 |
| Titel |
pH up-regulation as a potential mechanism for the cold-water coral Lophelia pertusa to sustain growth in aragonite undersaturated conditions |
| VerfasserIn |
M. Wall, F. Ragazzola, L. C. Foster, A. Form, D. N. Schmidt |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 23 ; Nr. 12, no. 23 (2015-12-01), S.6869-6880 |
| Datensatznummer |
250118187
|
| Publikation (Nr.) |
 copernicus.org/bg-12-6869-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| Cold-water corals are important habitat formers in deep-water ecosystems and
at high latitudes. Ocean acidification and the resulting change in aragonite
saturation are expected to affect these habitats and impact coral growth.
Counter to expectations, the deep water coral Lophelia pertusa has
been found to be able to sustain growth even in undersaturated conditions.
However, it is important to know whether such undersaturation modifies the
skeleton and thus its ecosystem functioning. Here we used Synchrotron
X-Ray Tomography and Raman spectroscopy to examine changes in skeleton
morphology and fibre orientation. We combined the morphological assessment
with boron isotope analysis to determine if changes in growth are related to
changes in control of calcification pH. We compared the isotopic composition
and structure formed in their natural environment to material grown in
culture at lower pH conditions. Skeletal morphology is highly variable but
shows no distinctive differences between natural and low pH conditions. Raman
investigations found no difference in macromorphological skeletal arrangement
of early mineralization zones and secondary thickening between the
treatments. The δ11B analyses show that L. pertusa
up-regulates the internal calcifying fluid pH (pHcf) during
calcification compared to ambient seawater pH and maintains a similar elevated
pHcf at increased pCO2 conditions. We suggest that as long
as the energy is available to sustain the up-regulation, i.e. individuals are
well fed, there is no detrimental effect to the skeletal morphology. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|