NDLI: Metabolic Imbalance in Coastal Vegetated (Posidonia oceanica) and Unvegetated Benthic Ecosystems

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Metabolic Imbalance in Coastal Vegetated (Posidonia oceanica) and Unvegetated Benthic Ecosystems

Content Provider	Springer Nature Link
Author	Apostolaki, Eugenia T. Holmer, Marianne Marbà, Núria Karakassis, Ioannis
Copyright Year	2010
Abstract	Community metabolism and dissolved organic and inorganic nutrient fluxes were assessed in impacted from fish farm discharges and reference vegetated (Posidonia oceanica) and adjacent unvegetated communities in the Aegean Sea, Greece. Both metabolism and nutrient fluxes significantly differed between impacted and reference communities, but the effect depended on community type and time of year. Net community production (NCP) in the impacted vegetated community decreased by 60%, respiration (R) by 34%, and gross primary production (GPP) by 44%. The GPP:R ratio declined more (35%) in the impacted unvegetated than in the corresponding vegetated community (15%), implying that proximity to the fish farm has a severe impact on the unvegetated community, leading to imbalanced metabolism (GPP < R) and heterotrophic (GPP:R = 0.9) conditions. Higher release of dissolved organic and inorganic carbon, nitrogen, and phosphorous was observed in the impacted vegetated community compared to the corresponding unvegetated one, implying intensification of mineralization in the seagrass community. On an annual scale, the impacted vegetated community supported increased DOC efflux by 204%, DON by 1639%, NH4 by 122%, and NO3 by 26%, whereas it supported release of DOP and PO4 compared to the reference community, which removed these dissolved nutrients from the water column. The impacted unvegetated community supported an annual increase of DOC efflux by 208% and PO4 by 42% and it released DON, NH4, NO3, and DOP, whereas the reference community took up these nutrients. Proximity to the fish farm altered the ecosystem state by lowering the productivity and by enhancing the nutrient release.
Starting Page	459
Ending Page	471
Page Count	13
File Format	PDF
ISSN	14329840
Journal	Ecosystems
Volume Number	13
Issue Number	3
e-ISSN	14350629
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-04-14
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	eutrophication net community production nutrient cycling dissolved organic matter seagrass fish farming Mediterranean Nature Conservation Geoecology/Natural Processes Environmental Management Zoology Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry Ecology, Evolution, Behavior and Systematics

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Degrading seagrass (Posidonia oceanica) ecosystems: a source of dissolved matter in the Mediterranean

Response of Benthic Protozoa and Thraustochytrid Protists to Fish Farm Impact in Seagrass (Posidonia oceanica) and Soft-Bottom Sediments

Iron Additions Reduce Sulfide Intrusion and Reverse Seagrass (Posidonia oceanica) Decline in Carbonate Sediments

Carbon and nutrient deposition in a mediterranean seagrass (posidonia oceanica). Limnology and oceanography (2002).

Impacts of Nutrient Reduction on Coastal Communities

Reduced carbon sequestration in a Mediterranean seagrass (Posidonia oceanica) ecosystem impacted by fish farming

Bacterial Community Dynamics in a Seagrass (Posidonia oceanica) Meadow Sediment

Posidonia oceanica as a Source of Chromophoric Dissolved Organic Matter for the Oligotrophic NW Mediterranean Coast

Ecosystem Structure and Function Still Altered Two Decades After Short-Term Fertilization of a Seagrass Meadow

Metabolic Imbalance in Coastal Vegetated (Posidonia oceanica) and Unvegetated Benthic Ecosystems

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Metabolic Imbalance in Coastal Vegetated (Posidonia oceanica) and Unvegetated Benthic Ecosystems