Asset Details
Do you wish to reserve the book?
Phycosphere pH of unicellular nano- and micro- phytoplankton cells and consequences for iron speciation
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
Phycosphere pH of unicellular nano- and micro- phytoplankton cells and consequences for iron speciation
Do you wish to request the book?
Phycosphere pH of unicellular nano- and micro- phytoplankton cells and consequences for iron speciation
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Journal Article
Phycosphere pH of unicellular nano- and micro- phytoplankton cells and consequences for iron speciation
2022
Overview
Surface ocean pH is declining due to anthropogenic atmospheric CO
2
uptake with a global decline of ~0.3 possible by 2100. Extracellular pH influences a range of biological processes, including nutrient uptake, calcification and silicification. However, there are poor constraints on how pH levels in the extracellular microenvironment surrounding phytoplankton cells (the phycosphere) differ from bulk seawater. This adds uncertainty to biological impacts of environmental change. Furthermore, previous modelling work suggests that phycosphere pH of small cells is close to bulk seawater, and this has not been experimentally verified. Here we observe under 140 μmol photons·m
−2
·s
−1
the phycosphere pH of
Chlamydomonas concordia
(5 µm diameter),
Emiliania huxleyi
(5 µm),
Coscinodiscus radiatus
(50 µm) and
C. wailesii
(100 µm) are 0.11 ± 0.07, 0.20 ± 0.09, 0.41 ± 0.04 and 0.15 ± 0.20 (mean ± SD) higher than bulk seawater (pH 8.00), respectively. Thickness of the pH boundary layer of
C. wailesii
increases from 18 ± 4 to 122 ± 17 µm when bulk seawater pH decreases from 8.00 to 7.78. Phycosphere pH is regulated by photosynthesis and extracellular enzymatic transformation of bicarbonate, as well as being influenced by light intensity and seawater pH and buffering capacity. The pH change alters Fe speciation in the phycosphere, and hence Fe availability to phytoplankton is likely better predicted by the phycosphere, rather than bulk seawater. Overall, the precise quantification of chemical conditions in the phycosphere is crucial for assessing the sensitivity of marine phytoplankton to ongoing ocean acidification and Fe limitation in surface oceans.
Publisher
Nature Publishing Group UK,Oxford University Press
Subject
/ 9/10
/ Biomedical and Life Sciences
/ Ecology
/ Iron
/ Microbial Genetics and Genomics
/ Oceans
/ Photons
/ Plankton
/ Seawater
