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Supplemental irrigation increases seedling performance and diversity in a tropical forest

Published online by Cambridge University Press:  01 March 2009

C. E. Timothy Paine ,
Kyle E. Harms  and
Jesús Ramos
C. E. Timothy Paine*
Affiliation:
Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA
Kyle E. Harms
Affiliation:
Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA Smithsonian Tropical Research Institute, Apartado 2072, Balboa, Panama
Jesús Ramos
Affiliation:
Asociación para la Conservación de la Cuenca Amazónica, Puerto Maldonado, Jiron Cusco 499, Puerto Maldonado, Peru
*
1Corresponding author. Current address: UMR EcoFoG – ENGREF, Campus agronomique, BP 709, 97379 Kourou cedex, French Guiana. Email: [email protected]
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Abstract:

Diversity is positively correlated with water availability at global, continental and regional scales. With the objective of better understanding the mechanisms that drive these relationships, we investigated the degree to which variation in water availability affects the performance (recruitment, growth and survival) of juvenile trees. Precipitation was supplemented throughout two dry seasons in a seasonal moist forest in south-eastern Peru. Supplementing precipitation by 160 mm mo−1, we increased soil moisture by 17%. To generate seedling communities of known species composition, we sowed 3840 seeds of 12 species. We monitored the fates of the 554 seedlings recruited from the sown seeds, as well as 1856 older non-sown seedlings (10 cm ≤ height < 50 cm), and 2353 saplings (> 1 m tall). Watering significantly enhanced young seedling growth and survival, increasing stem density and diversity. Watering diminished the recruitment of species associated with upland forests, but increased the survival of both upland- and lowland-associated species. Though supplemental watering increased the growth of older seedlings, their density and diversity were unaffected. Sapling performance was insensitive to watering. We infer that variation in dry-season water availability may affect seedling community structure by differentially affecting recruitment and increasing overall survival. These results suggest that differential seedling recruitment and survival may contribute to the observed relationships between water availability, habitat associations and patterns of tree species richness.

Keywords

diversityEstación Biológica Los Amigoshabitat filteringpalmsPeruprecipitationseasonalityseedling recruitment
Type
Research Article
Information
Journal of Tropical Ecology , Volume 25 , Issue 2 , March 2009 , pp. 171 - 180
Copyright
Copyright © Cambridge University Press 2009

