FN Archimer Export Format
PT J
TI Natural photosynthetic microboring communities produce alkalinity in seawater whereas aragonite saturation state rises up to five
BT 
AF Tribollet, Aline
   Chauvin, Anne
   Cuet, Pascale
AS 1:1,2;2:1;3:3;
FF 1:;2:;3:;
C1 IRD-Sorbonne University-CNRs-MNHN, UMR LOCEAN-IPSL, Paris, France
   HIMB, SOEST-University of Hawaii, Kaneohe, HI, United States
   UMR ENTROPIE (Université de La Réunion-IRD-CNRS-Ifremer-Université de la Nouvelle Calédonie)—Labex Corail, Université de La Réunion, Réunion, France
C2 IRD, FRANCE
   UNIV HAWAII, USA
   UNIV LA REUNION, FRANCE
UM ENTROPIE
IN WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-int-hors-europe
IF 2.9
TC 1
UR https://archimer.ifremer.fr/doc/00813/92499/98740.pdf
LA English
DT Article
DE ;biogenic carbonate dissolution;microboring flora;euendoliths;production of seawater alkalinity;saturation state of aragonite;coral reef ecosystems
AB Bioerosion, resulting from microbioerosion or biogenic dissolution, macrobioerosion and grazing, is one the main processes involved in reef carbonate budget and functioning. On healthy reefs, most of the produced carbonates are preserved and accumulate. But in the context of global change, reefs are increasingly degraded as environmental factors such as ocean warming and acidification affect negatively reef accretion and positively bioerosion processes. The recent 2019 SROCC report suggests that if CO2 emissions in the atmosphere are not drastically reduced rapidly, 70%–99% of coral reefs will disappear by 2,100. However, to improve projections of coral reef evolution, it is important to better understand dynamics of bioerosion processes. Among those processes, it was shown recently that bioeroding microflora which actively colonize and dissolve experimental coral blocks, release significant amount of alkalinity in seawater both by day and at night under controlled conditions. It was also shown that this alkalinity production is enhanced under ocean acidification conditions (saturation state of aragonite comprised between 2 and 3.5) suggesting that reef carbonate accumulation will be even more limited in the future. To better understand the conditions of production of alkalinity in seawater by boring microflora and its possible consequences on reef resilience, we conducted a series of experiments with natural rubble maintained under natural or artificial light, and various saturation states of aragonite. We show here that biogenic dissolution of natural reef rubble colonized by microboring communities dominated by the chlorophyte Ostreobium sp., and thus the production of alkalinity in seawater, can occur under a large range of saturation states of aragonite, from 2 to 6.4 under daylight and that this production is directly correlated to the photosynthetic activity of microboring communities. We then discuss the possible implications of such paradoxical activities on reef resilience. 
PY 2022
PD DEC
SO Frontiers In Earth Science
SN 2296-6463
PU Frontiers Media SA
VL 10
UT 000907116800001
DI 10.3389/feart.2022.894501
ID 92499
ER

EF