scholarly journals Responses of phytoplankton assemblages to iron availability and mixing water masses during the spring bloom in the Oyashio region, NW Pacific

2018 ◽  
Vol 64 (1) ◽  
pp. 197-216 ◽  
Author(s):  
T. Isada ◽  
A. Hattori-Saito ◽  
H. Saito ◽  
Y. Kondo ◽  
J. Nishioka ◽  
...  
Keyword(s):  
Spring Bloom ◽  
Water Masses ◽  
Iron Availability ◽  
Phytoplankton Assemblages ◽  
Oyashio Region ◽  
Mixing Water

scholarly journals Temporal patterns of phytoplankton assemblages, size spectra and diversity during the wane of a Phaeocystis globosa spring bloom in hydrologically contrasted coastal waters

2008 ◽  
Vol 88 (4) ◽  
pp. 649-662 ◽  
Author(s):  
Mathilde Schapira ◽  
Dorothee Vincent ◽  
Valerie Gentilhomme ◽  
Laurent Seuront
Keyword(s):  
Spring Bloom ◽  
Spatial Scales ◽  
Temporal Patterns ◽  
Early Summer ◽  
Water Masses ◽  
Phaeocystis Globosa ◽  
Phytoplankton Assemblages ◽  
Size Spectra ◽  
Phytoplankton Diversity ◽  
Time Dynamic

The space–time dynamic of phytoplankton diversity and succession was investigated during the wane of a Phaeocystis globosa spring bloom in four distinct hydrological sub-systems of the eastern English Channel. Nutrients, chlorophyll-a concentrations, and phytoplankton composition, standing stocks, size spectra and diversity were monitored during three key periods in 2003: late spring, early summer and summer. Two consecutive diatom assemblages were observed, respectively dominated by: (i) small colonial species (<100 μm; Melosira sp., Diploneis sp. and Navicula transitans) in April; and (ii) large fine-walled cells (>200 μm; Guinardia striata and Rhizosolenia imbricata) in May and July. This shift in diatom composition appeared to be related to the potentially limitating silicic acid in early summer. Specific phytoplankton assemblages identified in distinct water masses have evolved from a mature/senescent community towards a relatively homogeneous aestival structure of dominant species that might have been triggered by the wane of the P. globosa bloom. Our results also identified a strong heterogeneity in the distribution of secondary species between distinct water masses during the summer period, suggesting that the magnitude of the observed patterns was intrinsically related to the hydrological properties prevailing in each sub-system. The identification of distinct temporal patterns in phytoplankton species diversity and succession following the wane of a spring bloom at relatively small spatial scales (i.e. <10 km) is discussed in the framework of P. globosa blooms in particular and phytoplankton blooms in general and is suggested to have potentially strong consequences on food web dynamics and the carbon cycle in coastal ecosystems.

scholarly journals Phytoplankton temporal dynamics in the coastal waters of the north-eastern Adriatic Sea (Mediterranean Sea) from 2010 to 2017

2019 ◽  
Vol 34 ◽  
pp. 343-372 ◽  
Author(s):  
Federica Cerino ◽  
Daniela Fornasaro ◽  
Martina Kralj ◽  
Michele Giani ◽  
Marina Cabrini
Keyword(s):  
Mediterranean Sea ◽  
Seasonal Cycle ◽  
Phytoplankton Community ◽  
Spring Bloom ◽  
Temporal Dynamics ◽  
Late Winter ◽  
Research Station ◽  
Phytoplankton Assemblages ◽  
The North ◽  
Long Term Ecological Research

Phytoplankton community structure was analysed from 2010 to 2017 at C1-LTER, the coastal Long-Term Ecological Research station located in the Gulf of Trieste, which is the northernmost part of the Mediterranean Sea. Phytoplankton abundance and relevant oceanographic parameters were measured monthly in order to describe the seasonal cycle and interannual variability of the main phytoplankton taxa (diatoms, dinoflagellates, coccolithophores and flagellates) and to analyse their relationship with environmental conditions. Overall, phytoplankton abundances showed a marked seasonal cycle characterised by a bloom in spring, with the peak in May. During the summer, phytoplankton abundances gradually decreased until September, then slightly increased again in October and reached their minima in winter. In general, the phytoplankton community was dominated by flagellates (generally &lt;10 µm) and diatoms co-occurring in the spring bloom. In this period, diatoms were also represented by nano-sized species, gradually replaced by larger species in summer and autumn. Phytoplankton assemblages differed significantly between seasons (Pseudo-F = 9.59; p &lt; 0.01) and temperature and salinity were the best predictor variables explaining the distribution of the multivariate data cloud. At the interannual scale, a strong decrease of the late-winter bloom was observed in recent years with the spring bloom being the main phytoplankton increase of the year.

