Carbon and nitrogen allocation strategy in Posidonia oceanica is altered by seawater acidification
| Autor: | Andrea Scartazza, Maurizio Lorenti, Samantha L. Garrard, Enrico Brugnoli, Carlo Calfapietra, Stefano Moscatello, Olga Gavrichkova, Alberto Battistelli, Maria Cristina Buia, Marco Lauteri |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
CO2 vents Environmental Engineering 010504 meteorology & atmospheric sciences 01 natural sciences Botany Environmental Chemistry Organic matter 14. Life underwater Waste Management and Disposal Seagrass Stable isotopes 0105 earth and related environmental sciences chemistry.chemical_classification biology 010604 marine biology & hydrobiology Nitrogen reserves Ecophysiological responses Ocean acidification 15. Life on land biology.organism_classification Pollution Food web Rhizome Storage carbohydrates chemistry 13. Climate action Posidonia oceanica Shoot Seawater |
| Zdroj: | Science of the total environment 607-608 (2017): 954–964. doi:10.1016/j.scitotenv.2017.06.084 info:cnr-pdr/source/autori:Scartazza, Andrea; Moscatello, Stefano; Gavrichkova, Olga; Buia, Maria Cristina; Lauteri, Marco; Battistelli, Alberto; Lorenti, Maurizio; Garrard, Samantha Laird; Calfapietra, Carlo; Brugnoli, Enrico/titolo:Carbon and nitrogen allocation strategy in Posidonia oceanica is altered by seawater acidification./doi:10.1016%2Fj.scitotenv.2017.06.084/rivista:Science of the total environment/anno:2017/pagina_da:954/pagina_a:964/intervallo_pagine:954–964/volume:607-608 |
| ISSN: | 1879-1026 |
| DOI: | 10.1016/j.scitotenv.2017.06.084 |
| Popis: | Rising atmospheric CO2 causes ocean acidification that represents one of the major ecological threats for marine biota. We tested the hypothesis that long-term exposure to increased CO2 level and acidification in a natural CO2 vent system alters carbon (C) and nitrogen (N) metabolism in Posidonia oceanica L. (Delile), affecting its resilience, or capability to restore the physiological homeostasis, and the nutritional quality of organic matter available for grazers. Seawater acidification decreased the C to N ratio in P. oceanica tissues and increased grazing rate, shoot density, leaf proteins and asparagine accumulation in rhizomes, while the maximum photochemical efficiency of photosystem II was unaffected. The 13C-dilution in both structural and non-structural C metabolites in the acidified site indicated quali-quantitative changes of C source and/or increased isotopic fractionation during C uptake and carboxylation associated with the higher CO2 level. The decreased C:N ratio in the acidified site suggests an increased N availability, leading to a greater storage of 15N-enriched compounds in rhizomes. The amount of the more dynamic C storage form, sucrose, decreased in rhizomes of the acidified site in response to the enhanced energy demand due to higher shoot recruitment and N compound synthesis, without affecting starch reserves. The ability to modulate the balance between stable and dynamic C reserves could represent a key ecophysiological mechanism for P. oceanica resilience under environmental perturbation. Finally, alteration in C and N dynamics promoted a positive contribution of this seagrass to the local food web. |
| Databáze: | OpenAIRE |
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