Phytoplankton community responses to iron and CO2 enrichment in different biogeochemical regions of the Southern Ocean

被引：9

作者：

Endo, Hisashi ^{[1
,2
]}

Hattori, Hiroshi ^{[3
]}

Mishima, Tsubasa ^{[3
]}

Hashida, Gen ^{[4
]}

Sasaki, Hiroshi ^{[5
]}

Nishioka, Jun ^{[6
]}

Suzuki, Koji ^{[1
,2
]}

机构：

[1] Hokkaido Univ, Fac Environm Earth Sci, Kita Ku, North 10 West 5, Sapporo, Hokkaido 0600810, Japan

[2] Japan Sci & Technol, CREST, Kita Ku, North 10 West 5, Sapporo, Hokkaido 0600810, Japan

[3] Tokai Univ, Dept Marine Biol & Sci, Minami Ku, Sapporo, Hokkaido 0058601, Japan

[4] Natl Inst Polar Res, 10-3 Midori Cho, Tachikawa, Tokyo 1908518, Japan

[5] Ishinomaki Senshu Univ, Dept Biol Sci, Ishinomaki, Miyagi 9868580, Japan

[6] Hokkaido Univ, Inst Low Temp Sci, Pan Okhotsk Res Ctr, Kita Ku, North 19 West 8, Sapporo, Hokkaido 0600819, Japan

来源：

POLAR BIOLOGY | 2017年 / 40卷 / 11期

关键词：

Ocean acidification; Iron; Southern Ocean; Phytoplankton community composition; Diatoms; Haptophytes; MARGINAL ICE-ZONE; PHAEOCYSTIS-ANTARCTICA; PRIMARY PRODUCTIVITY; FRAGILARIOPSIS-CYLINDRUS; PHYSIOLOGICAL-RESPONSES; REDUCED CALCIFICATION; MARINE-PHYTOPLANKTON; TAXA PHOTOSYNTHESIS; PIGMENT COMPOSITION; AUSTRALIAN SECTOR;

D O I：

10.1007/s00300-017-2130-3

中图分类号：

X176 [生物多样性保护];

学科分类号：

090705 ;

摘要：

The ongoing rise in atmospheric CO2 concentration is causing rapid increases in seawater pCO(2) levels. However, little is known about the potential impacts of elevated CO2 availability on the phytoplankton assemblages in the Southern Ocean's oceanic regions. Therefore, we conducted four incubation experiments using surface seawater collected from the subantarctic zone (SAZ) and the subpolar zone (SPZ) in the Australian sector of the Southern Ocean during the austral summer of 2011-2012. For incubations, FeCl3 solutions were added to reduce iron (Fe) limitation for phytoplankton growth. Ambient and high (similar to 750 mu atm) CO2 treatments were then prepared with and without addition of CO2-saturated seawater, respectively. Non-Fe-added (control) treatments were also prepared to assess the effects of Fe enrichment (overall, control, Fe-added, and Fe-and-CO2-added treatments). In the initial samples, the dominant phytoplankton taxa shifted with latitude from haptophytes to diatoms, likely reflecting silicate availability in the water. Under Fe-enriched conditions, increased CO2 level significantly reduced the accumulation of biomarker pigments in haptophytes in the SAZ and AZ, whereas a significant decrease in diatom markers was only detected in the SAZ. The CO2-related changes in phytoplankton community composition were greater in the SAZ, most likely due to the decrease in coccolithophore biomass. Our results suggest that an increase in CO2, if it coincides with Fe enrichment, could differentially affect the phytoplankton community composition in different geographical regions of the Southern Ocean, depending on the locally dominant taxa and environmental conditions.

引用

页码：2143 / 2159

页数：17

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