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Yukio Agatsuma - One of the best experts on this subject based on the ideXlab platform.
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interactive effects of Nutrient Availability temperature and irradiance on photosynthetic pigments and color of the brown alga undaria pinnatifida
Journal of Applied Phycology, 2017Co-Authors: Hikaru Endo, Yutaka Okumura, Yoichi Sato, Yukio AgatsumaAbstract:Color is one of the important factors that determine the commercial value of cultivated marine macroalgae such as the brown alga Undaria pinnatifida (Laminariales; Phaeophyta) in Japan. Macroalgal color is fundamentally derived from the algal photosynthetic pigment content, which is affected by abiotic factors. However, little is known about the quantitative relationship between pigment content and color and the direct effects of abiotic factors on the color of marine macroalgae. We conducted a 24-day indoor culture experiment to assess the combined effects of Nutrient Availability (enriched and nonenriched seawater), seawater temperature (15 and 5 °C), and irradiance (180 and 30 μmol photons m−2 s−1) on the concentrations of six pigments (chlorophyll (Chl) a, Chl c1, Chl c2, fucoxanthin, violaxanthin, and zeaxanthin) and three color values (lightness L*, redness a*, and yellowness b*) of U. pinnatifida sporophytes. Negative correlations between pigment content and color values of the cultured algae were detected. Reduced Nutrient Availability, decrease in temperature, and elevated irradiance resulted in decreased pigment contents and increased color values. Moreover, a significant interaction between Nutrient Availability and temperature indicated that the positive effect of Nutrient enrichment was antagonized by a decrease in temperature. These results suggest that U. pinnatifida can discolor under Nutrient-poor, winter temperature, and saturated irradiance conditions. To increase the commercial value of this species, artificial Nutrient enrichment during spring or cultivation from a deeper depth may be effective.
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interactive effects of Nutrient Availability and temperature on growth and survival of different size classes of saccharina japonica laminariales phaeophyceae
Phycologia, 2017Co-Authors: Xu Gao, Hikaru Endo, Michiko Nagaki, Yukio AgatsumaAbstract:In northern Japan, the production of Saccharina japonica exhibits marked annual fluctuation due to changes in seawater temperature and Nutrient Availability during winter and spring. To better unde...
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Interactive effects of Nutrient Availability and temperature on growth and survival of different size classes of Saccharina japonica (Laminariales, Phaeophyceae)
Phycologia, 2017Co-Authors: Xu Gao, Hikaru Endo, Michiko Nagaki, Yukio AgatsumaAbstract:Abstract: In northern Japan, the production of Saccharina japonica exhibits marked annual fluctuation due to changes in seawater temperature and Nutrient Availability during winter and spring. To better understand this phenomenon, we examined the combined effects of temperature (5°C, 10°C, 15°C and 20°C) and Nutrient Availability (seawater enriched with 25% Provasoli's enriched seawater vs nonenriched seawater) on photosynthesis, growth and survival and nitrogen and chlorophyll a contents of juvenile sporophytes (2–3 cm) and larger size class sporophytes (100–150 cm) from southern Hokkaido. Both juvenile sporophytes and discs from 100–150-cm-class sporophytes cultured in enriched seawater showed significantly higher growth rates and photosynthetic activities than those cultured in nonenriched seawater. This difference likely was due to the significantly higher nitrogen and chlorophyll a contents of thalli grown in enriched seawater. Significant effects of temperature on growth and photosynthesis were also...
