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|a FCE III Year Two Annual Report For NSF Award Deb-1237517 |h [electronic resource]. |
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|i Alternate title: |a FCE Annual Reports and Proposals. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a The FCE III research framework focused on the tension between marine and freshwater supplies
has reshaped and improved our understanding of how the Everglades is responding and will
change in the future in response to changing water management in the face of sea level rise.
First, we have found that an acceleration in the rate of sea level rise, as predicted to result in
increases of 0.5 m to 2 m from 2010 to 2100, can be determined with statistical significance by
2020 to 2030 (Haigh et al., 2014). Increases in marine exposure are increasing inundation times
in the ecotone, and causing rapid changes in groundwater salinity (Zapata-Rios and Price 2012).
Laboratory results suggest that phosphorus tends to adsorb to sediments in the presence of
freshwater and desorb from sediments in the presence of native Florida Bay water, consistent
with the findings of Price et al. (2010) and suggesting a trend toward phosphorus desorption
under sea-level rise in the absence of additional freshwater inflows (Fig. 1). Therefore, increased
marine exposure from groundwater sources is increasing salinity, inundation and phosphorus in
the ecotone, confirming an appropriate context for conducting and interpreting our long-term and
experimental research.
Initial experiments to determine the influence of elevated phosphorus and plant defoliation
(simulating storm damage) on ecotone carbon exchange and stoichiometry was successful in
addressing our key hypotheses. We found that phosphorus exposure to mangrove peat soils
reduced N:P and C:P, increased net aquatic ecosystem productivity, reduced respiration and
resulted in an overall increase in soil CO2-C flux (Fig. 2-5). Mangrove defoliation reduced
aquatic gross primary productivity and ecosystem respiration. Overall, added phosphorus
increased soil organic C mineralization suggesting that increased phosphorus loading with sea
level rise, together with elevated salinity (Chambers et al. 2014), may increase soil carbon losses. However, increased aquatic production may offset this influence on soils. Storms that deliver Prich sediment to coastal wetlands may be important short-term drivers of longer-term increases in coastal net ecosystem production through enhanced terrestrial and aquatic gross primary production. These results set the stage for more extensive long-term experiments in the
laboratory and field. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a Freshwater |z Florida. |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062196/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/21/96/00001/FCE III Year Two Annual Report For NSF Award Deb-1237517thm.jpg |
