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Canopy gaps do not help establish pioneer species in a South Florida dry forest

Published online by Cambridge University Press:  15 March 2016

Joshua M. Diamond  and
Michael S. Ross
Joshua M. Diamond*
Affiliation:
Florida International University, Southeastern Environmental Research Center, Miami, Florida, USA
Michael S. Ross
Affiliation:
Florida International University, Southeastern Environmental Research Center, Miami, Florida, USA
*
1Corresponding author. Email: [email protected]
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Abstract:

Canopy gaps create a temporary spatial heterogeneity, often allowing pioneer species to establish and grow in mature forests. In this study, we asked whether the above model holds for tropical dry forests in the Florida Keys. Six hundred and forty-eight canopy gaps in an extensive Key Largo forest were identified with a LiDAR digital canopy model. The structure and composition of juvenile trees were examined in 45 selected gaps in three stands of known age, and weighted averaging calibration and regression were applied to the data to determine the successional age optimum for each tree species, and the inferred age for each gap based on its sapling composition. Less than 1% of the forest area was recorded as canopy gaps in the LiDAR model. The inferred stand ages were about 70 y greater in canopy gaps in young forest than in the surrounding, unimpacted forest. This suggested that gap formation advanced succession rather than reversing or resetting it. The apparent lack of recruitment by early-successional species may be due to the small size of canopy gaps in this forest, and the minimal contrast between gap and understorey environments; light and water conditions in the small gaps may favour late-successional rather than pioneer species. Establishment of pioneer species may not take place without intense, large-scale disturbances such as fires and hurricanes that remove the entire canopy and consume or erode soils.

Keywords

canopy gapsdisturbanceFlorida Keyshardwood hammockLiDARsuccessiontropical dry forest
Type
Research Article
Information
Journal of Tropical Ecology , Volume 32 , Issue 2 , March 2016 , pp. 107 - 115
Copyright
Copyright © Cambridge University Press 2016 