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Open Access AJPS Combined Effects of Temperature and Nutrient Availability on Growth and Phlorotannin Concentration of the Brown Alga Sargassum patens (Fucales; Phaeophyceae)
2016Co-Authors: Hikaru Endo, Kentaro Suehiro, Junji Kinoshita, Xu Gao, Yukio AgatsumaAbstract:Copyright © 2013 Hikaru Endo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Global warming is predicted to affect plant-herbivore interactions. However, little is known about the effects of tem-perature on marine plant secondary chemistry and how these effects may impact plant-herbivore interactions. As marine macroalgae can become physiologically stressed due to warm water temperatures and Nutrient-poor conditions during summer, we conducted a culture experiment to test the combined effects of temperature (10˚C, 20˚C, 30˚C) and Nutrient Availability (seawater enriched with 25 % PESI medium and non-enriched seawater) on relative growth rate (RGR) and concentration of phlorotannins (i.e., defensive compounds) in the upper and lower parts of shoots of the brown alga Sargassum patens. RGR was affected by temperature but not by Nutrient Availability. Phlorotannnin concentration was affected by Nutrient Availability but not by temperature, although there was a significant interaction between tempera-ture and part of the shoots. Correlations between RGR and phlorotannin concentration were significant for the upper part of the shoots but not for the lower part. These correlations were slightly positive in the Nutrient-enriched medium but negative in the non-enriched medium. These results suggest that temperature affects phlorotannin concentration of S. patens indirectly via changes in the growth rate and that its effect depends on the part of the shoot and Nutrient avail
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combined effects of temperature and Nutrient Availability on growth and phlorotannin concentration of the brown alga sargassum patens fucales phaeophyceae
American Journal of Plant Sciences, 2013Co-Authors: Hikaru Endo, Kentaro Suehiro, Junji Kinoshita, Xu Gao, Yukio AgatsumaAbstract:Global warming is predicted to affect plant-herbivore interactions. However, little is known about the effects of temperature on marine plant secondary chemistry and how these effects may impact plant-herbivore interactions. As marine macroalgae can become physiologically stressed due to warm water temperatures and Nutrient-poor conditions during summer, we conducted a culture experiment to test the combined effects of temperature (10˚C, 20˚C, 30˚C) and Nutrient Availability (seawater enriched with 25% PESI medium and non-enriched seawater) on relative growth rate (RGR) and concentration of phlorotannins (i.e., defensive compounds) in the upper and lower parts of shoots of the brown alga Sargassum patens. RGR was affected by temperature but not by Nutrient Availability. Phlorotannnin concentration was affected by Nutrient Availability but not by temperature, although there was a significant interaction between temperature and part of the shoots. Correlations between RGR and phlorotannin concentration were significant for the upper part of the shoots but not for the lower part. These correlations were slightly positive in the Nutrient-enriched medium but negative in the non-enriched medium. These results suggest that temperature affects phlorotannin concentration of S. patens indirectly via changes in the growth rate and that its effect depends on the part of the shoot and Nutrient Availability.
Hikaru Endo - One of the best experts on this subject based on the ideXlab platform.
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interactive effects of Nutrient Availability temperature and irradiance on photosynthetic pigments and color of the brown alga undaria pinnatifida
Journal of Applied Phycology, 2017Co-Authors: Hikaru Endo, Yutaka Okumura, Yoichi Sato, Yukio AgatsumaAbstract:Color is one of the important factors that determine the commercial value of cultivated marine macroalgae such as the brown alga Undaria pinnatifida (Laminariales; Phaeophyta) in Japan. Macroalgal color is fundamentally derived from the algal photosynthetic pigment content, which is affected by abiotic factors. However, little is known about the quantitative relationship between pigment content and color and the direct effects of abiotic factors on the color of marine macroalgae. We conducted a 24-day indoor culture experiment to assess the combined effects of Nutrient Availability (enriched and nonenriched seawater), seawater temperature (15 and 5 °C), and irradiance (180 and 30 μmol photons m−2 s−1) on the concentrations of six pigments (chlorophyll (Chl) a, Chl c1, Chl c2, fucoxanthin, violaxanthin, and zeaxanthin) and three color values (lightness L*, redness a*, and yellowness b*) of U. pinnatifida sporophytes. Negative correlations between pigment content and color values of the cultured algae were detected. Reduced Nutrient Availability, decrease in temperature, and elevated irradiance resulted in decreased pigment contents and increased color values. Moreover, a significant interaction between Nutrient Availability and temperature indicated that the positive effect of Nutrient enrichment was antagonized by a decrease in temperature. These results suggest that U. pinnatifida can discolor under Nutrient-poor, winter temperature, and saturated irradiance conditions. To increase the commercial value of this species, artificial Nutrient enrichment during spring or cultivation from a deeper depth may be effective.
