beach nourishment effects on nesting marine turtles whitney pyatt nc coastal reserve & nerr may 9,...
TRANSCRIPT
- Slide 1
- Beach Nourishment Effects on Nesting Marine Turtles Whitney Pyatt NC Coastal Reserve & NERR May 9, 2011
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- Background Beach nourishment is the most widely used form of stabilization and shoreline protection Implications for nesting success of marine turtles
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- Sediment Quality Grain size distribution Beach morphology Shear resistance (hardness) Density Permeability Compaction Sediment color Heat retention Mineral content Aragonite v. Silicate Sand shape Heat retention
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- Rumbold et al., 2001
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- Brock et al., 2009
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- Research Findings Steinitz et al. Nesting success: significantly lower on renourished than on the control beach both before, and for the two seasons after, the completion of a renourishment project. By the third season (year 2), no significant differences were evident. Hardness: renourished sections were significantly greater than at the control section. 1 and 2 years after the project, shear resistance declined and became comparable to control site.
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- Steinitz et al., 1998
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- Research Findings Emergence success at the renourished beaches (median of 71%) was lower than emergence success on the control beach (median of 78%), but the difference was not statistically significant. Sands used as fill matched those on the control beach in size distribution and in bulk density. Steinitz et al., 1998
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- Milton et al., 1997
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- Aragonite v. Silicate Milton et al., 1997
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- Conclusion Renourishment effects vary spatially and temporally Studies show positive, negative, and neutral effects on nest fate Most significant impacts appear to be 1-2 years postrenourishment
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- References Brock, K. et al., (2009). The Effects of Artificial Beach Nourishment on Marine Turtles: Differences Between Loggerheads and Green Turtles. Restoration Ecology 17(2), 297-307. Milton, S. et al., (1997). The Effect of Beach Nourishment with Aragonite versus Silicate Sand on Beach Temperature and Loggerhead Sea Turtle Nesting Success. Journal of Coastal Research 13(3), 904-915. Rumbold, D. et al., (2001). Estimating the Effect of Beach Nourishment on Caretta caretta (Loggerhead Sea Turtle) Nesting. Restoration Ecology 9(3), 304-310. Speybroeck J. et al., (2006). Beach Nourishment: An Ecologically Sound Coastal Defence Alternative? A Review. Aquatic Conservation: Marine and Freshwater Ecosystems 16, 419-435. Steinitz, M. et al., (1998). Beach Renourishment and Loggerhead Turtle Reproduction: A Seven Year Study at Jupiter Island, Florida. Journal of Coastal Research 14(3), 1000-1013.