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Continuous photoperiod of the Artic summer stimulates the photosynthetic response of some marine macrophytes

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Continuous photoperiod of the Artic summer stimulates the photosynthetic response of some marine macrophytes. / Sanz-Martín, Marina; Hendriks, Iris E.; Carstensen, Jacob; Marbà, Núria; Krause-Jensen, Dorte; Sejr, Mikael K.; Duarte, Carlos M.

I: Aquatic Botany, Bind 158, 103126, 10.2019.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

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@article{ddb5445ae73d435d9851043f05303e33,
title = "Continuous photoperiod of the Artic summer stimulates the photosynthetic response of some marine macrophytes",
abstract = "Subarctic macrophytes are predicted to expand in the Arctic as a result of on-going global climate change. This will expose them to 24 h of light during the Arctic summer while pCO2 levels are predicted to rise globally. Here, we tested the photosynthetic activity of two brown macroalgae (Ascophyllum nodosum, Fucus vesiculosus) and one seagrass (Zostera marina) from subarctic Greenland, measuring their relative maximum electron transport rate (rETRmax), photosynthetic efficiency (α) and saturating irradiance (Ik) after 3 days of incubation at different photoperiods (12:12 h, 15:09 h, 18:06 h, 21:03 h and 24:00 h, light:dark) with ambient values of pCO2 (200 ppm, characteristic of current subarctic surface waters) and increased pCO2 (400 and 1000 ppm). The photosynthetic parameters rETRmax and Ik increased significantly with longer photoperiods and increased, however insignificantly, with increased pCO2. Responses differed between species. A. nodosum and Z. marina showed the highest increase of rETRmax and Ik from 12 h to 24 h while the increase of F. vesiculosus was smaller. Our results suggest that as subarctic macrophytes expand in the Arctic in response to retracting sea ice, the long summer days will stimulate the productivity of the species tested here, while the effect of high-CO2 environment needs further research.",
keywords = "Carbon dioxide, Continuous photoperiod, Electron transport rate, Macrophytes, Subarctic",
author = "Marina Sanz-Mart{\'i}n and Hendriks, {Iris E.} and Jacob Carstensen and N{\'u}ria Marb{\`a} and Dorte Krause-Jensen and Sejr, {Mikael K.} and Duarte, {Carlos M.}",
year = "2019",
month = oct,
doi = "10.1016/j.aquabot.2019.06.005",
language = "English",
volume = "158",
journal = "Aquatic Botany",
issn = "0304-3770",
publisher = "Elsevier BV",

}

RIS

TY - JOUR

T1 - Continuous photoperiod of the Artic summer stimulates the photosynthetic response of some marine macrophytes

AU - Sanz-Martín, Marina

AU - Hendriks, Iris E.

AU - Carstensen, Jacob

AU - Marbà, Núria

AU - Krause-Jensen, Dorte

AU - Sejr, Mikael K.

AU - Duarte, Carlos M.

PY - 2019/10

Y1 - 2019/10

N2 - Subarctic macrophytes are predicted to expand in the Arctic as a result of on-going global climate change. This will expose them to 24 h of light during the Arctic summer while pCO2 levels are predicted to rise globally. Here, we tested the photosynthetic activity of two brown macroalgae (Ascophyllum nodosum, Fucus vesiculosus) and one seagrass (Zostera marina) from subarctic Greenland, measuring their relative maximum electron transport rate (rETRmax), photosynthetic efficiency (α) and saturating irradiance (Ik) after 3 days of incubation at different photoperiods (12:12 h, 15:09 h, 18:06 h, 21:03 h and 24:00 h, light:dark) with ambient values of pCO2 (200 ppm, characteristic of current subarctic surface waters) and increased pCO2 (400 and 1000 ppm). The photosynthetic parameters rETRmax and Ik increased significantly with longer photoperiods and increased, however insignificantly, with increased pCO2. Responses differed between species. A. nodosum and Z. marina showed the highest increase of rETRmax and Ik from 12 h to 24 h while the increase of F. vesiculosus was smaller. Our results suggest that as subarctic macrophytes expand in the Arctic in response to retracting sea ice, the long summer days will stimulate the productivity of the species tested here, while the effect of high-CO2 environment needs further research.

AB - Subarctic macrophytes are predicted to expand in the Arctic as a result of on-going global climate change. This will expose them to 24 h of light during the Arctic summer while pCO2 levels are predicted to rise globally. Here, we tested the photosynthetic activity of two brown macroalgae (Ascophyllum nodosum, Fucus vesiculosus) and one seagrass (Zostera marina) from subarctic Greenland, measuring their relative maximum electron transport rate (rETRmax), photosynthetic efficiency (α) and saturating irradiance (Ik) after 3 days of incubation at different photoperiods (12:12 h, 15:09 h, 18:06 h, 21:03 h and 24:00 h, light:dark) with ambient values of pCO2 (200 ppm, characteristic of current subarctic surface waters) and increased pCO2 (400 and 1000 ppm). The photosynthetic parameters rETRmax and Ik increased significantly with longer photoperiods and increased, however insignificantly, with increased pCO2. Responses differed between species. A. nodosum and Z. marina showed the highest increase of rETRmax and Ik from 12 h to 24 h while the increase of F. vesiculosus was smaller. Our results suggest that as subarctic macrophytes expand in the Arctic in response to retracting sea ice, the long summer days will stimulate the productivity of the species tested here, while the effect of high-CO2 environment needs further research.

KW - Carbon dioxide

KW - Continuous photoperiod

KW - Electron transport rate

KW - Macrophytes

KW - Subarctic

UR - http://www.scopus.com/inward/record.url?scp=85068108653&partnerID=8YFLogxK

U2 - 10.1016/j.aquabot.2019.06.005

DO - 10.1016/j.aquabot.2019.06.005

M3 - Journal article

AN - SCOPUS:85068108653

VL - 158

JO - Aquatic Botany

JF - Aquatic Botany

SN - 0304-3770

M1 - 103126

ER -