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• W2329501187 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 480:21-37 (2013) - DOI: https://doi.org/10.3354/meps10225 Hydrographic and biological controls in two subarctic fjords: an environmental case study of how climate change could impact phytoplankton communities Antonietta Quigg1,2,*, Clifton C. Nunnally2, Allison S. McInnes2, Shelton Gay2, Gilbert T. Rowe1,2, Timothy M. Dellapenna2,3, Randall W. Davis1,4 1Department of Marine Biology, and 3Department of Marine Science, Texas A&M University at Galveston, 200 Seawolf Parkway, Galveston, Texas 77553, USA 2Department of Oceanography, and 4Department of Wildlife and Fisheries Science, Texas A&M University, College Station, Texas 77843, USA *Email: quigga@tamug.edu ABSTRACT: Over the past 50 yr, Alaska has warmed at more than twice the rate of the rest of the United States so that climate change impacts are much more pronounced in this region. Simpson and Sheep Bays are pristine fjords in Prince William Sound which differ significantly in terms of size and bathymetry, watershed topography and presence of alpine glaciers. During summers in 2006 to 2008, we investigated the relationship between hydrography and phytoplankton ecology. We found phytoplankton standing stocks and productivity were higher in Simpson relative to Sheep Bay. Phytoplankton physiology (measured with a fluorescence induction and relaxation system) was not significantly different (p > 0.05) in the 2 fjords: FV/FM = 0.32 to 0.67, σPSII = 141 to 391 Å2 quanta-1, τQa = 125 to 1020 µs, and p = 0.06 to 0.39. Resource (also known as nutrient) limitation assays revealed a gradient of nutrient co-limitation (NSi to NP, respectively) from the delta to the mouth in Simpson Bay. Phytoplankton dynamics were found to be driven by wind mixing and nutrient upwelling which fueled productivity in the upper water column. A comparison of temperature/salinity profiles measured in the present study with those in 1996/1997 revealed a decadal change in hydrography. Both fjords exhibited deep vertical gradients indicative of moderate vertical mixing in 1996/1997, while those measured in 2007/2008 were shallow, with significant stratification. These changes in hydrography, associated with climate change at these high latitudes, will likely lower phytoplankton productivity due to decreased reintroduction of nutrients to surface waters. Consequences to higher trophic levels of reduced food supply require further investigation, including food web and modeling studies. KEY WORDS: Phytoplankton · Fjords · Alaska · Chlorophyll fluorescence · Primary productivity · Nutrients · Resource limitation assays · Climate change Full text in pdf format PreviousNextCite this article as: Quigg A, Nunnally CC, McInnes AS, Gay S, Rowe GT, Dellapenna TM, Davis RW (2013) Hydrographic and biological controls in two subarctic fjords: an environmental case study of how climate change could impact phytoplankton communities. Mar Ecol Prog Ser 480:21-37. https://doi.org/10.3354/meps10225 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 480. Online publication date: April 22, 2013 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2013 Inter-Research." @default.
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• W2329501187 date "2013-04-22" @default.
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• W2329501187 title "Hydrographic and biological controls in two subarctic fjords: an environmental case study of how climate change could impact phytoplankton communities" @default.
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• W2329501187 doi "https://doi.org/10.3354/meps10225" @default.
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