Temperature and salinity responses of drifting specimens of Kappaphycus alvarezii (Gigartinales, Rhodophyta) farmed on the Brazilian tropical coast

Araújo, Patrícia Guimarães; Ribeiro, Ana Lívia N. L.; Yokoya, Nair S.; Fujii, Mutuê T.

doi:10.1007/s10811-014-0303-9

Cited by 25 publications

(6 citation statements)

References 29 publications

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“…alvarezii (formerly known as Eucheuma cottonii ) [ 6 ]. Our present study, which showed that seaweeds incubated at 32, 36 and 40°C produced significantly lower carrageenan yield compared to seaweeds incubated at 28°C, corroborate with previous studies [ 53 – 55 ], which reported that incubation of seaweeds beyond conducive temperature lowers their gel strength and gel viscosity. According Campo et al .…”

Section: Discussionsupporting

confidence: 93%

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Impact of elevated temperature on the physiological and biochemical responses of Kappaphycus alvarezii (Rhodophyta)

et al. 2020

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The eucheumatoids Kappaphycus and Eucheuma are cultivated in tropical or subtropical regions for the production of carrageenan, a hydrocolloid widely used in the food and cosmetic industries. Kappaphycus alvarezii is a highly valued economic crop in the Coral Triangle, with the Philippines, Indonesia and Malaysia ranked among the largest producers. In the absence of measures to mitigate climate change, extreme events including heatwaves, typhoons, severe El Niño and La Niña, are expected to increase in frequency and magnitude. This inadvertently brings adverse effects to the seaweed cultivation industry, especially in the tropics. Temperatures are rapidly reaching the upper limit of biologically tolerable levels and an increase in reports of ice-ice and pest outbreaks is attributable to these shifts of environmental parameters. Nevertheless, few reports on the response of eucheumatoids to a changing environment, in particular global warming, are available. Understanding the responses and possible mechanisms for acclimation to warming is crucial for a sustainable seaweed cultivation industry. Here, the physiological and biochemical responses of K . alvarezii to acute warming indicated that the strain used in the current study is unlikely to survive sudden increases in temperature above 36°C. As temperature increased, the growth rates, photosynthetic performance, phycocolloid quality (carrageenan yield, gel strength and gel viscosity) and pigment content (chlorophyll- a , carotenoid and phycobiliproteins) were reduced while the production of reactive oxygen species increased indicating the occurrence of stress in the seaweeds. This study provides a basis for future work on long term acclimation to elevated temperature and mesocosm-based multivariate studies to identify heat-tolerant strains for sustainable cultivation.

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Section: Discussionsupporting

confidence: 93%

“…Phycobiliprotein (allophycocyanin, phycocyanin and phycoerythrin) content was the highest in strains incubated at 28°C and similar findings were observed by Araújo et al . [ 53 ] for red and brown variants of K . alvarezii .…”

Section: Discussionmentioning

confidence: 99%

Impact of elevated temperature on the physiological and biochemical responses of Kappaphycus alvarezii (Rhodophyta)

et al. 2020

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“…Data are included from the prokaryotic cyanobacteria, haptophytes, diatoms, brown algae to green algae (fresh water, snow algae and marine species and Phycodrys austrogeorgica (Poppe et al 2003) stressed by ultraviolet radiation. At high salinities, the chlorophyll concentration was also low in K. alvarezii (Araújo et al 2014).…”

Section: Discussionmentioning

confidence: 96%

Effects of salinity on the physiology of the red macroalga, Acanthophora spicifera (Rhodophyta, Ceramiales)

et al. 2017

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Salinity is an important abiotic factor since it is responsible for the local and/or regional distribution of algae. In coastal regions, salinity changes with prevailing winds, precipitation and tide, and particularly in extreme intertidal conditions. Acanthophora spicifera is a red seaweed that occurs in the supratidal region in which changes in abiotic conditions occur frequently. Th is study evaluated the eff ects of salinity on the metabolism and morphology of A. spicifera. Algae were acclimatized under culture conditions with sterilized seawater for seven days. Experiments used diff erent salinities (15 to 50 psu) for seven days, followed by metabolic analyses. Th is study demonstrates that extreme salinities aff ect physiological parameters of A. spicifera, such as decrease in growth rate, as well as morphological parameters and concentrations of secondary metabolites. Acanthophora spicifera exhibited high tolerance to 25 to 40 psu, with little change in physiology, which favors the occurrence of this species in diverse environments. However, 15, 20, 45 and 50 psu were the most damaging and led to loss of biomass, depigmentation of apices, and the highest concentrations of antioxidant metabolites. Th e 50 psu treatment caused the greatest changes in general, greatly reducing a biomass and chlorophyll content, and facilitating the presence of endophytes.

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“…For tropical marine macroalgae, lethal and sublethal temperatures have been recorded between 32 °C and 38 °C (Koch et al 2013) (e.g. Miranda et al 2012;Araújo et al 2014;Castro & Yokoya 2019). The maximum temperature tested in this study (32 °C) was not lethal for either species, although their lowest growth was recorded at this temperature.…”

Section: Discussionmentioning

confidence: 99%

Effects of ocean warming, eutrophication and salinity variations on the growth of habitat-forming macroalgae in estuarine environments

2020

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Global change and coastal eutrophication are affecting macroalgae worldwide. We analyzed the effects of increased water temperature (25, 28 and 32 °C) and eutrophication on the growth of Bostrychia binderi and Bostrychia montagnei in a range of salinities (18, 24, 30, 36 and 42 PSU) through three independent multifactorial experiments. Both species had higher growth at 25 °C than at 28 and 32 °C (warming scenario projected by IPCC), suggesting a negative effect of ocean warming. The species showed a broad tolerance to the range of salinities tested, with higher growth at 36 and 42 PSU, as a local adaptation strategy. Oligotrophic seawater significantly affected the growth of both species because the lowest growth was found in this condition, whereas highest growth was found with increased availability of nutrients, which is probably because estuaries are nutrient-rich environments due to continental runoff. High temperatures, low salinities and few nutrients had negative interactive effects on the growth of both species. Our results show that ocean warming can be detrimental to the studied macroalgae, and that both species are tolerant to eutrophication, with B. montagnei being more sensitive than B. binderi. Our results also reinforce the euryhaline characteristic of the genus Bostrychia.

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Temperature and salinity responses of drifting specimens of Kappaphycus alvarezii (Gigartinales, Rhodophyta) farmed on the Brazilian tropical coast

Cited by 25 publications

References 29 publications

Impact of elevated temperature on the physiological and biochemical responses of Kappaphycus alvarezii (Rhodophyta)

Impact of elevated temperature on the physiological and biochemical responses of Kappaphycus alvarezii (Rhodophyta)

Effects of salinity on the physiology of the red macroalga, Acanthophora spicifera (Rhodophyta, Ceramiales)

Effects of ocean warming, eutrophication and salinity variations on the growth of habitat-forming macroalgae in estuarine environments

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