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Limited impact of irrigation on the phenology of Brachychiton megaphyllus: a deciduous shrub that flowers while leafless during the tropical dry season

Published online by Cambridge University Press:  29 July 2015

Patricia J. Bate  and
Donald C. Franklin
Patricia J. Bate*
Affiliation:
Northern Territory Medical Program, FlindersNT, c/- Charles Darwin University, Darwin NT 0909, Australia
Donald C. Franklin
Affiliation:
Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin NT 0909, Australia
*
1Corresponding author. Email: [email protected]
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Abstract:

A suite of woody plants inhabiting the seasonally dry tropics flower while leafless during the dry season, raising intriguing questions about the role of moisture limitation in shaping their phenology. Brachychiton megaphyllus is one such species, a shrub of open forests and savannas in northern Australia. We documented leaf and reproductive phenology of 14 shrubs, and irrigated a further 15, to determine if soil moisture affected leafiness and reproductive activity. Brachychiton megaphyllus showed first flower buds shortly after the cessation of wet-season rains, and budded and flowered throughout the dry season. In some plants, leaf flush occurred prior to the first rains. Rates of fruit set and maturity were very low. Irrigation did not significantly influence leaf shoot or subsequent canopy development. Contrary to expectation, irrigation decreased the production of buds and flowers though it had no impact on the production of fruit, a response for which we suggest a number of hypotheses. Phenological responses to irrigation may have been limited because B. megaphyllus responds primarily to cues other than soil moisture and is buffered against seasonal drought by a large tap root. This suggests mechanisms by which flowering while leafless may occur in a range of species.

Keywords

deciduousnessdry-season floweringmonsoonal tropicsplantssoil moisturewet-dry tropics
Type
Research Article
Information
Journal of Tropical Ecology , Volume 31 , Issue 5 , September 2015 , pp. 459 - 467
Copyright
Copyright © Cambridge University Press 2015 

