The effect of irradiance and temperature on the photosynthesis of an agarophyte, Gelidiella acerosa (Gelidiales, Rhodophyta), from Krabi, Thailand

Fujimoto, Midori; Nishihara, Gregory N.; Prathep, Anchana; Terada, Ryuta

doi:10.1007/s10811-014-0409-0

Cited by 14 publications

(15 citation statements)

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“…Methods for photosynthesis – irradiance ( P–E ) experiment followed those of previous studies (Fujimoto et al ; Vo et al ; Terada et al ,). Seaweed samples were subjected to nine irradiance levels (0, 30, 60, 100, 150, 200, 250, 500 and 1000 μmol photons m − 2 s −1 ) with five replicates, at a fixed temperature of 26°C.…”

Section: Methodsmentioning

confidence: 99%

“…F v /F m of the alga were measured from 8 to 38°C in 2°C increments, with a Maxi Imaging‐PAM (Heinz Walz GmbH, Effeltrich, Germany), as described in previous studies (Fujimoto et al ; Vo et al ; Terada et al ,). Initially, 6–8 cm‐long sections of the thalli of each species were prepared and dark‐acclimated overnight in the incubator at 26°C.…”

Section: Methodsmentioning

confidence: 99%

“…The constant 297.15 is 24°C scaled in absolute temperature. Simultaneous model fittings and determination of model parameters for Equations 2 and 3 were carried out using a Bayesian approach, where the prior distributions for the parameters were determined by averaging the mean and variances of estimates from previous studies (Fujimoto et al ,, ; Kokubu et al ; Vo et al ; Terada et al ,,).

R_{d} = R_{24} italicexp ((),, - \frac{E_{a}}{R} ((),, \frac{1}{K - 297.15}))

…”

Section: Methodsmentioning

confidence: 99%

“…It is of our great interest to evaluate and clarify site‐ and species‐specific response to environmental conditions. Our recent studies using a pulse amplitude modulated (PAM)‐ chlorophyll fluorometer, coupled with dissolved oxygen measurements, revealed the photosynthetic response to temperature and PAR of several freshwater and marine macroalgae (Fujimoto et al ,, ; Kokubu et al ; Vo et al ; Terada et al ,,). For instance, K. alvarezii from Vietnam yielded the highest maximum quantum yield (maximum photochemical efficiency of photosystem II, F v /F m ; Cosgrove & Borowitzka ) of 0.51 at 22.2°C (Terada et al ).…”

Section: Introductionmentioning

confidence: 99%

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Light and temperature effects on photosynthetic activity of Eucheuma denticulatum and Kappaphycus alvarezii (brown and green color morphotypes) from Sulawesi Utara, Indonesia

Borlongan

Gerung

Nishihara

et al. 2016

Phycological Research

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SUMMARY Knowledge concerning the effects of several abiotic factors on the physiology of carrageenophytes is essential both in ecological and economic standpoints, to ensure their sufficient supply for the sustainability of seaweed‐based industries. This paper presents the photosynthetic characteristics of farmed carrageenophytes, E ucheuma denticulatum and K appaphycus alvarezii [brown (BRN) and green (GRN) color morphotypes] from Sulawesi Utara (Sulawesi Island), Indonesia, as determined by examining their photosynthetic response across different temperatures and irradiances using dissolved oxygen measurements and pulse‐amplitude modulated fluorometer. Net photosynthesis–irradiance ( P – E ) curves at 26°C revealed that net photosynthetic rates of the three seaweeds gradually increased until the estimated saturation irradiances ( E k ) of 58 μmol photons m− 2 s−1 (49–68 μmol photons m− 2 s−1, 95% Bayesian prediction intervals; BPI) for E . denticulatum, and 158 and 143 μmol photons m− 2 s−1 (134–185 and 99–203 μmol photons m− 2 s−1, 95% BPI) for BRN and GRN K . alvarezii, respectively; and that no photoinhibition was observed at the highest irradiance of 1000 μmol photons m− 2 s−1. All seaweed samples exhibited photosynthetic tolerance to high PAR as shown by their recovery in maximum quantum yields (Fv / Fm ) following chronic exposures; as well as tolerance over a broad range of temperature, which is from 19 to 33°C for E . denticulatum, 20–29°C for BRN K . alvarezii, and 17–32°C for GRN K . alvarezii. Temperature responses of these carrageenophytes indicated that they were well‐adapted to the annual seawater temperatures in the cultivation site; however, they are also likely close to threshold levels for thermal inhibition, given the decline in Fv / Fm above 30°C.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

