ORCID Profile
0000-0002-3043-3806
Current Organisation
University of Miami
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Publisher: Springer Science and Business Media LLC
Date: 04-06-2008
Publisher: Wiley
Date: 30-07-2018
DOI: 10.1002/LNO.10952
Publisher: Springer Science and Business Media LLC
Date: 26-09-2019
Publisher: American Geophysical Union (AGU)
Date: 09-2007
DOI: 10.1029/2006GL027288
Publisher: American Geophysical Union (AGU)
Date: 04-2005
DOI: 10.1029/2004GL022329
Publisher: Wiley
Date: 03-2011
Publisher: Proceedings of the National Academy of Sciences
Date: 08-11-2010
Abstract: Ocean acidification (OA) refers to the ongoing decline in oceanic pH resulting from the uptake of atmospheric CO 2 . Mounting experimental evidence suggests that OA will have negative consequences for a variety of marine organisms. Whereas the effect of OA on the calcification of adult reef corals is increasingly well documented, effects on early life history stages are largely unknown. Coral recruitment, which necessitates successful fertilization, larval settlement, and postsettlement growth and survivorship, is critical to the persistence and resilience of coral reefs. To determine whether OA threatens successful sexual recruitment of reef-building corals, we tested fertilization, settlement, and postsettlement growth of Acropora palmata at p CO 2 levels that represent average ambient conditions during coral spawning (∼400 μatm) and the range of p CO 2 increases that are expected to occur in this century [∼560 μatm (mid-CO 2 ) and ∼800 μatm (high-CO 2 )]. Fertilization, settlement, and growth were all negatively impacted by increasing p CO 2 , and impairment of fertilization was exacerbated at lower sperm concentrations. The cumulative impact of OA on fertilization and settlement success is an estimated 52% and 73% reduction in the number of larval settlers on the reef under p CO 2 conditions projected for the middle and the end of this century, respectively. Additional declines of 39% (mid-CO 2 ) and 50% (high-CO 2 ) were observed in postsettlement linear extension rates relative to controls. These results suggest that OA has the potential to impact multiple, sequential early life history stages, thereby severely compromising sexual recruitment and the ability of coral reefs to recover from disturbance.
Publisher: Elsevier BV
Date: 09-2012
Publisher: Copernicus GmbH
Date: 28-10-2013
Abstract: Abstract. Ocean acidification is projected to shift coral reefs from a state of net accretion to one of net dissolution this century. Presently, our ability to predict global-scale changes to coral reef calcification is limited by insufficient data relating seawater carbonate chemistry parameters to in situ rates of reef calcification. Here, we investigate diel and seasonal trends in carbonate chemistry of the Davies Reef flat in the central Great Barrier Reef and relate these trends to benthic carbon fluxes by quantifying net ecosystem calcification (nec) and net community production (ncp). Results show that seawater carbonate chemistry of the Davies Reef flat is highly variable over both diel and seasonal cycles. pH (total scale) ranged from 7.92 to 8.17, pCO2 ranged from 272 to 542 μatm, and aragonite saturation state (Ωarag) ranged from 2.9 to 4.1. Diel cycles in carbonate chemistry were primarily driven by ncp, and warming explained 35% and 47% of the seasonal shifts in pCO2 and pH, respectively. Daytime ncp averaged 37 ± 19 mmol C m−2 h−1 in summer and 33 ± 13 mmol C m−2 h−1 in winter nighttime ncp averaged −30 ± 25 and −7 ± 6 mmol C m−2 h−1 in summer and winter, respectively. Daytime nec averaged 11 ± 4 mmol CaCO3 m−2 h−1 in summer and 8 ± 3 mmol CaCO3 m−2 h−1 in winter, whereas nighttime nec averaged 2 ± 4 mmol and −1 ± 3 mmol CaCO3 m−2 h−1 in summer and winter, respectively. Net ecosystem calcification was highly sensitive to changes in Ωarag for both seasons, indicating that relatively small shifts in Ωarag may drive measurable shifts in calcification rates, and hence carbon budgets, of coral reefs throughout the year.
Publisher: Springer Science and Business Media LLC
Date: 29-05-2011
DOI: 10.1038/NCLIMATE1122
No related grants have been discovered for Chris Langdon.