Symbiont Photosynthesis and Its Effect on Boron Proxies in Planktic Foraminifera

B?rbel H?nisch; Carina R. Fish; Samuel R. PhelpsLaura L. HaynesKelsey DyezKate HollandJennifer FehrenbacherKatherine A. AllenStephen M. EgginsJoaquim I. Goes

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Symbiont Photosynthesis and Its Effect on Boron Proxies in Planktic Foraminifera

机译：Symbiont Photosynthesis and Its Effect on Boron Proxies in Planktic Foraminifera

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Boron proxies in the calcium carbonate shells of planktic foraminifera are sensitive to seawater acidity, but B/Ca ratios and isotopic composition (i.e., δ~(11)B) recorded by different foraminifer species grown under identical environmental conditions differ significantly and systematically. Specifically, Globigerinoides ruber displays higher B/Ca and δ~(11)B than Trilobatus sacculifer and Orbulina universa. It has been hypothesized that these differences are caused by species-specific rates of symbiont photosynthesis and habitat depth with greater symbiont photosynthesis elevating the microenvironmental pH of G. ruber relative to T. sacculifer and O. universa. Here we test this hypothesis by applying fast repetition rate fluorometry (FRRF), Chlorophyll a quantification, and symbiont counts in laboratory grown specimens of G. ruber (pink), T. sacculifer and O. universa to study species-specific differences in symbiont photochemical quantum efficiencies. In addition, we report B/Ca shell profiles measured by laser ablation on the same specimens previously monitored by FRRF, and δ~(11)B data of discrete populations of all three species grown under high and low light conditions in the laboratory. While the light experiments document that symbiont photosynthesis elevates pH and/or δ~(11)B in the calcifying microenvironment of all three foraminifer species, the FRRF, Chl. a and symbiont abundance data are relatively uniform among the three species and do not scale consistently with intrashell B/Ca, or with observed species-specific offsets in B/Ca or δ~(11)B. Implications of these findings for foraminiferal physiology and biomineralization processes are discussed.

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《Paleoceanography》 |2021年第10期|e2020PA004022-1-e2020PA004022-22|共22页
作者
B?rbel H?nisch; Carina R. Fish; Samuel R. PhelpsLaura L. HaynesKelsey DyezKate HollandJennifer FehrenbacherKatherine A. AllenStephen M. EgginsJoaquim I. Goes;
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作者单位

Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA;

Research School of Earth Sciences, The Australian National University, Canberra, NSW, Australia;

College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA;

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中图分类海洋学;
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Symbiont Photosynthesis; Boron Proxies; Planktic Foraminifera;

Symbiont Photosynthesis and Its Effect on Boron Proxies in Planktic Foraminifera

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