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References

LITERATURE CITED

BERTELLI, B. & WILKINSON, J. 2012. Key Largo. (First edition). Arcadia Publishing, Charleston. 127 pp.Google Scholar
BROKAW, N. 1982. The definition of treefall gap and its effect on measures of forest dynamics. Biotropica 14:158–160.CrossRefGoogle Scholar
BROKAW, N. V. L. 1987. Gap phase regeneration of three pioneer tree species in a tropical forest. Journal of Ecology 75:9–19.CrossRefGoogle Scholar
CANHAM, C. D. 1989. Different responses to gaps among shade-tolerant tree species. Ecology 70:548–550.CrossRefGoogle Scholar
CANHAM, C. D., DENSLOW, J. S., PLATT, W. J., RUNKLE, J. R., SPIES, T. A. & WHITE, P. S. 1990. Light regimes beneath closed canopies and tree-fall gaps in temperate and tropical forests. Canadian Journal of Forest Research 20:620–631.CrossRefGoogle Scholar
CARRINGTON, M. E., ROSS, M. S. & BASIT, A. F. 2015. Posthurricane seedling structure in a multi-aged tropical dry forest: implications for community succession. Biotropica 47:536–541.CrossRefGoogle Scholar
CLINTON, B. D. 2003. Light, temperature, and soil moisture responses to elevation, evergreen understory, and small canopy gaps in the southern Appalachians. Forest Ecology and Management 186:243–255.Google Scholar
DALLING, J. W., HUBBELL, S. P. & SILVERA, K. 1998. Seed dispersal, seedling establishment and gap partitioning among tropical pioneer trees. Journal of Ecology 86:674–689.Google Scholar
DENSLOW, J. S. 1980. Gap partitioning among tropical rainforest trees. Biotropica 12:47–55.Google Scholar
DENSLOW, J. S. 1987. Tropical rainforest gaps and tree species diversity. Annual Review of Ecology and Systematics 18:431–451.Google Scholar
DICKINSON, M. B., HERMANN, S. M. & WHIGHAM, D. F. 2001. Low rates of background canopy-gap disturbance in a seasonally dry forest in the Yucatan Peninsula with a history of fires and hurricanes. Journal of Tropical Ecology 17:895–902.CrossRefGoogle Scholar
ENGELBRECHT, B. M. J., COMITA, L. S., 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
EVERHAM, E. M., MYSTER, R. W. & VANDEGENACHTE, E. 1996. Effects of light, moisture, temperature, and litter on the regeneration of five tree species in the tropical montane wet forest of Puerto Rico. American Journal of Botany 83:1063–1068.Google Scholar
FERNANDEZ, D. S. & FETCHER, N. 1991. Changes in light availability following Hurricane Hugo in a subtropical montane forest in Puerto Rico. Biotropica 23:393–399.Google Scholar
FRANKIE, G., BAKER, H. & OPLER, P. 1974. Comparative phenological studies of trees in tropical wet and dry forests in the lowlands. Journal of Ecology 62:881–919.Google Scholar
HORN, H. S. 1974. The ecology of secondary succession. Annual Review of Ecology and Systematics 5:25–37.Google Scholar
JUGGINS, S. 2003. C2 User Guide: software for ecological and palaeoecological data analysis and visualization. University of Newcastle, Newcastle-upon-Tyne. 69 pp.Google Scholar
KARIM, A. & MAIN, M. B. 2009. Habitat fragmentation and conservation strategies for a rare forest habitat in the Florida Keys archipelago. Urban Ecosystems 12:359–370.Google Scholar
KEIM, B. D., MULLER, R. A. & STONE, G. W. 2007. Spatiotemporal patterns and return periods of tropical storm and hurricane strikes from Texas to Maine. Journal of Climate 20:3498–3509.Google Scholar
KUPFER, J. A. & RUNKLE, J. R. 1996. Early gap successional pathways in a Fagus–Acerforest preserve: pattern and determinants. Journal of Vegetation Science 7:247–256.Google Scholar
LATIF, Z. A. & BLACKBURN, G. A. 2010. The effects of gap size on some microclimate variables during late summer and autumn in a temperate broadleaved deciduous forest. International Journal of Biometeorology 54:119–129.CrossRefGoogle Scholar
MARTHEWS, T. R., BURSLEM, D. F. R. P., PATON, S. R., YANGÜEZ, F. & MULLINS, C. E. 2008. Soil drying in a tropical forest: three distinct environments controlled by gap size. Ecological Modelling 216:369–384.Google Scholar
MCLAREN, K. P. & MCDONALD, M. A. 2003. The effects of moisture and shade on seed germination and seedling survival in a tropical dry forest in Jamaica. Forest Ecology and Management 183:61–75.CrossRefGoogle Scholar
POWELL, M. D. & HOUSTON, S. H. 1996. Hurricane Andrew's landfall in South Florida. Part II: surface wind fields and potential real-time applications. Weather and Forecasting 11:329–349.2.0.CO;2>CrossRefGoogle Scholar
RICKLEFS, R. E. 1977. Environmental heterogeneity and plant species diversity: a hypothesis. American Naturalist 111:376–381.CrossRefGoogle Scholar
ROSS, M., CARRLNGTON, M., FLYNN, L. & RUIZ, P. 2001. Forest succession in tropical hardwood hammocks of the Florida Keys: effects of direct mortality from Hurricane Andrew. Biotropica 33:23–33.Google Scholar
RUNKLE, J. R. 1981. Gap regeneration in some old-growth forests of the eastern United States. Ecology 62:1041–1051.Google Scholar
SCHNITZER, S. A. & CARSON, W. P. 2001. Treefall gaps and the maintenance of species diversity in a tropical forest. Ecology 82:913–919.Google Scholar
SWAINE, M. D. & WHITMORE, T. C. 1988. On the definition of ecological species groups in tropical rain forests. Vegetatio 75:81–86.Google Scholar
SWAINE, M. D., LIEBERMAN, D. & HALL, J. B. 1990. Structure and dynamics of a tropical dry forest in Ghana. Vegetatio 88:31–51.Google Scholar
TER, BRAAK, F., C. J. & VAN DAM, H. 1989. Inferring pH from diatoms: a comparison of old and new calibration methods. Hydrobiologia 178:209–223.Google Scholar
VAN, BLOEM, J., S., MURPHY, P. G. & LUGO, A. E. 2007. A link between hurricane-induced tree sprouting, high stem density and short canopy in tropical dry forest. Tree Physiology 27:475–480.Google Scholar
WADE, D., EWEL, J. & HOFSTETTER, R. 1980. Fire in South Florida ecosystems. U.S. Department of Agriculture, Forest Service General Technical Report.CrossRefGoogle Scholar
WASSER, L., DAY, R., CHASMER, L. & TAYLOR, A. 2013. Influence of vegetation structure on lidar-derived canopy height and fractional cover in forested riparian buffers during leaf-off and leaf-on conditions. PLoS ONE 8:e54776.Google Scholar
WHITMORE, T. C. 1989. Canopy gaps and the two major groups of forest trees. Ecology 70:536–538.Google Scholar
WUNDERLIN, R. P. & HANSEN, B. F. 2011. Guide to the vascular plants of Florida. (Third edition). University Press of Florida, Gainesville. 783 pp.Google Scholar