How quickly can restored oyster reefs recover biogeochemical properties?

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1 How quikly n restored oyster reefs reover iogeohemil properties? Bryn Loher, Ni R. Hurst, Lis G. Chmers Aquti Biogeohemistry Lortory, University of Centrl Florid 0

2 Mesures of oyster reef reovery Common metris Reef height Reef re Numer of oysters Shell lengths Metris of funtioning Fish undne nd diversity Wter filtrtion ility 1

3 How do reefs funtion s iogeohemil hotspots? Bioti ftors (iodeposits nd miroil sequestrtion) Aioti ftors (hydrodynmis nd deposition) Newell et l

4 Totl Cron (g kg -1 ) Totl Nitrogen (g kg -1 ) Sediment nutrient storge s reefs ge In one yer, orgni mtter ontent inresed y 164%, Totl C y 236%, Totl N y 260% Ded 1-yr 4-yr 7-yr Ref. Chmers et l., Ded 1-yr 4-yr 7-yr Ref. 3

5 Reserh Question Within the first yer of restortion, when do restored reefs in Mosquito Lgoon hieve nturl reef iogeohemil funtioning? Higher resolution mesurements of hnges in sediment iogeohemil properties over the first yer 4

6 Study Site Legend 4 Ded reefs 4 Nturl reefs 4 Restored reefs Bot wkes use ded mrgins 40% loss of oyster reef overge within Cnverl Ntionl Seshore sine 1943 (Grvis et l. 2015) 5

7 Methods Before-fter-ontrol-impt study design Time points: efore restortion, 1 week, 1 month, 6 months, 9 months, nd 12 months Only one efore mesurement 6

8 Methods Short-term ioville nutrients Cron DOC Nitrogen mmonium (NH 4+ ) nd nitrte (NO 3- ) Phosphorous - PO 4 3- Long-term stored nutrients Totl = Orgni + Inorgni Totl nitrogen Totl ron, phosphorous, nd orgni mtter ontent in progress Evlute iogeohemil funtioning y mesuring nutrient uril 7

9 Methods? 8

10 g/kg sediment Results Short-term nutrients Bioville Phosphorous (PO 4 3- ) Before 1 Week 1 Month 6 Months Time Post-Restortion 9 Months 9

11 g/kg sediment Results Short-term nutrients Bioville Nitrte (NO 3- ) Before 1 Week 1 Month 6 Months 9 Months Time Post-Restortion Sediment nitrte levels my e hnging sesonlly 10

12 g/kg sediment Results Short-term nutrients Bioville Ammonium (NH 4+ ) Before 1 Week 1 Month 6 Months 9 Months Time Post-Restortion Ammonium onentrtions reh nturl reef levels t Relted to numer of oysters nd reef thikness? 1 month post-restortion 11

13 g/kg sediment Results Short-term nutrients Restored reef sediments exeed nturl reef levels y 6 months post-restortion Dissolved Orgni Cron Before 1 Week 1 Month 6 Months 9 Months Time Post-Restortion 12

14 g/kg sediment Results Long-term nutrients Totl nitrogen higher thn ded reefs fter 6 months post-restortion Totl Sediment Nitrogen Before 1 Week 1 Month Time Post-Restortion 6 Months 9 Months 13

15 Conlusions Biogeohemil properties respond to restortion t different rtes in Mosquito Lgoon Phosphte nd totl nitrogen egin to differ from ded reefs t 6 months Ammonium nd dissolved orgni ron reh nturl reef levels y 1 month Biogeohemil funtioning on Mosquito Lgoon Reefs is restored y 6 months? Sediment nutrient levels n help monitor restortion suess 14

16 Future diretions Relte sediment nutrient hnges to numer of oysters nd reef thikness Perent orgni mtter s simpler method to monitor reovery of iogeohemil funtioning Investigtion of these sediment properties on oyster reefs in other res 15

17 Aknowledgements 16