Primary productivity and its bio-optical modeling in the Oyashio region, NW Pacific during the spring bloom 2007

2010 ◽  
Vol 57 (17-18) ◽  
pp. 1653-1664 ◽  
Author(s):  
Tomonori Isada ◽  
Ai Hattori-Saito ◽  
Hiroaki Saito ◽  
Tsutomu Ikeda ◽  
Koji Suzuki
Keyword(s):  
Primary Productivity ◽  
Spring Bloom ◽  
Oyashio Region ◽  
Optical Modeling

Water mass distributions in the Southern Ocean derived from a parametric analysis of mixing water masses

2007 ◽  
Vol 112 (C2) ◽  
Author(s):  
Anouk de Brauwere ◽  
Stéphanie H. M. Jacquet ◽  
Fjo De Ridder ◽  
Frank Dehairs ◽  
Rik Pintelon ◽  
...  
Keyword(s):  
Southern Ocean ◽  
Parametric Analysis ◽  
Water Mass ◽  
Water Masses ◽  
Mass Distributions ◽  
Mixing Water

Temporal patterns in silica deposition among siliceous plankton during the spring bloom in the Oyashio region

2010 ◽  
Vol 57 (17-18) ◽  
pp. 1665-1670 ◽  
Author(s):  
Mutsuo Ichinomiya ◽  
Yasushi Gomi ◽  
Miwa Nakamachi ◽  
Takashi Ota ◽  
Toru Kobari
Keyword(s):  
Spring Bloom ◽  
Temporal Patterns ◽  
Silica Deposition ◽  
Oyashio Region

The water masses of the east coast of Tasmania: Seasonal and interannual variability and the influence on phytoplankton biomass and productivity

1987 ◽  
Vol 38 (5) ◽  
pp. 569 ◽  
Author(s):  
G Harris ◽  
C Nilsson ◽  
L Clementson ◽  
D Thomas
Keyword(s):  
Interannual Variability ◽  
Primary Productivity ◽  
Phytoplankton Biomass ◽  
Seasonal Cycle ◽  
East Coast ◽  
Spring Bloom ◽  
Water Masses ◽  
Seasonal And Interannual Variability ◽  
Summer Temperatures

The seasonal and interannual variability of the water masses, nutrients, phytoplankton biomass and primary productivity of the waters off the eastern coast of Tasmania are described. The seasonal and interannual variability in the water masses on the east coast could be explained by the varying influence of tropical and subantarctic waters and the presence of the northern edge of the subtropical convergence north-east from Maria Island. The physical oceanography was dominated by mesoscale events and the influence of the two parent water masses was highly episodic. Subtropical water rarely extended as far south as Tasman Island in summer and subantarctic water never extended as far north as Flinders Island. Data from satellite Advanced Very High Resolution Radiometer (AVHRR) images confirmed the hydrographic data and were used to interpret the seasonal and interannual variability. Interannual variability in maximum summer temperatures at Maria Island was correlated with the southerly extension of subtropical waters and with El Nino/Southern Oscillation events at least until the mid-1970s. There was evidence of a long-term warming at Maria Island and a cyclic fluctuation of 10-15 years in smoothed maximum summer temperatures. The decline in nitrate, and hence the phytoplankton spring bloom, occurred a month earlier inshore than offshore. Long-term data records from the inshore station at Maria Island showed strong interannual changes in the timing of the nitrate decline. The timing of the spring bloom varied from year to year by as much as 4 months. The seasonal cycle of phytoplankton biomass in 1984 and 1985 showed spring (October) and autumnal (April) blooms, with an early summer bloom in December. Low chlorophyll levels in February and March coincided with the influence of subtropical water. The seasonal cycle of phytoplankton biomass was therefore a complex function of seasonal and episodic events. Primary productivity data from the spring of 1984 showed low productivity on the west coast of Tasmania but high productivity on the east coast around Maria Island and the islands in Bass Strait.

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