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• W2023704038 abstract "AEI Aquaculture Environment Interactions Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections AEI 2:49-59 (2011) - DOI: https://doi.org/10.3354/aei00031 Reduced carbon sequestration in a Mediterranean seagrass (Posidonia oceanica) ecosystem impacted by fish farming Eugenia T. Apostolaki1,2,*, Marianne Holmer3, Núria Marbà4, Ioannis Karakassis2 1Institute of Oceanography, Hellenic Centre for Marine Research, PO Box 2214, 71003, Heraklion, Crete, Greece 2Marine Ecology Laboratory, Biology Department, University of Crete, PO Box 2208, 71409, Heraklion, Crete, Greece 3Institute of Biology, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark 4Department of Global Change, Institut Mediterrani d’Estudis Avançats (CSIC-UIB), Miquel Marquès 21, 07190 Esporles (Illes Balears), Spain *Email: eapost@hcmr.gr ABSTRACT: We studied the relationship between sediment nutrient enrichment and carbon sequestration, using the ratio of gross primary production to respiration (P/R), in a fish-farming impacted and an unaffected Mediterranean seagrass (Posidonia oceanica) ecosystem in the Aegean Sea, Greece. Carbon (C), nitrogen (N) and phosphorus (P) sedimentation, nutrient pools in sediment and dissolved nutrients in pore water were significantly and positively intercorrelated, indicating close linkage between sedimentation and sediment nutrient pools in seagrass meadows. C, N and P sediment pools were significantly enhanced in the impacted meadow throughout the year, even during winter when fish farming activity was low. In the impacted sediment, the increase in C and N was higher than P, reflecting a faster remineralization and uptake of P than C and N. The ecosystem P/R ratio decreased exponentially with sediment nutrient enrichment. Threshold values are given for C, N and P sedimentation rates and sediment pools, and for N and P concentrations in pore waters, after which P/R ratio in the seagrass meadow decreases below 1, indicating a shift from autotrophy to heterotrophy with sediment nutrient enrichment. Such a regime shift indicates a loss of storage capacity of the seagrass ecosystem, jeopardizing the key role of P. oceanica as a carbon sink in the Mediterranean. KEY WORDS: Carbon sink · Eutrophication · Metabolism · Sediment · Threshold · Primary production Full text in pdf format PreviousNextCite this article as: Apostolaki ET, Holmer M, Marbà N, Karakassis I (2011) Reduced carbon sequestration in a Mediterranean seagrass (Posidonia oceanica) ecosystem impacted by fish farming. Aquacult Environ Interact 2:49-59. https://doi.org/10.3354/aei00031 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in AEI Vol. 2, No. 1. Online publication date: October 13, 2011 Print ISSN: 1869-215X; Online ISSN: 1869-7534 Copyright © 2011 Inter-Research." @default.
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• W2023704038 date "2011-10-13" @default.
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• W2023704038 title "Reduced carbon sequestration in a Mediterranean seagrass (Posidonia oceanica) ecosystem impacted by fish farming" @default.
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• W2023704038 doi "https://doi.org/10.3354/aei00031" @default.
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