||Nutrients and microalgal biomass of the ice-water interface off Kuujjuarapik, Hudson Bay, Canadian Arctic
||Communication avec actes
||Maestrini S, Rochet M, Legendre L, Demers S
||Production et relations trophiques dans les ecosystemes marins. Yalta 27 Octobre-2 Novembre 1984
||Actes de colloques. Ifremer. Brest [ACTES COLLOQ. IFREMER.]. 1984
||Nutritive value, Growth, Food absorption, Algae, Ice water interface, Biomass, Nutrients (mineral)
|Résumé en anglais
||Nutrient analyses were done in melted ice, frazil and sea water of the upper part of the water column, where as major constitutive elements of micro-algae were analysed. Measurements of nutrient uptake were carried out with frazil algae incubated at -1.5 degree C in a field incubator. Differential-enrichment bioassays and mean N/P ratio (5.9) demonstrated that actual growth of the cultures was nutrient-limited. Nitrogen governed the algal yield when illumination and grazing allowed the microalgae to grow. It concluded that the epontic dynamics is not only controlled from above, by the seasonal (climatic) changes in light intensity as generally assumed, but also from below, by the short-term (hydrodynamic) events of vertical mixing that replenish the ice-water interface in nutrients.