Assessments of carbon and nitrogen (N) assimilation in Canadian Arctic waters confirmed the large contribution of subsurface chlorophyll maxima (SCM) to total water-column production from spring to late fall. Although SCM communities showed acclimation to low irradiance and greater nitrate (NO3−) availability, their productivity was generally constrained by light and temperature. During spring-early summer, most of the primary production at the SCM was sustained by NO3−, with an average f -ratio (i.e., relative contribution of NO3− uptake to total N uptake) of 0.74 ± 0.26. The seasonal decrease in NO3− availability and irradiance, coupled to the build up of ammonium (NH4+), favoured a transition toward a predominantly regenerative system © 2012 Author(s).
CITATION STYLE
Martin, J., É. Tremblay, J., & Price, N. M. (2012). Nutritive and photosynthetic ecology of subsurface chlorophyll maxima in Canadian Arctic waters. Biogeosciences, 9(12), 5353–5371. https://doi.org/10.5194/bg-9-5353-2012
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