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JPR Advance Access published online on March 24, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh066
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Received September 23, 2003;
accepted February 3, 2004

Article

Variation in temporal 14 C-plankton photosynthesis among warm-monomictic lakes of coastal British Columbia

John-Mark Davies 1*, Weston H. Nowlin 1, and Asit Mazumder 1

1 Water and Watershed Research Program, Department of Biology, University of Victoria, P.O. Box 3020 Stn CSC, Victoria British Columbia V8N 3N5, Canada

* To whom correspondence should be addressed. E-mail: jmdavies{at}uvic.ca.


  Abstract

Seasonal patterns of 14C-phytoplankton photosynthesis (PP) were examined in six warm monomictic lakes of coastal British Columbia. Four of our study lakes followed typical lake patterns with maximum PP occurring in the spring and minimal rates occurring during the winter. However, the spring maximum occurred several weeks earlier than lakes in other climatic regions. In addition, maximum rates of daily photosynthesis were observed to occur during the winter months in Maxwell Lake, rather than during the standard growing season. All study lakes except Maxwell Lake had large Daphnia in the plankton community. Maxwell was dominated by small crustacean zooplankton implying the importance of trophic-structure in mediating seasonal patterns of productivity. The four oligotrophic lakes in our study also exhibited P-deficiency during winter, as indicated by P-debt bioassays and rapid 32PO43- turnover rates. This data suggest that these coastal oligotrophic lakes were co-limited by nutrients and light during winter. The importance of winter (November-March) photosynthetic production to the total annual carbon budget in the six lakes studied here is greater than that typically reported for other temperate zone lakes. If plankton community respiration decreases more than photosynthetic production with wintertime temperatures, than more than 50% of annual net pelagic carbon fixation could occur in winter in some coastal lakes.


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