Volatile halocarbon emissions by three tropical brown seaweeds under different irradiances

Keng, Fiona Seh-Lin; Phang, Siew‐Moi; Rahman, Noorsaadah Abd.; Elvidge, Emma Leedham; Hughes, Claire; Robinson, A. D.; Harris, Neil; Pyle, J. A.; Sturges, William T.

doi:10.1007/s10811-013-9990-x

Cited by 38 publications

(54 citation statements)

References 42 publications

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“…It is believed that organic and inorganic halides, in their role as antioxidants, may play a role in mitigating ROS damage (Collén et al, 1994) and therefore the macroalgal adaptation to tidal exposure. In several incubation experiments, production of polyhalogenated compounds was enhanced in the light compared to the dark -evidence that halocarbon emissions could be linked to ROS production during photosynthesis (Collén et al, 1994;Keng et al, 2013;Klick, 1993;Nightingale et al, 1995;Pedersén et al, 1996). Other studies report increased bromocarbon production with the addition of H 2 O 2 (Collén et al, 1994;Küpper et al, 2013) or decreased production with the addition of photosynthesis inhibitors (Goodwin et al, 1997).…”

Section: E C Leedham Elvidge Et Al: the Effect Of Desiccation On Tmentioning

confidence: 99%

The effect of desiccation on the emission of volatile bromocarbons from two common temperate macroalgae

et al. 2015

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Abstract. Exposure of intertidal macroalgae during low tide has been linked to the emission of a variety of atmospherically-important trace gases into the coastal atmosphere. In recent years, several studies have investigated the role of inorganic iodine and organoiodides as antioxidants and their emission during exposure to combat oxidative stress, yet the role of organic bromine species during desiccation is less well understood. In this study the emission of dibromomethane (CH 2 Br 2 ) and bromoform (CHBr 3 ) during exposure and desiccation of two common temperate macroalgae, Fucus vesiculosus and Ulva intestinalis, is reported. Determination of the impact exposure may have on algal physiological processes is difficult as intertidal species are adapted to desiccation and may undergo varying degrees of desiccation before their physiology is affected. For this reason we include comparisons between photosynthetic capacity (F v /F m ) and halocarbon emissions during a desiccation time series. In addition, the role of rewetting with freshwater to simulate exposure to rain was also investigated. Our results show that an immediate flux of bromocarbons occurs upon exposure, followed by a decline in bromocarbon emissions. We suggest that this immediate bromocarbon pulse may be linked to volatilisation or emissions of existing bromocarbon stores from the algal surface rather than the production of bromocarbons as an antioxidant response.

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Section: E C Leedham Elvidge Et Al: the Effect Of Desiccation On Tmentioning

confidence: 99%

The effect of desiccation on the emission of volatile bromocarbons from two common temperate macroalgae

et al. 2015

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“…Kajian terkini ini telah menunjukkan betapa pentingnya bahan berhalogen jangka hayat pendek (VSLS) dan potensi peranan bahan ini terhadap penipisan lapisan ozon (Aschmann et al 2009;Keng et al 2013). Majoriti halokarbon yang dikeluarkan oleh alga laut mempunyai jangka hayat pendek di atmosfera .…”

Section: Pendahuluanunclassified

Kadar Pelepasan Bromokarbon Jangka Hayat Pendek oleh Rumpai Laut Tropika menggunakan Simulasi Laut Tropika

Raynusha¹,

Rozaimi²,

Hidayah³

et al. 2019

JSM

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Macroalgae (seaweeds) are a major contributor in emitting very short-lived (VSL) bromocarbons into the atmosphere especially in tropical countries with high primary productivity such as Malaysia. Abiotic factors such as light intensities and chlorophyll a concentrations can influence the production of bromocarbons emitted by seaweeds, however, not many studies have systematically quantified their influence on the release rates of VSL bromocarbons. Hence, to measure this, we used a seaweed culture system mimicking a natural environment to study the release rate of VSL bromocarbons (CH 2 Br 2 , CHBr 3 and CHBr 2 Cl) for several red, brown and green seaweeds (Gracilaria changii, Ulva reticulata, Caulerpa racemosa var. macrophysa, Kappaphycus alvarezii, Sargassum binderi, Sargassum siliquosum, and Padina australis. The production of VSL bromocarbons showed a diurnal cycle with halocarbon concentrations increasing to a maximum level at mid-day (1738 pmolL -1 ) and decreasing when light intensity and SST decreased. The production of VSL bromocarbons of seaweeds kept in the sunlight is five times higher than the production of aquaculture tanks placed in dark environments indicating the occurrence of photochemical production. The average photochemical rate for VSL bromocarbons from aquaculture tank experiments ranges from 1 to 137 pmol per g -1 FW -1 h -1 . This makes the red seaweeds (Gracilaria changii) as the highest. Likewise, bromoperoxide (BPO) extracted from all seaweeds also showed the highest activity in red seaweed followed by brown and green seaweed.

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“…Green seaweeds like Caulerpa, Ulva harvested from natural populations for use as food, and the brown seaweeds Sargassum and Padina which dominate coral reefs, may also be significant contributors to the halocarbon load in the region. Keng et al (2013) showed that the Malaysian brown seaweeds, Sargassum binderi, Turbinaria conoides and Padina australis had much higher production rates of CH 3 is emitted by all the seaweeds reported and it would be interesting to determine the contributions of farmed versus natural seaweed populations.…”

Section: Halocarbon Emission By Tropical Algaementioning

confidence: 99%

Can Seaweed Farming in the Tropics Contribute to Climate Change Through Emission of Short-Lived Halocarbons?

Phang

Keng²,

Singh³

et al. 2015

MJS

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Volatile halocarbons form a major source of halogen radicals in the atmosphere, which are involved in the catalytic destruction of ozone. Studies show that marine algae release halocarbons, with 70% of global bromoform produced by marine algae . The role of halocarbons in algae is linked to their use as defense against epiphytes and grazing as well as scavengers of strong oxidants (Nightingale et al., 1995). Halocarbon release rates are higher for tropical algae than temperate species (Abrahamsson et al., 1995). The Maritime Continent is a major contributor to emissions of short-lived halocarbons and their transport to the stratosphere due to deep convection. The Coral Triangle situated in the Maritime Continent, is a centre for seaweed farming. The following discusses the potential impact of tropical seaweed emissions of halogenated compounds to climate change. . Peranan halokarbon dalam alga berfungsi sebagai pertahanan terhadap epifit dan 'oxidant scavengers' yang kuat (Nightingale et al., 1995). Kadar pengeluaran halokarbon adalah lebih tinggi untuk alga tropika daripada spesies sederhana (Abrahamsson et al., 1995 ABSTRAK Halokarbon mudah meruap adalah sumber utama radikal halojen dalam atmosfera, yang terlibat dalam pemusnahan lapisan ozon. Kajian menunjukkan bahawa alga melepaskan halokarbon, dan 70% bromoform dihasilkan oleh alga marin

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Volatile halocarbon emissions by three tropical brown seaweeds under different irradiances

Cited by 38 publications

References 42 publications

The effect of desiccation on the emission of volatile bromocarbons from two common temperate macroalgae

The effect of desiccation on the emission of volatile bromocarbons from two common temperate macroalgae

Kadar Pelepasan Bromokarbon Jangka Hayat Pendek oleh Rumpai Laut Tropika menggunakan Simulasi Laut Tropika

Can Seaweed Farming in the Tropics Contribute to Climate Change Through Emission of Short-Lived Halocarbons?

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