Light availability and temperature, not increased CO2, will structure future meadows of Posidonia oceanica

Iris E. Hendriks, Ylva S. Olsen, Carlos M. Duarte

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We evaluated the photosynthetic performance of Posidonia oceanica during short-term laboratory exposures to ambient and elevated temperatures (24–25 °C and 29–30 °C) warming and pCO2 (380, 750 and 1000 ppm pCO2) under normal and low light conditions (200 and 40 μmol photons m−2 s−1 respectively). Plant growth was measured at the low light regime and showed a negative response to warming. Light was a critical factor for photosynthetic performance, although we found no evidence of compensation of photosynthetic quantum efficiency in high light. Relative Electron Rate Transport (rETRmax) was higher in plants incubated in high light, but not affected by pCO2 or temperature. The saturation irradiance (Ik) was negatively affected by temperature. We conclude that elevated CO2 does not enhance photosynthetic activity and growth, in the short term for P. oceanica, while temperature has a direct negative effect on growth. Low light availability also negatively affected photosynthetic performance during the short experimental period examined here. Therefore increasing concentrations of CO2 may not compensate for predicted future conditions of warmer water and higher turbidity for seagrass meadows.

Original languageEnglish
Pages (from-to)32-36
Number of pages5
JournalAquatic Botany
Volume139
DOIs
Publication statusPublished - 1 Mar 2017

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light availability
meadow
meadows
temperature
warming
seagrass meadow
warm water
turbidity
irradiance
photoperiod
electrons
posidonia
Posidonia oceanica
plant growth
saturation
electron
water

Cite this

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title = "Light availability and temperature, not increased CO2, will structure future meadows of Posidonia oceanica",
abstract = "We evaluated the photosynthetic performance of Posidonia oceanica during short-term laboratory exposures to ambient and elevated temperatures (24–25 °C and 29–30 °C) warming and pCO2 (380, 750 and 1000 ppm pCO2) under normal and low light conditions (200 and 40 μmol photons m−2 s−1 respectively). Plant growth was measured at the low light regime and showed a negative response to warming. Light was a critical factor for photosynthetic performance, although we found no evidence of compensation of photosynthetic quantum efficiency in high light. Relative Electron Rate Transport (rETRmax) was higher in plants incubated in high light, but not affected by pCO2 or temperature. The saturation irradiance (Ik) was negatively affected by temperature. We conclude that elevated CO2 does not enhance photosynthetic activity and growth, in the short term for P. oceanica, while temperature has a direct negative effect on growth. Low light availability also negatively affected photosynthetic performance during the short experimental period examined here. Therefore increasing concentrations of CO2 may not compensate for predicted future conditions of warmer water and higher turbidity for seagrass meadows.",
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Light availability and temperature, not increased CO2, will structure future meadows of Posidonia oceanica. / Hendriks, Iris E.; Olsen, Ylva S.; Duarte, Carlos M.

In: Aquatic Botany, Vol. 139, 01.03.2017, p. 32-36.

Research output: Contribution to journalArticle

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