Mineral iron dissolution inTrichodesmiumcolonies: The role of O(2)and pH microenvironments

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388971%3A_____%2F20%3A00531752" target="_blank" >RIV/61388971:_____/20:00531752 - isvavai.cz</a>

Result on the web

<a href="https://aslopubs.onlinelibrary.wiley.com/doi/full/10.1002/lno.11377" target="_blank" >https://aslopubs.onlinelibrary.wiley.com/doi/full/10.1002/lno.11377</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/lno.11377" target="_blank" >10.1002/lno.11377</a>

Result language

angličtina

Original language name

Mineral iron dissolution inTrichodesmiumcolonies: The role of O(2)and pH microenvironments

Original language description

Colonies of the N-2-fixing cyanobacteriumTrichodesmiumcan harbor distinct chemical microenvironments that may assist the colonies in acquiring mineral iron from dust. Here, we characterized O(2)and pH gradients in and aroundTrichodesmiumcolonies by microsensor measurements on > 170 colonies collected in the Gulf of Eilat over similar to 2 months. O(2)concentrations and pH values in the center of single colonies decreased in the dark due to respiration, reaching minimum values of 70 mu mol L(-1)and 7.7, whereas in the light, O(2)and pH increased due to photosynthesis, reaching maximum values of 410 mu mol L(-1)and 8.6. Addition of dust and bacteria and increasing colony size influenced O(2)and pH levels in the colonies, yet values remained within the range observed in single natural colonies. However, lower values down to 60 mu mol L(-1)O(2)and pH 7.5 were recorded in the dark in dense surface accumulations ofTrichodesmium. Using radiolabelled ferrihydrite, we examined the effect of these conditions on mineral iron dissolution and availability toTrichodesmium. Dark-incubated colonies did not acquire iron from ferrihydrite faster than light-incubated colonies, indicating that the dark-induced decrease in pH and O(2)within single colonies is too small to significantly increase mineral iron bioavailability. Yet, ligand-promoted dissolution of ferrihydrite, a mechanism likely applied byTrichodesmumfor acquiring mineral iron, did increase at the lower pH levels observed in surface accumulations. Thus,Trichodesmiumsurface blooms in their final stage may harbor chemical conditions that enhance the dissolution and bioavailability of mineral iron to the associated microbial community.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10617 - Marine biology, freshwater biology, limnology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Limnology and Oceanography

ISSN

0024-3590

e-ISSN

—

Volume of the periodical

65

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

12

Pages from-to

1149-1160

UT code for WoS article

000539986800002

EID of the result in the Scopus database

2-s2.0-85074930199