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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10617 - Marine biology, freshwater biology, limnology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Limnology and Oceanography

ISSN

0024-3590

e-ISSN

—

Svazek periodika

65

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

1149-1160

Kód UT WoS článku

000539986800002

EID výsledku v databázi Scopus

2-s2.0-85074930199