کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5765236 1413063 2017 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Carbon-13 labelling shows no effect of ocean acidification on carbon transfer in Mediterranean plankton communities
ترجمه فارسی عنوان
برچسب زدن کربن 13 نشان دهنده تأثیر اسیدی شدن اقیانوس بر انتقال کربن در جوامع پلانکتون مدیترانه نیست
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی


- Mesocosm experiments performed in two Mediterranean sites during two seasons.
- Inorganic 13C was added to follow carbon transfer in plankton communities using biomarkers.
- Summer community production dominated by slow-growing species is representative of stratified nutrient limited conditions.
- Winter community evolved from a dominance of fast-growing species to slow-growing species, due to nutrient limitation.
- No detectable effect of ocean acidification on production and carbon transfer during both experiments.

Despite an increasing number of experiments, no consensus has emerged on the effect of ocean acidification on plankton communities and carbon flow. During two experiments, performed in the Bay of Calvi (France, Corsica; summer 2012) and the Bay of Villefranche (France; winter 2013), nine off-shore mesocosms (∼50 m3) were deployed among which three served as controls and six were enriched with CO2 to reach partial pressure of CO2 (pCO2) levels from 450 to 1350 μatm and 350-1250 μatm in the Bay of Calvi and the Bay of Villefranche, respectively. In each mesocosm, inorganic 13C was added in order to follow carbon transfer from inorganic via bulk particulate organic carbon and phytoplankton to bacteria by means of biomarkers as well as to zooplankton and settling particles. Despite very low plankton biomasses, labelled carbon was clearly transferred through plankton communities. Incorporation rates in the various plankton compartments suggested a slow-growing community based on regenerated production in the Bay of Calvi while in the Bay of Villefranche, fast-growing species were clearly dominating community production at the start with a shift toward slow-growing species during the experiment due to nutrient limitation. Both bulk and group-specific productions rates did not respond to increasing pCO2 levels. These experiments were the first conducted in the Mediterranean Sea under low nutrient concentrations and phytoplankton biomasses and suggest that ocean acidification may not significantly impact plankton carbon flows in low nutrient low chlorophyll (LNLC) areas.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Estuarine, Coastal and Shelf Science - Volume 186, Part A, 15 February 2017, Pages 100-111
نویسندگان
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