Abstract
We investigated the effects of light and flooding on growth and survivorship of saplings in a river floodplain forest of southeast Texas. Growth responses to light were consistent with the expectation that shade-intolerant species grow faster than shade-tolerant species in high light, and vice versa. Mortality risk was not associated with shade tolerance level unless high mortality risks associated with a period of high flooding were removed. These results support the hypothesis that shade-tolerant species in floodplains may be limited by flooding as previous studies suggested. Also, compared to their performance at a nearby mesic site, common species showed little intraspecific difference in shade tolerance, especially for shade-intolerant species. Finally, the positive correlation between low-light growth and survivorship suggests that carbon allocation to continued growth may be favored as a sapling strategy in floodplains.
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Acknowledgements
We thank all people involved in collecting the long-term data set of this forest, including former graduate students, postdoctoral fellows and undergraduates. Special thanks go to I.S. Elsik who also manages the data. Lisa Sweeney, Wendy Park, Tina Snyder helped taking hemispherical photos in the fields. Cherri Higgins scanned the photos. We thank two anonymous reviewers for their comments that improve the manuscripts. Funding for this study was provided by NSF grants to P.H. (DEB-9726467) and M.F. (DEB-9816493) and a Wray-Todd Fellowship to J.L.
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Lin, J., Harcombe, P.A., Fulton, M.R. et al. Sapling growth and survivorship as affected by light and flooding in a river floodplain forest of southeast Texas. Oecologia 139, 399–407 (2004). https://doi.org/10.1007/s00442-004-1522-6
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DOI: https://doi.org/10.1007/s00442-004-1522-6