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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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

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

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?

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

Sampling Stations Fish Pond

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

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 -

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

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