daily variation in net primary production and net calcification in coral reef communities exposed to elevated pco2
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2017
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Abstract
The threat represented by ocean acidification (OA) for coral reefs has
received considerable attention because of the sensitivity of calcifiers to
changing seawater carbonate chemistry. However, most studies have focused on
the organismic response of calcification to OA, and only a few have addressed
community-level effects, or investigated parameters other than calcification,
such as photosynthesis. Light (photosynthetically active radiation, PAR) is a
driver of biological processes on coral reefs, and the possibility that these
processes might be perturbed by OA has important implications for community
function. Here we investigate how CO2 enrichment affects the
relationships between PAR and community net O2 production
(Pnet), and between PAR and community net calcification
(Gnet), using experiments on three coral communities constructed
to match (i) the back reef of Mo'orea, French Polynesia, (ii) the fore reef
of Mo'orea, and (iii) the back reef of O'ahu, Hawaii. The results were used
to test the hypothesis that OA affects the relationship between Pnet and Gnet. For the three communities tested,
pCO2 did not affect the Pnet–PAR relationship, but it
affected the intercept of the hyperbolic tangent curve fitting the
Gnet–PAR relationship for both reef communities in Mo'orea (but
not in O'ahu). For the three communities, the slopes of the linear
relationships between Pnet and Gnet were not affected
by OA, although the intercepts were depressed by the inhibitory effect of
high pCO2 on Gnet. Our result indicates that OA can
modify the balance between net calcification and net photosynthesis of reef
communities by depressing community calcification, but without affecting
community photosynthesis.
| Reference Key |
comeau2017biogeosciencesdaily
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|---|---|
| Authors | ;S. Comeau;S. Comeau;P. J. Edmunds;C. A. Lantz;C. A. Lantz;R. C. Carpenter |
| Journal | tetrahedron letters |
| Year | 2017 |
| DOI |
10.5194/bg-14-3549-2017
|
| URL | |
| Keywords |
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