@article{fdi:010074889,
  title = {{C}arbonate dissolution by reef microbial borers : a biogeological process producing alkalinity under different p{CO}(2) conditions},
  author = {{T}ribollet, {A}line and {C}hauvin, {A}. and {C}uet, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{R}ising atmospheric {CO}2 is acidifying the world's oceans, affecting both calcification and dissolution processes in coral reefs. {A}mong processes, carbonate dissolution by bioeroding microflora has been overlooked, and especially its impact on seawater alkalinity. {T}o date, this biogeological process has only been studied using microscopy or buoyant weight techniques. {T}o better understand its possible effect on seawater alkalinity, and thus on reef carbonate budget, an experiment was conducted under various seawater chemistry conditions (2(arag)3.5 corresponding to 440p{CO}(2) (mu atm)940) at 25 degrees {C} under night and daylight (200 mu mol photons m(-2)s(-1)) with natural microboring communities colonizing dead coral blocks ({N}ew {C}aledonia). {B}oth the alkalinity anomaly technique and microscopy methods were used to study the activity of those communities dominated by the chlorophyte {O}streobium sp. {R}esults show that (1) the amount of alkalinity released in seawater by such communities is significant and varies between 12.8 +/- 0.7 at ({A}rag)similar to 2 and 5.6 +/- 0.4mmol {C}a{CO}3 m(-2) day(-1) at ({A}rag)similar to 3-3.5 considering a 12:12 photoperiod; (2) although dissolution is higher at night (similar to 80 vs. 20% during daylight), the process can occur under significant photosynthetic activity; and (3) the process is greatly stimulated when an acidity threshold is reached (p{CO}(2)920 mu atm vs. current conditions at constant light intensity). {W}e show that carbonate dissolution by microborers is a major biogeochemical process that could dissolve a large part of the carbonates deposited by calcifying organisms under ocean acidification.},
  keywords = {{B}iogenic carbonate dissolution ; {M}icroborers ; {E}uendoliths ; {C}oral reefs ; {O}cean acidification ; {S}eawater alkalinity ; {NOUVELLE} {CALEDONIE} ; {PACIFIQUE} {SUD}},
  booktitle = {},
  journal = {{F}acies},
  volume = {65},
  numero = {2},
  pages = {art. 9 [10 p.]},
  ISSN = {0172-9179},
  year = {2019},
  DOI = {10.1007/s10347-018-0548-x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074889},
}