Effect of irradiance on the emission of short-lived halocarbons from three common tropical marine microalgae

Lim, Yong Kian, Keng, Fiona Seh Lin, Phang, Siew Moi, Sturges, William T. ORCID: https://orcid.org/0000-0002-9044-7169, Malin, Gill ORCID: https://orcid.org/0000-0002-3639-9215 and Rahman, Noorsaadah Abd (2019) Effect of irradiance on the emission of short-lived halocarbons from three common tropical marine microalgae. PeerJ, 2019 (4). ISSN 2167-8359

[thumbnail of Published_Version]
PDF (Published_Version) - Published Version
Available under License Creative Commons Attribution.

Download (386kB) | Preview


Marine algae have been reported as important sources of biogenic volatile halocarbons that are emitted into the atmosphere. These compounds are linked to destruction of the ozone layer, thus contributing to climate change. There may be mutual interactions between the halocarbon emission and the environment. In this study, the effect of irradiance on the emission of halocarbons from selected microalgae was investigated. Using controlled laboratory experiments, three tropical marine microalgae cultures, Synechococcus sp. UMACC 371 (cyanophyte), Parachlorella sp. UMACC 245 (chlorophyte) and Amphora sp. UMACC 370 (diatom) were exposed to irradiance of 0, 40 and 120 µmol photons m−2s−1. Stress in the microalgal cultures was indicated by the photosynthetic performance (Fv/Fm, maximum quantum yield). An increase in halocarbon emissions was observed at 120 µmol photons m−2s−1, together with a decrease in Fv/Fm. This was most evident in the release of CH3I by Amphora sp. Synechococcus sp. was observed to be the most affected by irradiance as shown by the increase in emissions of most halocarbons except for CHBr3 and CHBr2Cl. High positive correlation between Fv/Fm and halocarbon emission rates was observed in Synechococcus sp. for CH2Br2. No clear trends in correlation could be observed for the other halocarbons in the other two microalgal species. This suggests that other mechanisms like mitochondria respiration may contribute to halocarbon production, in addition to photosynthetic performance.

Item Type: Article
Uncontrolled Keywords: environmental change,halocarbon emission,irradiance,marine microalgae,tropics,neuroscience(all),biochemistry, genetics and molecular biology(all),agricultural and biological sciences(all),sdg 13 - climate action,sdg 14 - life below water ,/dk/atira/pure/subjectarea/asjc/2800
Faculty \ School: Faculty of Science > School of Environmental Sciences
UEA Research Groups: Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 08 Nov 2019 11:30
Last Modified: 13 Apr 2023 13:57
URI: https://ueaeprints.uea.ac.uk/id/eprint/72912
DOI: 10.7717/peerj.6758


Downloads per month over past year

Actions (login required)

View Item View Item