R_{d} = R_{24} italicexp ((),, - \frac{E_{a}}{R} ((),, \frac{1}{K - 297.15}))

…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Light and temperature effects on photosynthetic activity of Eucheuma denticulatum and Kappaphycus alvarezii (brown and green color morphotypes) from Sulawesi Utara, Indonesia

Borlongan

Gerung

Nishihara

et al. 2016

Phycological Research

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“…The annual harvests of G. acerosa in the Gulf of Mannar in 2003–2012 yielded 1100–1500 t resulting in 50–90 t of agar (Ganesan et al 2014). G. acerosa is also abundant in areas of the Philippines (Rollon et al 2003) and Thailand (Fujimoto et al 2014), but we were not able to gather any information on a putative harvest. As well, relevant amounts of G. latifolium have been harvested in Indonesia (Soegiarto 1990), picked by hand either at low tide or by snorkeling in shallow waters, but we did not find any time series data on annual landings.…”

Section: Resultsmentioning

confidence: 94%

Global shortage of technical agars: back to basics (resource management)

Santos

Melo

2018

J Appl Phycol

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Bacteriological and technical agars are in short supply with potential consequences for research, public health, and clinical labs around the world. To diagnose bottlenecks and sustainability problems that may be putting the industry at risk, we analyzed the available time series for the global landings of Gelidium, the most important raw materials for the industry. Data on the harvest of Gelidium spp. have been reported since1912, when Japan was the only producer. After World War II the diversification of harvested species and producing countries resulted in a strong increase in global landings. Maximum harvest yields of almost 60,000 t year−1 in the 1960s were sustained until the 1980s, after which landings decreased continuously to the present. In the 2010s, a reduction in the global production to about 25,000 t year−1 was observed, which was lower than the yields of the 1950s. Landings by important producers such as Japan, Korea, Spain, and Portugal have collapsed. This is the ultimate cause of the present shortage of bacteriological and technical agars. However, an important factor at play is the concentration of the global landings of Gelidium in Morocco, as its relative contribution increased from 23% in the 1960s to the present 82%. Two specific bottlenecks were identified: restrictive export quotas of unprocessed Gelidium in favor of the national agar industry and resource management regulations that were apparently not enforced resulting in over-harvesting and resource decline. The global industry may well be dependent on resource management basics. Simple harvest statistics must be gathered such as the harvest effort and the variation of harvest yields along the harvest season. We discuss how this information is fundamental to manage the resource. The available harvest statistics are generally poor and limited and vary significantly among different sources of data. Probable confusions between dry and wet weight reporting and poor discrimination of the species harvested need to be resolved.

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The effect of PAR and temperature on the photosynthetic performance of a freshwater red alga, Thorea gaudichaudii (Thoreales) from Kagoshima, Japan

et al. 2015

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The effect of irradiance and temperature on the photosynthesis of an agarophyte, Gelidiella acerosa (Gelidiales, Rhodophyta), from Krabi, Thailand

Cited by 14 publications

References 47 publications

Light and temperature effects on photosynthetic activity of Eucheuma denticulatum and Kappaphycus alvarezii (brown and green color morphotypes) from Sulawesi Utara, Indonesia

Light and temperature effects on photosynthetic activity of Eucheuma denticulatum and Kappaphycus alvarezii (brown and green color morphotypes) from Sulawesi Utara, Indonesia

Global shortage of technical agars: back to basics (resource management)

The effect of PAR and temperature on the photosynthetic performance of a freshwater red alga, Thorea gaudichaudii (Thoreales) from Kagoshima, Japan

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