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interactive effects of Nutrient Availability and temperature on growth and survival of different size classes of saccharina japonica laminariales phaeophyceae
Phycologia, 2017Co-Authors: Xu Gao, Hikaru Endo, Michiko Nagaki, Yukio AgatsumaAbstract:In northern Japan, the production of Saccharina japonica exhibits marked annual fluctuation due to changes in seawater temperature and Nutrient Availability during winter and spring. To better unde...
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Interactive effects of Nutrient Availability and temperature on growth and survival of different size classes of Saccharina japonica (Laminariales, Phaeophyceae)
Phycologia, 2017Co-Authors: Xu Gao, Hikaru Endo, Michiko Nagaki, Yukio AgatsumaAbstract:Abstract: In northern Japan, the production of Saccharina japonica exhibits marked annual fluctuation due to changes in seawater temperature and Nutrient Availability during winter and spring. To better understand this phenomenon, we examined the combined effects of temperature (5°C, 10°C, 15°C and 20°C) and Nutrient Availability (seawater enriched with 25% Provasoli's enriched seawater vs nonenriched seawater) on photosynthesis, growth and survival and nitrogen and chlorophyll a contents of juvenile sporophytes (2–3 cm) and larger size class sporophytes (100–150 cm) from southern Hokkaido. Both juvenile sporophytes and discs from 100–150-cm-class sporophytes cultured in enriched seawater showed significantly higher growth rates and photosynthetic activities than those cultured in nonenriched seawater. This difference likely was due to the significantly higher nitrogen and chlorophyll a contents of thalli grown in enriched seawater. Significant effects of temperature on growth and photosynthesis were also...
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Open Access AJPS Combined Effects of Temperature and Nutrient Availability on Growth and Phlorotannin Concentration of the Brown Alga Sargassum patens (Fucales; Phaeophyceae)
2016Co-Authors: Hikaru Endo, Kentaro Suehiro, Junji Kinoshita, Xu Gao, Yukio AgatsumaAbstract:Copyright © 2013 Hikaru Endo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Global warming is predicted to affect plant-herbivore interactions. However, little is known about the effects of tem-perature on marine plant secondary chemistry and how these effects may impact plant-herbivore interactions. As marine macroalgae can become physiologically stressed due to warm water temperatures and Nutrient-poor conditions during summer, we conducted a culture experiment to test the combined effects of temperature (10˚C, 20˚C, 30˚C) and Nutrient Availability (seawater enriched with 25 % PESI medium and non-enriched seawater) on relative growth rate (RGR) and concentration of phlorotannins (i.e., defensive compounds) in the upper and lower parts of shoots of the brown alga Sargassum patens. RGR was affected by temperature but not by Nutrient Availability. Phlorotannnin concentration was affected by Nutrient Availability but not by temperature, although there was a significant interaction between tempera-ture and part of the shoots. Correlations between RGR and phlorotannin concentration were significant for the upper part of the shoots but not for the lower part. These correlations were slightly positive in the Nutrient-enriched medium but negative in the non-enriched medium. These results suggest that temperature affects phlorotannin concentration of S. patens indirectly via changes in the growth rate and that its effect depends on the part of the shoot and Nutrient avail
