Influence of inorganic nitrogen cycling on the δ15N of Lake Ontario biota
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Abstract
The seasonal variability in the δ 15 N of biota at the base of the pelagic food chain in Lake Ontario was studied during the period 1995-1997. Strong seasonal patterns were observed in the δ 15 N of dissolved inorganic nitrogen, different size fractions of particulate organic matter, and zooplankton split into size fractions of 110-210, 210-295, and >295 µm. Similar patterns were reflected in the δ 15 N of individual species: Diacyclops thomasi, Bosmina longirostris, Daphnia spp., and calanoid copepods. The seasonal fluctuation of primary producers was a function of the nitrogen enrichment of dissolved inorganic nitrogen during photosynthetic uptake and the δ 15 N of NH 4 + and NO 3 - used by the algae. The large range in δ 15 N of primary producers suggests that recycling of nitrogen is an important determinant of δ 15 N at the base of the food web. The δ 15 N of individual species of zooplankton reflected the known feeding strategies and dietary preferences.
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