Coral uptake of inorganic phosphorus and nitrogen negatively affected by simultaneous changes in temperature and pH - IRD - Institut de recherche pour le développement Access content directly
Journal Articles PLoS ONE Year : 2011

Coral uptake of inorganic phosphorus and nitrogen negatively affected by simultaneous changes in temperature and pH

Abstract

The effects of ocean acidification and elevated seawater temperature on coral calcification and photosynthesis have been extensively investigated over the last two decades, whereas they are still unknown on nutrient uptake, despite their importance for coral energetics. We therefore studied the separate and combined impacts of increases in temperature and pCO(2) on phosphate, ammonium, and nitrate uptake rates by the scleractinian coral S. pistillata. Three experiments were performed, during 10 days i) at three pHT conditions (8.1, 7.8, and 7.5) and normal temperature (26 degrees C), ii) at three temperature conditions (26 degrees, 29 degrees C, and 33 degrees C) and normal pH(T) (8.1), and iii) at three pH(T) conditions (8.1, 7.8, and 7.5) and elevated temperature (33 degrees C). After 10 days of incubation, corals had not bleached, as protein, chlorophyll, and zooxanthellae contents were the same in all treatments. However, photosynthetic rates significantly decreased at 33 degrees C, and were further reduced for the pH(T) 7.5. The photosynthetic efficiency of PSII was only decreased by elevated temperature. Nutrient uptake rates were not affected by a change in pH alone. Conversely, elevated temperature (33 degrees C) alone induced an increase in phosphate uptake but a severe decrease in nitrate and ammonium uptake rates, even leading to a release of nitrogen into seawater. Combination of high temperature (33 degrees C) and low pH(T) (7.5) resulted in a significant decrease in phosphate and nitrate uptake rates compared to control corals (26 degrees C, pH(T) = 8.1). These results indicate that both inorganic nitrogen and phosphorus metabolism may be negatively affected by the cumulative effects of ocean warming and acidification.
Fichier principal
Vignette du fichier
Godinot_et_al_-_2011_-_PLOS.pdf (297.55 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

ird-00668401 , version 1 (09-02-2012)

Identifiers

Cite

C. Godinot, Fanny Houlbreque, R. Grover, C. Ferrier-Pages. Coral uptake of inorganic phosphorus and nitrogen negatively affected by simultaneous changes in temperature and pH. PLoS ONE, 2011, 6 (9), pp.e25024. ⟨10.1371/journal.pone.0025024⟩. ⟨ird-00668401⟩

Collections

IRD IRSN AGROPOLIS
134 View
369 Download

Altmetric

Share

Gmail Facebook X LinkedIn More