESULTS: Uniquely among phenological traits, ‘last flowering day’ had a significant phylogenetic signal. Last flowering day was latest in the clade with the smallest fruits. A similar association between the end of flowering and reproductive investment existed in data from Flora of China (Wu et al., 2005) for 160 Yunnan Rhododendron species, for which last flowering month was correlated with fruit size. CONCLUSIONS: Phylogenetic determinants of last flowering day and fruit size may be driven by limited time for fruit development before the onset of cold temperatures in autumn—a temporal niche that only small-fruited species can occupy. This strategy is analogous to ‘fast and cheap’ spring ephemerals. More may be gained from late-phenology studies, both within and among species and across seasons.
AB - PREMISE OF THE STUDY: Biotic and abiotic pressures affect the beginning and end of phenologies differently, but little is known about how these temporal components may be determined by phylogeny. We tested for phylogenetic signal in the phenological components and related traits among Himalayan Rhododendron species. METHODS: We constructed a phylogeny with trnL-trnL-trnF, atpH-I, RPB2-I (3F-4R), and ITS 4-5, and examined it in combination with trait data recorded for a nine-species assemblage on Mt. Yulong, Yunnan, China. KEY RESULTS: Uniquely among phenological traits, ‘last flowering day’ had a significant phylogenetic signal. Last flowering day was latest in the clade with the smallest fruits. A similar association between the end of flowering and reproductive investment existed in data from Flora of China (Wu et al., 2005) for 160 Yunnan Rhododendron species, for which last flowering month was correlated with fruit size. CONCLUSIONS: Phylogenetic determinants of last flowering day and fruit size may be driven by limited time for fruit development before the onset of cold temperatures in autumn—a temporal niche that only small-fruited species can occupy. This strategy is analogous to ‘fast and cheap’ spring ephemerals. More may be gained from late-phenology studies, both within and among species and across seasons.
KW - Climate change
KW - Himalaya
KW - Life-history
KW - Phenology
KW - Phylogeny
KW - Rhododendron
UR - http://www.scopus.com/inward/record.url?scp=84959120460&partnerID=8YFLogxK
U2 - 10.3732/ajb.1500440
DO - 10.3732/ajb.1500440
M3 - Article
C2 - 26851266
AN - SCOPUS:84959120460
SN - 0002-9122
VL - 103
SP - 198
EP - 206
JO - American Journal of Botany
JF - American Journal of Botany
IS - 2
ER -