Nutrient monitoring data collected as part of macroalgal surveys in Sitka Sound, Alaska kelp beds from 2016 to 2020.
To capture the annual variation in nutrient concentrations around a high latitude giant kelp bed, we sampled seawater monthly (July 2018 - July 2019) from the water column adjacent to Breast Is. in Sitka Sound, Alaska. We collected seawater using a surface-deployed Niskin bottle at 0.5 m and 4.5 m depth at each of four locations: in the middle of the Breast Is. giant kelp bed canopy, at the canopy edge, 150 m away from canopy edge, and 600 m away from the canopy edge towards the open ocean (Gulf of Alaska). In addition, we collected benthic seawater samples monthly (June 2016 - July 2017) and opportunistically (Fall 2017 - Summer 2020) using a diver-deployed Niskin bottle at 8 - 10 m depth at Breast Is., Harris Is., Samsing Pinnacle and Talon Is. (57.073 N, 135.414 W). We brought collected water to the surface, immediately filtered each sample through a 0.2 µm filter and kept it frozen until analysis for dissolved inorganic nitrogen content as NOx (NO3 + NO2) on a Lachat QuikChem 8000 Flow Injection Analyzer at the University of California Santa Cruz Marine Analytical Laboratory (detection limit < 0.28 µM NOx, average run measurement error < 0.1 µM NOx).
Additional Funding Details:
In addition to primary funding from the NSF award OCE-1752600 additional funding was provided from The David and Lucile Packard Foundation and the North Pacific Research Board’s Graduate Student Research Award (1748-01) to Lauren Bell, PhD University of California Santa Cruz, Award title: "Fish Habitat, Fishes and Invertebrates, Lower Trophic Level Productivity Effect of substrate on herring roe response to global change."
Bell, L. E., Kroeker, K. J. (2022) Nutrient monitoring data collected as part of macroalgal surveys in Sitka Sound, Alaska kelp beds from 2016 to 2020. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2022-10-11 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.882057.1 [access date]
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