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Impacts of Shoreline Modification on SAV distribution

August 19, 2013. Impacts of Shoreline Modification on SAV distribution. Becky Golden, Brooke Landry, Lee Karrh and Mark Lewandowski. a. SAV bed. b. SAV bed. Methodology. Natural. RipRap. Dependent Variables: Frequency of Occurrence (patchiness) SAV Percent Cover (density)

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Impacts of Shoreline Modification on SAV distribution

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  1. August 19, 2013 Impacts of Shoreline Modification on SAV distribution Becky Golden, Brooke Landry, Lee Karrh and Mark Lewandowski

  2. a SAV bed b SAV bed Methodology Natural RipRap • Dependent Variables: • Frequency of Occurrence (patchiness) • SAV Percent Cover (density) • Species Richness & Diversity • Start of Bed (a) & • Length of Bed Distance (b) • Start Depth & End Depth • Slope

  3. Pot04 2010 2011 14 (7) 10 2012 2013 12 (7) ? 19 (7)*

  4. Preliminary Analyses • Effects of Salinity Regime & Shoreline Type • Effects of Watershed Landuse & Shoreline Type

  5. Results-Salinity Regime & Shoreline Type • Significant effect of Shoreline Type on: • Slope, minimum water depth, maximum bed length, SAV frequency, SAV % cover, species richness and diversity • Significant interactions between Salinity and Shoreline Type: • Minimum water depth, SAV % cover and species richness

  6. A SAV % cover higher @ natural sites B * *

  7. B Min H2O depths shallower @ natural sites A *

  8. SAV beds are more diverse and extended farther from shore @ natural sites

  9. Results: Watershed Land-use • Significant effect of Landuse on: • Slope, start of bed, minimum water depth, maximum water depth, maximum bed length, SAV frequency, SAV % cover, species richness and diversity • Significant interactions between Landuse and Shoreline Type: • Maximum water depth, SAV % cover and species richness

  10. A A B C D E

  11. A B BC CD BC D

  12. A A B C D D

  13. Summary • Salinity Regime and Watershed Landuse are impacting SAV at subestuary scale • Shoreline type is also affecting SAV at finer scale: • SAV adjacent to natural shorelines have higher densities, species richness and diversity, and extend farther from shore

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