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Eisenia arborea  is the kelp species that is distributed furthest south in the northern hemisphere. Although much is known about how the giant kelp,  Macrocystis pyrifera , responds to nutrient-poor conditions, very little is known about  Eisenia , even though these two kelps share much of their habitat. The response of  E. arborea  to environmental nitrogen shortage was explored by determining short-term nitrogen uptake in the laboratory, duration of internal nitrogen reserves in nutrient-poor tanks, and recovery of reserves during weekly pulse fertilization with nitrate. Nitrate uptake was linear for at least 3 h at all concentrations and did not exhaust nitrate in the media. In both experiments in nutrient-poor outdoor tank cultures, regardless of initial tissue nitrogen concentrations, tank nitrate fell to undetectable levels after 4 weeks, and internal tissue nitrogen reserves fell to 1.0% of dry weight within 5 weeks. Low internal reserves were replenished in fertilized treatments, which had significantly greater dry weight tissue nitrogen (up to 1.3%) than thalli in non-fertilized tanks, in which algae tissue nitrogen fell to and remained constant at 1%. We conclude that the nitrogen physiology of  E. arborea  is adapted to survive a maximum of 5 weeks in the field under nutrient-poor conditions, similar to the giant kelp  M. pyrifera .

Nitrate uptake and duration of internal nitrogen reserves in the kelp Eisenia arborea