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combined effects of temperature and Nutrient Availability on growth and phlorotannin concentration of the brown alga sargassum patens fucales phaeophyceae
American Journal of Plant Sciences, 2013Co-Authors: Hikaru Endo, Kentaro Suehiro, Junji Kinoshita, Xu Gao, Yukio AgatsumaAbstract:Global warming is predicted to affect plant-herbivore interactions. However, little is known about the effects of temperature on marine plant secondary chemistry and how these effects may impact plant-herbivore interactions. As marine macroalgae can become physiologically stressed due to warm water temperatures and Nutrient-poor conditions during summer, we conducted a culture experiment to test the combined effects of temperature (10˚C, 20˚C, 30˚C) and Nutrient Availability (seawater enriched with 25% PESI medium and non-enriched seawater) on relative growth rate (RGR) and concentration of phlorotannins (i.e., defensive compounds) in the upper and lower parts of shoots of the brown alga Sargassum patens. RGR was affected by temperature but not by Nutrient Availability. Phlorotannnin concentration was affected by Nutrient Availability but not by temperature, although there was a significant interaction between temperature and part of the shoots. Correlations between RGR and phlorotannin concentration were significant for the upper part of the shoots but not for the lower part. These correlations were slightly positive in the Nutrient-enriched medium but negative in the non-enriched medium. These results suggest that temperature affects phlorotannin concentration of S. patens indirectly via changes in the growth rate and that its effect depends on the part of the shoot and Nutrient Availability.
Xu Gao - One of the best experts on this subject based on the ideXlab platform.
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interactive effects of Nutrient Availability and temperature on growth and survival of different size classes of saccharina japonica laminariales phaeophyceae
Phycologia, 2017Co-Authors: Xu Gao, Hikaru Endo, Michiko Nagaki, Yukio AgatsumaAbstract:In northern Japan, the production of Saccharina japonica exhibits marked annual fluctuation due to changes in seawater temperature and Nutrient Availability during winter and spring. To better unde...
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Interactive effects of Nutrient Availability and temperature on growth and survival of different size classes of Saccharina japonica (Laminariales, Phaeophyceae)
Phycologia, 2017Co-Authors: Xu Gao, Hikaru Endo, Michiko Nagaki, Yukio AgatsumaAbstract:Abstract: In northern Japan, the production of Saccharina japonica exhibits marked annual fluctuation due to changes in seawater temperature and Nutrient Availability during winter and spring. To better understand this phenomenon, we examined the combined effects of temperature (5°C, 10°C, 15°C and 20°C) and Nutrient Availability (seawater enriched with 25% Provasoli's enriched seawater vs nonenriched seawater) on photosynthesis, growth and survival and nitrogen and chlorophyll a contents of juvenile sporophytes (2–3 cm) and larger size class sporophytes (100–150 cm) from southern Hokkaido. Both juvenile sporophytes and discs from 100–150-cm-class sporophytes cultured in enriched seawater showed significantly higher growth rates and photosynthetic activities than those cultured in nonenriched seawater. This difference likely was due to the significantly higher nitrogen and chlorophyll a contents of thalli grown in enriched seawater. Significant effects of temperature on growth and photosynthesis were also...
