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Beach Nourishment Effects on Nesting Marine Turtles

Beach Nourishment Effects on Nesting Marine Turtles. Whitney P yatt NC Coastal Reserve & NERR May 9, 2011. Background. Beach nourishment is the most widely used form of stabilization and shoreline protection Implications for nesting success of marine turtles. Sediment Quality.

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Beach Nourishment Effects on Nesting Marine Turtles

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  1. Beach Nourishment Effects on Nesting Marine Turtles Whitney Pyatt NC Coastal Reserve & NERR May 9, 2011

  2. Background • Beach nourishment is the most widely used form of stabilization and shoreline protection • Implications for nesting success of marine turtles

  3. 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

  4. Rumbold et al., 2001

  5. Rumbold et al., 2001

  6. Brock et al., 2009

  7. Brock et al., 2009

  8. 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.

  9. Steinitz et al., 1998

  10. 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

  11. Milton et al., 1997

  12. Aragonite v. Silicate Milton et al., 1997

  13. 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

  14. References • Brock, K. et al., (2009). The Effects of Artificial Beach Nourishment on Marine Turtles: Differences Between Loggerheads and Green Turtles. Restoration Ecology17(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 Carettacaretta (Loggerhead Sea Turtle) Nesting. Restoration Ecology 9(3), 304-310. • SpeybroeckJ. 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.

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