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Marine Ecology Progress Series

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MEPS 175:227-239 (1998)  -  doi:10.3354/meps175227

Seasonal photoadaptation and diatom dynamics in temperate waters

Niall Broekhuizen1,*, Mark Hadfield2, Arnold H. Taylor3

1National Institute of Water & Atmospheric Research Ltd, PO Box 11-115, Gate 10, Silverdale Road, Hamilton, New Zealand
2National Institute of Water & Atmospheric Research Ltd, PO Box 14-901, 301 Evans Bay Parade, Greta Point, Wellington, New Zealand
3Plymouth Marine Laboratory, Prospect Place, West Hoe, Plymouth PL1 3DH, United Kingdom

ABSTRACT: Using a fully depth-resolved nutrient-phytoplankton model we investigate the influence that photoadaptive responses may have upon the seasonal dynamics of diatoms in the subtropical waters to the east of New Zealand. The wintertime diatom standing stocks can differ by up to 2 orders of magnitude depending upon the form of photoadaptive response assumed. As a consequence of this difference in wintertime stocks, the timing of the spring bloom varies by almost 1 mo. The spring bloom is terminated by N limitation rather than by Si limitation.

KEY WORDS: Phytoplankton · Overwintering · Modelling · Photoadaptation

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