Spring blooms and annual cycles of phytoplankton: a unified perspective

Several hypotheses exist that describe phytoplankton spring blooms in temperate and subpolar oceans: the critical depth, shoaling mixed layer (ML), critical turbulence, onset of stratification and disturbance-recovery hypotheses. These theories appear to be mutually exclusive and none of them describe the annual cycle of phytoplankton biomass. Here, we present a model of the annual cycle in phytoplankton that recognizes that phytoplankton are not always mixed throughout the so-called ML, and that it is important to distinguish between the surface biomass and depth-integrated phytoplankton. Once these important distinctions are made, the annual cycles and blooms in surface and depth-integrated phytoplankton can be described straightforwardly in terms of the physical drivers and biotic responses.

[1]  T. Braarud,et al.  A Quantitative Study of the Phytoplankton in the Bay of Fundy and the Gulf of Maine (including Observations on Hydrography, Chemistry and Turbidity) , 1935 .

[2]  H. Sverdrup,et al.  On Conditions for the Vernal Blooming of Phytoplankton , 1953 .

[3]  T. Fenchel.  Relation between particle size selection and clearance in suspension‐feeding ciliates , 1980 .

[4]  P. Wiebe,et al.  Particulate matter production and consumption in deep mixed layers: observations in a warm-core ring , 1986 .

[5]  V. Smetácek,et al.  Spring bloom initiation and Sverdrup's critical‐depth model , 1990 .

[6]  T. Platt,et al.  Critical depth and marine primary production , 1991, Proceedings of the Royal Society of London. Series B: Biological Sciences.

[7]  M. D. Keller,et al.  Spring phytoplankton blooms in the absence of vertical water column stratification , 1992, Nature.

[8]  M. Gregg,et al.  Surface mixed and mixing layer depths , 1995 .

[9]  A. Obata,et al.  Global verification of critical depth theory for phytoplankton bloom with climatological in situ temperature and satellite ocean color data , 1996 .

[10]  Franz J. Weissing,et al.  Critical depth and critical turbulence: Two different mechanisms for the development of phytoplankton blooms , 1999 .

[11]  Trine Dale,et al.  Seasonal development of phytoplankton at a high latitude oceanic site , 1999 .

[12]  Peter A. Rochford,et al.  An optimal definition for ocean mixed layer depth , 2000 .

[13]  M. Follows,et al.  Interannual variability of phytoplankton abundances in the North Atlantic , 2001 .

[14]  D. A. Siegel,et al.  The North Atlantic Spring Phytoplankton Bloom and Sverdrup's Critical Depth Hypothesis , 2002, Science.

[15]  Jan O. Backhaus,et al.  Convection and primary production in winter , 2003 .

[16]  D. Stramski,et al.  Effects of a nonuniform vertical profile of chlorophyll concentration on remote-sensing reflectance of the ocean. , 2005, Applied optics.

[17]  M. Pinkerton,et al.  Temporal coupling between surface and deep ocean biogeochemical processes in contrasting subtropical and subantarctic water masses, southwest Pacific Ocean , 2005 .

[18]  J. Pitchford,et al.  Modelling of autumn plankton bloom dynamics , 2006 .

[19]  K. Thorisson.  How are the vertical migrations of copepods controlled , 2006 .

[20]  T. Kiørboe.  A Mechanistic Approach to Plankton Ecology , 2008 .

[21]  J. Sarmiento,et al.  Decadal variability in North Atlantic phytoplankton blooms , 2009 .

[22]  Johnathan T. Kool,et al.  An object-oriented, individual-based approach for simulating the dynamics of genes in subdivided populations , 2009, Ecol. Informatics.

[23]  M. Behrenfeld,et al.  Abandoning Sverdrup's Critical Depth Hypothesis on phytoplankton blooms. , 2010, Ecology.

[24]  Michael J. Behrenfeld,et al.  In situ evaluation of the initiation of the North Atlantic phytoplankton bloom , 2010 .

[25]  S. Chiswell,et al.  Annual cycles and spring blooms in phytoplankton: don't abandon Sverdrup completely , 2011 .

[26]  Raffaele Ferrari,et al.  Shutdown of turbulent convection as a new criterion for the onset of spring phytoplankton blooms , 2011 .

[27]  J. R. Taylor,et al.  Ocean fronts trigger high latitude phytoplankton blooms , 2011 .

[28]  Craig M. Lee,et al.  Eddy-Driven Stratification Initiates North Atlantic Spring Phytoplankton Blooms , 2012, Science.

[29]  Comment on “Annual cycles of ecological disturbance and recovery underlying the subarctic Atlantic spring plankton bloom” , 2013 .

[30]  S. Chiswell,et al.  Climatology of surface chlorophyll a, autumn-winter and spring blooms in the southwest Pacific Ocean , 2013 .

[31]  David A. Siegel,et al.  Annual cycles of ecological disturbance and recovery underlying the subarctic Atlantic spring plankton bloom , 2013 .

[32]  John S. Parslow,et al.  A model of annual plankton cycles , 2013 .

[33]  M. Behrenfeld.  Climate-mediated dance of the plankton , 2014 .

[34]  Michael A. St. John,et al.  A seasonal diary of phytoplankton in the North Atlantic , 2014, Front. Mar. Sci..

[35]  E. Brownlee,et al.  Sixty years of Sverdrup : a retrospective of progress in the study of phytoplankton blooms , 2014 .

[36]  E. Boss,et al.  Resurrecting the ecological underpinnings of ocean plankton blooms. , 2014, Annual review of marine science.

[37]  X. Xing,et al.  Seasonal variations of bio‐optical properties and their interrelationships observed by Bio‐Argo floats in the subpolar North Atlantic , 2014 .

[38]  H. Saito,et al.  Regional variability of factors controlling the onset timing and magnitude of spring algal blooms in the northwestern North Pacific , 2014 .

[39]  S. R. Brody,et al.  Changes in dominant mixing length scales as a driver of subpolar phytoplankton bloom initiation in the North Atlantic , 2014 .

[40]  André W. Visser,et al.  Synoptic-scale analysis of mechanisms driving surface chlorophyll dynamics in the North Atlantic , 2015 .

[41]  Peter Franks,et al.  Contribution to the Themed Section: ‘ Revisiting Sverdrup’s Critical Depth Hypothesis ’ Food for Thought Has Sverdrup’s critical depth hypothesis been tested? Mixed layers vs. turbulent layers , 2015 .