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References

LITERATURE CITED

ALLEN, A. P., BROWN, J. H. & GILLOOLY, J. F. 2002. Global biodiversity, biochemical kinetics, and the energetic-equivalence rule. Science 297:1545–1548.Google Scholar
ALVAREZ-LOAYZA, P., WHITE, J. F., BERGEN, M. & CADENAS, C. 2008. Diplodia mutila causing seedling mortality of the palm Iriartea deltoidea. Plant Pathology 57:382.CrossRefGoogle Scholar
BARALOTO, C., MORNEAU, F., BONAL, D., BLANC, L. & FERRY, B. 2007. Seasonal water stress tolerance and habitat associations within four Neotropical tree genera. Ecology 88:478–489.Google Scholar
BUNKER, D. E. & CARSON, W. P. 2005. Drought stress and tropical forest woody seedlings: effect on community structure and composition. Journal of Ecology 93:794–806.CrossRefGoogle Scholar
CLINEBELL, R. R., PHILLIPS, O. L., GENTRY, A. H., STARK, N. & ZUURING, H. 1995. Prediction of neotropical tree and liana species richness from soil and climatic data. Biodiversity and Conservation 4:56–90.Google Scholar
CONDIT, R., AGUILAR, S., HERNÁNDEZ, A., PÉREZ, R., LAO, S., ANGEHR, G., HUBBELL, S. P. & FOSTER, R. B. 2004. Tropical forest dynamics across a rainfall gradient and the impact of an El Niño dry season. Journal of Tropical Ecology 20:51–72.CrossRefGoogle Scholar
DELISSIO, L. J. & PRIMACK, R. B. 2003. The impact of drought on the population dynamics of canopy-tree seedlings in an aseasonal Malaysian rain forest. Journal of Tropical Ecology 19:489–500.CrossRefGoogle Scholar
ENGELBRECHT, B. M. J. & KURSAR, T. A. 2003. Comparative drought-resistance of seedlings of 28 species of co-occurring tropical woody plants. Oecologia 136:383–393.CrossRefGoogle ScholarPubMed
ENGELBRECHT, B. M. J., COMITA, L., CONDIT, R., KURSAR, T. A., TYREE, M. T., TURNER, B. L. & HUBBELL, S. P. 2007. Drought sensitivity shapes species distribution patterns in tropical forests. Nature 447:80–82.Google Scholar
FISHER, B. L., HOWE, H. F. & WRIGHT, S. J. 1991. Survival and growth of Virola surinamensis yearlings: water augmentation in gap and understory. Oecologia 86:292–297.CrossRefGoogle ScholarPubMed
FOSTER, S. A. & JANSON, C. H. 1985. The relationship between seed size and establishment conditions in tropical woody plants. Ecology 66:773–780.Google Scholar
GRAHAM, E. A., MULKEY, S. S., KITAJIMA, K., PHILLIPS, N. G. & WRIGHT, S. J. 2003. Cloud cover limits net CO2 uptake and growth of a rainforest tree during tropical rainy seasons. Proceedings of the National Academy of Sciences of the USA 100:572–576.Google Scholar
HARMS, K. E., CONDIT, R., HUBBELL, S. P. & FOSTER, R. B. 2001. Habitat associations of trees and shrubs in a 50-ha neotropical forest plot. Journal of Ecology 89:947–959.Google Scholar
HARPER, J. L. 1977. Population biology of plants. Academic Press, London. 892 pp.Google Scholar
HOLDRIDGE, L. R. 1947. Determination of world plant formations from simple climatic data. Science 105:367–368.CrossRefGoogle ScholarPubMed
KREFT, H. & JETZ, W. 2007. Global patterns and determinants of vascular plant diversity. Proceedings of the National Academy of Sciences of the USA 104:5925–5930.CrossRefGoogle ScholarPubMed
LEWIS, S. L. & TANNER, E. V. J. 2000. Effects of above- and belowground competition on growth and survival of rain forest tree seedlings. Ecology 81:2525–2538.Google Scholar
NEPSTAD, D. C., TOHVER, I. M., RAY, D., MOUTINHO, P. & CARDINOT, G. 2007. Mortality of large trees and lianas following experimental drought in an Amazon forest. Ecology 88:2259–2269.CrossRefGoogle Scholar
PAINE, C. E. T. & HARMS, K. E. in press. Quantifying the effects of seed arrival and environmental conditions on tropical seedling community structure. Oecologia. DOI: 10.1007/s00442-008-1269-6.Google Scholar
PAZ, H. & MARTINEZ-RAMOS, M. 2003. Seed mass and seedling performance within eight species of Psychotria (Rubiaceae). Ecology 84:439–450.CrossRefGoogle Scholar
PEÑA-CLAROS, M. & DE BOO, H. 2002. The effect of forest successional stage on seed removal of tropical rain forest tree species. Journal of Tropical Ecology 18:261–274.CrossRefGoogle Scholar
PHILLIPS, O. L., HALL, P., GENTRY, A. H., SAWYER, S. A. & VASQUEZ, R. 1994. Dynamics and species richness of tropical rain-forests. Proceedings of the National Academy of Sciences of the USA 91:2805–2809.CrossRefGoogle ScholarPubMed
PINHEIRO, J. C. & BATES, D. M. 2002. Mixed-effects models in S and S-PLUS. Springer, Berlin. 528 pp.Google Scholar
PITMAN, N. C. A., TERBORGH, J. W., SILMAN, M. R., NUNEZ, P., NEILL, D. A., CERON, C. E., PALACIOS, W. A. & AULESTIA, M. 2002. A comparison of tree species diversity in two upper Amazonian forests. Ecology 83:3210–3224.Google Scholar
POORTER, L. & MARKESTEIJN, L. 2008. Seedling traits determine drought tolerance of tropical tree species. Biotropica 40:321–331.CrossRefGoogle Scholar
TANNER, E. V. J. & BARBERIS, I. M. 2007. Trenching increased growth, and irrigation increased survival of tree seedlings in the understorey of a semi-evergreen rain forest in Panama. Journal of Tropical Ecology 23:257–268.Google Scholar
WILLIAMSON, G. B., LAURANCE, W. F., OLIVEIRA, A. A., DELAMONICA, P., GASCON, C., LOVEJOY, T. E. & POHL, L. 2000. Amazonian tree mortality during the 1997 El Niño drought. Conservation Biology 14:1538–1542.Google Scholar
WRIGHT, S. J. 1992. Seasonal drought, soil fertility and the species density of tropical forest plant-communities. Trends in Ecology and Evolution 7:260–263.Google Scholar
WRIGHT, S. J. & CORNEJO, F. H. 1990. Seasonal drought and leaf fall in a tropical forest. Ecology 71:1165–1175.CrossRefGoogle Scholar
YAVITT, J. B. & WRIGHT, S. J. 2008. Seedling growth responses to water and nutrient augmentation in the understorey of a lowland moist forest, Panama. Journal of Tropical Ecology 24:19–26.CrossRefGoogle Scholar