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Spatial and Temporal Nutrient Patterns in Coastal Waters of Kaloko-Honokōhau Tracy Wiegner 1, Jason Adolf 1, Jim Beets 1, Rebecca Most 2, Erik Johnson.

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Presentation on theme: "Spatial and Temporal Nutrient Patterns in Coastal Waters of Kaloko-Honokōhau Tracy Wiegner 1, Jason Adolf 1, Jim Beets 1, Rebecca Most 2, Erik Johnson."— Presentation transcript:

1 Spatial and Temporal Nutrient Patterns in Coastal Waters of Kaloko-Honokōhau Tracy Wiegner 1, Jason Adolf 1, Jim Beets 1, Rebecca Most 2, Erik Johnson 2, and Judy Walker 2 1 Marine Science Department, University of Hawaii at Hilo 2 Tropical Conservation Biology and Environmental Sciences Graduate Program, University of Hawaii at Hilo

2 Coral Reef Groundwater is the predominant freshwater source to leeward coasts on the Hawaiian Islands

3 Preliminary Questions to Identify ‘Hot Spots’ of Biological Transformations 1.How do surface water dissolved nitrogen (N) concentrations vary spatially and temporally? 2.How do the relative percent contributions of N forms to the dissolved N pool vary spatially and temporally? 3.How do dissolved N concentrations change with depth and vary temporally?

4 Site: Kaloko-Honokōhau Approach 1.Map surface water characteristics using a water quality sensor Aerial infrared imagery from C. Glenn. 2. Collect pelagic and benthic water quality samples

5 Sampling Stations Fish Pond

6 May 2010 July 2010 Salinity Nitrate How do surface water dissolved N concentrations vary spatially and temporally? High concentrations of NO 3 - & DON were found near the fish pond with low salinity waters Concentrations & spatial patterns varied between months DON May 2010 July 2010 ppt µM

7 MAY 2010 JULY 2010 Increasing %DON Increasing %NO 3 - How do the relative % contributions of dissolved N forms to the dissolved N pool vary spatially & temporally? %DON increased offshore %NO 3 - increased inshore Relative percentages changed monthly, but spatial patterns were consistent Changes occurred within 200 m of fish pond wall DON NO 3 -

8 Depth Profiles at Station 14 How do dissolved N concentrations change with depth & vary temporally? Concentrations decreased with depth & profile patterns were consistent between months

9 Thank you! Gillian Wysock, Mauritius Bell, Jonatha Giddens, Kerrie Krosky, Joao Garriques, Brain Yannutz, Caitlin Kryss, Ambyr Mokiao-Lee, Nakoa Goo, and Jackie Troller And our partners at the NPS: Sallie Beavers and Lindsay Cramer

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