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References

LITERATURE CITED

ANDERSON, M. J., GORLEY, R. N. & CLARKE, K. R. 2008. PERMANOVA+ for PRIMER: guide to software and statistical methods. PRIMER-E, Plymouth. 214 pp.Google Scholar
BORCHERT, R. 1983. Phenology and control of flowering in tropical trees. Biotropica 15:81–89.CrossRefGoogle Scholar
BORCHERT, R. 1991. Growth periodicity and dormancy. Pp. 221–245 in Raghvendra, A. S. (ed.). Physiology of trees. John Wiley & Sons, New York.Google Scholar
BORCHERT, R. 1994a. Soil and stem water storage determine phenology and distribution of tropical dry forest trees. Ecology 75:1437–1449.CrossRefGoogle Scholar
BORCHERT, R. 1994b. Water status and development of tropical trees during seasonal drought. Trees – Structure and Function 8:115–125.CrossRefGoogle Scholar
BORCHERT, R. & RIVERA, G. 2001. Photoperiodic control of seasonal development and dormancy in tropical stem-succulent trees. Tree Physiology 21:213–221.CrossRefGoogle ScholarPubMed
BORCHERT, R., MEYER, S. A., FELGER, R. S. & PORTER-BOLLAND, L. 2004. Environmental control of flowering periodicity in Costa Rican and Mexican tropical dry forests. Global Ecology and Biogeography 13:409–425.CrossRefGoogle Scholar
BOWMAN, D. M. J. S. & PRIOR, L. D. 2005. Turner Review No. 10. Why do evergreen trees dominate the Australian seasonal tropics? Australian Journal of Botany 53:379–399.CrossRefGoogle Scholar
BUIST, M., YATES, C. J. & LADD, P. G. 2000. Ecological characteristics of Brachychiton populneus (Sterculiaceae) (kurrajong) in relation to the invasion of urban bushland in south-western Australia. Austral Ecology 25:487–496.CrossRefGoogle Scholar
BULLOCK, S. H. & SOLIS-MAGALLANES, J. A. 1990. Phenology of canopy trees of a tropical deciduous forest in Mexico. Biotropica 22:22–35.CrossRefGoogle Scholar
CHOAT, B., BALL, M. C., LULY, J. G. & HOLTUM, J. A. M. 2005. Hydraulic architecture of deciduous and evergreen dry rainforest tree species from north-eastern Australia. Trees – Structure and Function 19:305–331.CrossRefGoogle Scholar
CHOAT, B., BALL, M. C., LULY, J. G., DONNELLY, C. F. & HOLTUM, J. A. M. 2006. Seasonal patterns of leaf gas exchange and water relations in dry rain forest trees of contrasting leaf phenology. Tree Physiology 26:657–664.CrossRefGoogle ScholarPubMed
DUFF, G. A., MYERS, B. A., WILLIAMS, R. J., EAMUS, D., O’GRADY, A. & FORDYCE, I. R. 1997. Seasonal patterns in soil moisture, vapour pressure deficit, tree canopy cover and pre-dawn water potential in a northern Australian savanna. Australian Journal of Botany 45:211–224.CrossRefGoogle Scholar
EAMUS, D., CHEN, X., KELLEY, G. & HUTLEY, L. B. 2002. Root biomass and root fractal analyses of an open Eucalyptus forest in a savanna of north Australia. Australian Journal of Botany 51:31–41.CrossRefGoogle Scholar
FALLAS-CEDENO, L., HOLBROOK, N. M., ROCHA, O. J., VASQUEZ, N. & GUTIERREZ-SOTO, M. V. 2010. Phenology, lignotubers, and water relations of Cochlospermum vitifolium, a pioneer tropical dry forest tree in Costa Rica. Biotropica 42:104–111.CrossRefGoogle Scholar
FRANKLIN, D. C. & BATE, P. J. 2013. Brachychiton megaphyllus, the Red-flowered Kurrajong. Northern Territory Naturalist 24:81–88.CrossRefGoogle Scholar
FRANKLIN, D. C. & NOSKE, R. A. 2000. Nectar sources used by birds in monsoonal north-western Australia: a regional survey. Australian Journal of Botany 48:461–474.CrossRefGoogle Scholar
GARNETT, S. T. & WILLIAMSON, G. 2010. Spatial and temporal variation in precipitation at the start of the rainy season in tropical Australia. Rangeland Journal 32:215–226.CrossRefGoogle Scholar
GUYMER, G. P. 1988. A taxonomic revision of Brachychiton (Sterculiaceae). Australian Systematic Botany 1:199–323.CrossRefGoogle Scholar
HUNTLEY, B. J. & WALKER, B. H. (eds.) 1982. Ecology of tropical savannas. Springer-Verlag, New York. 660 pp.CrossRefGoogle Scholar
JANOS, D. P., SCOTT, J. & BOWMAN, D. M. J. S. 2008. Temporal and spatial variation of fine roots in a northern Australian Eucalyptus tetrodonta savanna. Journal of Tropical Ecology 24:177–188.CrossRefGoogle Scholar
JANZEN, D. H. 1967. Synchronization of sexual reproduction of trees within the dry season in Central America. Evolution 21:620–637.CrossRefGoogle ScholarPubMed
MCDONALD, N. S. & MCALPINE, J. 1991. Floods and droughts: the northern climate. Pp. 19–29 in Haynes, C. D., Ridpath, M. G. & Williams, M. A. J. (eds.). Monsoonal Australia. Landscape, ecology and man in the northern lowlands. A.A. Balkema, Rotterdam.Google Scholar
MURPHY, P. G. & LUGO, A. E. 1986. Ecology of tropical dry forest. Annual Review of Ecology and Systematics 17:67–88.CrossRefGoogle Scholar
MYERS, B. A., WILLIAMS, R. J., FORDYCE, I., DUFF, G. A. & EAMUS, D. 1998. Does irrigation affect leaf phenology in deciduous and evergreen trees of the savannas of northern Australia? Australian Journal of Ecology 23:329–339.CrossRefGoogle Scholar
REICH, P. B. & BORCHERT, R. 1984. Water stress and tree phenology in a tropical dry forest in the lowlands of Costa Rica. Journal of Ecology 72:61–74.CrossRefGoogle Scholar
RIVERA, G. & BORCHERT, R. 2001. Induction of flowering in tropical trees by a 30-min reduction in photoperiod: evidence from field observations and herbarium specimens. Tree Physiology 21:201–212.CrossRefGoogle ScholarPubMed
RIVERA, J. & COZZA, J. 2008. Reduced photoperiod induces partially synchronous flowering in an understory rain forest herb, Begonia urophylla in Costa Rica. Biotropica 40:363–365.CrossRefGoogle Scholar
SCHOLZ, F. G., BUCCI, S. J., GOLDSTEIN, G., MOREIRA, M. Z., MEINZER, F. C., DOMEC, J.-C., VILLALOBOS-VEGA, R., FRANCO, A. C. & MIRALLES-WILHELM, F. 2008. Biophysical and life-history determinants of hydraulic lift in Neotropical savanna trees. Functional Ecology 22:773–786.CrossRefGoogle Scholar
TASCHETTO, A. S., UMMENHOFER, C. C., SEN GUPTA, A. & ENGLAND, M. H. 2009. Effect of anomalous warming in the central Pacific on the Australian monsoon. Geophysical Research Letters 36: L12704.CrossRefGoogle Scholar
TAYLOR, J. A. & TULLOCH, D. 1985. Rainfall in the wet-dry tropics: extreme events at Darwin and similarities between years during the period 1870–1983 inclusive. Australian Journal of Ecology 10:281–295.CrossRefGoogle Scholar
VAN SCHAIK, C. P., TERBORGH, J. W. & WRIGHT, S. J. 1993. The phenology of tropical forests: adaptive significance and consequences for primary consumers. Annual Review of Ecology and Systematics 24:353–377.CrossRefGoogle Scholar
WILLIAMS, R. J., MYERS, B. A., MULLER, W. J., DUFF, G. A. & EAMUS, D. 1997. Leaf phenology of woody species in a north Australian tropical savanna. Ecology 78:2542–2558.CrossRefGoogle Scholar
WILSON, B. A. & BOWMAN, D. M. J. S. 1987. Fire, storm, flood and drought: the vegetation ecology of Howards Peninsula, Northern Territory, Australia. Australian Journal of Ecology 12:165–174.CrossRefGoogle Scholar
WORBES, M., BLANCHART, S. & FICHTLER, E. 2013. Relations between water balance, wood traits and phenological behavior of tree species from a tropical dry forest in Costa Rica – a multifactorial study. Tree Physiology 33:527–536.CrossRefGoogle ScholarPubMed
WRIGHT, S. J. & CORNEJO, F. H. 1990. Seasonal drought and leaf fall in a tropical forest. Ecology 71:1165–1175.CrossRefGoogle Scholar
YEANG, H.-Y. 2007. Synchronous flowering of the rubber tree (Hevea brasiliensis) induced by high solar radiation intensity. New Phytologist 175:283–289.CrossRefGoogle ScholarPubMed
YEH, S.-W., KUG, J.-S., DEWITTE, B., KWON, M.-H., KIRTMAN, B. P. & JIN, F.-F. 2009. El Niño in a changing climate. Nature 461:511–514.CrossRefGoogle Scholar