OZONE LOSS
; BROMOFORM
; PHOTOINHIBITION
; BROMINE
; CLIMATE
; PHOTOPROTECTION
; STRATOSPHERE
; HYDROCARBONS
; SUBSTANCES
; TRANSPORT
WOS学科分类:
Multidisciplinary Sciences
WOS研究方向:
Science & Technology - Other Topics
英文摘要:
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 mu mol photons ms(-2)s(-1). Stress in the microalgal cultures was indicated by the photosynthetic performance (F-v/F-m, maximum quantum yield). An increase in halocarbon emissions was observed at 120 mu mol photons ms(-1), together with a decrease in F-v/F-m. 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 F-v/F-m 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.
1.Univ Malaya, Inst Ocean & Earth Sci, Kuala Lumpur, Malaysia 2.Univ Malaya, Inst Grad Studies IPS, Kuala Lumpur, Malaysia 3.Univ Hong Kong, Swire Inst Marine Sci, Hong Kong, Peoples R China 4.Univ Hong Kong, Sch Biol Sci, Hong Kong, Peoples R China 5.Univ Malaya, Fac Sci, Inst Biol Sci, Kuala Lumpur, Malaysia 6.Univ East Anglia, Ctr Ocean & Atmospher Sci, Sch Environm Sci, Norwich, Norfolk, England 7.Univ Malaya, Fac Sci, Dept Chem, Kuala Lumpur, Malaysia
Recommended Citation:
Lim, Yong-Kian,Keng, Fiona Seh-Lin,Phang, Siew-Moi,et al. Effect of irradiance on the emission of short-lived halocarbons from three common tropical marine microalgae[J]. PEERJ,2019-01-01,7