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Open Access AJPS Combined Effects of Temperature and Nutrient Availability on Growth and Phlorotannin Concentration of the Brown Alga Sargassum patens (Fucales; Phaeophyceae)
2016Co-Authors: Hikaru Endo, Kentaro Suehiro, Junji Kinoshita, Xu Gao, Yukio AgatsumaAbstract:Copyright © 2013 Hikaru Endo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Global warming is predicted to affect plant-herbivore interactions. However, little is known about the effects of tem-perature on marine plant secondary chemistry and how these effects may impact plant-herbivore interactions. As marine macroalgae can become physiologically stressed due to warm water temperatures and Nutrient-poor conditions during summer, we conducted a culture experiment to test the combined effects of temperature (10˚C, 20˚C, 30˚C) and Nutrient Availability (seawater enriched with 25 % PESI medium and non-enriched seawater) on relative growth rate (RGR) and concentration of phlorotannins (i.e., defensive compounds) in the upper and lower parts of shoots of the brown alga Sargassum patens. RGR was affected by temperature but not by Nutrient Availability. Phlorotannnin concentration was affected by Nutrient Availability but not by temperature, although there was a significant interaction between tempera-ture and part of the shoots. Correlations between RGR and phlorotannin concentration were significant for the upper part of the shoots but not for the lower part. These correlations were slightly positive in the Nutrient-enriched medium but negative in the non-enriched medium. These results suggest that temperature affects phlorotannin concentration of S. patens indirectly via changes in the growth rate and that its effect depends on the part of the shoot and Nutrient avail
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combined effects of temperature and Nutrient Availability on growth and phlorotannin concentration of the brown alga sargassum patens fucales phaeophyceae
American Journal of Plant Sciences, 2013Co-Authors: Hikaru Endo, Kentaro Suehiro, Junji Kinoshita, Xu Gao, Yukio AgatsumaAbstract:Global warming is predicted to affect plant-herbivore interactions. However, little is known about the effects of temperature on marine plant secondary chemistry and how these effects may impact plant-herbivore interactions. As marine macroalgae can become physiologically stressed due to warm water temperatures and Nutrient-poor conditions during summer, we conducted a culture experiment to test the combined effects of temperature (10˚C, 20˚C, 30˚C) and Nutrient Availability (seawater enriched with 25% PESI medium and non-enriched seawater) on relative growth rate (RGR) and concentration of phlorotannins (i.e., defensive compounds) in the upper and lower parts of shoots of the brown alga Sargassum patens. RGR was affected by temperature but not by Nutrient Availability. Phlorotannnin concentration was affected by Nutrient Availability but not by temperature, although there was a significant interaction between temperature and part of the shoots. Correlations between RGR and phlorotannin concentration were significant for the upper part of the shoots but not for the lower part. These correlations were slightly positive in the Nutrient-enriched medium but negative in the non-enriched medium. These results suggest that temperature affects phlorotannin concentration of S. patens indirectly via changes in the growth rate and that its effect depends on the part of the shoot and Nutrient Availability.
Sune Linder - One of the best experts on this subject based on the ideXlab platform.
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growth of mature boreal norway spruce was not affected by elevated co 2 and or air temperature unless Nutrient Availability was improved
Tree Physiology, 2013Co-Authors: Bjarni D Sigurdsson, Jane Medhurst, Goran Wallin, Olafur Eggertsson, Sune LinderAbstract:The growth responses of mature Norway spruce (Picea abies (L.) Karst.) trees exposed to elevated [CO(2)] (CE; 670-700 ppm) and long-term optimized Nutrient Availability or elevated air temperature (TE; ±3.9 °C) were studied in situ in northern Sweden in two 3 year field experiments using 12 whole-tree chambers in ca. 40-year-old forest. The first experiment (Exp. I) studied the interactions between CE and Nutrient Availability and the second (Exp. II) between CE and TE. It should be noted that only air temperature was elevated in Exp. II, while soil temperature was maintained close to ambient. In Exp. I, CE significantly increased the mean annual height increment, stem volume and biomass increment during the treatment period (25, 28, and 22%, respectively) when Nutrients were supplied. There was, however, no significant positive CE effect found at the low natural Nutrient Availability. In Exp. II, which was conducted at the natural site fertility, neither CE nor TE significantly affected height or stem increment. It is concluded that the low Nutrient Availability (mainly nitrogen) in the boreal forests is likely to restrict their response to the continuous rise in [CO(2)] and/or TE.
