NDLI: Distribution and photo-physiological condition of phytoplankton in the tropical and subtropical North Pacific

Content Provider	Springer Nature Link
Author	Fujiki, Tetsuichi Matsumoto, Kazuhiko Sai, Toshiro Wakita, Masahide Watanabe, Shuichi
Copyright Year	2012
Abstract	To better understand the vertical distribution of phytoplankton in the tropical and subtropical North Pacific, we used fast repetition rate fluorometry to investigate the photo-physiological condition of the phytoplankton assemblage in this region between February and March 2007. Along 155°E, between the equator and 24°N, the peak of fluorescence (F $_{m}$), an indication of the deep chlorophyll maximum (DCM), was deeper than the top of the nitracline and occurred at the 2.4 ± 1.3 % (mean ± SD) light depth (relative to 0 m). The photochemical efficiency (F $_{v}$/F $_{m}$) and effective absorption cross-section of photosystem II (σ$_{PSII}$) were low at the surface but increased rapidly at depths between the top of the nitracline (40–138 m) and the DCM (70–158 m), an indication that the photo-physiological condition of the phytoplankton improved below the top of the nitracline. The depth of the maximal F $_{v}$/F $_{m}$ [Z(F $_{v}$/F $_{m max}$)] was 18–32 m deeper than the DCM and corresponded to the 0.8 ± 0.2 % light depth. The values of F $_{v}$/F $_{m}$ at the Z(F $_{v}$/F $_{m max}$) were 20 % higher than those at the DCM and averaged 0.48 ± 0.01. These results suggest that the phytoplankton assemblage beneath the DCM had a high potential photosynthetic performance capacity and was growing by using the very low ambient light in this region.
Starting Page	35
Ending Page	43
Page Count	9
File Format	PDF
ISSN	09168370
Journal	Journal of Oceanography
Volume Number	69
Issue Number	1
e-ISSN	1573868X
Language	English
Publisher	Springer Japan
Publisher Date	2012-11-20
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Deep chlorophyll maximum FRR fluorometry Photo-physiology Phytoplankton Tropical and subtropical North Pacific Vertical profile Oceanography Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Oceanography

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