Journal
BIOGEOSCIENCES
Volume 9, Issue 12, Pages 5353-5371Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/bg-9-5353-2012
Keywords
-
Categories
Funding
- Canadian Network Centres of Excellence (NCE) ArcticNet
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation
- Fonds quebecois de la recherche sur la nature et les technologies (FQRNT)
Ask authors/readers for more resources
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 (f-ratio = 0.37 +/- 0.20) during late summer and fall. Results emphasize the need to adequately consider SCM when estimating primary production and to revisit ecosystem model parameters in highly stratified Arctic waters.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available