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growth of mature boreal norway spruce was not affected by elevated co2 and or air temperature unless Nutrient Availability was improved
Tree Physiology, 2013Co-Authors: Bjarni D Sigurdsson, Jane Medhurst, Goran Wallin, Olafur Eggertsson, Sune LinderAbstract:The growth responses of mature Norway spruce (Picea abies (L.) Karst.) trees exposed to elevated [CO 2 ] (C E ; 670-700ppm) and long-term optimized Nutrient Availability or elevated air temperature (T E ; +3.9 °C) were studied in situ in northern Sweden in two 3 year field experiments using 12 whole-tree chambers in ca. 40-year-old forest. The first experiment (Exp. I) studied the interactions between C E and Nutrient Availability and the second (Exp. II) between C E and T E . It should be noted that only air temperature was elevated in Exp. II, while soil temperature was maintained close to ambient. In Exp. I, C E significantly increased the mean annual height increment, stem volume and biomass increment during the treatment period (25, 28, and 22%, respectively) when Nutrients were supplied. There was, however, no significant positive C E effect found at the low natural Nutrient Availability. In Exp. II, which was conducted at the natural site fertility, neither C E nor T E significantly affected height or stem increment. It is concluded that the low Nutrient Availability (mainly nitrogen) in the boreal forests is likely to restrict their response to the continuous rise in [CO 2 ] and/or T E .
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growth and dry matter partitioning of young populus trichocarpa in response to carbon dioxide concentration and mineral Nutrient Availability
Tree Physiology, 2001Co-Authors: Bjarni D Sigurdsson, Halldor Thorgeirsson, Sune LinderAbstract:Young individuals of a single black cottonwood (Populus trichocarpa Torr. & Gray) clone were raised for three growing seasons in whole-tree chambers and exposed to either ambient or elevated atmospheric carbon dioxide concentration ([CO2]), with either a high or a low mineral Nutrient supply, in a factorial experimental design. Nutrient Availability had a larger effect on growth and dry matter partitioning than did [CO2]. Total biomass did not differ significantly with CO2 treatment when Nutrient Availability was low. However, elevated [CO2] increased whole-plant biomass by 47% in the high Nutrient Availability treatment. Carbon dioxide enrichment reduced leaf area ratio and specific leaf area significantly, but had no significant effect on mean leaf size or leaf mass ratio. Root mass ratio was significantly increased by elevated [CO2] at low, but not at high Nutrient Availability. A modified "demographic harvesting approach" made possible the retrospective estimation of stem and branch dry masses for different years. The relative growth rates of stem and branch were significantly enhanced by elevated [CO2] with high, but not with low Nutrient Availability. Canopy productivity index (CPI), i.e., the amount of stem and branch wood produced annually per unit leaf area, was raised 12% by elevated [CO2] when Nutrient Availability was high, but was reduced when Nutrient Availability was low, because of increased below ground allocation.
Michael Obersteiner - One of the best experts on this subject based on the ideXlab platform.
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reply to uncertain effects of Nutrient Availability on global forest carbon balance and data quality and the role of Nutrients in forest carbon use efficiency
Nature Climate Change, 2015Co-Authors: Marcos Fernandezmartinez, Philippe Ciais, Yadvinder Malhi, Jordi Sardans, Ivan A. Janssens, Sara Vicca, Sebastiaan Luyssaert, Matteo Campioli, F. S. Chapin, Michael ObersteinerAbstract:Reply to 'Uncertain effects of Nutrient Availability on global forest carbon balance' and 'Data quality and the role of Nutrients in forest carbon-use efficiency'
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Nutrient Availability as the key regulator of global forest carbon balance
Nature Climate Change, 2014Co-Authors: Marcos Fernández-martínez, Philippe Ciais, Yadvinder Malhi, Jordi Sardans, Ivan A. Janssens, Sara Vicca, Sebastiaan Luyssaert, Matteo Campioli, F. S. Chapin, Michael ObersteinerAbstract:A synthesis of findings from 92 forests in different climate zones reveals that Nutrient Availability plays a crucial role in determining forest carbon balance, primarily through its influence on respiration rates. These findings challenge the validity of assumptions used in most global coupled carbon-cycle climate models.
