TAILIEUCHUNG - Effects of elevated CO2 and nutrients on the community metabolism of a Cymodocea nodosa bed
The variation pattern of NCP with the ordinance was consistent for all treatments. Although differences among treatments were not statistically significant, average NCP values were lowest under CO2 enrichment conditions. NCP was lower at a high CO2 level and ambient nitrogen concentration compared to when nutrient availability was higher, suggesting that the low nutrient availability may modulate the community response to CO2 enrichment. | Turkish Journal of Botany Turk J Bot (2016) 40: 250-257 © TÜBİTAK doi: Research Article Effects of elevated CO2 and nutrients on the community metabolism of a Cymodocea nodosa bed 1, 1 2 1 Faisal KHAN *, Ana ALEXANDRE , Hadayet ULLAH , Rui SANTOS Marine Plant Ecology Research Group, Centre of Marine Sciences (CCMAR), University of Algarve, Gambelas, Faro, Portugal 2 WorldFish, Banani, Dhaka, Bangladesh 1 Received: Accepted/Published Online: Final Version: Abstract: We assessed the combined effects of elevated CO2 and nutrients on the metabolism of a benthic community dominated by the seagrass Cymodocea nodosa (Ucria) Ascherson in a mesocosm experiment. C. nodosa plants and their associated community were exposed to two CO2 levels simulating future (700 ppm, pH ) and current (360 ppm, pH ) conditions, and two nutrient levels (enriched and ambient concentration) in a total of four treatments (-C-N, -C+N, +C-N, +C+N). Net community production (NCP) was estimated from changes in the concentration of dissolved inorganic carbon in the seawater in light incubations using benthic chambers. The variation pattern of NCP with the ordinance was consistent for all treatments. Although differences among treatments were not statistically significant, average NCP values were lowest under CO2 enrichment conditions. NCP was lower at a high CO2 level and ambient nitrogen concentration compared to when nutrient availability was higher, suggesting that the low nutrient availability may modulate the community response to CO2 enrichment. The results obtained suggest that the stimulation of the net community production of C. nodosa by elevated CO2 concentrations may be curtailed by low nutrient availability. Key words: CO2 enrichment, net community production, nutrients, seagrass 1. Introduction Oceans are currently absorbing approximately 30% of the atmospheric CO2, leading .
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